Response of vegetation variation to climate change and human activities in semi-arid swamps

作者：Guangyi Deng, Jin Gao, Haibo Jiang, Dehao Li, Xue Wang, Yang Wen, Sheng Lianxi, Chunguang He · 发表于：Frontiers in Plant Science · 年份：2022 · DOI：10.3389/fpls.2022.990592 · 被引用次数：22 · 研究领域：Land Use and Ecosystem Services、Remote Sensing in Agriculture、Coastal wetland ecosystem dynamics

). Global climate change, extreme droughts and floods, and large differences in evaporation and precipitation in this region can cause rapid vegetation succession. In recent years, increased grain production and river-lake connectivity projects carried out in this area to increase grain outputs and restore wetlands have caused significant changes in the hydrological and landscape patterns. Therefore, research on the response of variation trends in vegetation patterns to the main driving factors (climate change and human activities) is critical for the conservation of the Siberian Crane. Based on the Google Earth Engine (GEE) platform, we obtained and processed the Normalized difference vegetation index (NDVI) data of the study area during the peak summer vegetation period for each year from 1984 to 2020, estimated the annual vegetation cover using Maximum value composites (MVC) method and the image dichotomy method, calculated and analyzed the spatial and temporal trends of vegetation cover, explored the response of vegetation cover change in terms of climate change and human activities, and quantified the relative contribution of both. The results revealed that first, from the spatial and temporal changes, the average annual growth rate of regional vegetation was 0.002/a, and 71.14% of the study area was improved. The vegetation cover showed a trend of degradation and then recovery, in which the percentage of high vegetation cover area decreased from 51.22% (1984-2000) to 28...