草业学报2017，Vol.26Issue(10)：10-19,10.DOI:10.11686/cyxb2017008
2006-2013年三江源草地产草量的时空动态变化及其对降水的响应
Spatial and temporal dynamics of grassland yield and its response to precipitation in the Three River Headwater Region from 2006 to 2013
摘要
Abstract
The Three River Headwater Region is one of the source areas of China's major rivers.For better grassland management under future climate change scenarios and for the sustainable development of animal husbandry in this region,it is very important to understand the spatiotemporal dynamic changes of grassland yield and the relationship between grassland yield and local precipitation.In this study,we used MODISNDVI (Moderate Resolution Imaging Spectrometer-Normalized Difference Vegetation Index) data and 442 ground sampling data from 2006 to 2013 to construct empirical models for the correlation between NDVI and the yields of three types of grasslands.Then,we used these models to estimate the distribution of grassland yield in The Three River Headwater Region during 2006-2013.We also studied the response of grassland productivity to changes in precipitation patterns in the Three River Headwater Region based on the correlation between grassland yield and annual,monthly,and cumulative precipitation.The major conclusions were as follows:(1) Grassland yield showed an increasing trend during 2006-2013 in the Three River Headwater Region,and the yield of different grassland types showed different responses to annual precipitation.(2) The most important rainfall month for grassland yield was October of the previous year;rainfall in April and May of the current year also strongly contributed to grassland yield.(3) The cumulative precipitation from October (previous year) to May in the current year was the main cause of inter-annual variations in grassland yield.(4) The cumulative precipitation in autumn of the previous year and in spring of the current year was a key factor in current-year grassland output.关键词
三江源/产草量/NDVI/时空分布/降水格局Key words
Three River Headwater/grassland yield/NDVI/spatial-temporal distribution/precipitation pattern引用本文复制引用
张雅娴,樊江文,曹巍,张海燕..2006-2013年三江源草地产草量的时空动态变化及其对降水的响应[J].草业学报,2017,26(10):10-19,10.基金项目
青海省科技支撑计划项目(2015-SF-A4-1)资助. （2015-SF-A4-1）
