Simulation of Runoff-sediment-nutrient Loss on Loess Vegetated Sloping Land Under the Coupling Effect of Multi-factors

GAO Shuang; WU Lei; CHI Yubo; LI Rui

doi:10.13870/j.cnki.stbcxb.2020.04.016

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Simulation of Runoff-sediment-nutrient Loss on Loess Vegetated Sloping Land Under the Coupling Effect of Multi-factors

更新时间：2025-03-12

- Simulation of Runoff-sediment-nutrient Loss on Loess Vegetated Sloping Land Under the Coupling Effect of Multi-factors
- Vol. 34, Issue 4, Pages: 104-111(2020)
- 作者机构：
  
  1. 西北农林科技大学旱区农业水土工程教育部重点实验室, 陕西杨凌,712100
  2. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
  3. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.04.016
  CLC：
- Published：2020
- 稿件说明：
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GAO Shuang, WU Lei, CHI Yubo, et al. Simulation of Runoff-sediment-nutrient Loss on Loess Vegetated Sloping Land Under the Coupling Effect of Multi-factors[J]. 2020, 34(4): 104-111.
DOI：

GAO Shuang, WU Lei, CHI Yubo, et al. Simulation of Runoff-sediment-nutrient Loss on Loess Vegetated Sloping Land Under the Coupling Effect of Multi-factors[J]. 2020, 34(4): 104-111. DOI： 10.13870/j.cnki.stbcxb.2020.04.016.

摘要

采用人工模拟降雨试验研究不同雨强（60，90，120 mm/h）、不同坡度（10°，15°，20°）、不同生物炭含量（0，3%，6%）等多因素耦合作用下黄土植被坡面水沙及养分流失规律。结果表明：（1）水沙及PO43-—P的流失随着雨强的增大而增大，NO3-—N随雨强的增大呈先上升后下降的趋势，径流及氮磷与坡度的规律性不明显，雨强坡度与k值（产沙速率系数）变化率的线性关系中，雨强的影响较大。（2）产流产沙过程相似，均随降雨历时先上升后趋于平稳，NO3-—N与降雨历时呈幂函数关系，PO43-—P在流失过程中最大浓度与最小浓度比为1~2，且在侵蚀产沙及NO3-—N的流失过程中，雨强与生物炭相关性极显著。（3）生物炭含量≥3%会增加侵蚀产沙及PO43-—P的流失，雨强为60，90 mm/h时，NO3-—N流失量随生物炭的增多呈先减小后增大的趋势，雨强为120 mm/h时，NO3-—N流失量随生物炭添加量的增大呈上升趋势。研究结果可以为黄土丘陵沟壑区水土资源管理提供科学的指导。

Abstract

The simulated rainfall experiments were conducted to explore the loss rules of runoff

sediment

and nutrient on the loess vegetated sloping land under the coupling effects of different rainfall intensity (60 mm/h

90 mm/h

120 mm/h)

slope (10°

15°

20°)

and biochar content (0

6%).The results showed that: (1) The loss of runoff

sediment

and PO43-—P increases with the increase of rainfall intensity

and NO3-—N increases firstly and then decreases with the increase of rainfall intensity. The rules of runoff

nitrogen

and phosphorus with slope were not obvious. The influence of rainfall intensity was greater in the linear relationship between the rainfall intensity

slope

and the changing rate of k value (sediment yield rate coefficient). (2) The processes of runoff and sediment yield were similar

they both first rose and then stabilized with the progress of rainfall. The NO3-—N had a power function relationship with the rainfall duration. The ratio of the maximum concentration to the minimum concentration of PO43-—P during loss was between 1 and 2. In the process of sediment yield and NO3-—N loss

the correlation between rainfall intensity and biochar was extremely significant. (3) The increase of biochar content (≥3%) could increase the sediment yield and loss of PO43-—P. When the rainfall intensity was 60 mm/h and 90 mm/h

the amount of NO3-—N loss decreased firstly and then increased with the increase of biochar content. When the rainfall intensity was 120 mm/h

the amount of NO3-—N loss depended on the amount of added biochar. The results can provide scientific guidance for the management of soil and water resources in the loess hilly and gully region.

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