长江科学院院报2019，Vol.36Issue(12)：16-22,7.DOI:10.11988/ckyyb.20180970
基于MOD16的东江流域地表蒸散发时空特征分析
Spatial and Temporal Characteristics of Surface Evapotranspiration over the Dongjiang River Basin Based on MOD16
摘要
Abstract
Evapotranspiration plays a key role in maintaining the energy balance and water circulation in a basin. On the basis of MOD16 remote sensing dataset, we analyzed the temporal and spatial distribution characteristics of surface evapotranspiration in Dongjiang River Basin on inter-annual and annual scales, and researched the temporal and spatial characteristics of surface evapotranspiration of different land cover types. Results illustrated that: (1) The amount of evapotranspiration ( ET) in the midstream of Dongjiang River Basin is larger than that in the down-stream and the upstream in sequence, while the amount of potential evapotranspiration ( PET) follows the order of downstream >midstream >upstream. (2) On inter-annual (one decade) scale, ET fluctuates little, whereas PET fluctuates remarkably, both presenting rising trends after 2014. (3) On annual scale, ET displays a single peak, mounting to the top in September and concentrating in May-October, while dropping to the valley in February and remaining low from December to next February. The mean value of ET in Autumn is the largest, followed by that in Summer, Spring, and Winter in sequence. (4) In terms of land use types, the annual ET on bare land is the lar-gest, followed by cultivated field, urban area, grassland, and woodland in sequence, while PET shows an order of urban area >cultivated field >grassland >woodland >bare land. The monthly ET has a same regularity in gener-al. In winter, the coefficient of variation of ET is high and in summer is low. The coefficient of variation of ET on woodland is low and the degree of dispersion is small. The research results are of great significance for the preven-tion of drought and waterlogging in the Dongjiang River Basin.关键词
地表蒸散发/东江流域/时空特征/MOD16/ET/PETKey words
surface evapotranspiration/Dongjiang River Basin/temporal and spatial characteristics/MOD16/ET/PET分类
天文与地球科学引用本文复制引用
刘玉婷,李恒凯,王秀丽..基于MOD16的东江流域地表蒸散发时空特征分析[J].长江科学院院报,2019,36(12):16-22,7.基金项目
江西省高校人文社科课题(JC17111) （JC17111）
