水土保持研究2024，Vol.31Issue(2)：52-59,8.DOI:10.13869/j.cnki.rswc.2024.02.011
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
Effects of Returning Farmland to Forest on Concentration and Biodegradability of Soil Dissolved Organic Matter in the Western Slope of Wuyi Mountain
摘要
Abstract
[Objective]The aims of this study are to explore soil dissolved organic matter(DOM)concentra-tion 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 for-mosana-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 concentra-tion was dependent on tree species,whereas soil DOC∶DTP and DTN∶DTP ratios were higher in the for-ests 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 farm-lands 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 car-bon 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 for-est 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.关键词
生态化学计量学/生物降解性/土壤溶解性有机碳/亚热带森林/造林Key words
ecological stoichiometry/biodegradability/soil dissolved organic carbon/subtropical forest/afforestation分类
农业科技引用本文复制引用
魏志聪,罗晓敏,石福习,曹俊林,毛瑢..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[J].水土保持研究,2024,31(2):52-59,8.基金项目
国家自然科学基金(32060295) （32060295）
江西省杰出青年基金(20212ACB215002) （20212ACB215002）
江西省"双千计划"项目(jxsq2018106044) （jxsq2018106044）
