Effect of Nitrogen Deposition on Growth of Phyllostachys edulis Seedlings and Soil Chemical Properties under Low Phosphorus Stress

On November 1st 2018, current year seeds of Phyllostachys eduli were collected from Lin’an, Zhejiang province, and were sowed in containers on November 20th of the same year. The soil was from 1m depth of Ph. eduli stand. On January 20th 2019, seedlings were transplanted in containers for experiment of different phosphorus treatments (2.29, 5, 7.29 and 10 mg·kg-1) and different nitrogen deposition (0, 30, 60 kg/ha) a year. The treatment of 2.29 mg·kg-1 of phosphorus and 0 nitrogen was the control. In March 2019, determinations were conducted on soil conductivity, pH, N, P, K content, and growth traits of Ph. edulis seedlings. The results showed that the treatment with 2.29 mg·kg-1 phosphorus and 60 kg/ha nitrogen could significantly increase soil conductivity, available nitrogen and available phosphorus by 30.01%, 75.00% and 9.76% of the control, and could reduce soil pH, significantly reduce available potassium soil by -1.52% and -33.96%. The treatment significantly increased the biomass and root shoot ratio of Ph. edulis seedlings by 24.59% and 76.38%, while inhibited the height and leaf area growth by 14.04% and 0.95%, but not significantly.