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摘要: 在干旱-半干旱地区，研究植物的耗水特征及与气象因子、地下水水位的关系对水资源合理开发利用和生态环境保护具有重要的意义。采用原位监测方法，对气象、树干液流、土壤含水率和地下水水位进行了观测，研究了毛乌素沙地广泛分布及与地下水关系密切的旱柳与气象因子、土壤含水率以及地下水水位的关系。研究表明：水汽压亏缺和潜在蒸散发是控制旱柳耗水最重要的气象因素；研究期内，土壤含水率对旱柳耗水的影响较小；旱柳的耗水与地下水具有密切的关系，随着水位埋深的增大，旱柳的耗水先增大后减小，在水位埋深1.25 m处达到最大。利用地下水的昼夜波动计算了地下水的蒸散发消耗量，发现旱柳的用水与地下水的蒸散发消耗量具有一定的相关性，表明地下水是旱柳重要的用水水源。Abstract: In arid and semi-arid regions, studies of the relationship among plant water use, climatic factors and water table is essential to the rational development and utilization of water resources as well as environmental protection. Based on the in-situ monitoring methods, climate, sap flow, soil moisture and water table are measured. The relationship between climatic factors, soil moisture and water table and sap flow of willows, a widely distributed and groundwater-dependent tree in the Muus Sandland, was examined. The results indicate that vapor pressure deficit and potential evapotranspiration have a close relation to water consumption of willows. Soil moisture has a minimal influence on water consumption of willows during the study period. Water consumption of willows is closely related to water table. With the increase in the depth to the water table, water consumption increases and then decreases and reaches the peak values when the depth to the water table is 1.25 m. Groundwater evapotranspiration is calculated based on the diurnal water table and it is found that water use of willows has a good correlation to groundwater evapotranspiration, indicating that groundwater is a major water source to willows.
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Key words:
- climatic factors /
- groundwater /
- willow /
- sap flow /
- Muus sandland
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