三峡库区嘉陵江岸生优势须根系植物根系对土壤抗冲性的增强效应研究

Enhancement Effects of Dominant Riparian Diffuse-Rooted Plants of Jialing River in Three Gorges Reservoir Region on Soil Anti-Scouribility

对三峡库区嘉陵江江岸植被的12种优势须根系草本植物进行了研究,考察了各种植物根系对土壤抗冲性的增强作用,并利用WinRHIZO根系分析系统对各种植物根系的形态学指标进行了分析.结果表明:12种须根系植物对土壤抗冲性均有显著的增强效应,不同植物种对于土壤抗冲性增强的贡献大小不同,贡献大小与根系特征密切相关.建立了各种植物对土壤抗冲性增强值与根系生物量及形态学指标之间的回归关系,推荐了几种适用于江岸稳定和水土保持控制的具有推广价值的高土壤固持能力的植物物种.

Vegetation plays a key role in control of soil erosion. In general, herbaceous plants are superior to shrub and tree species in water and soil conservation. In this paper, 12 dominant diffuse-rooted species from riparian zones along the Jialing River were selected and their enhancement effects on soil antiscouribility were determined. In the meantime, the root morphology of each species was quantified by using WinRHIZO root analysis system. The results showed that, diffuse-rooted herbaceous plants had large enhancement effects on soil anti-scouribility, and the enhancement effects vary in different species. It was found that the enhancement effect on soil anti-scouribility was correlated with root biomass, total root length, root surface area and root volume. Based on the results, it is clear that some species are appropri ate in soil and water conservation.