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.
武夷山西坡退耕还林对土壤溶解性有机质含量和生物降解性的影响
- Title:
- Effects of Returning Farmland to Forest on Concentration and Biodegradability of Soil Dissolved Organic Matter in the Western Slope of Wuyi Mountain
- 文章编号:
- 1005-3409(2024)02-0052-08
- Keywords:
- ecological stoichiometry; biodegradability; soil dissolved organic carbon; subtropical forest; afforestation
- 分类号:
- S714
- 文献标志码:
- A
- 摘要:
- [目的]揭示典型人工林土壤溶解性有机质(DOM)含量和生物降解性及其影响因素,为评估武夷山西坡退耕还林工程的生态服务功能提供科学支撑。[方法]选取江西省武夷山西坡杉木林、枫香林、枫香-木荷混交林和弃耕地,调查了0—10 cm和10—30 cm土壤溶解性有机碳(DOC)、溶解性全氮(DTN)和溶解性全磷(DTP)浓度以及DOM芳香化程度,分析了土壤DOM生物降解性及其影响因素。[结果](1)退耕还林对土壤DOM含量的影响趋势取决于造林树种,但退耕还林地土壤DOC:DTP和DTN:DTP均高于弃耕地;(2)在0—10 cm中,枫香林土壤DOM的芳香族碳含量高于弃耕地,在10—30 cm中,杉木林土壤DOM的芳香族碳含量则低于弃耕地;(3)枫香林和混交林0—10 cm土壤DOM生物降解性均低于弃耕地,而杉木林10—30 cm土壤DOM生物降解性则高于弃耕地;(4)土壤DOM生物降解性与DOC:DTN:DTP化学计量比无显著相关,但与芳香族碳含量存在显著负相关关系,即碳质量调控土壤DOM生物降解性。[结论]树种决定着武夷山西坡退耕还林地土壤DOM数量和芳香化程度,而且碳质量是驱动退耕还林后土壤DOM生物降解性变化的主要因素。这些研究结果有助于理解和评估亚热带地区退耕还林工程的土壤碳汇功能。
- 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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备注/Memo
收稿日期:2022-07-14 修回日期:2023-03-23
资助项目:国家自然科学基金(32060295); 江西省杰出青年基金(20212ACB215002); 江西省“双千计划”项目(jxsq2018106044)
第一作者:魏志聪(1997—),男,江西赣州人,硕士研究生,研究方向为退耕还林的水土保持效益。E-mail:weizcong1997@163.com
通信作者:毛瑢(1981—),男,湖南邵阳人,博士,研究员,主要从事森林生态与水土保持研究。E-mail:maorong@jxau.edu.cn