基于HYDRUS-1D模型的植物根系对人工基质水分特征曲线参数的影响  

Effect of plant roots on water characteristic curve parameters of artificial substrate based on HYDRUS-1D model

作　　者：陈雨 陈璇 刘瑞芬 CHEN Yu;CHEN Xuan;LIU Ruifen(Hubei Key Laboratory of River and Lake Ecological Restoration and Algae Utilization,College of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068)

机构地区：[1]湖北工业大学土木建筑与环境学院,河湖生态修复与藻类利用湖北省重点实验室,武汉430068

出　　处：《环境科学学报》2022年第8期325-336,共12页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金青年科学基金项目(No.51909081)。

摘　　要：为了定量揭示绿色屋顶植物根系对人工基质水力特性的影响,选用两种景天属植物(垂盆草和佛甲草)及两种人工基质(珍珠岩和蛭石)进行水分及溶质运移实验,基于HYDRUS-1D模型反演人工基质水分特征曲线参数,以此分析植物根系所引起的人工基质水分特征曲线参数的变化.结果发现,植物根系使两种人工基质残余含水率θ_(r)降低、权重系数w增加.不同植物根系对两种人工基质饱和含水率θs的影响不同,体现为垂盆草根系相较佛甲草根系对θ_(s)的影响范围更小.植物根系对人工基质吸力参数α_(1)、α_(2)的改变效应随人工基质种类发生变化,表现为珍珠岩基质α1、α2均因垂盆草根系得以提高、因佛甲草根系而降低,蛭石基质α_(1)、α_(2)则因植物根系分别降低和增加.研究结果可为绿色屋顶植物-人工基质结构优化提供科学依据.In order to reveal the effect of plant roots on hydraulic properties of artificial substrate for green roofs,two types of sedum plants(Sedum sarmentosum Bunge and Sedum lineare Thunb,respectively)and two types of artificial substrates(perlite and vermiculite,respectively)were used for water and solute transport experiments.Water characteristic curve parameters of artificial substrate were calculated inversely by HYDRUS-1D model,and the root-induced changes of these parameters were analyzed.For both artificial substrates,the residual water contentθr is decreased and the weight coefficient w is increased with the existence of plant roots.Different types of plant roots have different effects on the saturated water contentθs.For both artificial substrates,the root-induced change inθs from Sedum sarmentosum Bunge is smaller than that from Sedum lineare Thunb.The effects of plant roots on the suction parametersα_(1) andα_(2) vary with the types of artificial substrates.For the perlite substrate,the values of bothα_(1) andα_(2) are increased with the roots of Sedum sarmentosum Bunge but are decreased with the roots of Sedum lineare Thunb.For the vermiculite substrate,while the value ofα_(1) is decreased,the value ofα_(2) isincreased due to the plant roots.These results can provide a scientific basis for the structural optimization of plant-artificial substrates for green roofs.

关 键 词：绿色屋顶 景天属植物 人工基质 水分及溶质运移 HYDRUS-1D 参数反演 

分 类 号：X143[环境科学与工程—环境科学]