叶尔羌河流域不同植被类型归一化植被指数的变化及驱动因素  

Changes and Driving Forces of NDVI of Different Vegetation Patterns in the Yarkant River Basin

作　　者：关含笑 刘玉婷 张齐飞 庞朝悦 Guan Hanxiao;Liu Yuting;Zhang Qifei;Pang Zhaoyue(Kashi University,Kashi 844000,P.R.China;Shanxi Normal University;Kashi University)

机构地区：[1]喀什大学生命与地理科学学院、新疆帕米尔高原生物资源与生态重点实验室(喀什大学),新疆·喀什844000 [2]山西师范大学 [3]喀什大学

出　　处：《东北林业大学学报》2022年第11期30-35,42,共7页Journal of Northeast Forestry University

基　　金：新疆维吾尔自治区科技计划项目(2021D01B05);新疆维吾尔自治区高校科研计划项目(XJEDU2020Y035);喀什大学高层次人才培养项目(GCC18ZK-008);喀什大学研究生科研创新项目(KS2020009)。

摘　　要：依据过去20 a的归一化植被指数(NDVI)数据和气象资料,通过趋势分析法、重新标度极差分析法(R/S分析法)及赫斯特指数(Hurst指数)、偏相关分析法及残差分析等方法,对叶尔羌河流域不同植被类型归一化植被指数时空变化、可持续性及气候因子和人类活动对NDVI变化的影响进行分析。结果表明:(1)叶尔羌河流域植被类型主要包括森林、荒漠、草原、草甸、栽培植被以及高山植被,20 a来NDVI总体呈增长趋势,不同植被类型NDVI变化具有良好一致性。(2)不同植被类型的趋势存在一定的差异,但均以稳定和改善趋势为主。栽培植被、荒漠的改善区域面积所占比重较大,分别占67.87%和66.06%,栽培植被退化面积最大,占比为14.19%。(3)未来流域31.34%的区域NDVI变化呈可持续趋势,6种植被类型的NDVI变化均具很弱的反持续性,需精准施策,进一步加强特别是草原、荒漠等区域的生态保护力度。(4)不同植被类型NDVI和降水量的正负相关性并存,且整体上呈现出正相关关系。草原、荒漠等多种植被类型NDVI与气温、降水呈正相关关系,但与气温的相关性更强。(5)生态恢复以及治理工程的实施所产生的生态效益正在呈现(如草甸、森林等植被类型),但部分植被类型中依然存在人类活动产生消极影响的现象(如草原、荒漠等)。The spatial and temporal variation in NDVI on the Yarkant River Basin was analyzed using trend analysis,correlation analysis,R/S analysis,Hurst index,partial correlation analysis and residual analysis methods based on the MODIS normal difference vegetation index(NDVI)and meteorological data from last 20 a.The results showed that:(1)The vegetation types in the Yarkant River Basin mainly included forest,desert,grassland,meadow,cultivated vegetation and alpine vegetation,NDVI in the Yarkant River Basin was holistically improved,and all the different vegetation cover types showed good consistency.(2)The trends of different vegetation cover types showed some heterogeneity,but were mainly stable and improved.The larger improved areas of cultivated vegetation and desert accounted for 67.87%and 66.06%.The degraded areas of cultivated vegetation was the largest,accounting for 14.19%.(3)The 31.34%of the areas showed a sustainable trend.Six vegetation types showed weak reverse persistence,and precise measures should be taken to strengthen ecological protection in grassland and desert.(4)NDVI of grassland,desert and other vegetation types were positively correlated with temperature and precipitation,and temperature had more significant effect on NDVI than precipitation.(5)The ecological benefits generated by the implementation of ecological restoration and the effect of governance policies projects were emerging(meadow,forest,et al.),but some vegetation types(grassland,desert,et al.)were negatively affected by human activities.

关 键 词：叶尔羌河流域 植被类型 归一化植被指数 时空格局 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]