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Wildland-Urban Interface (WUI), the place where houses and vegetation meet or mix, is prone to cause fire incidents and potentially leads to huge economic loss destructive as well as negative social impacts. Due to rapid urbanization, continuous afforestation and extreme climate, the area of WUI fire outbreak is predicted to increase and might enter the period of high incidence of fires occurred in WUI around the world. China, in facing of similar forest fire risk in WUI, urgently needs more solutions to better prevent and control WUI fire. It summarized current status and previous progress of WUI fire prevention and control, listed several main characteristics of WUI, and proposed a set of overall principles and existing challenges for WUI fire under the new era in China. These efforts would provide theoretical innovation and technical support for WUI fire prevention and control in China. [ABSTRACT FROM AUTHOR]

Copyright of Acta Scientiarum Naturalium Universitatis Pekinensis is the property of Editorial Office of Acta Scientiarum Naturalium Universitatis Pekinensis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The spatiotemporal evolution of landscape patterns is the most intuitive manifestation of land-use change. Analyzing changes in watershed landscape patterns and their driving forces is of great significance for land-use management and water quality protection there. Changes in land-use, landscape fragmentation, patch shape, and diversity were analyzed using the semi-variogram and moving window methods based on the land-use data for the Yuqiao Reservoir watershed in 1990, 2000, 2010, and 2020. The driving forces of change were analyzed using Gray Correlation analysis. The results showed that urban construction land, rural settlements, and woodland increased by 588.89%, 24.19%, and 0.83%, respectively, in the Yuqiao Reservoir Watershed during the period 1990—2020 while the areas of cultivated land, grassland, and water bodies decreased by 15.14%, 5.96%, and 3.13%, respectively. Construction land increased significantly, whereas cultivated land and grassland decreased significantly from 1990 to 2010. The growth rate of construction land has slowed while that of forest land increased from 2010 to 2020. At the landscape level, the fragmentation and diversity of landscapes increased, and the landscape patch shape has become more complicated in the last 30 years. Cultivated land and grasslands were more fragmented at the class level. The patch density index（PD) and largest patch index（LPI) of urban construction land increased, while the mean patch size index（MPS) decreased acutely. The changing center of the landscape pattern surrounds the Yuqiao Reservoir and urban Zunhua. Changes in landscape patterns were closely related to social, and natural factors, such as population density, rural population, industrial enterprises, and precipitation. Urbanization and water quality protection projects at the Yuqiao Reservoir were the main forces driving changes in land-use and landscape pattern change. [ABSTRACT FROM AUTHOR]

【Objective】Land use is comprehensively affected by natural conditions and socio-economic factors, and the study of time series changes in land use is conducive to providing a scientific basis for the rational use of urban land resources.【Method】Landsat satellite remote sensing images of six periods were selected at five-year intervals for land use classification from 1995 to 2020, and the land use structure, dynamics and land use transfer in Guangzhou were analyzed. The influence intensity and interaction mechanism of various factors on land use change in different periods were discussed by using geographic detectors. 【Result】（i） Under the scenario of long time series（1995-2020） urban land use change, geodetector model could analyze the factors of urban land use change in different periods and reveal its change rules.（ii） From 1995 to 2020, the construction land in Guangzhou showed a trend of ‘stable-slow increase-sharp increase’, while the cultivated land showed a trend of ‘slow decrease-stable-substantial decrease’, and the transferred area mainly came from cultivated land and forest land. The forest land and grassland showed a monotonous decreasing trend, mainly transferred out as construction land and forest land. The water area fluctuated up and down, mainly from cultivated land. Unused land was gradually reduced, mainly converted into construction land.（iii）In different periods from 1995 to 2020, the influence of driving factors of land use change in Guangzhou was different. Among them, the influence of socioeconomic factors on land use change was higher than that of physical geography.（iv） In different periods from 1995 to 2020, the q value of the interaction factor was higher than that of the single factor q value, which showed that the interaction between the factors was two-factor enhancement. 【Conclusion】The impacts of human activities on land use change are obviously different in spatial distribution. The overlapping of multiple factors will aggravate the conflict of land use. Reducing the impact of human activities on the environment is an important way to achieve sustainable development. [ABSTRACT FROM AUTHOR]

⑴ Background——Forest city is committed to public ecological services, providing residents with greening, purification and economic value functions, solving urban environmental problems, building an ecological civilization society with harmonious development between human and nature, and enabling people to have more sense of gain and happiness, which has become a national strategy. Understanding tourists’ emotion cognition from the essence of destination image is of great significance for the expression of tourism image symbols and the construction of brand image of forest city. ⑵ Methods——This study takes Sanming City in Fujian Province as a sample forest city. First Python software was used to crawl the review data of A-level tourist attractions in Sanming City on tourism websites such as Meituan, Tongcheng, Tuniu, Lvmama, Ctrip and Qunar, and 15,887 valid comments of tourists in Sanming City from January 2012 to May 2019 were obtained. These comments covered the main tourist attractions in Sanming City. Then the SnowNLP model was used to construct the emotion language processing library and calculate the emotion index, and the Grounded Theory was used to analyze the tourists’ emotional evaluation of forest city with the image as the clue. ⑶ Results——This paper summarizes the concepts of divinity image, human image and the characteristics of tourism image of forest city, and extracts two first-level categories of divinity image of forest city, namely mountain worship（amazing mountains and forests, beautiful scenic spots） and streams and lakes attachment（abundant water resources, wonderful water landscape, beautiful water environment）,and the category of landscape society of human image（ecological atmosphere, humanistic atmosphere, complete facilities）. Based on the characteristics of tourism image, the expression mechanism of tourism image is analyzed through the emotional transformation of the forest city aesthetic image between the subjects and the objects. Through the study of tourists’ emotional identification of forest city image, the generative mechanism of “nature-symbol-landscape-image” is summarized, and the realization logic of understanding tourists’ emotion cognition of forest city from the essence of tourism image is realized. ⑷ Conclusions and Discussions——First, grasp the underlying logic of the formation of forest city tourism image according to the realistic path of tourism image expression. Sanming City should make full use of tourists’ landscape worship, explore the effect of cheering the spirit of forest city, and create a spiritual home of returning to simplicity and clarity of mind. Second, explore tourism brands based on the sentiment index and the attention to high frequency words. Sanming City should strive to excavate the tourism brand of “streams and lakes attachment”, and focus on reflecting the divinity image and tourism publicity of “mainly streams and lakes attachment, supplemented by mountains and forests worship” in tourism marketing design. Third, spread the divinity image of the forest city through various channels. First of all, Sanming City should choose authoritative media to publicize the popularity of forest city, such as publicizing the divine tourism image of streams and lakes, mountains and forests on CCTV to show the new image of eco-tourism. Secondly, it is necessary to create the divinity image by holding large-scale festivals, competitions, forums and other ways. For example, in the Cross-Strait（Sanming） Forestry Expo, the divine tourism image of Sanming forest city is highlighted to create a strong forest tourism atmosphere. Finally, Sanming City should spread the divinity image of forest city in we-media channels such as WeChat, TikTok and Xiaohongshu, and present the new atmosphere of forest tourism in Sanming City. Fourth, improve the forest cities’ tourism infrastructures and enhance their service quality. Sanming City should take into account all aspects of tourism needs of tourists to ensure high-quality tourism services. In addition, ticket prices should be appropriately controlled. [ABSTRACT FROM AUTHOR]

Forest biomass is an important influencing factor in the study of global environmental and climate change, and plays an important role in the study of the carbon cycle. It is important to estimate forest biomass in a region quickly and accurately. In order to explore the biomass research method at the single-wood scale in the urban forestry demonstration base of Northeast Forestry University (NEFU), the biomass estimation model of the same tree species in the target sample site was obtained, and the above-ground biomass of the target tree species was obtained. In this paper, the Unmanned Aerial Vehicle (UAV) was used to acquire remote sensing images of Pinus sylvestris var. mongolica in the modeling and validation sample plots in the urban forestry demonstration base of NEFU. The UAV remote sensing images were pre-processed and the diameter at breast height (DBH) of all Pinus sylvestris var. mongolica in the modeling and validation plots (Plot1 and Plot2) was measured. The images were segmented and crown information was extracted. The eCognition software was used to extract the information from the remote sensing images and to automatically segment and classify the single tree crowns. The information was imported into ArcGIS software and the crown area of all the Pinus sylvestris var. mongolica was counted. The above-ground biomass of Pinus sylvestris var. mongolica in the sample plots was estimated. Combined with the measured DBH data, the model was fitted to the Pinus sylvestris var. mongolica data in the sample plots, and an optimal model of crown areaDBH was fitted. With the help of the empirical model of DBH - biomass, the above-ground biomass of Pinus sylvestris var. mongolica was derived. The results showed that the above-ground biomass of Pinus sylvestris var. mongolica in the target sample plots can be effectively estimated by using UAV remote sensing technology and the fitted optimal model. The total biomass of the modeling plot1 was 6 315 kg and the validation plot2 was 5 802 kg. [ABSTRACT FROM AUTHOR]

Background--Fujian is a region with the richest forest resources and the most developed forest culture in China. In the new era of ecological civilization, it is of great significance to deeply excavate and systematically sort out the evolution skeleton of forest culture in Fujian Province and summarize its experience, lessons and development rules to promote Fujian's ecological civilization construction and Rural Revitalization Strategy and play an exemplary role in China. Methods--First, collect archaeological historical materials, local chronicles, forestry history, periodicals and documents related to Fujian forest culture. Then, in March 2019 and September 2020, I went to Wuyishan, Jianou, Shunchang, Yanping, Fuzhou, Pucheng, Youxi, Dehua, Putian, Zhangzhou and other places in Fujian to conduct on-the-spot inspections, and communicated with local forestry cadres and workers, some Forest farmers and technicians conduct interviews to learn more about forestry heritage and forest culture. Finally, on the basis of collecting historical data, typical survey data, and synthesizing existing research results, starting from exploring the changes of Fujian's forest culture, forestry heritage resources and forestry development process, systematically sort out the evolution context of the forest culture of Fujian Province in different historical periods. (3) Results--The development stages of forest culture in Fujian Province are as follows: the primitive utilization of forests and the Immortal-Taoism culture in the pre-Qin period, the artificial forests and Zen tea culture from the Qin and Han dynasties to the Sui and Tang Dynasties, the mountain farming culture, the modern wood industry culture and the modern Lin family culture in the Song, Yuan, Ming and Qing dynasties. The culture of forest cutting, utilization and nature worship was formed in the pre-Qin period. Before the Tang Dynasty, bamboo culture and tea culture were formed. From the Song Dynasty to the early Qing Dynasty, litchi culture and cunninghamia culture were formed. In modern times, it was mainly the introduction of western forestry science and technology and the rise of forestry education. At present, forest protection and cultivation, forest property rights reform, forest science and technology education, urban forestry, forest tourism, etc. develop greatly and rapidly. Generally speaking, forest cultural resources and assets are the precious wealth accumulated by the dual effects of long-term evolution of nature and historical creation of human beings. They are not only the display of forest biodiversity, but also the witness of human history and the embodiment of human cultural diversity. Conclusions and Discussions--During the development of forest culture in Fujian Province for more than 5000 years, Fujian carried on the bold exploration and unremitting practice and carried out the forest utilization, afforestation and forest products development, thus a series of important achievements are made in the forest property rights reform and forestry system culture construction, precious and rich historical experience is accumulated, and it becomes a model of forest culture construction in China. First, "human and forest coexist". The development experience of forest culture in Fujian province shows that human and forest are interdependent, symbiotic and co-prosperous. Second, "wisdom is accumulated in ancient and modern times". The achievements of forest culture in Fujian province are made by Fujian people in the process of gradual accumulation and continuous innovation in the forestry production practice for thousands of years. Third, "focus on forest property rights reform". Only by constantly innovating systems and mechanisms, releasing the vitality of market economy and market elements, can we mobilize people's enthusiasm to protect and develop forests and bring benefits to the society. Fourth, "insist on cultivating people with culture". In order to realize the sustainable development of society, we must pay attention to the innovation of forest theory, develop forestry education, advocate opening up and communication, and firmly establish the values of ecological civilization. [ABSTRACT FROM AUTHOR]

[Objective] The variation characteristics of air negative ions (NAI) and atmospheric pollutant concentration as well as their correlation were analyzed to study their influencing factors, and verify the atmospheric purification function of air negative ions in urban forests.[Method] On the basis of NAI and air pollutants concentration data monitored for a long time by Beijing Xishan National Forest Park, Origin software was used to draw the daily variation characteristic chart and SPSS software respectively to analyze the correlation between them. Then, the correlation between NAI and different air pollutant levels was analyzed according to Environmental Air Quality Standard (GB3095—2012). [Result] Urban forest NAI concentration was negatively correlated with PM2.5,NO2 and O3, NAI concentration was mainly affected by NO2. Regardless of the level of PM2.5 concentration, NAI could make feedback to the change of PM2.5 concentration sensitively. NAI had certain bearing capacity for NO2, when concentration of NO2 was lower than 40 μg/m³, NAI concentration ranges between 2000 and 2800 ion/cm3.When O3 concentration was lower than 50 μg/m³, NAI concentration was positively correlated with O3; When O3 concentration was greater than 50 μg/m³, NAI concentration was negatively correlated with O3. [Conclusion] The concentration of atmospheric pollutants at monitoring points is generally low, indicating that the degree of air pollution in urban forests is low, and the NAI released in forests can make feedback to the increased concentration of pollutants sensitively, further verifying that urban forests have certain resistance to the impact of urbanization. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】 In order to solve the contradiction of water consume between urban gardens and social life, the establishment of water-saving lawns has become the main direction of urban green space development.【Method】‘Houndog Ⅴ’ and‘Jaguar IVG’ were used as experimental materials in the present study, and they were cultured under four different water supply conditions: 15 %-20 %, 20 %-25 %, 25 %-30 %, and 30 %-40 %. The contents of proline(Pro), malondialdehyde(MDA), chlorophyll(Chl) and(P_n) Net Photosynthetic rate,(T_r) Transpiration, and(G_s)Stomatal Conductance have been measured.【Result】The growth of water conditions on the ‘Houndog Ⅴ’ of the lower limit was 25 %-30 %(moderate irrigation), and the ‘Jaguar IVG’ growth of water conditions limit was 20 %-25 %(mild irrigation).【Conclusion】With better lawn water-saving potential, the demand of Festuca arundinacea Schreb ‘Jaguar IVG’ for water was lower than that of the Festuca arundinacea Schreb P ‘Houndog Ⅴ’. Under the 20 %-25 %(mild irrigation) water conditions, the ‘Houndog Ⅴ’ meets the needs of lower quality lawn green landscape. The Festuca arundinacea Schreb ‘Jaguar IVG’ landscape effects and the ability to maintain the green period are more stable. [ABSTRACT FROM AUTHOR]

[Objective] Urban forests can reduce the concentration of atmospheric particulate matter in many ways, which is of great significance to the improvement of urban environmental air quality. [Method] This article is based on the real-time monitoring data of atmospheric particulate matter at different monitoring points inside and outside the Yaner's Nest Ecological Forest in the southern suburbs of Urumqi, The ability of urban forests to reduce particulate matter was analyzed. [Results] ① The seasonal variation trends of the three types of atmospheric particulate matter (PMi0, PM2.5, PM1.0) are relatively consistent, all of which are winter>autumn>spring>summer, and summer and autumn. The concentration of atmospheric particulate matter outside the urban forest is higher than that in the ecological forest, and a "dome area" with a higher concentration of particulate matter will be formed in the center of the forest in winter and spring; ②The reduction effect of urban forest on atmospheric particulate matter in summer and autumn is positive, And the reduction of atmospheric particulate matter in winter and spring is negative, indicating that the reduction effect of summer and autumn on particulate matter is greater than that in winter and spring; ③Rain weather will affect the accumulation of particulate matter in the atmosphere. Although the level is lower and can last for a certain period of time, although it gradually increases 3 days after the rain, it is still lower than the concentration of the day before the rain. [Conclusion] Different seasons, ecological forests have different reduction efficiencies in reducing the concentration of particles of different sizes, and rainfall can interrupt the ecological forest. The enrichment process of atmospheric particulate matter can effectively reduce the concentration of atmospheric particulate matter in the air. [ABSTRACT FROM AUTHOR]

Due to the climate change and human activities, the global ecosystem has changed significantly, which leads to the continuous decline of ecosystem resilience at the regional and even global scale and constrains the sustainable development of ecosystems. The question about how to maintain the sustainable development ability of ecosystem and reduce the influence of uncertainties has attracted extensive attention of scholars at home and abroad. A theory based on ecosystem resilience has provided a framework for solving these problems, but at present, the research of resilience is in the initial stage. Based on this, this paper takes the documents in CNKI database and Web of science database as samples. In CNKI database, the subject is “ecosystem resilience”, and in Web of science core database, the topic is “resilience” & “ecological system” or “marine ecological resilience” or “wetland ecological resilience” or “forest ecological resilience” or “grassland ecological resilience” or “desert ecological resilience” not “social-ecological system” not “urban system” not “community system”. The Histcite citation visualization software is used to select 40 papers with the highest local citation score (LCS), generating citation chronicles of foreign ecosystem resilience literature, with a time span of 1990-2019, so as to analyze the development of resilience research in foreign countries. In the analysis of domestic research hotspot trends, it is mainly to analyze the quantity of keywords appearing at different stages, and to study the evolution of resilience content. At the same time, this paper also uses VOSviewer data processing software to perform co-occurrence and cluster analysis on keywords, and generates a network map of keywords co-occurrence relationship to understand the main research direction of ecosystem resilience at home and abroad. The findings are as follows: 1) On the whole, the research on ecosystem resilience at home and abroad is on the rise in quantity, and the documents are mainly from the United States. The journals published in the field of ecosystem resilience research at home and abroad tend to focus on ecology and resources. Research institutions include comprehensive colleges, and the universities of mining, teacher education, academy of sciences, and some administrative institutions. 2) At the international level, the focus is different at different stages. Judging from the emergent words, the early stage focuses on biodiversity protection and ecosystem stability. After 2010, more attention is paid to the research of practical policies on the resilience of specific ecosystems. According to the results of citation analysis, resilience is researched from theoretical discussion to specific case modeling, and the research object extends from marine ecosystem to forest ecosystem. The results of co-occurrence analysis and cluster analysis of key words show that the research topics of international resilience focus on biodiversity, basic theory, policy management and the stability of marine ecosystem (especially coral reef). 3) Compared with other countries, China's resilience research starts late, and the research direction of ecosystem resilience in China mainly includes three aspects: land reclamation, land investigation and monitoring means, and research on influencing factors. In recent years, social ecosystem resilience, and sustainability and stability of ecosystem have become research hotspots. [ABSTRACT FROM AUTHOR]

Copyright of Research of Environmental Sciences is the property of Research of Environmental Sciences Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Urban forest is one of the most important ecological development in the urban area of a city. Taking the urban forest in central Beijing as research object, we divided it into four types of urban forest according to its ecological service function, including subordinated landscaping forest, road river shelter forest, city park leisure forest and suburban recreation forest. Extracting four types of urban forest using object oriented method and transformed into thematic maps based on GF-2 high-resolution images on September 16, 2016. Then we analyzed the number of patches, patch constitution, fragmentation index, Simpson's diversity index, Simpson's dominance index and aggregation index with Fragstats 4.2 software. The results suggested superiority of high resolution remote sensing data, about 32.35% area of central Beijing were covered by urban forests total area being 22 514.79 hm2, about 13.62% of all patches were large patches with area being 73.20%. Unbalanced and irrational distribution on different positions and rings, subordinated forest and road river shelter forest were the dominant landscapes, however, with high fragmented landscape and low aggregation index, the other two kinds of landscapes took small proportion, especially poor in South Beijing. Besides the fragmentation level reduces from the second ring road to the fifth ring road, with the highest fragmentation pattern in the second ring about 183.50. Based on these results, suggestions are promoted as follows, making full use of small patches and build pocket park, strengthening the construction of road river shelter forest in order to connect city park forest and suburban recreation forest, increasing urban forest coverage within the third ring road and improving the quality of urban forest outside the third ring road. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Wetland is one of the three major ecosystems of the Earth, which plays an important role in climate regulation, water supply and environmental purification. Based on the land ecological remote sensing interpretation data and socio-economic data from 1990 to 2015, this research quantitatively studied the change of ecosystem service value of different wetland types and different functions in the Beijing- Tianjin- Hebei (Jing- Jin- Ji) Urban Agglomeration and each city by modifying the ecosystem service equivalent value, and the wetland function was orientated by calculating the internal and external contribution rates of the wetland value. The results showed that: (1) The ecosystem service value of wetland in Jing- Jin- Ji Urban Agglomeration showed a trend of rising first and then wavily descending. The wetland value in 2015 increased by 2.93×109 yuan compared with 1990, mainly due to the increase of the value of river canals, reservoirs and ponds, as well as the increase of hydrological regulation value and water supply value. (2) Among the 13 cities in the Jing- Jin- Ji Urban Agglomeration, Tianjin had the highest ecosystem services value, and wetland value in the eastern coastal regions had increased. Inland cities in the south not only had a small wetland area, but their value had also declined year by year. (3) Hydrological regulation, water supply and environmental purification were the dominant functions of most urban wetlands in the urban agglomeration, while river canals, reservoirs and flood land were the main types of wetlands that provided service functions. The reduction and increase of ecosystem services value were closely related to human activities. Therefore, understanding the changing trend of wetland value and clarifying the functional orientation of wetland can not only enhance people's awareness of wetland ecological protection, but also provide scientific basis for the protection, restoration and sustainable use of wetland in the Jing-Jin-Ji Urban Agglomeration in the future. [ABSTRACT FROM AUTHOR]

According to the design scheme of natural resource balance sheet proposed by the author in previous study, this paper takes Zhuxi County, Shiyan City, Hubei Province as a case study and compiles the substance accounting table and value accounting table of Zhuxi County respectively by using statistic methods, market price law, alternative market law, willingness assessment law, etc., and the relationship between the changes of natural resources and regional economic development are analyzed. The results are as follows: 1) The total amount of forest and characteristic resources in Zhuxi County is increasing year by year. The industrial water consumption is decreasing year by year. The efficiency of industrial water is increasing continuously, while the resident living water keeps at a consant level. The water usage for urban public and ecological environment is increasing annually and the trend of agricultural water consumption remains constant. Water consumption is mainly affected by precipitation and other natural conditions. In the future, developing modern agriculture and improving agricultural water efficiency are necessary. In addition, land resources are in the trend of converting to construction land. The government of Zhuxi County should control construction area in a reasonable range. 2) The value of natural resources is in a relatively stable state which shows the natural resources are not over-consumed, and the value of land resources is the highest. The influence of human factors on the value of forest resources is positive and the total value is increasing. The influence of human factors on the value of water resources is negative. 3) With the increase of GDP in Zhuxi County, the total amount of natural resources has not reduced and remains relatively stable. The effect of human factors on the total value of natural resources is positive. [ABSTRACT FROM AUTHOR]