Landscape ecological risk projection based on the PLUS model under the localized shared socioeconomic pathways in the Fujian Delta region

Constructing and optimizing urban ecological network in the context of rapid urbanization for improving landscape connectivity

Research on the Spatiotemporal Evolution of Land Use Landscape Pattern in a County Area Based on CA-Markov Model

Comprehensive ecological risk assessment for semi-arid basin based on conceptual model of risk response and improved TOPSIS model-a case study of Wei River Basin, China.

Assessing the dynamic landscape ecological risk and its driving forces in an island city based on optimal spatial scales: Haitan Island, China

Dynamic projection of ecological risk in the Manas River basin based on terrain gradients.

Cumulative ecohydrological response to hydrological processes in arid basins

Water use efficiency (WUE, the ratio of gross primary productivity (GPP) to evapotranspiration (ET)) reflects the coupled relationship between water loss and carbon gain in the process of plant photosynthetic carbon assimilation. As a dominant tree species in arid area, Populus euphratica plays an important ecological role in slowing desertification. Here, continuous observations of carbon, water, and energy fluxes were carried out in Populus euphratica forest with eddy covariance (EC) technique in 2018. We systematically explained the variation characteristics of energy fluxes and WUE at different time scales, and explored the main controlling factors of WUE in drought-stressed environment based on the synchronous meteorological data. Results showed that the carbon exchange of the Populus euphratica forest ecosystem occurred mainly during the growing seasons (April–October). During this period, the entire ecosystem appeared as a carbon sink with the potential to sequester atmospheric carbon dioxide. The average daily WUE was 2.2 g C/kg H2O, which was lower than other temperate forests (2.57–6.07 g C/kg H2O) but higher than grassland, wetland, and cropland. We also concluded that an increase in carbon dioxide concentration (CCO2) and air relative humidity (RH) could promote the increase of WUE. Nevertheless, WUE was negatively correlated with air temperature (Ta), photosynthetically active radiation (PAR), and normalized difference vegetation index (NDVI). Additionally, WUE increased under moderate soil water content (SWC), but decreased due to the continuously rising SWC. WUE was more strongly affected by factors affecting water consumption than carbon uptake. Under the conditions of high temperature, strong radiation and low humidity in the summer, the growth rate of ET was much larger than that of GPP. This study not only contributes to our understanding of the carbon, water, and energy dynamics of the Populus euphratica forest ecosystem but also provides an important reference for ecological conservation and ecological restoration in arid regions.

/pdf/analysis-on-water-use-efficiency-of-populus-euphratica-3y4kpbnmcu.pdf

Analysis on water use efficiency of Populus euphratica forest ecosystem in arid area

In order to improve the comprehensive management level of water resources in the Tarim river basin, a regional water ecological security early warning indicator system were established. Combining the Analytic Hierarchy Process (AHP) and the Fuzzy Comprehensive Evaluation (FCE), the complex adaptive mechanism of the water security system was integrated. The watershed overall water security belongs to safer status. Regional water security status showed a certain difference, and overall decreased gradually from west to east. Secondary indicators also different in time and space scale, and showed the geographical consistency. While Aksu and Bazhou were in a slight warning status, and regional water resources development level was moderate. Therefore, the regional economic development and water use efficiency should be enhanced to ensure water safety of the basin.

https://iopscience.iop.org/article/10.1088/1755-1315/349/1/012005/pdf

Study on early warning mechanism of ecological water safety in typical watershed of arid areas

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Papers

Dynamic projection of ecological risk in the Manas River basin based on terrain gradients.

Cumulative ecohydrological response to hydrological processes in arid basins

Analysis on water use efficiency of Populus euphratica forest ecosystem in arid area

Study on early warning mechanism of ecological water safety in typical watershed of arid areas