The reginal vegetation activity in Ta-Pieh Mountains from 2000 to 2019 and its response to abnormal precipitation
Ta-Pieh Mountain area is one of the ecologically sensitive area in the Huai River Basin.Studying the temporal and spatial variation trend of regional scale abnormal precipitation and vegetation activities,and quantitatively identifying the response of regional vegetation activities to abnormal precipitation is of great significance for regional soil and water conservation,ecological security and sustainable development.Based on the dense time series MODIS 13Q1 remote sensing images from 2000 to 2019,firstly,the temporal change characteristics of regional vegetation activity were quantitatively retrieved by pixel dichotomy model.And then,combined with the daily precipitation data of the National Meteorological Science Data Center,using the methods of trend analysis,Mann Kendall mutation test and spatial analysis,the temporal and spatial variation trend characteristics of vegetation activities and their impact on abnormal precipitation in Ta-Pieh Mountain Area from 2000 to 2019 were explored.The results showed that:(1)From 2000 to 2019,the vegetation coverage in Ta-Pieh Mountain area generally showed a piecewise upward trend,with an overall growth rate of 0.01/10a(P<0.05,double tailed).Reginal vegetation coverage reaching the regional peak around 2011,and then entering the high-level oscillation.(2)From 2000 to 2019,the frequency of abnormal precipitation in the Ta-Pieh Mountains showed a slight downward trend;and the frequency of abnormal precipitation in the East and South was significantly higher than that in other areas.(3)From 2000 to 2019,there was a significant correlation between vegetation activity and abnormal precipitation in Ta-Pieh Mountain area,but the spatial differentiation was obvious.With the rise of altitude,the positive correlation area increased significantly.The proportion of positively correlated areas in low altitude areas(<200 m)in plains was only 25.30%,and the proportion of positively correlated areas in high altitude areas(>1000 m)could reach 54.90%.It implies that the effects of regional abnormal precipitation on the vegetation activities of different ecosystems in the Ta-Pieh Mountains are quite different.High altitude hilly forest ecosystem shows stronger resilience to abnormal precipitation,while low altitude Plain Farmland ecosystem shows more vulnerability to abnormal precipitation.
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