土壤学报2011，Vol.48Issue(1)：160-167,8.
三峡库区几种耐水淹植物根系特征与土壤抗水蚀增强效应
ROOT FEATURES OF SEVERAL FLOODING-TOLERANT PLANTS AND THEIR ROLES IN ENHANCING ANTI-ERODIBILITY OF THE SOIL IN THREE GORGES RESERVOIR REGION
摘要
Abstract
To investigate characteristics of the root systems of the plants comprising the vegetation in the waterlevel-fluctuation-zone of the Three Gorges Reservoir Region and their influence on the anti-erodibility of soil, 6 flooding-tolerant plants, i.e. Cynodon dactylon (L) Pers. , Alternanthera philoxeroides (Mart) Griseb, Triarrhena sacchariflora Nakai, Hemarthria compressa (L. f. ) R. Br. , Cyperus rotundus L. , and Arundinella anomala Steud,were selected and investigated in the experiment. Root-soil core samplers (Eijkelkamp agrisearch equipment model 15.01 ) were used to take samples from the fields for analysis, a modified hydraulic flume device was applied to analyze the soil samples for water erosion rate and thereafter obtain anti-erodibility enhancement coefficients of root systems of the 6 plants. Root analysis system (WinRHIZO Pro. 2004c) was used to characterize the root systems.It was found that Alternanthera philoxeroides (Mart) Griseb, Triarrhena sacchariflora ( Maxim. ) Nakai, Cyperus rotundus L. , and Cynodon dactylon ( L. ) Pers. had higher mean root/shoot ratio, while Arundinella anomala Steud.and T sacchariflora had larger root length density (RLD) and root surface area density (RSAD). Soils containing roots exhibited smaller soil erosion rate obviously. A. philoxeroides, T. sacchariflora and A. anomala had significantly higher anti-erodibility enhancement coefficient ( Ec ) than the other three plants, with Ec presenting good linear relationship with RLD and RSAD. As to roots of different sizes, roots with D ≤ 2 mm were closely related with soil anti-erodibility, and their RLD and RSAD showed good linear relationship with Ec. This relation got weaker as the root diameter increased it was demonstrated that all six plants enhanced soil anti-erodibility significantly, in which A. philoxeroides, T. sacchariflora and A. anomala showed much better effect. It is concluded that RLD and RSAD are good indexes to characterize soil anti-erodibility, especially RLD and RSAD of roots with D ≤ 2 mm or D ≤ 0.5 mm.关键词
三峡库区/消落区/耐水淹植物/土壤抗水蚀/根长密度/根表面积密度Key words
The water-level-fluctuation-zone/ Three Gorges Reservoir Region/ Flooding-tolerant plants/ Soil anti-erodibility/ Root length density/ Root surface area density分类
农业科学引用本文复制引用
徐少君,曾波,类淑桐,苏晓磊..三峡库区几种耐水淹植物根系特征与土壤抗水蚀增强效应[J].土壤学报,2011,48(1):160-167,8.基金项目
国家自然科学基金项目(30770406、31070474)、重庆市科技攻关项目(CSTC2007AB7049)联合资助 （30770406、31070474）
