应用生态学报2018，Vol.29Issue(1)：75-83,9.DOI:10.13287/j.1001-9332.201801.014
2000-2015年青藏高原草地归一化植被指数对降水变化的响应
Responses of normalized difference vegetation index (NDVI) to precipitation changes on the grassland of Tibetan Plateau from 2000 to 2015
摘要
Abstract
Precipitation change is an important factor in the inter-annual variation of grassland growth on the Tibetan Plateau.The total amount,distribution pattern and concentration time are three basic characteristics of precipitation change.The temporal and spatial characteristics of precipitation change were analyzed based on climate data of 145 meteorological stations on the Tibetan Plateau and nearby areas from 2000 to 2015.The total precipitation amount was characterized by annual precipitation,distribution pattern of precipitation during the year was characterized by improved precipitation concentration index (PCI),and precipitation centroid (PC) was defined to indicate the change in precipitation concentrated time.To better illustrate the response of grassland to precipitation change,vegetation growth status was characterized by the maximum value of normalized difference vegetation index (NDVImax).Results indicated that the annual precipitation and PCI had an apparent gradient across the whole plateau and the latest PC occurred in the southern plateau.NDVImax of alpine shrub grassland was significantly correlated with the change of PCI,increased with even distribution of precipitation during growth period,and limited by the total annual precipitation.Alpine meadow did not show significantly correlations with these three indices.The inter-annual variability of NDVImax of steppe was controlled by both PCI and PC.NDVImax of alpine desert grassland was mainly controlled by annual precipitation.In addition to annual total amount of precipitation,the distribution characteristics of precipitation should be further considered when the influence of precipitation change on different types of vegetation on the Qinghai Tibet Plateau was studied.关键词
青藏高原/降水变化/降水集度/降水集中期/NDVI最大值Key words
Tibetan Plateau/precipitation change/precipitation concentration index/precipitation centroid/NDVI maximum引用本文复制引用
王志鹏,张宪洲,何永涛,李猛,石培礼,俎佳星,牛犇..2000-2015年青藏高原草地归一化植被指数对降水变化的响应[J].应用生态学报,2018,29(1):75-83,9.基金项目
本文由西藏自治区重大科技专项(Z2016C01G01/02)、国家重点研发计划项目(2016YFC0502001)和中国科学院特色研究所培育建设项目(TSYJS05)资助 This work was supported by the Major Science and Technology Project of Xizang Autonomous Region (Z2016C01G01/02),the National Key Research and Development Project(2016YFC0502001),and the Program for Developing Unique Feature Institute of the Chinese Academy of Sciences(TSYJS05). （Z2016C01G01/02）
