Effect of Reforestation Tree Species on the Distribution and Stability of Purple Soil Aggregates

ZHONG Yujian; HE Feng; HAN Guangzhong; ZHAO Xia; YANG Fan

doi:10.13870/j.cnki.stbcxb.2024.06.010

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Effect of Reforestation Tree Species on the Distribution and Stability of Purple Soil Aggregates

更新时间：2025-02-18

- Effect of Reforestation Tree Species on the Distribution and Stability of Purple Soil Aggregates
- Vol. 38, Issue 6, Pages: 284-292(2024)
- 作者机构：
  
  1. 青海师范大学地理科学学院青海省自然地理与环境过程重点实验室,西宁,810008
  2. 内江师范学院地理与资源科学学院内江市土壤过程模拟与污染修复工程技术研究中心,四川,内江,641100
  3. 青海省人民政府北京师范大学高原科学与可持续发展研究院-高原土壤信息科学研究团队,西宁,810008
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.06.010
  CLC： S152.4;S714.2
- Published：2024
- 稿件说明：
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ZHONG Yujian, HE Feng, HAN Guangzhong, et al. Effect of Reforestation Tree Species on the Distribution and Stability of Purple Soil Aggregates[J]. 2024, 38(6): 284-292.
DOI：

ZHONG Yujian, HE Feng, HAN Guangzhong, et al. Effect of Reforestation Tree Species on the Distribution and Stability of Purple Soil Aggregates[J]. 2024, 38(6): 284-292. DOI： 10.13870/j.cnki.stbcxb.2024.06.010.

摘要

[目的] 退耕还林是改善土壤结构、减少水土流失的重要举措

明确还林树种对土壤团聚体形成过程的影响机制可为水土保持提供重要的依据。[方法] 选择华西雨屏区紫色土坡耕地(玉米地)还林20年形成的柳杉林、混交林、茶园和慈竹林4种人工林土壤为研究对象

分析土壤团聚体分布及其稳定性的变化。[结果] (1)相较于坡耕地

混交林、茶园和慈竹林土壤>5 mm团聚体含量显著增加

而0.5~1 mm团聚体含量显著减少(p <0.05)

优势团聚体由0.5~1 mm转变为>5 mm;(2)人工林土壤团聚体GMD、MWD和R0.25分别上升46.93%~330.30%

47.01%~191.03%和5.02%~19.66%

而PAD0.25和PSD分别下降15.41%~75.09%和1.65%~9.20%

表明人工林土壤团聚体稳定性增强

具体表现为茶园>慈竹林>混交林>柳杉林

以茶园和慈竹林较优;(3)土壤优势团聚体含量及其稳定性与惰性有机碳含量呈极显著正相关

而与土壤砾石含量呈极显著负相关(p <0.01)。[结论] 林木生长促进紫色土风化

为土壤团聚体形成提供物质基础;人工林土壤形成的腐殖质作为胶结物质

促进大团聚体的形成及其稳定性的维持。

Abstract

[Objective] Afforestation following the Grain for Green initiative is a crucial measure to improve soil structure and reduce soil erosion. Understanding the mechanisms of the effects of afforestation tree species on the formation of soil aggregates can provide valuable insights for soil conservation. [Method] Four types of artificial forests (Cryptomeria fortunei (CF)

Cryptomeria fortunei and Betula luminifera (MF)

Camellia sinensis (CS)

and Neosinocalamus affinis (NA)) established on sloping farmland (SF) (cornfield) in the Rainy Area of Western China after 20 years of afforestation were taken as the research objects

in order to analyze the changes in soil aggregate content and stability after the conversion from farmland to artificial forests. [Results] (1) Compared to the sloping farmland

the artificial forests of MF

and NA significantly increased the soil aggregates >5 mm

but decreasd the 0.5~1 mm soil aggregates (p < 0.05). The dominant soil aggregates shifted from 0.5~1 mm to >5 mm. (2) The soil aggregate parameters

including the geometric mean diameter (GMD)

mean weight diameter (MWD)

and the content of aggregates of >0.25 mm (R0.25)

increased by 46.93%~330.30%

47.01%~191.03% and 5.02%~19.66%

respectively

in the artificial forests. Conversely

the destruction rate (PAD0.25) and fractal dimension (PSD) decreased by 15.41%~75.09% and 1.65%~9.20%

respectively. These indicators of aggregate stability consistently demonstrated that the stability of soil aggregates in the artificial forests was enhanced

with a specific ranking of CS> NA> MF> CF

indicating that CS and NA were both relatively superior. (3) The content and stability of dominant soil aggregates were extremely significantly positively correlated with the content of NOC

and extremely significantly negatively correlated with the content of soil gravel (p < 0.01). [Conclusion] The weathering of purple soil following afforestation provides the material foundation for aggregate formation

while the humus formed in the soil of artificial forests acts as a binding agent

promoting the formation of large aggregates and the maintenance of their stability.

关键词

Keywords

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