Models for calculating phreatic water evaporation on bare and Tamarix-vegetated lands
Models for calculating phreatic water evaporation on bare and Tamarix-vegetated lands
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DOI：
10.1007/s11434-006-8206-z
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发表时间：
2006
影响因子：
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通讯作者：
Shun-jun Hu;C. Tian;Yudong Song;Xiaobing Chen;Yuetan Li
中科院分区：
文献类型：
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作者：
Shun-jun Hu;C. Tian;Yudong Song;Xiaobing Chen;Yuetan Li
地下水是干旱区天然植被耗水的主要来源。潜水蒸发是研究天然植被生态需水的有效途径。为研究塔里木河流域生态需水，根据阿克苏水平衡试验站1989 ~ 1996年裸地潜水蒸发观测资料，通过分析潜水蒸发、潜水面深度与水分蒸发的关系，以潜水蒸发极限速率为控制条件，根据潜水蒸发与水分蒸发之间存在非线性关系的客观规律，建立了能充分反映塔里木河流域潜水蒸发规律的裸地潜水蒸发计算模型。根据2003 ~ 2004年红柳植被地蒸散引起水位下降时的潜水面深度和土壤含水量资料，计算了红柳植被地的潜水蒸发量，建立了红柳植被地潜水蒸发计算模型。裸地和柽柳植被地的潜水蒸发可以通过柽柳植被转换系数相互转换。试验结果表明，模型计算精度较高，适用于塔里木河流域。
Groundwater is the main source of water consumption of natural vegetation in arid regions. It is an effective approach to study ecological water demand of natural vegetation by phreatic evaporation. In order to study the ecological water demand of Tarim river basin, based on the observation data of phreatic evaporation on bare lands at the Aksu Water Balance Experimental station from 1989 to 1996, by analyzing the relationship of phreatic evaporation, depth of phreatic surface and evaporation of water, taking the limit rate of phreatic evaporation as the control condition, and based on the objective law that the relation between phreatic evaporation and evaporation of water is nonlinear, we establish models for calculating phreatic evaporation on bare land, which can fully reflect the law of phreatic evaporation in the Tarim river basin. According to the data of depth of phreatic surface and soil moisture when pheratic level decline is caused just by evapotranspiration on Tamarix-vegetated land from 2003 to 2004, we calculate the amount of phreatic evapora-tion and set up models for calculating phreatic evaporation on Tamarix-vegetated land. Phreatic evaporation on bare land and Tamarix-vegetated land could be transformed each other by a Tamarix vegetation conversion coefficient. The test results show that the calculation accuracy of the models is high and the models are suitable for Tarim river basin.