南水北调与水利科技2017，Vol.15Issue(1)：107-112,6.DOI:10.13476/j.cnki.nsbdqk.2017.01.018
金沙江下段植被NDVI变化趋势及其归因
Study on the relationship between change trend of NDVI and environmental factors in the lower section of Jinsha River, China
摘要
Abstract
Jinsha River is a key area for hydropower construction in China and an ecological barrier of Yangtze River.Based on the temperature and precipitation data from standard meteorological stations and MODIS data,this paper studied the spatiotemporal variation of vegetation NDVI and related influence factors in the lower section of Jinsha River through correlation analysis,spatial statistical analysis,overlay analysis,and other methods.The results showed that during a year,changes of NDVI showed a single peak,with the lowest value at 0.55 in March and the highest value at 0.75 in September.Over the 10 years,the vegetation coverage showed an overall growing trend.There was spatial heterogeneity in the NDVI growth.Below 3 850 m altitude,the vegetation NDVI generally gradually escalated with altitude,but it declined above 3 850 m altitude.During a year,the impact of precipitation on vegetation NDVI was more obvious than that of air temperature,and the NDVI change was two months behind the precipitation and temperature.Over the years,temperature had more prominent influence on vegetation NDVI than precipitation.Besides,the large-scale conversion of farmland to forest had important contribution to the increase of NDVI in the lower section of Jinsha River.关键词
植被NDVI/气温/降水/人类活动/金沙江下段Key words
tNDVI/emperature/precipitation/human activity/Jinsha River分类
社会科学引用本文复制引用
丁文荣..金沙江下段植被NDVI变化趋势及其归因[J].南水北调与水利科技,2017,15(1):107-112,6.基金项目
国家自然科学基金(41101099 （）
41261044) （）
云南省教育厅重点项目(2015Z056)National Natural Science Foundation of China (41101099 （2015Z056）
41261044) （）
Key Project of Education Department of Yunnan Province (2015Z056) （2015Z056）
