Long Term Observation of Fractional Vegetation Cover in Qingyang of Gansu Province and Its Response to Climate Change

被引:5
|
作者
Li, Jing [1 ,2 ,3 ]
Zhang, Jianyun [1 ,2 ,3 ]
Wang, Xiaojun [1 ,2 ,3 ]
Wang, Guoqing [1 ,2 ,3 ]
机构
[1] Nanjing Hydraul Res Inst, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210029, Peoples R China
[2] Yangtze Inst Conservat & Dev, Nanjing 210098, Peoples R China
[3] Minist Water Resources, Res Ctr Climate Change, Nanjing 210029, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
vegetation; climate change; human impact; Qingyang; ECOSYSTEM SERVICES; LAND DEGRADATION; TIME-SERIES; MODIS DATA; CHINA; VARIABILITY; RESTORATION; DYNAMICS; PRODUCT; SEAWIFS;
D O I
10.3390/atmos13020288
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Vegetation is seen as a sensitive indicator of global change because of its crucial role in connecting the atmosphere, soil, and water. Fractional vegetation cover (FVC), in turn, is an important indicator of vegetation status. Qingyang is a typically ecologically sensitive region, with a range of changes in vegetation in the last decade as a result of climatic and non-climatic factors. However, the exact impact of climate change and human activities remains unclear. Satellite observations can help to clarify that impact, allowing us to assess trends in vegetation change in the last two decades (2000-2019). In this study, daily and composite time series vegetation variations were derived from moderate resolution imaging spectroradiometer (MODIS) data and the impact of climate and human activity factors was examined for different administrative districts. By deploying multiple regression models, the research revealed that human activity has contributed 46% to the FVC variation, while the remaining 54% was led by climate factors. In areas where FVC was increasing, human activity contributed 55.89% while climate factors contributed 44.11%. In areas where FVC was decreasing, human activity and climate factors contributed 24.58% and 75.42%, respectively. The study also looks at the impacts of El Nino/IOD events in FVC dynamics in the study site. The FVC inversion result from MODIS proved capable of capturing long-term and seasonal vegetation patterns and thus provide a valuable archive for decadal-scale vegetation dynamics in the study area. Moreover, the improvement in FVC was a dual effect of climatic and human activities, while the latter owns a higher contribution especially for the implementation of ecological construction projects.
引用
收藏
页数:19
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