热带作物学报2024，Vol.45Issue(7)：1420-1430,11.DOI:10.3969/j.issn.1000-2561.2024.07.015
咖啡果皮与枯落物覆盖对土壤有机碳组分的影响
Effects of Coffee Peel and Litter Mulch on Soil Organic Carbon Frac-tions in Coffee Plantations
摘要
Abstract
As an important component of terrestrial soil carbon reservoirs,the agricultural soil organic carbon pool is greatly influenced by cultivation patterns.Coffee,one of the major economic crops in tropical regions of the world,a minor changes of its cultivation pattern can significantly affect the carbon balance of terrestrial ecosystems.Mulching cultivation is one of the traditional cultivation models for coffee,but its impact on the organic carbon composition of coffee plantation soil is still unclear.Therefore,based on the previous research of our team using coffee peel and leaf litter as substitutes for traditional mulch to cultivate coffee,four mulching treatments were set up in this study:uncov-ered coffee waste(CK),coffee leaf litter mulch(L),coffee peel mulch(P),and both coffee peel and litter mulch(PL).Soil micro-environment,microbial community diversity and biomass,organic carbon fractions,and other indicators were monitored in the coffee plantation,and the intrinsic relationships between soil micro-environment,microbial community structure,and organic carbon fractions were analyzed to investigate the effects of coffee waste cover on soil components and the key driving factors.The results showed that coffee waste cover did not affect the content of soil organic carbon(SOC),heavy fraction organic carbon(HFOC),and dissolved organic carbon(DOC),while coffee peel and litter mulch significantly increased the content of soil light fraction organic carbon(LFOC)by 13.31％and 14.12％,respectively.Coffee waste mulch did not affect soil micro-environment indicators or microbial diversity.Coffee peel cover significantly increased soil microbial biomass by 14.05％,and increased the relative abundance of Proteobacteria and Firmicutes by 18.60％and 80.77％,respectively,while reducing the abundance of Cyanobacteria by 70.14％,but had little impact on soil fungal community.Coffee litter mulch significantly increased the relative abundance of Proteobac-teria and Firmicutes by 14.43％and 57.63％,respectively,while reduced the abundance of Cyanobacteria by 73.43％,and significantly increased the relative abundance of dominant fungi Ascomycota by 14.79％.The reason why coffee waste mulch did not affect the soil organic carbon content is mainly attributable to the insensitivity response of HFOC content to coffee waste mulching.The increase of microbial biomass and the increase relative abundance of Firmicutes are the main reasons to enhance the excitation effect caused by external organic carbon input,thus significantly in-creasing the content of soil LFOC content.The short-term mulch of coffee waste significantly increased the content of soil LFOC content,which is contribute to improve the soil carbon storage of coffee plantations and optimize the green and low-carbon production mode of coffee.关键词
咖啡/果皮/枯落物/土壤有机碳组分/土壤微生物Key words
coffee/peel/litter/soil organic carbon fractions/soil microbe分类
农业科技引用本文复制引用
张昂,陈苏森,谭军,林兴军,赵青云,孙燕,董云萍,闫林,龙宇宙..咖啡果皮与枯落物覆盖对土壤有机碳组分的影响[J].热带作物学报,2024,45(7):1420-1430,11.基金项目
海南省自然科学基金项目(No.322QN406,No.321QN327) （No.322QN406,No.321QN327）
国家自然科学基金项目(No.31901469). （No.31901469）
