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

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6393-6405.

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

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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 θ_r、n₁、w and K_s 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, θ_r increased continuously but θ_s, 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.

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green roofs / hydraulic properties / influencing factors / plant growth / root distribution functions / water flow migration

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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[J]. China Environmental Science. 2023, 43(12): 6393-6405

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