摘要
基于库鲁斯台草原2000~2015年MODIS时间序列数据,反演植被覆盖度及温度植被干旱指数(Temperature Vegetation Dryness Index,TVDI),并借助于趋势检验及相关性分析等方法,对库鲁斯台草原植被覆盖度时空变化及其与TVDI相关性进行了分析,结果表明:1)库鲁斯台草原植被总体属于中覆盖水平,全区中、高、低覆盖草地比例分别为49.57%、25.02%和25.41%;2)近16 a库鲁斯台草原植被覆盖度下降趋势明显,全区82.11%草地的覆盖度呈现不同程度下降,其中14.35%达到显著水平,全区62.05%区域变化率介于-0.01~0单位·a-1之间,变化率<-0.01单位·a-1的比例达20.19%;3)近16 a库鲁斯台草原90.01%区域干旱程度出现不同程度增加,对植被覆盖度的降低有较大影响,采取有效措施增加水分供给对草地植被恢复与重建具有重要意义.
Based on the MODIS time series data from 2000 to 2015,the vegetation cover and Temperature Vegetation drought Index(TVDI)of KULUSITAI Steppe were retrieved,then the spatiotemporal variations of vegetation cover and its correlation with TVDI were analyzed with the aid of trend test and correlation analysis.The results showed:1)The general vegetation cover in KULUSITAI Steppe is at the level of medium presently.The area percent of grassland of medium,high and low coverage are 49.57%,25.02%,and 25.41%respectively.2)Decrease of vegetation coverage in KULUSITAI Steppe in the last 16 years was obvious.The vegetation coverage of 82.11%area decreased to varying degrees,among them 14.35%reached significant level.The changing rate of 62.05%area was between-0.01~0 unit·a-1,the percent of area with changing rate less than-0.01 unit·a-1 also reached 20.19%.3)The degree of drought of 90.01%area in KULUSITAI Steppe increased to varying degrees in the last 16 years,which had great impact on the decrease of vegetation coverage.Taking effective measures to increase water supply is of great significance to the restoration and reconstruction of grassland vegetation.
作者
闫俊杰
崔东
夏倩倩
YAN Jun-jie;CUI Dong;XIA Qian-qian(Yili Normal University,Yining,Xinjiang 835000,China;Xinjiang Institute of Ecology and Geography,CAS,Urumqi,Xinjiang 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《伊犁师范学院学报（自然科学版）》
2018年第1期43-49,共7页
Journal of Yili Normal University：Natural Science Edition
