DETACHMENT RATE, SOIL ERODIBILITY, AND SOIL STRENGTH AS INFLUENCED BY LIVING PLANT ROOTS PART I: LABORATORY STUDY
DETACHMENT RATE, SOIL ERODIBILITY, AND SOIL STRENGTH AS INFLUENCED BY LIVING PLANT ROOTS PART I: LABORATORY STUDY
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DOI：
10.13031/2013.6445
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发表时间：
2001
影响因子：
1.5
通讯作者：
M. Mamo;G. Bubenzer
中科院分区：
文献类型：
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作者：
M. Mamo;G. Bubenzer
长期以来，人们都知道活的植物根可以增加土壤的抗剪强度，增强团聚体的稳定性。通过田间试验研究了玉米活根对土壤肥力的影响。和大豆（Glycine max L.）强度，剥离率，和可蚀性的普莱诺粉质壤土（细粉质，混合，中质，典型Argiudolls）使用预制细沟模拟集中流。对实验地点进行常规耕作，清除所有植物材料，分成15个小区，并按阶段完全随机化。每个小区被进一步分为四个土壤条件，细沟小区，2米宽，5.5米长，准备新鲜耕作，休闲，大豆，玉米处理。除新耕地块外，在植物生长的三个阶段进行了侵蚀实验。在每次侵蚀测量之后，收集根部样品并确定其长度。这个根参数后来与土壤剥离率和可蚀性。土壤强度指数、剥离率和细沟可蚀性在根地和休闲地之间差异显著（P0.05），土壤强度、剥离率和细沟可蚀性在作物之间差异显著。比较各处理内作物生理发育阶段和休闲土壤耕作后时间的平均Dr和Kr值，大豆在II和III阶段之间以及玉米在所有3个阶段之间均存在显著差异（P0.05）。
Living plant roots have long been known to increase soil shear strength and enhance aggregate stability. A field experiment was conducted to study the influence of living roots of corn (Zea mays L.) and soybean (Glycine max L.) on strength, detachment rate, and erodibility of a Plano silt loam soil (fine–silty, mixed, mesic, Typic Argiudolls) using preformed rills to simulate concentrated flow. The experimental site was conventionally tilled, cleared of all plant material, divided into 15 plots, and completely randomized by stage. Each plot was further divided into four soil conditions, and rill plots, 2 m wide and 5.5 m long, were prepared for freshly tilled, fallow, soybean, and corn treatments. With the exception of freshly tilled plots, erosion experiments were conducted at three stages of plant growth. Following each erosion measurement, root samples were collected and their length determined. This root parameter was later related to soil detachment rate and erodibility. Differences in soil strength indices, detachment rate, and rill erodibility between rooted and fallow soils were significant (P 0.05) in soil strength, detachment rate, and rill erodibility between the crops. Comparison of average Dr and Kr values among physiological stages of development for crops and time since tillage for fallow soils within each treatment showed that there were significant differences (P 0.05) was observed between stages II and III for soybean and among all three stages for corn.