绿色屋顶景天植物根系分布特征及其对饱和导水率的影响  

Root distribution characteristics of green roof Sedum plants and their effects on saturated hydraulic conductivity

作　　者：陈璇 刘瑞芬 CHEN Xuan;LIU Ruifen(School of Civil Engineering,Architecture and Environment,Hubei University of Technology;Hubei Provincial Key Laboratory of River and Lake Ecological Restoration and Algae Utilization;Hubei YongYeHang Appraisal Consulting Co.,Ltd.)

机构地区：[1]湖北工业大学土木建筑与环境学院 [2]河湖生态修复与藻类利用湖北省重点实验室 [3]湖北永业行评估咨询有限公司

出　　处：《环境工程技术学报》2023年第1期423-430,共8页Journal of Environmental Engineering Technology

基　　金：国家自然科学基金青年科学基金项目(51909081)。

摘　　要：为丰富我国绿色屋顶中景天属植物根系分布特征的研究及探讨根系特征参数与绿色屋顶基质层饱和导水率间的关系,选用景天属植物垂盆草、佛甲草种植于珍珠岩基质中,基质厚度为6、10、14 cm,结合武汉市降水特点对植物采用统一浇水制度进行培养,选取根长密度、根表面积密度、根体积密度来描述根系形态,并测定基质的饱和导水率;以无植物组为对照组,定量比较不同基质厚度下绿色屋顶景天属植物根系分布特征及其饱和导水率的变化差异。结果表明:1)景天属植物的根长密度、根表面积密度、根体积密度受珍珠岩基质厚度影响显著。6 cm基质中植物的总根长密度最大,这与基质中直径为0.2~0.4 mm根的根长密度占比大有关;14 cm基质中植物的总根表面积密度、根体积密度最大,这与基质中直径为1~2 mm根的根表面积密度、根体积密度占比大有关。2)景天属植物根系对珍珠岩基质饱和导水率的改变显著。相比无植物组,景天属植物根系的加入使得珍珠岩基质的饱和导水率改变了-98.95%~-95.15%,有植物组的饱和导水率远低于无植物组;而有植物组间,珍珠岩基质的饱和导水率与景天属植物直径为0.2~0.4 mm根的根长密度(P=0.050,R2=0.786)、根表面积密度(P=0.047,R2=0.818)、根体积密度(P=0.044,R2=0.824)呈显著正相关。In order to enrich the research on the distribution characteristics of the root system of Sedum plants in green roofs in China,and to explore the relationship between the root characteristic parameters and the saturated hydraulic conductivity of the green roof matrix layer,Sedum sarmentosum and Sedum lineare were planted in perlite substrate with a depth of 6,10,and 14 cm.The plants were cultivated in a uniform watering system in accordance with the characteristics of rainfall in Wuhan.The root length density,root surface area density,root volume density were selected to describe the root morphology,and the saturated hydraulic conductivity of each group was measured.The group without plants was used as a control to quantitatively compare the root distribution characteristics of Sedum plants and the variation of saturated hydraulic conductivity under different substrate depths.The results showed that:1)The root length density,root surface area density,and root volume density of Sedum plants were significantly affected by the depth of the perlite substrate.Under the same conditions,the root diameter of plants in the 6 cm substrate ranged from 0 to 0.8 mm,and the total root length density was the highest,which was mainly related to the roots with a diameter of 0.2 to 0.4 mm.The root diameter of plants in the 14 cm substrate ranged from 0 to 2 mm.The total root surface area density and root volume density were the largest,and their values were mainly related to the roots with a diameter of 1 to 2 mm.2)Compared with the group without plants,the addition of Sedum roots changed the saturated hydraulic conductivity of the perlite substrate by-98.95%to-95.15%,and the saturated hydraulic conductivity of the plant group was much lower than that of the non-plant group.For the plant group,the saturated hydraulic conductivity had a significant positive correlation with the root length density(P=0.050,R2=0.786),root surface area density(P=0.047,R~2=0.818),and root volume density(P=0.044,R~2=0.824)of Sedum plants with a diameter

关 键 词：绿色屋顶 景天属植物 根长密度 根表面积密度 根体积密度 饱和导水率 

分 类 号：X173[环境科学与工程—环境科学] TU992[建筑科学—市政工程]