| Cite this article: | 苗林,张成福,王雨晴,等.科尔沁沙地不同土地利用类型对区域水分平衡影响的分析[J].灌溉排水学报,0,():-. |
| Miao lin,Zhang cheng fu,Wang yu qin,et al.科尔沁沙地不同土地利用类型对区域水分平衡影响的分析[J].灌溉排水学报,0,():-. |
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| Effect of different land use types on regional water balance in Horqin Sandy Land |
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Miao lin, Zhang cheng fu, Wang yu qin, He shuai, Han ya lu, Li xiang, Zhang xin lei
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Inner Mongolia Agricultural University
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| Abstract: |
| [Objective] In order to explore the evapotranspiration and water deficit of different land use types in Horqin sandy land.[Method] Based on MODIS data and meteorological data, the surface evapotranspiration of Naiman Banner in growing season was retrieved by SEBAL model. On this basis, the water balance of each land use type was analyzed.[Result] The results showed that: the maximum value of daily average evapotranspiration was 3.74 mm/d in July, and the minimum value was 2.35 mm/d in September, showing a spatial distribution pattern of higher in the South and lower in the middle.
Evapotranspiration was negatively correlated with land surface temperature and reflectance (R2 = 0.94 and 0.44), and positively correlated with normalized vegetation index (NDVI) (R2 = 0.4). The order of daily evapotranspiration of different land use types from large to small is: water area > construction land > woodland > cultivated land > grassland > sandy land. The average water deficit in Horqin sandy land is 121 mm, and most of the water deficit in southern woodland and cultivated land is more than 100 mm. The evapotranspiration process depends on groundwater or runoff to make up for the lack of precipitation. The water deficit of woodland is 204.7 mm, which needs a lot of groundwater supplement. [Conclusion] Therefore, it is not suitable for large-scale afforestation in this area except under special circumstances. The water surplus of the sandy land is 16.8 mm, which indicates that the sandy land is the water source of the area and has a certain supplementary effect on the groundwater resources. Therefore, it is beneficial to maintain a certain proportion of the sandy land to the stability of the Horqin sandy land ecosystem while ensuring the stability of the sandy land. |
| Key words: Evapotranspiration; SEBAL model; Horqin sandy land; land use; MODIS data |
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