Effect of Different Elevation on Soil Physica-l chemical Properties and Erodibility in Dry-Hot Valley

LI Peng; LI Zhan-bin; ZHENG Yu

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Effect of Different Elevation on Soil Physica-l chemical Properties and Erodibility in Dry-Hot Valley

- Effect of Different Elevation on Soil Physica-l chemical Properties and Erodibility in Dry-Hot Valley
- Bulletin of Soiland Water Conservation Vol. 30, Issue 4, Pages: 103-107(2011)
- 作者机构：
  
  1. 西安理工大学西北水资源与环境生态教育部重点实验室,陕西,西安,710048
  2. 西北农林科技大学水土保持研究所陕西杨凌,712100
  3. 中国科学院水利部水土保持研究所陕西杨凌,712100
- 作者简介：
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- Published：2011
- 稿件说明：
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LI Peng, LI Zhan-bin, ZHENG Yu. Effect of Different Elevation on Soil Physica-l chemical Properties and Erodibility in Dry-Hot Valley[J]. Bulletin of Soiland Water Conservation, 2011, 30(4): 103-107.
DOI：

LI Peng, LI Zhan-bin, ZHENG Yu. Effect of Different Elevation on Soil Physica-l chemical Properties and Erodibility in Dry-Hot Valley[J]. Bulletin of Soiland Water Conservation, 2011, 30(4): 103-107. DOI：

摘要

以四川省宁南县金沙江下游的河谷地带为研究区域，选择不同海拔下的土壤为研究对象，通过室内测试分析，并运用统计和相关分析等方法，研究不同海拔下的土壤可蚀性变异特征。结果表明，在干热河谷区，海拔对土壤理化性质、机械组成、可蚀性影响显著。在低海拔干热风影响较大的区域，随着海拔的升高，土壤理化性质逐步改善；海拔1 005 m以上地区，干热风影响减弱，土壤理化性质和可蚀性出现转折点，其中理化性质有所降低并趋于稳定，可蚀性显著降低，抗蚀性能显著增强；海拔1 235~1 400 m之间可以作为干热风影响的过渡区，海拔1 500 m以上干热风影响基本消失，植被类型发生变化，土壤可蚀性明显降低，抗蚀性能显著提高。研究结果表明，在金沙江干热河谷区，干热风是影响土壤可蚀性的主要因子之一，因此从水土保持角度出发，在该地区应该尽可能地减少干热风的影响，以提高土地抵抗侵蚀的能力。

Abstract

By sampling soils at different elevation at lower reaches of Jinsha River in Ningnan County

variations of soil erodibility with elevation were studied by statistical analysis and indoor physical-chemical properties analysis.Results indicated that in the dry-hot valley

elevation had significant effect on soil physical chemical properties

particle composition and soil erodibility.In the lower elevation region where dry-hot wind had great effect

both soil physical and chemical properties was improved with the increase of elevation

and soil erodibility decreased too;elevation between 1235 m and 1400 m could be considered as the transition region.When the elevation was over 1500 m

influence of dry-hot wind almost disappeared

vegetation types changed a lot

and soil erodibility decreased significantly.These results verified that in the Jinsha River dry-hot valley

dry-hot wind was one of the main factors that influence the soil erodibility.Thus it was important to adopt proper measures to reduce the influence o f dry-hot wind

and increase the anti erodibility of land by soil and water conservation measures.

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