Effects of Different Nitrogen Forms and Supply on Photosynthetic Characteristics and Growth of Phoebe bournei Seedlings under Elevated CO2 Concentration

被引：1

作者：

Wang X. ^{[1
]}

Wei X. ^{[1
,2
]}

Wu G. ^{[1
]}

Chen S. ^{[1
]}

机构：

[1] College of Forestry, Guizhou University, Guiyang

[2] Institute for Forest Resources and Environment of Guizhou, Guiyang

来源：

Linye Kexue/Scientia Silvae Sinicae | 2021年 / 57卷 / 04期

关键词：

Carbon dioxide; Nitrogen; Phoebe bournei; Photosynthesis; Photosynthetic enzyme;

D O I：

10.11707/j.1001-7488.20210418

中图分类号：

学科分类号：

摘要：

【Objective】In this paper, the photosynthetic characteristics and growth performance of Phoebe bournei seedlings under different CO2 concentrations, different nitrogen forms and supply were studied to explore whether nitrogen fertilization could be used to regulate the photosynthesis of P. bournei seedlings.【Method】 One-year-old P. bournei seedlings were used as experimental materials. The open-top gas chamber was used for CO2 concentration treatment [ambient concentration: (350±70) μmol•mol-1; elevated concentration: (700±10) μmol•mol-1], and different amounts (medium dosage 0.8 g•plant-1, increased dosage 1.2 g•plant-1) of nitrate and ammonium were used to cultivate P. bournei seedlings.【Result】Compared with ambient CO2 concentration treatment, after a long period of elevated concentration CO2 treatment (88 days), the net photosynthetic rate of P. bournei seedlings reduced by 26.93% (P<0.05), and its Rubisco and RCA activity, soluble sugar, and starch, soluble protein content, seedling height and ground diameter were all significantly lower (P<0.05) than those treated with ambient CO2. The photosynthetic down-regulation phenomenon of P. bournei seedlings eventually affected growth. Under long-term elevated CO2 concentration, the net photosynthetic rate of P. bournei seedlings subjected to increased nitrate or ammonium had no significant changes (P>0.05), its Rubisco and RCA activity, soluble sugar, starch, soluble protein content, and seedlings height and ground diameter increased or there was no significant change, indicating that increasing nitrate or ammonium nitrogen application can alleviate the adverse effects of long-term elevated CO2 concentration conditions on photosynthesis and growth of P. bournei seedlings.【Conclusion】Under the condition of long-term elevated CO2 concentration, the application of increased nitrate or ammonium nitrogen can increase the activities of photosynthetic key enzymes, increase the content of organic matter, and eventually promote the growth of P. bournei seedlings to alleviate the negative impact of elevated CO2 concentration on the growth of P. bournei seedlings. © 2021, Editorial Department of Scientia Silvae Sinicae. All right reserved.

引用

页码：173 / 181

页数：8

共 44 条

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