Deffects of Biochar Application and Nitrogen Reduction on the Growth and Photosynthetic Characteristic of Phoebe bournei

doi:10.13466/j.cnki.lczyyj.2024.02.014

Abstract

Abstract:

In order to clarify the effects of biochar application and nitrogen reduction on the growth and photosynthetic characteristics of Phoebe bournei seedlings,four treatments were set up in a pot experiment,such as blank control(CK),conventional nitrogen application(F1),biochar application with 20% nitrogen reduction(F2B1)and biochar application with 40% nitrogen reduction(F3B2).After six months of treatment with F2B1 and F3B2,compared with CK,the results demonstrated that the plant height increased by 11.5% and 19.5%,respectively,and the ground diameter increased by 7.5% and 9.1%,respectively.The total leaf length of F1,F2B1 and F3B2 treatments was 10.1%,26.1% and 24.9% longer than that of CK,respectively.The same trend was observed for total leaf area,which was significantly higher than CK for all three fertilization treatments.However,there was no significant difference between the leaf shape coefficients.The results of photosynthetic physiological parameters revealed that the net photosynthetic rate(P_n),transpiration rate(T_r),and stomatal conductance(G_s) were markedly enhanced in F2B1 and F3B2 treatments compared to CK.There was no significant effect on water use efficiency.There was a significant positive association between plant height,ground diameter,and leaf net photosynthetic rate.Both F2B1 and F3B2 treatments could promote plant growth and photosynthesis.Among them the F3B2 treatment had better effects on plant height,net photosynthetic rate,and stomatal conductance.This study could serve as a framework for determining the ideal ratio of nitrogen fertilizer and biochar application when cultivating P.bournei seedlings.

Key words: biochar, nitrogen reduction, Phoebe bournei, growth, photosynthetic characteristic

CLC Number:

S723.7

YANG Ling, CHEN Zetao, CHEN Jiaxian, CHEN Zhufeng, ZENG Shucai, HE Qian, SU Yan, QIU Quan. Deffects of Biochar Application and Nitrogen Reduction on the Growth and Photosynthetic Characteristic of Phoebe bournei[J]. Forest and Grassland Resources Research, 2024, (2): 116-123.

Figures/Tables 5

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处理	7月	8月	9月	10月	11月	12月
CK	38.4±1.1a	34.8±0.8a	34.7±0.9a	32.7±0.8b	31.0±0.9b	30.6±0.9b
F1	38.7±0.9a	37.0±1.3a	35.5±1.0a	35.5±1.0a	34.1±0.9a	33.6±0.8a
F2B1	39.8±0.9a	37.7±1.0a	36.9±0.9a	36.0±0.8a	35.7±0.7a	34.6±0.7a
F3B2	38.1±1.1a	36.7±1.0a	34.9±0.6a	34.1±0.7ab	35.3±1.1a	34.2±1.0a