鄱阳湖典型洲滩湿地植物根系对水分垂向通量的影响

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Abstract Soil water retention curve (SWRC) governs soil water transport. Plant roots significantly change SWRC, thus affecting the dynamic conditions of soil moisture. In order to quantitatively reveal the hydrological effects of wetland plant roots, this paper used the physical model HYRUS-1D to simulate soil water movement of the Artemisia capillaris community in the Wucheng Wetland National Nature Reserve of Poyang Lake. Roots increased the soil saturated water content and air entry potential, which leads to an increase of soil water content and soil water storage capacity. The calibrated spatial and temporal changes of the observed data of soil water content at different depths are more consistent when considering the root effects on SWRC. The correlation coefficient of the fitting on the with and without considering the root effects were 0.83and 0.85, respectively. The root mean square error of the measured and simulated soil water content at 10cm and 50cm depths decreased by 61% and 83%, respectively. At the same time, the simulation under this calibration method has a difference of up to 34% in groundwater recharge compared with previous studies. Considering the typical root effects under field conditions, the evapotranspiration and cumulative groundwater flux were increased by 10% and 150%, respectively. Under extreme drought conditions, it improved upward flux of the groundwater by 7%~56% with cumulative difference of 38~312cm. Meanwhile, root effects increased evapotranspiration by 13%. Moreover,root effects on evapotranspiration would be amplified if deeper groundwater during the growing season. In the relevant wetland eco-hydrological processes, wetland water and material balance studies, it is recommended to fully assess the hydrological effects of wetland plant roots and consider it throughout the hydrological process based on the calculated working conditions.

Key words： soil hydraulic properties wetland plant root effects plant-soil system vertical water flux Poyang Lake Wetland

Received: 22 October 2019

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X143

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	Articles by authors
	LU Jian-rong
	ZHANG Qi
	LI Yun-liang
	TAN Zhi-qiang
	GUO Yu-yin

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LU Jian-rong,ZHANG Qi,LI Yun-liang等. Impact of typical plant roots on vertical soil water movement in Poyang Lake Wetland: a numerical study[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2180-2189.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/2180

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