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

陈雨; 刘瑞芬; 刘德富

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (12) : 6393-6405.

水污染与控制

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

陈雨, 刘瑞芬, 刘德富

作者信息 +

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

Author information +

文章历史 +

摘要

为了定量揭示绿色屋顶景天属植物根系不同生长阶段对人工基质水力特性及水分运移的影响,将佛甲草培养于14cm厚的蛭石基质中,培养至30 , 60和90d后,进行根系特征测定及根系根长频率分布函数评价;并基于根系根长频率分布函数和蒸渗试验数据预测含植物根系的蛭石基质水力特性,以此分析根系生长对水力特性的影响;最后采用HYDRUS-1D模拟分析武汉市典型丰水年降雨条件下佛甲草—蛭石基质水分运移规律.结果发现,三种根系根长频率分布函数中,由对数正态分布函数所预测的佛甲草根系表面积和根系体积误差均小于20%,适用于佛甲草根系特征的量化.含植物根系蛭石基质水力特性参数θ_r、n₁、w和K_s相较于不含植物根系情形均增加、α₂和n₂均减少;在根系生长阶段θ_r一直增大、θ_s、α₂和w一直减小.当考虑佛甲草根系四季(春、夏、秋、冬)生长状态时,含植物根系蛭石基质蒸发量相较于不含植物根系情形分别减少4.46%、2.94%、8.91%和7.56%,截流率分别减少1.64%、1.22%、7.10%和7.06%.

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.

导出引用

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

中图分类号： X522

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