Effects of Sedum lineare Thunb roots at different growth stages on hydraulic properties and water flow migration of vermiculite substrate
CHEN Yu, LIU Rui-fen, LIU De-fu
Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei Key Laboratory of Ecological Remediation of River-lakes and Algae Utilization, Department of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China
Abstract：The study aims to reveal the effect of sedum plant roots at different growth stages on hydraulic properties and water flow migration of artificial substrate for green roofs. Sedum lineare Thunb was cultured in the 14cm-depth vermiculite substrate, and thereafter, plant root characteristics were measured and root length frequency distribution functions were evaluated at 30d, 60d and 90d. Based on root length frequency distribution functions and obtained lysimeter data, hydraulic characteristics of vermiculite substrate containing plant roots were predicted, and the effect of root growth on substrate hydraulic characteristics were analyzed. Finally, water flow migration of Sedum lineare Thunb-Vermiculite substrate under the rainfall condition of a typical hydrological year in Wuhan was simulated by HYDRUS-1D model. The results showed that among three root length frequency distribution functions, errors of predicted root surface area and root volume from the lognormal distribution function were both less than 20%, indicating the function was suitable for the sedum root quantification. The results also showed that the hydraulic characteristic parameters θr、n1、w and Ks of vermiculite containing plant roots were increased, while α2 and n2 were reduced, when compared with parameters from vermiculite without plant roots. During the whole plant root growth stage, θr increased continuously but θs, α2 and w decreased continuously. Compared with data from the simulation scenario of vermiculite without plant roots, evapotranspiration of vermiculite substrate with Sedum lineare Thunb roots from four seasons (spring, summer, autumn and winter) were reduced by 4.46%, 2.94%, 8.91% and 7.56% respectively, and rainfall volume reduction rates were also reduced by 1.64%, 1.22%, 7.10% and 7.06% respectively.
陈雨, 刘瑞芬, 刘德富. 不同生长阶段佛甲草根系对蛭石基质水力特性及水分运移的影响[J]. 中国环境科学, 2023, 43(12): 6393-6405.
CHEN Yu, LIU Rui-fen, LIU De-fu. Effects of Sedum lineare Thunb roots at different growth stages on hydraulic properties and water flow migration of vermiculite substrate. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6393-6405.
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