黄土丘陵区刺槐林土壤团聚体稳定性和土壤可蚀性动态变化

范家伟; 朱广宇; 上官周平; 邓蕾

doi:10.13870/j.cnki.stbcxb.2023.03.003

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黄土丘陵区刺槐林土壤团聚体稳定性和土壤可蚀性动态变化

更新时间：2025-03-12

- 黄土丘陵区刺槐林土壤团聚体稳定性和土壤可蚀性动态变化
- Dynamics Changes of Soil Aggregate Stability and Soil Erodibility of
- 水土保持学报 2023年37卷第3期页码：19-26
- 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. 重庆大学环境与生态学院,重庆,400044
  3. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
  
  [ "范家伟(1996—),男,硕士研究生,主要从事植被恢复的生态效应研究。E-mail:fanjiawei369@163.com" ]
- 基金信息：
  
  中国科学院战略性先导科技专项A类(XDA23070201)
- DOI：10.13870/j.cnki.stbcxb.2023.03.003
  中图分类号： S157.2
- 纸质出版：2023
- 稿件说明：
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范家伟, 朱广宇, 上官周平, 等. 黄土丘陵区刺槐林土壤团聚体稳定性和土壤可蚀性动态变化[J]. 水土保持学报, 2023,37(3):19-26.

FAN Jiawei, ZHU Guangyu, SHANGGUAN Zhouping, et al. Dynamics Changes of Soil Aggregate Stability and Soil Erodibility of[J]. 2023, 37(3): 19-26.
范家伟, 朱广宇, 上官周平, 等. 黄土丘陵区刺槐林土壤团聚体稳定性和土壤可蚀性动态变化[J]. 水土保持学报, 2023,37(3):19-26. DOI： 10.13870/j.cnki.stbcxb.2023.03.003.

FAN Jiawei, ZHU Guangyu, SHANGGUAN Zhouping, et al. Dynamics Changes of Soil Aggregate Stability and Soil Erodibility of[J]. 2023, 37(3): 19-26. DOI： 10.13870/j.cnki.stbcxb.2023.03.003.

摘要

退耕还林工程是黄土高原控制水土流失的主要措施之一

探讨退耕还林对土壤团聚体稳定性与土壤可蚀性的影响

可为黄土高原地区生态恢复和水土保持效益评价提供科学依据。以农田为对照

选取不同退耕年限(5

30年)刺槐林为研究对象

研究退耕还林后0—30 cm土层土壤团聚体稳定性和土壤可蚀性动态变化

并探讨土壤可蚀性与土壤团聚体稳定性之间的关系。结果表明:(1)＞0.25 mm水稳性团聚体含量、平均重量直径、几何平均直径随着退耕年限增加呈递增趋势

三者相比退耕前(农田)分别增加32%~79%

32%~98%

2%~60%。(2)土壤团聚体分形维数随着退耕年限增加呈递减趋势

较退耕前减少0.6%~6.0%;土壤有机质随着退耕年限增加呈递增趋势

较退耕前增加8.4%~38.9%。(3)土壤可蚀性因子(K)随着土层增加而增加

但随退耕年限增加呈递减趋势

随退耕年限递增(K)分别减少1.0%

2.7%

3.6%

3.9%

5.0%

7.9%。(4)退耕还林后

＞0.25 mm水稳性团聚体含量和土壤团聚体分形维数是土壤可蚀性变化的主要驱动因子; 地上生物量通过影响＞0.25 mm水稳性团聚体含量和土壤团聚体分形维数间接影响土壤可蚀性因子(K)

且总效应最大。退耕还林后地上生物量增加对土壤团聚体的形成与稳定

以及土壤可蚀性降低起着重要作用

且退耕还林可显著提高团聚体稳定性

降低土壤可蚀性。

Abstract

“Grain for Green” Project is one of the main measures to control soil and water loss on the Loess Plateau. Discussing the impact of returning farmlands to forests on the stability of soil aggregates and soil erodibility could provide a scientific basis for ecological restoration and benefit evaluation of soil and water conservation on the Loess Plateau. In this study

the Robinia pseudoacacia L. forests with different planting years (5 years

10 years

15 years

20 years

25 years and 30 years) were selected as the research object

and the farmland was used as the control to study the dynamic changes of soil aggregate stability and soil erodibility in 0-30 cm soil layers after returning farmlands to forests

and the study also explored the relationship between soil erodibility and soil aggregate stability. The results showed that: (1) The content

mean weight diameter and geometric mean diameter (GMD) of water-stable aggregates＞0.25 mm increased with the increasing of planting years

which increased by 32%~79%

32%~98% and 2%~60%

respectively

compared with that of farmland. (2) The fractal dimension of soil aggregates decreased with the increasing of restoration ages

which decreased by 0.6%~6.0% compared with that of before returning farmland. Soil organic matter increased with the increasing of restoration ages

increased by 8.4%~38.9% compared with that of farmlands. (3) Soil erodibility factor K increased with the increasing of soil layer

but decreased gradually with the increasing of restoration ages

and decreased by 1.0%

2.7%

3.6%

3.9%

5.0% and 7.9%

respectively

with the increasing of restoration ages. (4) After the conversion of farmland to forest

the fractal dimension of soil aggregates and the content of water-stable aggregates＞0.25 mm were the main driving factors for the change of soil erodibility. The aboveground biomass indirectly affected soil erodibility through affecting the fractal dimension of soil aggregates and the content of water-stable aggregates＞0.25 mm

and the total effect was the largest. The study suggested that the increase of soil aboveground biomass after returning farmlands to forests played an important role in the formation and stability of soil aggregates and the reduction of soil erodibility

and returning farmlands to forests significantly improved the stability of aggregates and reduced soil erodibility.

关键词

Keywords

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