洞庭湖流域植被NDVI的时空变化特征及其对降水的响应  

On Spatial-Temporal Changes of NDVI and Its Relation with Precipitation in Dongting Lake Watershed

作　　者：郭晶[1] 廖梦思[1] 杨霞[1] 

机构地区：[1]湖南师范大学资源与环境科学学院,湖南长沙410081

出　　处：《衡阳师范学院学报》2014年第6期115-120,共6页Journal of Hengyang Normal University

摘　　要：利用1982—2010年洞庭湖流域GIMMS NDVI数据及30个气象站点月降水量数据,采用线性回归和Arcgis空间插值方法,研究洞庭湖流域NDVI时空分布特征,变化趋势及其与降水之间的联系。结果表明:(1)生长季多年平均NDVI值空间分布特征呈中部低,西、东和南部高的格局,NDVI和降水空间分布总体具有较大一致性,在流域北部、东部、西北部及中部呈正相关,而流域东北和中南部NDVI值的分布受降水影响较小。(2)过去29年流域NDVI呈波动性增长趋势,夏季NDVI值最大,春季值明显小于夏秋季;NDVI与降水量的同期变化相关性不显著,相关系数为-0.15,与滞后3个月的NDVI相关性最好。(3)流域NDVI变化趋势区域差异较小,整体以增长趋势为主,仅洞庭湖区附近出现降低,与降水的变化趋势分布在流域西部、北部和东北部地区存在差异。Based on GIMMS NDVI and the monthly rainfall data from 30 meteorological stations from 1982 to 2010, the Spatial- Temporal changes of NDVI and its relation with precipitation in Dongting Lake Watershed were analyzed. The results indicate： （1） The annual growing season NDVI spatial distribution is that the low valve occurred in middle part, the others are high val ue, and there is a good consistent between NDVI and precipitation in north, east, northwest and middle part, while the northeast and south-central in the basin are less effected. （2） Temporally, the annual growing season NDVI is increasing by 0.01 a year, there is an obvious seasonal variation of NDVI and a similar tendency existed in both three, but the maximal value occurred in summer; the correlation between NDVI and the corresponding rainfall data is not significant, it lags behind precipita tion about three months. （3）Regional difference： NDVI is increasing in almost the whole basin except Dongting Lake, the trends distribution are difference in west, north and northeast compare to precipitation.

关 键 词：NDVI 降水量 时空变化 洞庭湖流域 

分 类 号：P642.14[天文地球—工程地质学]