Effects of Tillage and Weeding on Nitrogen and Phosphorus Losses of Purple Soil at Different Slope Lengths

LIANG Ke; HE Xiaorong; HE Binghui; LI Tianyang; DU Yingni

doi:10.13870/j.cnki.stbcxb.2020.04.002

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Effects of Tillage and Weeding on Nitrogen and Phosphorus Losses of Purple Soil at Different Slope Lengths

更新时间：2025-03-12

- Effects of Tillage and Weeding on Nitrogen and Phosphorus Losses of Purple Soil at Different Slope Lengths
- Vol. 34, Issue 4, Pages: 7-13(2020)
- 作者机构：
  
  1. 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室,重庆,400715
  2. 重庆市璧山区水土保持监测站,重庆,402760
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.04.002
  CLC：
- Published：2020
- 稿件说明：
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LIANG Ke, HE Xiaorong, HE Binghui, et al. Effects of Tillage and Weeding on Nitrogen and Phosphorus Losses of Purple Soil at Different Slope Lengths[J]. 2020, 34(4): 7-13.
DOI：

LIANG Ke, HE Xiaorong, HE Binghui, et al. Effects of Tillage and Weeding on Nitrogen and Phosphorus Losses of Purple Soil at Different Slope Lengths[J]. 2020, 34(4): 7-13. DOI： 10.13870/j.cnki.stbcxb.2020.04.002.

摘要

为揭示自然降雨下翻耕除草和坡长对紫色土氮、磷流失的影响，通过野外设置径流小区（2个坡面：翻耕除草与自然恢复；3种坡长：20，40，60 m，共9个小区），定位监测研究不同处理下产流产沙及氮、磷流失特征。结果表明，同一坡面不同坡长间产流产沙差异不显著（P>0.05）；同一坡长不同坡面处理小区的径流量、产沙量差异极显著（P<0.01）。与翻耕除草相比，自然恢复坡面20，40，60 m坡长小区径流量分别减少77.55%，62.62%，79.56%，产沙量分别减少85.21%，94.97%，96.25%。仅在40 m坡长下，不同坡面处理径流中DN、DP流失量差异不显著（P>0.05），其他坡长DN、DP流失量差异显著（P<0.05）；各坡长不同坡面处理下泥沙中TN、TP流失量差异极显著（P<0.01）。与翻耕除草相比，自然恢复坡面处理径流中DN、DP流失量分别减少75.13%，80.22%，泥沙中TN、TP流失量分别减少96.07%，96.38%。在翻耕除草坡面处理下，降雨强度与径流量、产沙量及泥沙中的TN和TP流失量呈极显著幂函数关系；在自然恢复坡面处理下，上述关系均不显著。研究结果可为紫色土氮、磷流失及面源污染防治等提供理论参考依据。

Abstract

To clarify the influences of tillage and weeding and slope length on the losses of nitrogen (N) and phosphorous (P) under natural rainfall in purple soil area

9 plots combined with two land disturbances (tillage and weeding and natural restoration) and three slope lengths (20

and 60 m) were established to compare the runoff and sediment yield

and N and P losses. The results showed that slope length had no remarkable effect on the runoff and sediment yield under the same land condition (P>0.05)

while tillage and weeding plots significantly differed the runoff and sediment yield from natural-restored plots under the same slope length (P<0.01). Natural-restored plots of 20

60 m respectively reduced runoff by 77.55%

62.62%

79.56%

and sediment yield by 85.21%

94.97%

96.25%

compared with the tillage and weeding plots. There were significant effects of land disturbance on runoff-related DN and DP losses under 20 and 60 m plots (P<0.05) and on sediment-related TN and TP losses across all plot lengths (P<0.01). Natural-restored plots could reduce the losses of DN and DP in runoff by 75.13% and 80.22%

and the losses of TN and TP in sediment by 96.07% and 96.38%

respectively. Rainfall intensity had significantly power relationship with runoff and sediment yield

and TN and TP losses with sediment-related under tillage and weeding plots

but there was no significant relationship under natural-restored plots. The results can provide theoretical reference for N and P losses and non-point source pollution control in the purple soil area.

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