Comparison of Particle Composition and Nutrient Contents in Sediment Between Two Typical Shrub Lands in the Loess Hilly Area

ZHANG Guan-hua; LIU Guo-bin; WANG Guo-liang; YI Liang

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Comparison of Particle Composition and Nutrient Contents in Sediment Between Two Typical Shrub Lands in the Loess Hilly Area

- Comparison of Particle Composition and Nutrient Contents in Sediment Between Two Typical Shrub Lands in the Loess Hilly Area
- Bulletin of Soiland Water Conservation Vol. 28, Issue 1, Pages: 1-6(2009)
- 作者机构：
  
  1. 西北农林科技大学资源环境学院, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2009
- 稿件说明：
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ZHANG Guan-hua, LIU Guo-bin, WANG Guo-liang, et al. Comparison of Particle Composition and Nutrient Contents in Sediment Between Two Typical Shrub Lands in the Loess Hilly Area[J]. Bulletin of Soiland Water Conservation, 2009, 28(1): 1-6.
DOI：

ZHANG Guan-hua, LIU Guo-bin, WANG Guo-liang, et al. Comparison of Particle Composition and Nutrient Contents in Sediment Between Two Typical Shrub Lands in the Loess Hilly Area[J]. Bulletin of Soiland Water Conservation, 2009, 28(1): 1-6. DOI：

摘要

在野外模拟降雨条件下

比较研究了黄土丘陵区柠条(Caragana korshinkii)和狼牙刺(Sophora viciifolia)径流小区产流产沙、侵蚀泥沙颗粒组成、比表面积(SSA)及养分流失特征。结果表明

两种灌木群落均能显著减小坡面径流泥沙的流失。产流后流失泥沙黏粒、SSA与养分含量随降雨时间总体呈现降低趋势

其中有机质变化显著

全磷变化不显著。受植被盖度影响

泥沙中黏粒与养分含量均表现为柠条群落>狼牙刺群落>对照裸地。侵蚀泥沙具有富集黏粒和富集养分的特征

富集率随群落盖度增大而增大(柠条>狼牙刺>裸地)。不同形态养分富集率不同

其中有机质均在2.5以上

全氮平均富集率为2.13

全磷为1.23。富集率随产流时间呈线性递减。流失泥沙养分含量与黏粒(粒径<0.002mm)含量及SSA达到极显著的正相关。坡面土壤养分主要以黏粒为载体流失。SSA的变化不仅能体现土壤颗粒组成的变化

而且能够反映土壤养分的变化。

Abstract

Runoff and sediment yield on plot

eroded sediment composition

specific surface area(SSA)

and nutrient loss were investigated under field simulated rainfall for two typical shrubs

Caragana korshinkii.and Sophora viciifolia

in the loess gully area.Results showed that both of shrubs can significantly reduce the loss of runoff and sediment.Clay contents

SSA

and nutrient contents decreased with rainfall duration.The organic matter(OM) contents had significant changes with rainfall duration but total phosphorus(TP) contents did not.Clay and nutrient contents in sediment from the two shrub lands were higher than those from the bare lands(CK)

and clay and nutrient contents from the Caragana korshinkii lands were higher than those from the Sophora viciifolia lands

which may be resulted from the influence of vegetation including above-ground and below-ground parts.In addition

sediment could enrich clay and nutrients

and the enrichment ratios increased with vegetation coverage but decreased linearly with runoff time.The enrichment ratios of OM in all the plots were greater than 2.5

while the averaged enrichment ratios of TN and TP were 2.13 and 1.23

respectively.The nutrient contents in sediment correlated positively with the content of clay particles(less than 0.002mm) and the SSA

because soil nutrients are mainly carried by fine particles.The SSA can embody the changes of particle size distribution and soil nutrients.

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