Abstract: A field trial was conducted in tea garden where tea plants had been continuously monocultured for 20 years, located in Taozhou, Anxi of Fujian Province, with four treatments including no fertilization (CK), nitrogen fertilizer (NF), goat manure (GM) and leguminous green manure (LF), to investigate physicochemical properties, microbial metabolic activities and phospholipids fatty acid (PLFA) in tea rhizosphere soil. The results showed that pH, organic matter and available K were improved by 0.47%, 17.56% and 56.10% under NF, 2.36%, 27.48% and 63.41% under GM, and 2.13%, 54.96% and 73.17% under LF, respectively. The alkalytic N and available phosphorus were significantly decreased by 9.10% and 335.00% under NF, while increased by 17.06 and 211.00% under GM, and 16.70% and 388.00% under LF, respectively. Meanwhile, the activities of urease, sucrase, polyphenol oxidase and peroxidase were improved by NF, GM and LF, with the effect of improvement being in order of LF> GM> NF. Acid phosphatase activity and microbial P use rate were significantly decreased by 70.04% and 249.00% under NF, while increased by 24.74% and 180.00% under GM, and 34.28% and 251.00% under LF, respectively. Furthermore, microbial community abundance and bacterial diversity were dramatically improved under GM and LF. In conclusion, both GM and LF can improve soil fertility and promote microbial metabolic activities in tea rhizosphere soil, being meaningful to enhance economical and ecological efficiency of tea gardens.

Key words: growth characteristics, soil reinforcement, lateral-root branch, anti-fracture force, self-healing