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Macroinvertebrates are essential components of the aquatic ecosystem, and their assemblages are influenced by a variety of abiotic and biotic factors. The effects of water quality parameters on macroinvertebrate assemblages were studied in regulated and unregulated reaches of the Goulburn River, Australia. Analysis of similarities (ANOSIM) revealed significant differences in macroinvertebrate community compositions between river reaches and revealed that regulation plays a vital role in the composition of macroinvertebrates. SIMPER analysis was conducted to determine the contribution of each species to the average similarity between unregulated reach R1 and regulated reach R2, which is influenced by hydropeaking. The results show that Psephenidae, Eustheniidae, and Synthemistidae play a significant role in the observed differences between the two reaches. Redundancy analysis (RDA) and threshold indicator taxa analysis (TITAN) identified the water quality parameters and their associated indicator species, and the appropriate response threshold was determined. The results show that dissolved oxygen is the most important water quality parameter influencing macroinvertebrate community assemblage in unregulated reaches, whereas total suspended solids and ammonia nitrogen influenced community structure in regulated reaches. This research provides insight into the relative effects of water quality parameters on macroinvertebrate assemblages and their resilience to anthropogenic disturbance.

Increasing hydrological variability, accelerating population growth and urbanisation, and the resurgence of water resources development projects have all indicated increasing tension among the riparian countries of transboundary rivers. While a wide range of disciplines develop their understandings of conflict and cooperation in transboundary river basins, few process-based interdisciplinary approaches are available for investigating the mechanism of conflict and cooperation. This article aims to develop a meta-theoretical socio-hydrological framework that brings the slow and less visible societal processes into existing hydrological–economic models and enables observations of the change in the cooperation process and the societal processes underlying this change, thereby contributing to revealing the mechanism that drives conflict and cooperation. This framework can act as a “middle ground”, providing a system of constituent disciplinary theories and models for developing formal models according to a specific problem or system under investigation. Its potential applicability is demonstrated in the Nile, Lancang–Mekong, and Columbia rivers.

Human activities through changes in land and water use have led to increase in provision ecosystem services (ESs) but decrease in some regulating, supporting, and cultural services in the past thousands of years. The impact of land and water use on different types of ESs has been extensively studied, but it has not been directly linked to its societal drivers, thus failed to explain the societal root cause of ES degradation. This paper aims to examine the impacts of 3 generic societal drivers: societal value, institutional governance, and science and technology development on the evolution of ESs in the Heihe River Basin, China since 2000 years ago. Water provision, food provision, groundwater maintenance, climate regulation, and environmental flow maintenance were examined as the major ESs. Content analysis method was used to track the change of the 3 societal drivers from various textual documents. It was found that there were strong trade-off relationships between food provision and groundwater maintenance in midstream and the environmental flow maintenance services in downstream. The slow-changing and independently developed societal drivers failed to adaptively respond to the increasing food provision demands while addressing the significant decrease in groundwater and environmental flows. It is concluded that rational water (re)allocation and use are the prerequisites of balanced development of different categories of ESs and linking societal development to the benefits humans obtain from ecosystems is the prerequisite for sustainable ES management.

The stationarity of hydrological systems is dead in the era of the Anthropocene. Has our hydrological or water resources knowledge been well transformed to address this change? By using publications indexed in the Web of Science database since 1900, we aim to investigate the global development of water resources knowledge at the river basin scale with a systems approach, of which water resources knowledge development in a river basin is defined as a complex system involving the co-evolutionary dynamics of scientific disciplines and management issues. It is found that (1) legacy-driven water resources knowledge structures have consistently dominated most of the highly researched river basins in the world, while innovation-driven structures are identified in the river basins receiving increasing research publications in the recent period; (2) the management issues addressed by legacy-driven river basin studies are increasingly homogenized, while a wider range of emerging issues are considered by innovation-driven river basin studies; and (3) cross-disciplinary collaborations have remained largely unchanged and collaborations with social sciences have been very limited. It is concluded that the stationarity of water resources knowledge structure persists. A structural shift of water resources knowledge development is urgently needed to cope with the rapidly changing hydrological systems and associated management issues, and opportunities for such a shift exist in those less researched but globally distributed innovation-driven river basins.

River basin governance has become increasingly challenged in many river basins around the world. At heart is the poor understanding of governance performance and its interaction with biophysical restoration targets. This paper aims to improve the Murray-Darling Basin governance for better environmental outcomes by understanding the interactions between governance performance indicators and biophysical indicators. A diagnostic framework consisting of social indicators (Collaboration, Leadership, Institutions and Learning) and biophysical indicators (River Flows, Water Quality, Biodiversity and Species Recovery) was used to estimate condition and target for each indicator from a range of stakeholder groups representing different interests and perspectives. In addition, stakeholders also measured synergistic effects of indicator progress towards target on other indicators using strength of indicator interaction scores. A network analysis of indicator condition and interaction scores was used to determine a composite enabling pathway to suggest stakeholder contributing roles to polycentric governance. Leadership and its role in regulation, compliance and operating rules is a recurring challenge mentioned by multiple stakeholder groups, requiring clarification of roles and subsidiarity decision-making through enhanced collaboration and institutional reform. The enabling pathway proposes collaborative learning by assigning co-implementation priorities based on diagnostics rather than stakeholder specific identified key challenges. This novel approach offers a tangible way for developing sectorised stakeholder engagement strategies where participation is conceived as active collaboration towards decision-making and co-implementation.

Due to poor water resources management, groundwater-dependent agriculture induces substantial stress on several aquifer systems worldwide, which poses a serious threat to water and food security. However, only a few studies have addressed this vital issue. This study aimed to evaluate stress on aquifers due to the overuse of groundwater for food production and explore pathways for stress reduction via improved irrigation efficiency and productivity. Groundwater stress was characterized using the ratio of water use to availability, with consideration for environmental flows. The results indicated that out of 107 countries—dependent on groundwater irrigation, about half are overexploiting groundwater, while one-fifth of these countries are extracting moderately-to heavily. Over 90% of the non-renewable groundwater abstraction occurs in 7 countries. Further, about 450 million tonnes (Mt) of global annual food production is from non-renewable groundwater exploitation. If the existing irrigation efficiency is increased to 90%, current groundwater stress would be reduced by 40%. Additionally, in unstressed regions, it would be possible to produce additional 300 Mt of food by using saved water while maintaining groundwater stress at acceptable levels. Moreover, improved water productivity in conjunction with increased irrigation efficiency could reduce the current level of unsustainable food production by 47%. These results provide important insights into the dynamics of irrigation stress on groundwater systems, and the role of managerial interventions.

Water resources management and hydrological risk reduction require anticipation of emergent (unexpected or unintended) phenomena as fundamental dynamics of complex human-water systems. Explaining and characterizing these sociohydrological phenomena is a central focus of Panta Rhei–Everything Flows, the Scientific Decade of the International Association of Hydrological Sciences (2013-2022). Here we use System Dynamics’ archetypes to describe and classify socio-hydrological phenomena emerging from nonlinear interactions between human and water systems. Archetypes illustrate dynamic behaviours that are frequently observed across (seemingly) different systems, contexts or problem settings. They include intended or unintended actions and reactions with explicit recognition of delays in reaction times. Reinforcing (or positive) and balancing (or negative) feedback loops and system boundaries are key elements for describing archetypes. In the study of human-water systems, the most common archetypes are Limits to Growth, Fixes that Backfire, Success to the Successful, and Tragedy of the Commons. Using system archetypes to generalize the phenomena in coupled human-water systems allows for the comparison among case studies along with the integration of multiple dimensions, thereby contributing to the development of new theories which provide common causes and explanations. We first present several classes of sociohydrological phenomena that have been explored over the past decade, and then discuss their role in explaining the dynamics of human-water systems. Finally, we engage with the implications for integrated water resources management, hydrological risk reduction, and water governance.

Riparian countries have their respective values and priorities for water management, and their values of shared water have fundamental impacts for their propensity to be involved in cooperative management and adhere to treaties/agreements. However, there is limited understanding of the changing values and interests of each riparian country. Taking the Lancang–Mekong River basin as a case study, this paper aims to analyse the evolution of water conflict and cooperation dynamics from the perspectives of multiple countries. Newspaper articles were used as the key data source as they provide insights into events reported on by the media that are representative of each country/sector they are published within. The results depict a trend of cooperative sentiments towards water events occurring within the region. The six riparian countries (China, Myanmar, Laos, Thailand, Cambodia, and Vietnam) had a greater average sentiment score (0.5) for cooperation than international countries (0.16) for the majority of the study period. The trend also shows that countries further downstream showed lower cooperative sentiments, except for Vietnam (China 0.86, Myanmar 0.58, Laos 0.46, Thailand 0.34, Cambodia 0.13, Vietnam 0.91). Dam infrastructure was often negatively reported (60 % of negatively reported articles), which is therefore a major contributor to conflict for the Lancang–Mekong River basin. Events that are positively reported are those that aid in connecting leaders and project developers between riparian countries including meetings, bilateral and multilateral cooperation, and development projects. These findings provide the basis for further revealing the mechanism of cooperation and conflicts as well as more proactively managing cooperation and conflict in the Lancang–Mekong River basin and beyond.

Given the increasing speed and intensity of ongoing climate change and human interventions, more systematic research is needed to realize the Sustainable Development Goals in drylands. The current research status of drylands globally was reviewed together with a conceptual framework that included four key themes: (1) dryland social-ecological system dynamics and driving forces, (2) dryland social-ecological system structure and functions, (3) dryland ecosystem services and human well-being in a changing environment and society, and (4) ecosystem management and sustainable livelihoods in drylands. The themes and their linkages were then analysed to outline three research priorities under each theme. The resulting conceptual framework and research priorities were proposed as the agenda of a new scientific programme, the Global Dryland Ecosystem Programme (Global-DEP), which is intended to facilitate actionable interdisciplinary research on drylands. This framework could be useful for wider dryland research and help meet the needs of practitioners and policymakers in drylands.

The abilities of global ecosystems to produce services are declining; while the demands for these services are rapidly increasing. However, there is limited understanding of mismatches between supply and demand of ecosystem services (ESs), which has serious implications for both human wellbeing and environmental sustainability, particularly in drylands. This paper provides three perspectives: (1) an understanding of ESs in dryland catchments from a systemic process perspective; (2) an understanding of ESs in dryland catchments from a spatial management perspective; and (3) an understanding of mismatches between ecosystem service supply (ESS) and ecosystem service demand (ESD) from a long timeframe perspective. We then propose a driver-based framework for managing the mismatches between ESS and ESD. It is expected that applying these perspectives and the framework in an integrated way can assist in addressing ES mismatches to achieve ecological security and sustainable development of the socio-economy in drylands.

Advancements in technology are inextricably bound to our society and the natural environment. However, how the development process of a technology system interacts with both remains unclear. We propose a process model to understand the complex dynamics among technology, society, and the environment via seven interactive elements: technologies, actors, receiving bodies, natural contexts, social contexts, temporal–spatial contexts, and outcomes. The model was applied to agricultural and water technology development in China from 8000 bc to 1911 ad. Our findings show that these elements did not play equally important roles in different periods of the development in ancient China, with social contexts most dominating during the earlier periods and both social and environmental concerns arising towards the later periods. The proposed model, by identifying the elements in the technology development that should be strengthened, can act as an analysis device to assist in reconfiguring a more sustainable socio-technological system. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s13280-020-01424-7) contains supplementary material, which is available to authorized users.

Government interventions to manage and improve trade-offs in social and ecological systems are made through various policy instruments. The conditions of the social ecological system (SES) are a function of the cumulatively implemented policy instruments. Although both policy instruments and social ecological system frameworks have played important roles in theoretical developments in resource management, they have largely been considered in isolation from each other. By including policy instruments into the SES framework, the proposed conceptual model serves as a template to examine how governing takes place by deciphering: 1) how the biophysical system has been understood in resource governance; 2) how the social system has been set up in resource governance; and 3) how the trade-off between dynamic biophysical and social systems has been managed in the governance of SESs. This model can assist identifying any absent, overlapping or contradictory policy instruments in the governance of an SES.

Debate continues regarding which policy instrument should be used to ensure land, water, and environmental governance that promotes the sustainability of social-ecological systems (SESs). Policy instruments and Social Ecological Systems have played important roles in the theoretical development of natural resource governance systems. They, however, have been considered in isolation from one another. This study aims to bridge between the two by interpreting policy instruments as rules of interaction in a social-ecological system. Specifically, a longitudinal study on Victorian Acts was conducted to understand how policy instruments for land, water, and environmental governances adopted from 1860 to 2016 worked in the governance of SESs. Through a content analysis of the Acts, we constructed a simple typology of the ways in which policy instruments manage components of SESs. This typology includes the reserve regime, authority regime, information regime and integration regime. The study shows the circumstances under which interactions among components of biophysical and social systems deserve attention as partial shapers of policy instruments. The present work can be used to understand, examine and reflect on policy instruments currently used for resource governance and to make strategic improvements that account for current conditions rather than adopting new policies without understanding the existing context.

The APA scholarship provided by the University of Queensland for this research is gratefully acknowledged, as is funding from the Global Change Scholarship Program from the University of Queensland.

There have been increasing calls for a paradigm shift in urban water management to a water sensitive cities (WSC) approach. Although it is well recognised that development of water sensitive communities is key to sustainable urban water transitions, there is no established definition for the “water sensitive community.” This study conducts a systematic review to understand how water sensitive communities are characterised in the literature and applies a complex adaptive systems perspective to the findings. The review identifies 16 attributes that define water sensitive communities, involving elements of participation, collaboration, liveability, shared ownership and responsibility in transition processes, and resilience. We add to this by linking WSC research with complex adaptive systems theory and propose a new definition of the water sensitive community as a complex adaptive system. This presents a realistic framework in which to study the complex interactions and dynamic aspects of a water sensitive community.

Socio-hydrology has expanded and been effective in exposing the hydrological community to ideas and approaches from other scientific disciplines, and social sciences in particular. Yet it still has much to explore regarding how to capture human agency and how to combine different methods and disciplinary views from both the hydrological and the social sciences to develop knowledge. A useful starting ground is noting that the complexity of human–water relations is due to interactions not only across spatial and temporal scales but also across different organizational levels of social systems. This calls for consideration of another analytical scale, the human organizational scale, and interdisciplinarity in study methods. Based on the papers published in this journal’s Special Issue Advancing Socio-hydrology over 2019–2022, this paper illuminates how the understanding of coupled human–water systems can be strengthened by capturing the multi-level nature of human decision making and by applying an interdisciplinary multi-method approach.

Using publications in the Web of Science database (WoS), this study investigates the research collaboration on the top 95 most researched global river basins since 1900. The links of both the disciplines involved and the management issues studied between the biophysical, economic, societal, climatic and governance sub-systems of these river basins were examined. We found that research collaborations were dominated within the biophysical sub-system (65.3%) since the knowledge predevelopment period (1900–1983), with continuous increases (by 18.5%) during the rapid development (1984–2000) and the stabilisation (12.9% increase) (2001–2017). However, research collaborations related to the societal sub-system remained marginalised (varied at about 1%), while those related to the governance sub-system expanded in issues studied (32.8%) but were not supported by the core governance disciplines (3.4%). The key findings explained why global river basins are degraded from the perspective of knowledge development and they can assist the strategic planning and management of scientific research for improving governance capacity in modifying the relationship between human and nature on river basins in the Anthropocene. Tackling challenges in the Anthropocene requires transformation of the current pattern of knowledge development, a revolution in the governance of science.

Increasing hydrologic variability, accelerating population growth, and resurgence of water resources development projects have all indicated increasing tensions among the riparian countries of transboundary rivers. This article aims to review the existing knowledge on conflict and cooperation in transboundary rivers from a multidisciplinary perspective and propose a socio-hydrological framework that integrates the slow and less visible societal processes with existing hydrological-economic models, revealing the hidden feedbacks between changes in societal processes and hydrological changes. This framework contributes to understanding the mechanism that drives conflict and cooperation in transboundary river management.

The impacts of alternating dry and wet conditions on water production and carbon uptake at different scales remain unclear, which limits the integrated management of water and carbon. We quantified the response of runoff efficiency (RE) and plant water-use efficiency (PWUE) to a typical shift from dry to wet episode of 2003-2014 in Australia's Murray-Darling basin using good and specific data products for local application, including Australian Water Availability Project, Penman-Monteith-Leuning Evapotranspiration V2 product, MODIS MCD12Q1 V6 Land Cover Type and MODIS MOD17A3 V055 GPP product. The results show that there are significant power function relationships between RE and precipitation for basin and all ecosystems, while the PWUE had a negative quadratic correlation with precipitation and satisfied the significance levels of 0.05 for basin and the ecosystems except the grassland and cropland. The shrubs can achieve the best water production and carbon uptake under dry conditions, while the evergreen broadleaf trees and evergreen needleleaf trees can obtain the best water production and carbon uptake in wet conditions, respectively. These findings help integrated basin management for balancing water resource production and climate change mitigation.

Streamflow patterns support complex ecosystem functions and services. However, the direct impacts of flow regulation and climate change on patterns of streamflow are less studied. This study aims to analyse the sensitivity of streamflow patterns to the effects of flow regulation and climate change in the Goulburn-Broken catchment in Victoria, Australia. Daily streamflow was classified into low, medium, high, and overbank flow metrics using a statistical quantile-based approach. Trends and percent changes in streamflow metrics during the 1977-2018 period were analysed, and effects of change in rainfall, regulation, and flow diversion on streamflow patterns were predicted using a generalized additive model and path analysis. Low flows and medium flows increased by 26%, and high flows and overbank flows decreased by 31% during the period between 1977 and 2018. While current river regulation and flow diversion practices would dominate future change in magnitude, duration, and frequency of the streamflow, the timing of flow metrics would be dominated by variation in rainfall. These could bring a new ecological and environmental risk to the riverine ecosystem. It is recommended to increase the duration of high flows (90-120 days) and overbank flows (10-30 days) and the frequency of overbank flows to at least once every 1-2 years during wet periods to mitigate ecological and environmental risks of climate change and flow regulation in the Goulburn-Broken catchment.

Although numerous studies have investigated the individual effects of salinity, irrigation and fertilization on soil microbial communities, relatively less attention has been paid to their combined influences, especially using molecular techniques. Based on the field of orthogonal designed test and deoxyribonucleic acid sequencing technology, the effects of saline water irrigation amount, salinity level of irrigation water and nitrogen (N) fertilizer rate on soil bacterial community structure were investigated. The results showed that the irrigation amount was the most dominant factor in determining the bacterial richness and diversity, followed by the irrigation water salinity and N fertilizer rate. The values of Chao1 estimator, abundance-based coverage estimator and Shannon indices decreased with an increase in irrigation amount while increased and then decreased with an increase in irrigation water salinity and N fertilizer rate. The highest soil bacterial richness and diversity were obtained under the least irrigation amount (25 mm), medium irrigation water salinity (4.75 dS/m) and medium N fertilizer rate (350 kg/ha). However, different bacterial phyla were found to respond distinctively to these three factors: irrigation amount significantly affected the relative abundances of Proteobacteria and Chloroflexi; irrigation water salinity mostly affected the members of Actinobacteria, Gemmatimonadetes and Acidobacteria; and N fertilizer rate mainly influenced the Bacteroidetes' abundance. The results presented here revealed that the assessment of soil microbial processes under combined irrigation and fertilization treatments needed to be more careful as more variable consequences would be established by comparing with the influences based on an individual factor, such as irrigation amount or N fertilizer rate.

Many oases are experiencing severe groundwater depletion due to increased population, expanding agriculture and economic development. For sustainable development, quantifying groundwater recharge resources are fundamentally important. In this study, stable isotope techniques were employed to identify recharge sources of groundwater and quantitatively evaluate their contribution ratios in the Dunhuang Oasis, northwest China. Our findings indicate that heavy isotopes in shallow groundwater are more negative than those in deep groundwater, which is attributed to shallow groundwater that was modern and deep groundwater that was old. Irrigated return water and lateral groundwater flow from the Qilian Mountains are considered as the two main sources of shallow groundwater, accounting for 35% and 65% of the total recharge, respectively. Thus, as the main groundwater source of the Dunhuang Oasis, the Qilian Mountain Front should be protected against over-exploitation. Our results provide not only fundamental knowledge for groundwater management of aquifers of the Oasis, but also valuable water management information for other similar arid oases worldwide.

Measuring and reporting an individual’s view and practice on the Triple Bottom Line (TBL) of social equality, economic development and environmental protection for sustainable development remains c...

The characteristics of ions in irrigation water can be significantly different in response to the changes in the salinity gradient. The chemical and biological processes of soils which were irrigated with this kind of water would therefore, be remarkably influenced. Based on the field sampling data and utilizing the Structural Equation Model (SEM), this paper aims to investigate the ionic characteristics of irrigation water and evaluate their direct and indirect impacts on soil salt ions, nutrients and microbial metabolic activities. The present results demonstrated that the ionic components of irrigation water had a direct influence on the soil salt ions. In particular, the Na+ concentrations in irrigation water were not only seen to significantly increase the soil Na+ concentrations but also change the other soil ions' concentrations. The contents of soil total nitrogen (TN), available phosphorus (Pava) and available potassium (Kava) appeared to change slightly with the increase of water salinity and meanwhile, no significant impact was found from any of the ions present in the irrigation water. Although high concentrations of Na+, Cl−, SO42−, Mg2+ and Ca2+ in irrigation water significantly drove the reduction of the soil organic carbon (OC), the direct influences were actually relatively small in this respect, and it was the increase of soil salt ions that dominantly led this reduction. Irrigation water with high salinity contents could significantly restrain the soil microbial metabolic activities. In addition, high concentrations of SO42−, Mg2+, Cl−, Ca2+ and Na+ in irrigation water (accounting for about 11% of the total effects), increased concentrations of soil salt ions (i.e., 74%) and reduced contents of soil OC (i.e., 15%) all contributed to this restraint, which together were seen to affect the microbial processes under saline water irrigation. The present results revealed that the ionic effects of irrigation water on soil processes would be more complex than we currently understood, which should attract increasing concerns in the future.

Throughout history, factors closely associated with the development of human riparian civilization have undoubtedly included extreme hydrological events (floods and droughts). Few studies have been found on evaluating floods/droughts management from a perspective of long-term resilience of socio-ecological system perspective. In addition, there are increasing studies on conceptual frameworks on the resilience of social-ecological systems. However, resilience to what and how to measure it is still unclear and a continuing research topic. This paper aims to understand the impacts of floods/droughts and their management on the catchment socio-ecological system (C-SES) by developing a measurable resilience framework in which floods/droughts and their management are considered part of whole-of-system external drivers. It will be built on the theoretical development of SESs and inter-disciplinary hydrology and borrow the theory of elastic mechanics to consider the catchment as a socio-ecological system (C-SES) and analyze the floods/droughts and their management as external stress on C-SES. The framework includes five logically connected components; (1) defining a catchment as a resilient catchment social and ecological system(C-SES); (2) defining social-institutional and natural forces on the C-SES; (3) defining flood/drought disasters forces on the C-SES; (4) defining flood/drought management forces on the C-SES; and (5) defining and calculating the resilience of a C-SES to the forces defined in (2), (3) and (4), and analyzing the change in different categories of resilience with time.