地形对乌干达kakuto微集水区土壤可食性的影响

M. Majaliwa, M. Magunda, M. M. Tenywa, M. Isabirye
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引用次数: 2

摘要

土壤可蚀性是决定土壤对侵蚀过程脆弱性的一种特性。利用便携式降雨模拟器对维多利亚湖流域kakuto微集水区7种土壤类型(单溶溶土、单溶溶土、骨溶溶土、骨溶溶土、rhodic骨溶土、铁溶溶土、铁溶溶土)的沟间可蚀性进行了测量,并对其拓扑序列格局进行了野外研究。在0.25 × 0.25 m地块上,模拟降雨7 mm/min,持续5 min;每种土壤类型在两种湿度(干和湿)下进行了16次试验。结果表明,两组间可蚀性差异均无统计学意义:单链Acrisols、单链Luvisols、Rhodic骨Acrisols,其次是骨Acrisols、铁Acrisols、铁Rhodic Acrisols和骨Luvisols (p=0.011)。第一组比第二组受到的侵蚀更严重。沟间可蚀性沿地形顺序有显著差异(p=0.05),向坡脚方向增加。坡脚沟间可蚀性为4.13 × 106kg/m2s,上、中部景观位置可蚀性分别为1.05 × 106/kgm4s和1.74 × 106/kg/m2s;分别。
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Effect of Topography on Soil Eredibility in Kakuuto Micro-Catchment, Uganda
ABSTRACT Soil erodibility is a property that determines the vulnerability of a soil to erosion processes. Interrill erodibility of 7 soil types, haplic Luvisols, haplic Acrisols, skeletic Luvisols, skeletic Acrisols, rhodic skelectic Acrisols, ferric Acrisols, ferri Rhodic Acrisols of Kakuuto micro-catchment of the Lake Victoria basin was measured, and its toposequence pattern investigated using a portable rainfall simulator in the field. Simulated rainfall of 7 mm/min was applied for 5 min on 0.25 by 0.25 m plots; 16 tests were run on each soil type, under 2 moisture regimes (dry and wet). Results indicated that there were 2 groups of no pairewise significant difference in interill erodibility: haplic Acrisols, haplic Luvisols, Rhodic skeletic Acrisols, and skeletic Acrisols, ferric Acrisols, ferri rhodic Acrisols and skeletic Luvisols (p=0.011) being the second. The first group was more eroded than the second. Significant differences (p=0.05) were observed along the toposequence on interrill erodibility with an increase towards the footslope. The footslope interrill erodibility was 4.13 × 106kg/m2s while values of 1.05 × 106/kgm4s and 1.74 × 106/kg/m2s were observed at the upper and the middle landscape position; respectively.
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