Spatiotemporal variation of vegetation coverage and its influencing factors in the dry-hot valley of Jinsha River during 2010-2021
Due to the influence of topography,climate and human disturbance,the dry-hot valley ecosystem of Jin-sha River is severely degraded,being a typical ecologically fragile area.With the MODIS-NDVI data during 2010-2021,we investigated the spatiotemporal variations and future trends of vegetation coverage in the dry-hot valley of the Jinsha River,as well as its relationship with climate change,human activities,and altitude factors,using trend analysis,residual analysis,and partial correlation analysis.The results showed that vegetation coverage in the study.area had generally increased with a rate of 0.0093 a-1 over the last 12 years.The area with an increasing trend in vegetation coverage was larger than that with a decreasing trend.The change types of vegetation coverage were main-ly low fluctuation,and future changes in vegetation coverage will be dominated by an upward trend.Vegetation cov-erage was weakly positively correlated with temperature and precipitation in 60.23％and 60.26％of the region,respectively,but only 3.47％and 5.08％passing the significance test.Human activities generally had positive effects on vegetation coverage.Altitude influenced vegetation coverage in the Jinsha River dry-hot valley.The pro-portion of low and medium-low vegetation coverage showed an increase-decrease-increase trend with increasing alti-tude,while the proportion of high vegetation coverage was the opposite.
vegetation coveragedry-hot valleytrend analysisdriving force
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