Abstract

It has been suggested in previous studies that plant roots enlarged soil resistance to concentrated flow erosion mainly through physical (root net-link and root-soil bonding) and biochemical effects. The objective of this study is to further assess soil resistance-enlarging potential of this twofold effect of roots, especially for different textured soils. Two textured soils (silt loam and silt clay) and four kinds of soil samples (1. bared parent soils, representing samples with no root effect, 2. bared tillage soils, representing samples with biochemical effect alone, 3. root-texture cotton thread-permeated soils, representing samples with root net-link effect alone and 4. Purple alfalfa root-permeated soils, representing samples with root total effect.) were prepared and tested in flume experiments. The results showed that soil resistance to concentrated flow increased and sediment yields decreased in different degrees due to different root effects. Root physical effect increased soil resistance to a larger extent compared with root biochemical effect (the relative contribution values of root physical effect were 85% and 89% in silt loam and silt clay soil, respectively). In root physical effect, root soil bonding appeared to act as the main form, particularly in silt clay.

中文翻译：

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在模拟水槽实验中确定的植物根系土壤侵蚀抗性扩大潜力

摘要

以前的研究表明，植物根系主要通过物理（根网连接和根土结合）和生化作用来增强土壤对集中流侵蚀的抵抗力。本研究的目的是进一步评估根的这种双重效应的土壤阻力扩大潜力，特别是对于不同质地的土壤。两种质地土壤（粉质壤土和粉质粘土）和四种土壤样品（1. 裸露的母土，代表无根系效应的样品，2. 裸露的耕作土壤，代表仅具有生化作用的样品，3. 根系棉线-渗透土壤，代表仅具有根网连接效应的样品和 4. 紫色苜蓿根渗透土壤，代表具有根总效应的样品。）在水槽实验中制备和测试。结果表明，由于根系效应的不同，土壤对集中流的抵抗力不同程度地增加，产沙量不同程度地下降。与根生化效应相比，根系物理效应在更大程度上增加了土壤阻力（粉质壤土和粉质粘土中根系物理效应的相对贡献值分别为85%和89%）。在根系物理效应中，根土结合似乎是主要形式，尤其是在粉质粘土中。