Evapotranspiration Evolution and Ecological Water Requirement Law in Agro-pastoral Ecotone Based on SEBAL Model

doi:10.13961/j.cnki.stbctb.2019.04.028

Home > Archive>Volume 39, Issue 4, 2019 >177-183. DOI:10.13961/j.cnki.stbctb.2019.04.028

Evapotranspiration Evolution and Ecological Water Requirement Law in Agro-pastoral Ecotone Based on SEBAL Model
DOI:
                        10.13961/j.cnki.stbctb.2019.04.028
                    
Author:
                        Ma LonglongMa Longlong
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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Du LingtongDu Lingtong
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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Gong FeiGong Fei
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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DAN YangDAN Yang
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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Wang LeWang Le
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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Zheng QiqiZheng Qiqi
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China;School of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China
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Meng ChenMeng Chen
Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
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Abstract:

[Objective] The evapotranspiration pattern, evolvement characteristics and water demand laws of ecosystem in typical agro-pastoral areas were studied to provide scientific basis for regional ecological management and water resources management.[Methods] Yanchi County of Ningxia Hui Autonomous Region was taken as an example, four-phase of Landsat remote sensing data and meteorological data from 2000 to 2017 were selected, and the daily evapotranspiration in different periods of the county was retrieved by using the SEBAL model, and the land use type data was analyzed and studied in the same period.[Results] ① The daily evapotranspiration at the beginning of the fall increased from 0.89 mm/d in 2000 to 1.71 mm/d in 2017, with an increase of 92.1%, designating that it had an increasing trend. ② There was a strong spatial heterogeneity in the daily evapotranspiration, and it was generally high in the south and low in the north, especially in the southeast loess hilly region, it was the highest. The annual growth rate of the past 17 years' evapotranspiration showed a characteristic of high in the south and low in the north, but there were large differences in the spatial pattern of annual increase in different periods. ③ There were differences in the evapotranspiration of different types of land. The average evapotranspirations of arable land, woodland and grassland were 1.42, 1.33, and 1.27 mm/d, respectively, but the largest annual increase in evapotranspiration was grassland. ④ The total amount of ecological water demand in Yanchi County and the amount of ecological water demand in various areas were increasing. The order of ecological water demand from high to low is grassland, arable land and woodland. However, the per unit ecological water requirement was the highest for arable land, and the smallest was of grassland. The shares of ecological water requirements of arable land and forest land in the total ecological water needs in the past 17 years was declining, while the proportion of grassland ecological water needs was on the rise.[Conclusion] Under the background of the intensive ecological management project in Yanchi County, the regional evapotranspiration increased significantly, the water demand of vegetation ecosystem increased obviously, and the evapotranspiration and water demand structure of different areas also changed.

Key words:evapotranspiration;SEBAL model;water consumption of ecosystem;farming-pastoral ecotone;Yanchi County

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马龙龙,杜灵通,宫菲,丹杨,王乐,郑琪琪,孟晨.基于SEBAL模型的农牧交错区蒸散演变及生态需水规律[J].水土保持通报英文版,2019,39(4):177-183

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Received:February 27,2019
Revised:March 26,2019
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Online: September 12,2019
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