生态环境学报Issue(9)：1536-1543,8.
基于MOD16的陕西省蒸散量时空分布特征
Spatio-temporal Variations of Evapotranspiration in Shaanxi Province Using MOD16 Products
摘要
Abstract
Based on MOD16 dataset, annual and monthly average evapotranspiration were calculated by the tool of spatial model maker in ERDAS IMAGINE 2013, evapotranspiration of the administrative regions and landuse types for different time scales was statistically computed with the vector maps of Shaanxi Province boundary and landuse. Annual and monthly average evapotranspiration images were drew by ARCGIS 10. The time trends of evapotranspiration were analyzed by using linear regression and the significance was tested by correlation coefficient statistical test. Then the spatio-temporal variation characteristics of evapotranspiration from 2000 to 2013 in Shaanxi Province and the differences for evapotranspiration under different landuse types were analyzed. The results show that the mean annual evapotranspiration of Shaanxi Province increased slowly in the fluctuations with values ranging from 448.0 mm· a-1 to 533.3 mm· a-1, and with a mean value of 493.3 mm· a-1. The annual variation of the mean monthly evapotranspiration presented seasonal difference, the mean evapotranspiration in the period from December to April of next year showed decreasing trends, the mean evapotranspiration in the period from May to October showed increasing trends. The monthly variation of evapotranspiration within the year shows a unimodal pattern, and its peak value occurs in August, its bottom value occurs in November, it is mainly concentrated in the period from May to September. The spatial distribution of mean annual evapotranspiration from 2000 to 2013 was generally high over the south of the Shaanxi Province, but low in the north, especially in the high vegetation coverage areas. The areas with insignificant variation trends were accounted for 77.2%of the total, the pixels with significantly increased evapotranspiration were mainly distributed in north Shaanxi, Mid-Shaanxi, and hilly-mountainous areas in south Shaanxi, the pixels with significantly decreased evapotranspiration were mainly distributed in Mid-Shaanxi urban agglomeration. The spatial distribution of evapotranspiration is related to land use types, which have effect on the evapotranspiration distribution in the Shaanxi Province, and the order of evapotranspiration intensity by land cover types is woodland > grassland >farmland>desert. The research results have important significance to utilization of the limited water resources, to resolution of the shortage of water resources, and to research of monitor and early warning for drought and flood disaster.关键词
MOD16/蒸散量/时空分布/土地利用类型/陕西省Key words
MOD16/evapotranspiration/spatio-temporal variation/landuse type/Shaanxi province分类
天文与地球科学引用本文复制引用
范建忠,李登科,高茂盛..基于MOD16的陕西省蒸散量时空分布特征[J].生态环境学报,2014,(9):1536-1543,8.基金项目
陕西省科学研究发展计划项目 （）
