Change Characteristics of Soil Nutrient in Eroded Topsoil of Purple Soil Sloping Farmland

WANG Ronghao; SHI Dongmei; YU Yali; XIA Rui; NI Shuhui; ZHANG Jianle

doi:10.13870/j.cnki.stbcxb.2023.01.010

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Change Characteristics of Soil Nutrient in Eroded Topsoil of Purple Soil Sloping Farmland

更新时间：2025-03-12

- Change Characteristics of Soil Nutrient in Eroded Topsoil of Purple Soil Sloping Farmland
- Vol. 37, Issue 1, Pages: 65-70(2023)
- 作者机构：
  
  1. 西南大学资源环境学院,重庆,400715
  2. 重庆市水利电力建筑勘测设计研究院,重庆,400020
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.01.010
  CLC： S158.3
- Published：2023
- 稿件说明：
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WANG Ronghao, SHI Dongmei, YU Yali, et al. Change Characteristics of Soil Nutrient in Eroded Topsoil of Purple Soil Sloping Farmland[J]. 2023, 37(1): 65-70.
DOI：

WANG Ronghao, SHI Dongmei, YU Yali, et al. Change Characteristics of Soil Nutrient in Eroded Topsoil of Purple Soil Sloping Farmland[J]. 2023, 37(1): 65-70. DOI： 10.13870/j.cnki.stbcxb.2023.01.010.

摘要

通过设置侵蚀模拟小区

研究紫色土坡耕地耕层质量退化过程中土壤养分的变化特征。以三峡库区紫色土坡耕地侵蚀耕层土壤为研究对象

基于铲土侵蚀模拟法建立5种侵蚀程度(0

20 cm)和2种管理措施的原位试验

采用田间原位检测、土壤化学性质分析等手段

对常规耕作侵蚀耕层土壤养分的恢复效应和土壤养分的年际变化趋势进行研究。结果表明:(1)耕层土壤养分各项指标均表现为F＞CK

表明F较CK改善土壤养分效果较好

且对有机质、全氮和有效磷改善效果明显。(2)紫色土坡耕地耕层土壤养分主要富集在0—20 cm表土层

整体随侵蚀程度加剧

随剖面呈下降的趋势

F下0—30 cm土层土壤养分含量增加明显

对10—20 cm土层有机质含量增幅效果最优。(3)经过连续4年的定位试验

CK下有机质、全钾、碱解氮、有效磷、速效钾含量较背景值增长4.33%~15.89%

全氮含量较背景值无明显变化

全磷含量较背景值降低11.78%;F土壤养分含量较背景值增长4.51%~49.46%。研究成果可为坡耕地合理耕层调控途径、提高土地生产力提供基础参数。

Abstract

By setting up erosion simulation plots

the change characteristics of soil nutrients in the process of quality degradation of the cultivated layer of purple soil sloping farmland were studied. In this paper

taking purple soil slope cultivated land in the Three Gorges Reservoir area as the research object

five erosion degrees (0

15 and 20 cm) and two management measures (no fertilization (CK) and conventional tillage (F)) in situ experiments

using field in situ detection

soil chemical property analysis and other means were used to study the restoration effect of conventional tillage on soil nutrients in eroded topsoil and the interannual variation trend of soil nutrients. The results showed that: (1) All indicators of soil nutrients in the topsoil showed that F>CK

indicating that F was better than CK in improving soil nutrients

and it had a better effect on soil nutrients. The improvement effect of organic matter

total nitrogen and available phosphorus was obvious. (2) The soil nutrients of the arable layer of the purple soil slope farmland were mainly enriched in the topsoil layer of 0—20 cm. The soil nutrient content in the 30 cm soil layer increased significantly

and the effect on the increase of the organic matter content in the 10—20 cm soil layer was the best. (3) After a continuous 4 years positioning test

the organic matter

total potassium

alkali-hydrolyzed nitrogen

available phosphorus

and available potassium increased by 4.33%~15.89% under CK compared with the background value

the total nitrogen content did not change significantly compared with the background value

and the total phosphorus content decreased by 11.78% compared with the background value; the F soil nutrient increased by 4.51%~49.46% compared with the background value. The results provide basic parameters for the regulation of the plough layer and the improvement of land productivity.

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