侵蚀地貌中土壤团聚体碳、氮、磷含量变化及其环境风险

乔林明; 韩慧; 贺高航; 王润泽; 王蕊; 郭胜利

doi:10.13870/j.cnki.stbcxb.2022.03.038

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侵蚀地貌中土壤团聚体碳、氮、磷含量变化及其环境风险

更新时间：2026-04-09

- 侵蚀地貌中土壤团聚体碳、氮、磷含量变化及其环境风险
- Changes of C, N, P Contents in Soil Aggregates and Their Environmental Risk Across Eroded Landforms
- 水土保持学报 2022年36卷第3期页码：267-273
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 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
  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：
  
  [ "乔林明(1996-),男,硕士研究生,主要从事水土保持与土壤生态研究。E-mail:2546785250@qq.com" ]
- 基金信息：
  
  国家自然科学基金项目(42107360);中央高校基本科研业务费项目(2452021032)
- DOI：10.13870/j.cnki.stbcxb.2022.03.038
  中图分类号： S151.9
- 网络首发：2022-05-27，
  
  纸质出版：2022
- 稿件说明：
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乔林明, 韩慧, 贺高航, 等. 侵蚀地貌中土壤团聚体碳、氮、磷含量变化及其环境风险[J]. 水土保持学报, 2022,36(3):267-273.

QIAO Linming, HAN Hui, HE Gaohang, et al. Changes of C, N, P Contents in Soil Aggregates and Their Environmental Risk Across Eroded Landforms[J]. 2022, 36(3): 267-273.
乔林明, 韩慧, 贺高航, 等. 侵蚀地貌中土壤团聚体碳、氮、磷含量变化及其环境风险[J]. 水土保持学报, 2022,36(3):267-273. DOI： 10.13870/j.cnki.stbcxb.2022.03.038.

QIAO Linming, HAN Hui, HE Gaohang, et al. Changes of C, N, P Contents in Soil Aggregates and Their Environmental Risk Across Eroded Landforms[J]. 2022, 36(3): 267-273. DOI： 10.13870/j.cnki.stbcxb.2022.03.038.

摘要

为明确侵蚀环境中长期施用化肥条件下农田土壤养分积累特征及其对流域面源污染的潜在威胁。在高塬沟壑区

分别采集塬面—坡地—沟道和川地—河漫滩—河道中土壤及泥沙样品

分析不同侵蚀地貌单元中团聚体粒级分布特征和不同团聚体中C、N、P含量变化及其潜在环境风险。结果表明:(1)沟道和河道等低洼地带＜63 μm粒级团聚体占比最高

川地—河漫滩—河道系统中＜63 μm粒径含量显著高于塬面—坡地—沟道系统;(2)塬面有机碳(SOC)、全氮(TN)、全磷(TP)、有效磷(Olsen—P)含量分别为8.49

1.19

1.23 g/kg和51.80 mg/kg

是80年代初的1.39

1.49

1.76

16.27倍;川地分别为6.80

1.00

1.07 g/kg和27.40 mg/kg

是80年代初的1.12

1.25

1.52

8.13倍

磷素积累最为明显。各粒级团聚体中SOC、TN、TP、Olsen—P含量由高到低依次为＞250 μm粒级

63~250 μm粒级

＜63 μm粒级;(3)无论是从塬面到沟道

还是从川地到河道

不同粒级团聚体中SOC、TN、TP、Olsen—P都呈现了显著降低趋势

但沟道和河道＜63 μm粒级团聚体中有效磷素含量已升高到塬面上世纪80年代初水平。易侵蚀迁移的团聚体(＜250 μm)分布特征和CaCl2—P的突变点问题突出

成为塬面和川地农田土壤养分积累影响水体环境的潜在风险源。因此

防治水土流失和改善施肥措施是确保黄河流域高质量发展的基础。

Abstract

This study aimed to clarify the characteristics of soil nutrient accumulation and the potential risk to non-point pollution in the basin under eroded environment and long-term fertilizer application on farmland. In table-gully region of the Loess Plateau

soil and sediment samples were collected to analyze the size distribution and C

P contents in aggregates and the potential environmental risks in different erosion landforms from Tableland-Slope-Gully system (TSG) and Flatland-Washland-Waterstead system (FWW). The results showed that:(1) The highest weight percentage of small aggregate (< 63 μm) was found in low-lying areas

such as gully and waterstead

and FWW system was significantly higher than TSG system. (2) The contents of SOC

Olsen-P in Tableland were 8.49

1.19

1.23 g/kg and 51.80 mg/kg

respectively

which were 1.39

1.49

1.76 and 16.27 times of the recorded in the early 1980s; and 6.80 g/kg

1.00 g/kg

1.07 g/kg

27.40 mg/kg for Flatland

respectively

which were 1.12

1.25

1.52 and 8.13 times of the recorded in the early 1980s. Moreover

soil phosphorus was accumulated most significantly among all soil nutrients. The SOC

Olsen-P contents in different aggregates showed the same decreasing pattern as follow > 250

63~250

< 63 μm. (3) The SOC

Olsen-P were significantly reduced along the erosion topographic units under TSG and FWR systems; additionally

soil phosphorus contents in 63 μm aggregate at gully and waterstead plots increased to the value of tableland in the early 1980s. The characteristics of aggregates (< 250 μm) distribution and the mutation point of CaCl2-P were prominent

and became the potential risk source for the water environment effected by the accumulation of soil nutrients under TSG and FWR systems. Therefore

preventing soil erosion and improving fertilization measures are the basis for ensuring high-quality development of the Yellow River basin.

关键词

Keywords

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