Regulatory mechanism of soil and water conservation measures on understorey erosion in a subtropical hilly region

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-09-27 DOI:10.1016/j.catena.2024.108427

Jieling Wu , Ruibo Zha , Xuan Zha , Yuting Wang

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引用次数: 0

Abstract

Vegetation restoration affects soil erosion by altering near soil-surface characteristics and hydrodynamic mechanisms. However, the regulatory mechanisms of vegetation restoration in reducing soil erosion under forests are not fully clear. Five soil and water conservation measures (SWCM) with different vegetation structures and characteristics were used in the pure forest of Pinus massoniana which included the grass and shrub, grass, grass and shrub + level furrow, grass, shrub and trees and grass + fish-scale pits, to analyze the impact of vegetation restoration on near soil-surface characteristics and soil erosion. The data were analyzed using Structural Equation Modeling (SEM) to find the key indicators affecting soil erosion under forest. The findings revealed that, as opposed to the control plots (CK), there were significant alterations in the near soil-surface attribute following the application of SWCM. These changes were characterized by an increase in soil porosity, soil water content, soil nutrient content, root biomass, litter, and vegetation cover, and a decrease in soil compaction, disintegration coefficient, and bulk density, with the most significant improvement occurring in 0–10 cm soil layer. The SWCM significantly reduced soil erosion, with runoff and soil loss reduction ranging from 60.46 % to 74.09 % and 67.62 % to 79.99 %, respectively. Structural equation models revealed the influence of SWCM on soil erosion. Specifically, soil water content and litter had a favourable influence on reducing soil erosion, root biomass had a direct positive impact on soil erosion, and vegetation cover directly leads to a reduction in soil erosion. Soil physical properties primarily influenced soil erosion through their effect on vegetation cover. Combining bioengineering and vegetation measures is superior at enhancing soil structure, improving nutrient content, and decreasing soil erosion compared to single vegetation measures. It is recommended to combine bioengineering with vegetation strategies to effectively curb understory forest erosion and enhance soil quality in pine forests.

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亚热带丘陵地区水土保持措施对林下侵蚀的调节机制

植被恢复通过改变近土壤表面特征和水动力机制来影响土壤侵蚀。然而，植被恢复对减少林下水土流失的调节机制尚不完全清楚。在马尾松纯林中采用了五种不同植被结构和特征的水土保持措施（SWCM），包括草灌木、草、草灌木+平沟、草、灌木和乔木以及草+鱼鳞坑，分析植被恢复对近地表特征和土壤侵蚀的影响。采用结构方程模型（SEM）对数据进行分析，找出影响林下土壤侵蚀的关键指标。研究结果表明，与对照地块（CK）相比，施用 SWCM 后，近地表土壤特性发生了显著变化。这些变化的特点是土壤孔隙度、土壤含水量、土壤养分含量、根系生物量、枯落物和植被覆盖度增加，土壤紧实度、崩解系数和容重降低，其中 0-10 厘米土层的改善最为显著。SWCM 能明显减少土壤侵蚀，径流和土壤流失量分别减少了 60.46 % 至 74.09 % 和 67.62 % 至 79.99 %。结构方程模型揭示了 SWCM 对土壤侵蚀的影响。具体而言，土壤含水量和枯落物对减少土壤侵蚀有有利影响，根系生物量对土壤侵蚀有直接的积极影响，植被覆盖直接导致土壤侵蚀的减少。土壤物理特性主要通过对植被覆盖的影响来影响土壤侵蚀。与单一的植被措施相比，生物工程与植被措施相结合在增强土壤结构、提高养分含量和减少土壤侵蚀方面更具优势。建议将生物工程与植被策略相结合，以有效遏制林下侵蚀，提高松林的土壤质量。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.