Search

The assessment of wetland ecosystem services value can provide theoretical basis for regional social and economic development, ecological environment protection and other planning and measures. Based on the factors of hydrology, meteorology, society, economy, resources, environment and culture, the value of wetland ecosystem services in the Yellow River Delta was evaluated by the revised equivalent factor method. The results showed that from 2005 to 2020, the area of tidal flat wetland decreased by 54.35%, and aquaculture increased by 206.91%. The total value of wetland ecosystem services increased from 28.03 billion CNY to 35.77 billion CNY, an increase of 27.63%, showing an N-shaped change of "increase - decrease - increase" on the whole. The ecosystem service value per unit area was more in coastal areas and less in inland areas. From 2005 to 2020, the ecosystem service sensitivity coefficient of the Yellow River Delta wetland was all less than 1. Under the premise of rational development and utilization, it is predicted that the value of ecological services will continue to increase in the future.

Mesoscale eddies (MEs) affect the transport and redistribution of oceanic matter and energy. The long-lived and long-distance propagation of individual eddies has garnered extensive attention; however, short-lived MEs (< 7 days) have been widely overlooked. In this study, the basic features of short-lived MEs and their spatial-temporal variations in a tropical eddy-rich region were extracted and analyzed for the first time. Short-lived cyclonic and anticyclonic eddies (CEs/AEs) were found to be widespread in two eddy belts in the tropical region of the western Pacific warm pool (WPWP). The CEs and AEs were formed by the shear instability between large-scale circulations and were distributed on both sides of the North Equatorial Countercurrent, with significant differences in spatial distribution. The variations in sea surface temperature, mixed layer depth, and surface chlorophyll-a concentration in the core of the WPWP were spatially and temporally related to the development of the two eddy belts. This new insight into short-lived MEs in the tropical region contributes to our current understanding of ocean eddies. The potential impacts of short-lived MEs on climate change, global air–sea interactions, and tropical cyclone formation should receive adequate attention and further assessment in future research.

Eco-environmental vulnerability evaluation is the main pre-technology work of regional Eco-environmental protection, pollution control, engineering construction of ecological restoration and exploitation of water resources. According to the characteristics of uncertainty and fuzziness of the Eco-environmental vulnerability evaluation index, combined with the unique ecological environment in Yunnan province, based on set pair analysis theory and entropy value method, connection degree of set pair analysis is used to describe the evaluation objects and evaluation standard of the same, different and opposite degree. A new eco-environment vulnerability evaluation model is built based on set pair analysis method, and the model is applied to eco-environment vulnerability evaluation of yunnan province. The evaluation results show that: the most area of eco-environment vulnerability evaluation belong to medium level in Yunnan province, ecol-environmental vulnerability of xishuangbanna is low, and the regional eco-environmental system structure is stable. [ABSTRACT FROM AUTHOR]