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Seasonal and spatial variations of water use among riparian vegetation in tropical monsoon region of SW China 

 
论文编号:
作者: Wang PY
刊物名称: Ecohydrology
所属学科:
论文题目英文: Seasonal and spatial variations of water use among riparian vegetation in tropical monsoon region of SW China
年: Mar 2019
卷: 12
期:
页: e2085
联系作者: Liu WJ
收录类别:
影响因子: 2.755
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摘要:
Riparian vegetation is an important inhabitant of numerous forest ecosystems, though it is vulnerable and affected by the changes in climate or microclimate. Due to the fluctuation in rainfall and surface water availability, riparian plants usually exposed to two different seasons throughout the year: a dry season and a rainy season. However, water use patterns among riparian plants are still poorly understood in the tropical monsoon region. In this study, we used stable isotope techniques (δD and δ18O) coupled with MixSIAR model to identify the water sources for riparian plants in in a tropical forest of SW China. The results showed an apparent seasonal variation in water use patterns for most trees, while the spatial variations were less pronounced between the terrace and floodplain sites. Among most riparian trees, deep soil (below 50 cm) was the main water source in the dry season, while shallow soil (above 15 cm) was the primary water source during the rainy season. However, there were no change in water source for herbs and other shallowrooted species with the fluctuation in water availability. This result indicates that shallowrooted plants (i.e. herbs and seedlings) struggle for their survivability in a riparian ecosystem because of the water scarcity in shallow soil during the dry season. Thus, lower rainfall and/or extended dry period may affect the productivity and sustainability of riparian vegetation under a future climate change scenario.
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