| 引用本文: | 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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| 摘要: |
| 【目的】为了探索科尔沁沙地不同土地利用类型蒸散量以及水分亏缺量。【方法】本文以位于科尔沁沙地的奈曼旗为研究对象，利用MODIS数据和气象数据，通过SEBAL模型反演奈曼旗生长季的地表蒸散发。在此基础上分析了各土地利用类型的水分平衡状况。【结果】结果表明：生长季日均蒸散量最大值出现在7月为3.74 mm/d，最小值出现在9月为2.35 mm/d，整体呈现出南部较高，中部偏低的空间分布格局。蒸散发与地表温度以及地面反射率之间均呈负相关关系（R2分别为0.94，0.44），与归一化植被指数(NDVI)之间呈正相关关系（R2=0.4）。不同土地利用类型的日蒸散量从大到小的顺序为：水域＞建设用地＞林地＞耕地＞草地＞沙地。科尔沁沙地平均水分亏缺量为121 mm，南部林地以及耕地覆盖区水分亏缺量大部分超过100 mm，蒸散过程需要依靠地下水或径流方式来弥补降水不足。林地水分亏缺量达到204.7 mm，需要大量的地下水补充。【结论】所以该地区除特殊情况下不宜大面积造林。沙地的水分盈余量为16.8 mm，表明沙地是该地区水源地，对地下水资源有一定的补充作用，因此在保证沙地稳定性的同时，维持一定比例面积的沙地对科尔沁沙地生态系统的稳定性是有益的。 |
| 关键词: 蒸散发;SEBAL模型;科尔沁沙地;土地利用;MODIS数据 |
| DOI： |
| 分类号:S157.9 |
| 基金项目:基于水资源平衡的林田草沙土地利用格局优化（2019ZD007） |
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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 |
