【摘要】 以研究植物根系密度、根量及根层土壤剖面特征为基础,以退耕自然生草地和农耕地(横坡玉米+红薯)为对照,对两种果草模式根系提高土壤抗蚀性进行了定量研究。结果表明:土壤的抗蚀性与土体中根系含量密切相关,两种果草模式的根系总长度、根系表面积和根系总生物量都要明显高于自然生草地,而且这些根系指标与土壤抗蚀性呈正相关变化,这与水稳性团聚体和有机质含量与土壤抗蚀性呈正相关变化的趋势一致;果草模式土壤抗分散的能力得到了相当程度的改善,颗粒间团聚程度有了明显提高,土壤团粒结构得到了一定程度的改良;在南沱镇紫色土坡地发展的果草示范模式,其根系明显地提高了土壤的抗蚀性,可以在三峡库区范围内推广。更多还原

【Abstract】 Based on the research of root system density, root biomass and root-layer soil profile characteristic ofplant, and taking the returned natural grassland and agriculture cultivated land (horizontal slope Intercroppingcorn-potato) as comparison, this article has quantificationally studied on root systerm of two kinds of intercroppingorchard-pasturage model improving soil anti-erodibility. The results showed that: there is close connection be-tween soil anti-erodibility and soil root system content ; Total length 、surface area and total biomass of soil root sys-tem of two kinds of intercropping orchard-pasturage model are clearly more than natural grassland, soil anti-erodi-bility changed along with each of these root system indexes and showed positive correlativity, this performance isconsistent with the influence of water-stable aggregation and organicmatter content on soil anti-erodibility; Theanti-scattered ability of soil has got the improvement that matches the level, aggregation extent of granules has ob-viously raised, and soil granular structure has got the amelioration of fixed level; The intercropping orchard-pas-turage demonstration model developed on the slopeland of purple soil in Nantuozhen, because its root system hasclearly raised soil anti-erodibility,it can be popularized in the scope of three gorges reservoir region.更多还原