Yu Song , Yufei Yao , Weibo Kong , Liangchen Guo , Kaiqiang Bao , Liping Qiu , Mingan Shao , Xiaorong Wei
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引用次数: 0
Abstract
The role of plant in regulating soil carbon cycling is well recognized. However, this regulatory function is increasingly threatened by human-driven vegetation loss and intensified erosion, especially in ecologically fragile ecosystems. Despite their frequent co-occurrence, the interactive effects of these stressors on soil organic carbon (SOC) dynamics remain poorly understood. In this study, we conducted a field experiment on China’s Loess Plateau to investigate the impacts of vegetation loss and soil erosion intensity on soil carbon processes, focusing on enzyme activities and SOC dynamics across landscape position. Our results showed that vegetation removal significantly reduced SOC by 0.63 %, along with declines in enzyme activities. These effects were more pronounced in surface soils (0–10 cm), under moderate erosion intensity (SOC: 1.19 % reduction), and in northern erosion-prone sites such as Suide (SD) in erosion areas. In contrast, deposition zones exhibited comparatively weaker responses in both SOC and enzyme activities following vegetation removal. Vegetation loss altered SOC regulation across geomorphic zones. In erosion areas, the controlling factor shifted from erosion intensity to climate, whereas in depositional zones, the contribution of nutrient stoichiometry became more pronounced . Structural equation modeling revealed contrasting pathways: enzyme suppression drove SOC loss in erosion zones, while nutrient stoichiometry shifts governed SOC in depositional zones. Our findings demonstrated that anthropogenic vegetation loss intensifies erosion-induced SOC loss by shifting its biogeochemical regulation, highlighting the critical need for integrated vegetation restoration and erosion control to stabilize soil carbon in vulnerable landscapes.
期刊介绍:
Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.