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[1]MAO Na,LIU Tong,JIANG Heng,et al.Effects of Earthworms on Grass Regeneration in Lateritic Red Soil[J].Research of Soil and Water Conservation,2023,30(01):70-76,82.[doi:10.13869/j.cnki.rswc.20220304.001]

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Effects of Earthworms on Grass Regeneration in Lateritic Red Soil

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 70-76,82 Column: Public date: 2023-01-10

Title:: Effects of Earthworms on Grass Regeneration in Lateritic Red Soil

Author(s):: MAO Na^1,3, LIU Tong², JIANG Heng², LI Xiangdong^1,2, CHENG Jiong², WEI Xiaorong¹, SHAO Ming'an¹; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi 712100, China; 2.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil......)

Keywords:: lateritic red soil; earthworm; drought; ryegrass; nutrient cycling

CLC:: S158

DOI:: 10.13869/j.cnki.rswc.20220304.001

Abstract:: Ecological restoration is one of the effective measures to control land degradation in the red soil hilly region of south China. However, few studies have focused on the role of soil fauna in ecological restoration. In this study, a full-factor pot experiment, two ecosystems(bare soil vs. ryegrass)× earthworm(no inoculation vs. earthworm inoculation)× moisture(wet vs. drought), was used to reveal the regulatory effects of earthworms on soil physicochemical properties and vegetation productivity before and after the restoration of degraded soil under the drought stress. The results showed as follows. Earthworms significantly increased the biomass of ryegrass under different soil moisture conditions. Earthworm did not influence soil organic carbon, but increased soil total nitrogen, nitrate-nitrogen, ammonium-nitrogen in the bare soil ecosystem and the soil available phosphorus in the ryegrass ecosystem(p<0.05). Drought decreased the biomass of ryegrass and had no significant effect on soil pH, but significantly increased the soil pH of earthworm presence soil. The biomass of ryegrass was significantly positively correlated with soil total phosphorus, nitrate-nitrogen, ammonium-nitrogen and available phosphorus(p<0.05). Partial least square path analysis showed that earthworm significantly increased soil total and available nutrient contents, and soil available nutrients had a significant positive effect on vegetation biomass under wet conditions, but had no significant effects on vegetation biomass under drought conditions. In conclusion, earthworm activity improved soil fertility and thus promoted vegetation growth. Drought hindered the nutrient absorption and utilization by plants and limited vegetation productivity, but earthworm activity could alleviate the adverse effects caused by drought. These results have implications for understanding the roles of earthworms in the degraded ecosystem and provide a better insight to improve the ecological profit of restoration in eroded red soil.

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Last Update: 2023-01-10