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[1]Wei Zhicong,Luo Xiaomin,Shi Fuxi,et al.Effects of Returning Farmland to Forest on Concentration and Biodegradability of Soil Dissolved Organic Matter in the Western Slope of Wuyi Mountain[J].Research of Soil and Water Conservation,2024,31(02):52-59.

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Effects of Returning Farmland to Forest on Concentration and Biodegradability of Soil Dissolved Organic Matter in the Western Slope of Wuyi Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 02 Page number: 52-59 Column: Public date: 2024-03-20

Title:: Effects of Returning Farmland to Forest on Concentration and Biodegradability of Soil Dissolved Organic Matter in the Western Slope of Wuyi Mountain

Author(s):: Wei Zhicong¹, Luo Xiaomin^2,3, Shi Fuxi^1,2, Cao Junlin^2,3, Mao Rong^1,2; (1.Key Laboratory of Forest Ecosystem Protection and Restoration of Poyang Lake Watershed, National Forestry and Grassland Administration, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China; 2.Jiangxi Matoushan Observation and Research Station of Forest Ecosystem, Zixi, Jiangxi 335300, China; 3.Jiangxi Matoushan National Nature Reserve Administration, Zixi, Jiangxi 335300, China)

Keywords:: ecological stoichiometry; biodegradability; soil dissolved organic carbon; subtropical forest; afforestation

CLC:: S714

DOI:: -

Abstract:: [Objective] The aims of this study are to explore soil dissolved organic matter(DOM)concentration and biodegradability and their influencing factors in typical plantations, and then to provide scientific support for assessing ecological service function of returning farmland to forest in the western slope of Wuyi Mountain. [Methods] Cunninghamia lanceolata forests, Liquidambar formosana forests, Liquidambar formosana-Schima superba mixed forests, and abandoned farmlands were selected in the western slope of Wuyi Mountain in Jiangxi Province, and soil dissolved organic carbon(DOC), dissolved total nitrogen(DTN), and dissolved total phosphorus(DTP)concentrations, and DOM aromatic degree in 0—10 cm and 10—30 cm depths were measured in these selected forests. Meanwhile, soil DOM biodegradability and its influencing factors were assessed. [Results](1)The effect of returning farmland to the forest on soil DOM concentration was dependent on tree species, whereas soil DOC:DTP and DTN:DTP ratios were higher in the forests than in the abandoned farmland.(2)L. formosana forests had higher greater aromatic carbon content of soil DOM than abandoned farmland in the 0—10 cm depth, whereas C. lanceolata forests had lower aromatic carbon content of soil DOM than abandoned farmland in the 10—30 cm depth.(3)Soil DOM biodegradability was lower in the L. formosana forests and L. formosana-S. superba mixed forests than in the abandoned farmlands in the 0—10 cm depth, but was greater in the C. lanceolata forests than in the abandoned farmlands in the 10—30 cm depth.(4)Soil DOM biodegradability exhibited no significant relationship with DOC:DTN, DOC:DTP, and DTN:DTP ratios, but was significantly negatively correlated with aromatic carbon contents, indicating that carbon quality regulates soil DOM biodegradability. [Conclusion]Tree species regulate the effect of returning farmland to the forest on soil DOM quantity and aromaticity, and carbon quality is the key factor driving the changes in soil DOM biodegradability after returning farmland to the forest in the western slope of Wuyi Mountain. These findings will help understand and assess the consequences of returning farmland to the forest on soil carbon sink function in the subtropical regions.

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Last Update: 2024-04-20