生态环境学报2026，Vol.35Issue(3)：425-436,12.DOI:10.16258/j.cnki.1674-5906.2026.03.009
小球藻对广东红壤团聚体水稳性及其胞外聚合物组分的影响
Effects of Chlorella Vulgaris on Water Stability of Soil Aggregates and Extracellular Polymeric Substance Components in Red Soils of Guangdong
摘要
Abstract
Due to long-term exposure to high temperatures and heavy rainfall,lateritic soils in South China exhibit poor soil structure,characterized by acidity,high clay content,and low fertility.Among these issues,the poor water stability of soil aggregates represents the core problem of lateritic soil structural degradation.Chlorella,as a sustainable,pollution-free,and highly efficient biological soil amendment,has attracted considerable attention from researchers in recent years.This study utilized lateritic red loam and latosol as test soils and conducted laboratory incubation experiments to investigate the regulatory mechanisms of Chlorella on aggregate water stability and extracellular polymeric substances(EPS)in these two lateritic soil types from Guangdong Province.The results demonstrated that the application of active Chlorella significantly enhanced aggregate water stability in both soil types.Compared with the control group,the mean mass diameter(MMD)in the high-application treatment group(Z3)increased by 44.0%and 21.9%for lateritic red loam and latosol,respectively,while the geometric mean diameter(GMD)increased by 41.8%and 40.6%,respectively.Additionally,the proportion of water-stable aggregates with particle size>0.25 mm(R0.25)increased by 12.6%and 21.6%,respectively.The inactivated treatment group exhibited unstable aggregate improvement effects due to the loss of metabolic activity in Chlorella.Soil EPS content displayed a dose-dependent response,with the active treatment group showing a 49.7%increase in EPS content in latosol compared to the control.The differential effects between active and inactivated Chlorella treatments indicate that biological activity is the key factor for long-term regulation by Chlorella.Correlation analysis revealed significant positive correlations between aggregate stability and both soil fertility properties and ecological environment characteristics.This study confirms that microalgae can enhance lateritic soil structural stability through the synergistic effects of metabolic EPS secretion and improvement of the soil microenvironment,providing a novel biological regulatory strategy for ecological restoration of degraded lateritic soils in subtropical regions.关键词
砖红壤/赤红壤/小球藻/土壤团聚体/胞外聚合物Key words
latosol/lateritic red loam/Chlorella/soil aggregates/extracellular polymeric substances分类
农业科技引用本文复制引用
黄绍强,江恒,余世钦,蒋新宇,程炯,陈三雄..小球藻对广东红壤团聚体水稳性及其胞外聚合物组分的影响[J].生态环境学报,2026,35(3):425-436,12.基金项目
广东省重点领域研发计划项目(2022B0111130003) （2022B0111130003）
广东省基础与应用基础研究基金项目(2025A1515010758) （2025A1515010758）
广东省科学院发展专项资金(2020GDASYL-20200103084 （）
2023GDASZH-2023010103) （）
广东省水利科技创新项目(2024-02) （2024-02）
