Correlating between evapotranspiration and precipitation provides insights into Xilingol grassland eco-engineering at larger scale
Correlating between evapotranspiration and precipitation provides insights into Xilingol grassland eco-engineering at larger scale
复制标题
蒸散量与降水量的关联为锡林郭勒草原生态工程提供了更大规模的见解
DOI：
10.1016/j.ecoleng.2015.07.015
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发表时间：
2015-11-01
影响因子：
3.8
通讯作者：
Zhang Zichang
中科院分区：
文献类型：
--
作者：
Zhang Shengwei;Shen Rui;Zhang Zichang
中国北部的锡林郭勒草原是内蒙古最大的草原生态系统，在当地生态系统中占有重要地位。然而，该地区的草原沙化和退化相当严重。为此，我们利用双作物系数模型模拟了锡林郭勒草原西乌珠穆沁巴拉郭尔河流域代表性地区牧草生长期的日实际蒸散量和土壤水分。此外，将模拟结果与实际数据进行了对比，发现土壤水分的实际测量数据与模拟数据之间的R2=0.662，误差为4.14%。2013年全生育期模拟总蒸散量为332.41 mm，其中草地蒸腾215.13 mm(64.7%)，土壤蒸发117.28 mm。然后随机选取不同生育期的降水量和ET值进行分析。结果表明，各参数的绝对值R值均大于0.5，表明ET随时间的变化与降水高度相关。通过将降水量减少到实际值的一半，模型预测ET为257.71 mm(比自然条件下的值少22.5%)，蒸腾量为176.84 mm(比自然条件下的值少17.8%)，土壤蒸发量为80.87 mm(比自然条件下的值少31%)。假设降水量减少一半，模型预测的蒸发量为274.89 mm ET(比实际值减少17.3%)、190.05 mm草原蒸腾(比实际值减少11.7%)和84.85 mm土壤蒸发量(比实际值减少27.7%)。(C)2015爱思唯尔B.V.保留所有权利。
The Xilingol Grassland in Northern China is the largest grassland ecosystem of Inner Mongolia and plays an important role in the local ecosystem. However, grassland desertification and degradation are quite severe in this area. Therefore, we simulated the daily actual evapotranspiration (ET) and soil water content in a representative area of the Xilingol Grassland, West Ujimqin Balaguer River basin, during the grass growth period by using the dual crop coefficient model. In addition, we compared the simulation results with actual data and found that the R-2 value between the actual measurement data and simulation data for soil water content was 0.662 with an error of 4.14%. The simulated total ET during the entire growth period in 2013 was 332.41 mm, including 215.13 mm grassland transpiration (64.7%) and 117.28 mm soil evaporation. Then we randomly selected precipitation and ET values for different growth periods for analysis. The results showed that the absolute R values are all higher than 0.5, which indicates that variations in ET are highly correlated with precipitation over time. By reducing the precipitation to half the actual values, the model predicts 257.71 mm ET (22.5% less than the value in natural conditions), 176.84 mm transpiration (17.8% less than the value in natural conditions), and 80.87 mm soil evaporation (31% less than the value in natural conditions). By assuming that the precipitation was reduced by half, the model predicts 274.89 mm ET (17.3% less than the actual value), 190.05 mm grassland transpiration (11.7% less than the actual value), and 84.85 mm soil evaporation (27.7% less than the actual value). (C) 2015 Elsevier B.V. All rights reserved.