Effects of Rainfall Intensity and Land Use on Organic Matter Loss in Southwest Coteau of He'nan Province

LI Zhongyuan; WANG Guozhong; QU Jiangang; XU Jianzhao; YAN Dongfeng

doi:10.13961/j.cnki.stbctb.2017.01.005

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Effects of Rainfall Intensity and Land Use on Organic Matter Loss in Southwest Coteau of He'nan Province

- Effects of Rainfall Intensity and Land Use on Organic Matter Loss in Southwest Coteau of He'nan Province
- Bulletin of Soiland Water Conservation Vol. 37, Issue 1, Pages: 29-33(2017)
- 作者机构：
  
  1. 河南省水文水资源局,河南,郑州,450003
  2. 黄河水文水资源科学研究院,河南,郑州,450004
  3. 河南省水土保持监督监测总站,河南,郑州,450008
  4. 河南农业大学林学院,河南,郑州,450002
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2017.01.005
  CLC：
- Published：2017
- 稿件说明：
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LI Zhongyuan, WANG Guozhong, QU Jiangang, et al. Effects of Rainfall Intensity and Land Use on Organic Matter Loss in Southwest Coteau of He'nan Province[J]. Bulletin of Soiland Water Conservation, 2017, 37(1): 29-33.
DOI：

LI Zhongyuan, WANG Guozhong, QU Jiangang, et al. Effects of Rainfall Intensity and Land Use on Organic Matter Loss in Southwest Coteau of He'nan Province[J]. Bulletin of Soiland Water Conservation, 2017, 37(1): 29-33. DOI： 10.13961/j.cnki.stbctb.2017.01.005.

摘要

[目的] 研究丹江口水库水源区不同降雨强度和土地利用方式对土壤中有机质流失的影响，为该区域的面源污染和水土流失防治提供依据。[方法] 通过人工模拟降雨试验，以豫西南山区5种常见土地类型的表层土壤为研究对象，应用双因素方差分析，研究雨强和土地利用方式对土壤中有机质的影响。[结果] 雨强对径流中有机质的流失影响显著，雨强越大流失量也越大，而土地类型对其影响不大；泥沙中的有机质流失量受雨强和土地类型的影响均显著，随雨强增加而增大；农用地（梯田和坡耕地）中随泥沙流失的有机质含量较高，林草地则低；分别对径流和流失泥沙中的有机质含量与雨强作回归分析，均显示出多项式拟合效果最好（除灌草地的泥沙拟合外）。[结论] 梯田作为一种水保措施，能够保持养分和水土流失，因此其土壤中富集的养分也最多；林草地土壤结构较好，能够减缓土壤侵蚀，因而流失的养分也较少。

Abstract

[Objective] The objective of this study is to analyze the effects of rainfall intensity and land use on loss of organic matter in southwest coteau in Danjiangkou reservoir catchment and to provide help for preventing and controlling non-point source pollution and soil erosion of the region. [Methods] Artificial rainfall experiments

two-factor variance analysis method was adopted to investigate nutrient loss in different land use types in Danjiangkou reservoir catchment and the topsoil samples were collected from five common land use types to analyze the organic matter under six levels of rainfall intensity. [Results] (1) The rainfall intensity had significant effects on the loss of organic matter in runoff while land use types had little impact on it

the higher the rainfall intensity is

the more the organic matter loss. (2) Both rainfall intensity and land types had obvious influence on the organic matter content in sediment

increasing with the increase of rainfall intensity. The organic matter content in the sediment from farmland (terraces and hilly land) was higher than that from forest and grass land

which indicated the better effects of soil and water conservation of forest and grass land. (3) The regression analysis between the organic matter content in runoff and sediment with rainfall intensity showed that polynomial fitting gives best performance(except sediment fitting of shrubby grassland). [Conclusion] The most nutrients were rich in terraces soil

which could keep the nutrients and soil as a kind of soil conservation measures. Less nutrients were lost in woodland and grassland because of their better soil structure

which could reduce nutrient loss and soil erosion.

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