Search

[ Objective] The present paper aimed to clarify the differences of microbial community structure and diversity under different coffee wastes aud their key driving factors, and reveal the regulatory mechanism of soil microbial community under the decomposition of coffee wastes, which is conducive to providing theoretical basis for maintaining farmlaud soil health in tropical region. [Method] The study was conducted in Wanning city, Hainan province. A randomized block design was adopted with four mulching treatments, including uncovered coffee waste ( C), covered coffee litter ( L), covered coffee peel ( P), and covered coffee litter and peel ( PL) at the same time. The soil physical and chemical properties, soil microbial abundance, richness, diversity and other indicators were measured to analyze the internal relationship between soil microclimate factors and soil microbial community structure, and explore the main factors driving the succession of soil bacterial and fungal communities under coffee waste mulching. [Result] The coffee peel and litter mulching significantly increased the content of soil available potassium and alkali hydrolyzable nitrogen by 11. 95% and 16. 19%, respectively, but did not affect other indicators. Coffee peel mulching significantly increased soil bacterial richness and diversity by 7. 75 % and 2. 79%, respectively, whereas coffee peel had little effect on bacterial community richness and diversity; Coffee peel covering significantly increased the relative abundance of Proteobacteria by 18. 79% and Firmicutes by 82. 52%, respectively, but significantly decreased the relative abundance of Cyanobacteria by 70. 17%; Coffee litter mulch significantly increased the relative abundance of Firmicutes by 59. 05%, but significantly decreased the relative abundance of Cyanobacteria by 73. 32%; The fungal community was not sensitive to coffee peel mulch, but coffee litter mulch significantly increased the relative abundance of Ascomycetes by 14. 80%, while reduced the relative abundance of Actinomycetes by 48. 38 % . The main functions of soil microbe did not change significantly, although the relative abundance of some functional microbe was altered by the coffee peel or litter mulching. [Conclusion] Coffee peel mulching significantly increases the soil available potassium content, alkali hydrolyzable nitrogen content, bacterial community diversity, bacterial community richness and the change of bacterial community structure. Coffee peel mulching cultivation is conducive to maintaining the relative stability of the structure and function of the soil microbial community in the coffee garden, thus promoting the health protection of the coffee garden soil and the sustainable development of the coffee planting industry. [ABSTRACT FROM AUTHOR]