2000-2020 spatiotemporal variations of different vegetation types in the Yellow River basin and influencing factors
Understanding the spatiotemporal characteristics of vegetation growth in the Yellow River basin and their influencing factors is crucial for the conservation and development of the ecology.However,existing studies rarely focus on the latest spatiotemporal characteristics of different vegetation types in the basin and their relationships with their influencing factors.Using the 2000-2020 time series remote sensing data of MODIS normalized difference vegetation index(NDVI),along with methods including trend analysis,correlation analysis,partial correlation analysis,and residual analysis,this study investigated the spatiotemporal characteristics of various vegetation types in the Yellow River basin.Accordingly,this study clarified the mechanisms behind the impacts of temperature and precipitation on annual and monthly scales and explored the influence of human activities on the spatiotemporal characteristics of different vegetation types.The results indicate that from 2000 to 2020,the NDVI of different vegetation types in the Yellow River basin trended upward overall,particularly in cultivated land and forest land.However,the increasing trends trended downward at different degrees with increasing elevation.Over the 21 years,various vegetation types were improved in most areas in the basin.However,a few areas exhibited degraded vegetation types,primarily including grassland and cultivated land.The proportion of areas with anti-continuous future trends in various vegetation types notably increased.Temperature and precipitation produced positive impacts on the growth of various vegetation types in the Yellow River basin.Nevertheless,various vegetation types exhibited greater responses to precipitation than to temperature,and the responses featured notable time lags.Furthermore,grassland and shrub growth were more sensitive to precipitation and temperature.Human activities had positive impacts on the vegetation of the Yellow River basin overall.However,some negative effects were also observed in grassland and cultivated land,warranting attention in future planning.Overall,most areas exhibited improved vegetation in the Yellow River basin in the 20 years.Given that partial grassland and cultivated land experienced degradation,it is necessary to protect typical degradation areas.The findings of this study will provide scientific data and theoretical support for ecological construction and economic development in the Yellow River basin.
vegetation typeHurst indexresidual analysisremote sensingYellow River basin
万方数据
