Does the returning farmland to grassland (retiring grassland) improve the soil aggregate stability in erosion and deposition sites?

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-04-13 DOI:10.1016/j.catena.2025.109023

Wuyi Li , Yuanyue Xia , Xiaohong Tan , Fengling Gan , Lisha Jiang , Xiuying Xu , Youjin Yan , Yuchuan Fan , Junbing Pu

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Abstract

Soil aggregate stability is considered one of the key parameters that reflect soil structure and quality, which is significantly influenced by soil erosion after returning farmland to grassland (retiring grassland). However, the responses of soil aggregate stability to retiring grassland at erosion and deposition sites remain unclear, especially the complex geological background of karst trough valley. Thus, soil samples were collected from erosion (dip/anti-dip slopes) and deposition sites under retiring grassland and farmland in karst trough valley. The results revealed that the bulk density (BD), total nitrogen (TN), and mean weight diameter (MWD) were significantly lower at erosion sites compared to deposition sites (P < 0.05). Compared with those in the farmland, the soil organic carbon (SOC), macroaggregate (> 0.25 mm) proportions, and MWD of the retiring increased significantly, by 31.78 %, 65.86 %, and 204.69 %, respectively. In addition, SOC, TN, and total phosphorus (TP) at erosion sites were significantly positively correlated with soil aggregate stability (P < 0.05). The partial least path model (PLS-PM) revealed that erosion and deposition sites and retiring grassland significantly affected soil aggregate stability. This study refers to the “Grain for Green” project under the context of karst rocky desertification and elucidates changes in soil aggregate stability caused by changes in soil physicochemical properties and aggregates in retiring grassland at erosion and deposition sites of karst trough valley.

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退耕还草是否改善了侵蚀淤积区土壤团聚体稳定性？

土壤团聚体稳定性是反映土壤结构和质量的关键参数之一，退耕还草后土壤侵蚀对土壤团聚体稳定性影响显著。然而，土壤团聚体稳定性对侵蚀淤积地退耕草地的响应尚不清楚，特别是在岩溶槽谷复杂的地质背景下。因此，在喀斯特槽谷退耕草地和农田下的侵蚀（倾斜/反倾斜斜坡）和沉积场地采集土壤样品。结果表明，侵蚀区土壤容重（BD）、总氮（TN）和平均重径（MWD）显著低于沉积区(P <；0.05)。与农田相比，土壤有机碳（SOC）、宏观团聚体(>；0.25 mm)的比例显著提高，离层钻速分别提高了31.78%、65.86%和204.69%。土壤有机碳（SOC）、全氮（TN）和全磷（TP）与土壤团聚体稳定性(P <；0.05)。偏最小路径模型（PLS-PM）表明，侵蚀淤积场地和退耕草地对土壤团聚体稳定性有显著影响。本研究以喀斯特石漠化背景下的“退耕还林”工程为研究对象，阐述了喀斯特槽谷侵蚀淤积地退耕草地土壤理化性质和团聚体变化对土壤团聚体稳定性的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.