Spatio-temporal Variations of Evapotranspiration in Anhui Province Based on MOD16 Products  

基于MOD16的安徽省蒸散时空分布特征研究（英文）

作　　者：黄飞羽 何彬方[2,3] 汪翔 黄洋[5] 

机构地区：[1]安徽省黟县气象局,安徽黟县245500 [2]安徽省气象科学研究所,安徽合肥230031 [3]安徽省大气科学卫星遥感重点实验室,安徽合肥230031 [4]安徽省蚌埠市气象局,安徽蚌埠230040 [5]安徽省安庆市气象局,安徽安庆246000

出　　处：《Agricultural Science & Technology》2017年第11期2092-2097,2105,共7页农业科学与技术（英文版）

基　　金：Supported by the Development Fund for Huai River Basin(HRM201307)~~

摘　　要：Based on the MOD16 remote sensing product provided by NASA, the temporal and spatial distribution characteristics of evapotranspiration in Anhui Province from 2000 to 2014 were analyzed statistically with the support of ENVI remote sensing image processing system and ARCGIS .geographic information system. The results showed that： （1） The annual average ET in Anhui Province was 694.9 mm from 2000 to 2014, less than half of PET, indicating that Anhui Province as a whole was in dry climate and water shortage, particularly significant in 2011-2014, with the maximum value of 730.6 mm occurring in 2003, and the minimum value of 647.6 mm occurring in 2011. The monthly average ET and PET showed a single peak distribution pattern, ET peak appearing in August, and PET peak appearing in May. （2） Linear regression analysis of ET and PET showed that there was a signif- icant decrease trend in ET in Anhui Province from October to March of the following year, and in addition, there was also a decreasing trend in the summer from June to July, but PET for the whole year demonstrated an increasing trend. The change trends of both illustrated that drought in Anhui Province was becoming more and more serious. （3） The spatial distribution of ET and PET showed that Anhui Province had obvious characteristics of high in south and low in north, and the north had large yearly and monthly changes, while the south had relatively stable changes. （4） The evapotranspiration of different land use types showed different an- nual and monthly variation characteristics, and the overall expression of annual evapotranspiration was in the order of forest 〉 grassland 〉 farmland. In terms of the monthly change, monthly evapotranspiration was manifested as winter grassland larger than the forest, forest evapotranspiration gradually exceeding the grass, and the evapotranspiration gap among the three widening continuously until the peak appearing in July or August. Due to the seasonality of crop plantation and under the common action 利用NASA提供的MOD16遥感产品,在ENVI遥感图像处理系统和ARCGIS地理信息系统支持下,统计分析了安徽省2000~2014年蒸散量时空分布特征,结果表明:(1)安徽省2000~2014年,年平均ET为694.9 mm,不足PET的一半,表明安徽省整体上处于干旱缺水状态,尤其以2011~2014年期间特别显著,其中最大值出现在2003年(为730.6 mm),最小值出现在2011年(为647.6 mm)。各月平均ET和PET均呈现单峰分布形态,ET峰值出现在8月,而PET峰值出现在5月。(2)对各月ET与PET进行线性回归分析发现,10月份至次年3月,安徽省ET呈现显著的减少趋势,除此之外,夏季的6~7月份也表现出减少趋势,而PET全年主要表现为增多趋势。两者变化趋势说明安徽省旱情越来越严重。(3)从ET与PET空间分布上看,安徽省表现出明显的南高北低的特征,并且北部年度、月度变化大,南部较稳定。(4)不同土地利用类型的蒸散量表现出不同的年、月变化特征,年蒸散强度整体表现为森林>草地>农田,月份变化上,月蒸散分布表现为,冬季草地大于森林,之后森林蒸散逐渐超越草地,并且三者蒸散差距不断扩大,直至7月或8月的峰值出现。农作物种植的季节性和温度、降水等敏感因子共同作用下,森林与草地各月蒸散表现为单峰型分布,最大值出现在7月,农田表现为双峰型分布,分别出现在5月和8月,前者强度弱于后者。

关 键 词：MOD16 EvapotranspiraUon Land Anhui Province 

分 类 号：S161.4[农业科学—农业气象学]