Effects of Fertilization on Photosynthetic Carbon Fixation of Phoebe bournei Seedlings

被引：0
|
作者：
Wang Y. [1 ,2 ]
Feng J. [1 ]
Wu X. [1 ]
Huang L. [1 ]
Wu J. [1 ]
Chen Y. [1 ]
Yang Z. [1 ]
机构：
[1] College of Forestry, Fujian Agriculture and Forestry University, Fuzhou
[2] Chinese Society of Forestry, Beijing
来源：
Linye Kexue/Scientia Silvae Sinicae | 2022年 / 58卷 / 05期
关键词：
acid phosphatase; N; P; K fertilization; Phoebe bournei seedling; photosynthetic carbon fixation; starch content; water use efficiency;
D O I：
10.11707/j.1001-7488.20220505
中图分类号：
学科分类号：
摘要：
【 Objective】 In this paper, the effects of different fertilization rates and models of nitrogen (N), phosphorus (P) and potassium (K) on photosynthetic characteristics, organic compound content and enzyme activities in leaves, and nutrients of Phoebe bournei seedlings were investigated, to reveal the mechanism of photosynthetic carbon fixation regulated by fertilization, which would provide a theoretical basis for the cultivation of strong seedlings and scientific fertilization of P. bournei. 【 Objective】 The “3414” field experiment was conducted to analyze the effects of different N,P,K fertilization treatments on photosynthetic pigment contents, photosynthetic indexes, leaf organic compound content and enzyme activities of P. bournei seedlings. The range analysis method was used to screen the best N,P,K fertilization model. The stepwise regression, correlation and path analysis method were used to construct the photosynthetic carbon fixation pathway regulated by fertilization. 【 Result】 1) N,P,K fertilization increased the photosynthetic pigment content, photosynthesis, transpiration and water use capacity, reduced the contents of soluble sugars, soluble protein and malondialdehyde (MDA), increased the activities of nitrate reductase (NR), glutamine synthetase (GS) and acid phosphatase (ACP), inhibited polyphenol oxidase (PPO) activity, increased leaf starch content, and then promoted leaf carbon fixation of P. bournei seedlings. In the photosynthetic carbon metabolism, ACP, WUE and starch content were the key regulation points. 2) N element enhanced NR activity, increased chlorophyll a content, water use efficiency, and leaf carbon fixation of P. bournei seedlings. 3) P element increased chlorophyll b content, decreased MDA content, protected cell integrity, and improved carbon assimilation efficiency, but had no significant effect on the metabolism of photosynthate of P. bournei seedlings. 4) K element increased the contents of chlorophyll a and b, stomatal conductance, stomatal CO2 and water use efficiency, starch content, and leaf carbon fixation of P. bournei seedlings. 5) Under the combined application of N, P and K fertilizer, the absorption of N, P and K was the most, which was significantly correlated with ACP activities, and was the most beneficial to photosynthetic carbon fixation, followed by the combined application of N and K fertilizer, and the smallest was single application of P fertilizer. The treatment effect of T6 (N: 0.532 g·plant-1 , P 2 O5 : 0. 33 g·plant-1 , K2 O: 0.356 g· plant-1) was the best. 【 Conclusion】 After fertilization, P. bournei seedlings absorb N, P and K element, thereby increase the stomata ventilation, significantly improve the stomatal conductance, transpiration rate, and water use efficiency, increase net photosynthetic rate, photosynthetic product, and protein synthesis. Under the action of ACP enzyme, fertilization regulates carbon metabolism, and promotes the production of starch which can provide material and energy for growth of P. bournei seedlings. © 2022 Chinese Society of Forestry. All rights reserved.
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页码：40 / 52
页数：12
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