Subjects: Geosciences >> Geology submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
Habitat quality is an important basis for biodiversity conservation and improvement of the regional ecological environment. With an ecological civilization construction as the background, the spatial- temporal adaptation and driving mechanism of habitat quality is significant to study. Based on land use data in Shaanxi Province in 2000, 2010, and 2020, the characteristics and driving factors in the spatial-temporal adaptations of the quality of habitat in three regions were analyzed using the InVEST model, Theil index model, and geographic detector model. The results showed the following: (1) from 2000 to 2020, the average quality of habitat showed a stable and slightly increasing trend, and the spatial distribution difference was obvious, with the average habitat quality in southern Shaanxi and northern Shaanxi being higher compared to Guanzhong; (2) the difference of habitat quality among the three regions was larger in southern and central Shaanxi compared to northern Shaanxi; (3) the province and the driving factors in the three different regions, vegetation and terrain factors for the habitat quality, and land utilization factor are the main influencing factors of the three major areas affected by the spatial scale. As time goes on, the influence degree gradually strengthens, and the terrain and vegetation factors have different effects on three areas; (4) In addition to single factors, significant impacts on habitat quality changes in the three regions produced cooperative effects on socioeconomic and natural environmental factors.
Subjects: Geosciences >> Cartography submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
The study of snowline altitude changes at the end of the melting season is helpful to predict future trends of snow systems in order to understand the regional and global climate changes. The remote sensing extraction method of region snowline altitude was developed based on the Google Earth Engine and Landsat satellite data. From 1991 to 2021, the snowline altitude at the end of the melting season in the four basins of the Tianshan Mountains was extracted. The variation characteristics of snowline altitude and its relationship with meteorological factors were carefully and accurately estimated. The results were as follows: (1) the extended snowline altitude at the end of the melting season correlated well with the snow cover extent (minimum) at end of the melting season, which was extracted by Sentinel-2. The overall accuracy was 91.6%, and the Kappa coefficient was higher than 0.9. The regional snowline altitude at the end of the melting season was accurately obtained with this model. (2) Generally, the snowline altitude at the end of the melting season in the study area showed an obvious increasing trend over the last 30 years. The increase rate was between 2.7 m·a-1 and 6.4 m·a-1 . The rise rate of the snowline altitude in the Manas River Basin was the fastest (6.4 m·a-1 ), while the rise rate of the snowline altitude in the Akeyazi River Basin was the slowest (2.7 m·a-1 ). (3) The summer temperature was the main factor that affected the change in the snowline altitude at the end of the melting season in the study area (P < 0.05), while the effect of precipitation was relatively weak.
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