Abstract
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.
Highlights
IntroductionLand use/land cover change (LUCC) is one of the core components of global change research
Publisher’s Note: MDPI stays neutralLand use/land cover change (LUCC) is one of the core components of global change research
We identified a considerably strong dependence of Fractional vegetation cover (FVC) on DMI teleconnections (Figure 9) The vegetation response lagged by five months, but the associated linear relationship was considerably weaker compared to DMI
Summary
Land use/land cover change (LUCC) is one of the core components of global change research. Land cover plays an essential role in terrestrial life support systems and serves as an important monitoring indicator to reflect the state of the regional ecological environment [1,2]. Land use is one of the direct ways human activities act on the natural environment and is the most direct and leading driving factors of land cover change throughout history [3,4]. LUCC is generally regarded as the most obvious phenomenon of global changes and will have a great effect on terrestrial ecosystems and functions in the 30 to 40 years, and closely related to the humanistic process [5]. Vegetation is considered the most important component of terrestrial ecosystems but is highly sensitive to climate change. Long-term observation of surface vegetation cover and its variation can have with regard to jurisdictional claims in published maps and institutional affiliations
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