Evaluating the influence of water table depth on transpiration of two vegetation communities in a lake floodplain wetland
Evaluating the influence of water table depth on transpiration of two vegetation communities in a lake floodplain wetland
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DOI：
10.2166/nh.2016.011
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发表时间：
2016-12
影响因子：
2.7
通讯作者：
Xiuli Xu;Qi Zhang;Yunliang Li;Xianghu Li
中科院分区：
文献类型：
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作者：
Xiuli Xu;Qi Zhang;Yunliang Li;Xianghu Li
地下水在洪泛区湿地植被供水方面发挥着重要作用。探索地下水位深度 (WTD) 对植被蒸腾的影响对于加深对植被、土壤水和地下水之间相互作用的了解至关重要。在本研究中，使用 HYDRUS-1D 模型模拟了漫滩湿地（中国鄱阳湖湿地）中两种典型植被群落——茵陈蒿和芦苇的吸水量。比较了两种不同水文条件下的植被蒸腾量：高地下水位（2012 年）和低地下水位（2013 年）。结果表明，植被主生长阶段（7-10月）蒸腾量受WTD影响显着。在高地下水位条件下，A. capillaris 和 P .主要生长阶段的澳洲螟群落总面积分别为334毫米和735毫米，占潜在蒸腾量的90%以上。在低地下水位条件下，由于水分胁迫，它们分别降至203和510毫米，仅占潜在蒸腾量的55%。情景模拟发现WTD与地下水对植被蒸腾作用的比例之间存在不同的线性关系。主生长期WTD每增加1m，该比例可降低约25%。
Groundwater plays an important role in supplying water to vegetation in floodplain wetlands. Exploring the effect of water table depth (WTD) on vegetation transpiration is essential to increasing understanding of interactions among vegetation, soil water, and groundwater. In this study, a HYDRUS-1D model was used to simulate the water uptake of two typical vegetation communities, Artemisia capillaris and Phragmites australis , in a floodplain wetland (Poyang Lake wetland, China). Vegetation transpiration was compared for two distinct hydrological conditions: high water table (2012) and low water table (2013). Results showed that vegetation transpiration in the main growth stage (July–October) was significantly influenced by WTD. Under high water table conditions, transpiration of A. capillaris and P . australis communities in the main growth stage totaled 334 and 735 mm, respectively, accounting for over 90% of the potential transpiration. Under low water table conditions, they decreased to 203 and 510 mm, respectively, due to water stress, accounting for merely 55% of the potential transpiration. Scenario simulations found different linear relationships between WTD and the ratio of groundwater contribution to vegetation transpiration. An increase of 1 m in WTD in the main growth stage may reduce the ratio by approximately 25%.