CO2浓度升高条件下不同氮素供应对闽楠幼苗光合特性及生长的影响

doi:10.11707/j.1001-7488.20210418

Abstract

Abstract:

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.

Key words: Phoebe bournei, nitrogen, carbon dioxide, photosynthesis, photosynthetic enzyme

CLC Number:

S718.43

Xiao Wang,Xiaoli Wei,Gaoyin Wu,Shengqun Chen. Effects of Different Nitrogen Forms and Supply on Photosynthetic Characteristics and Growth of Phoebe bournei Seedlings under Elevated CO₂ Concentration[J]. Scientia Silvae Sinicae, 2021, 57(4): 173-181.

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References 0

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处理 Treatments		净光合速率 P_n/(μmol·m^-2s^-1)	气孔导度 G_s/(mol·m^-2s^-1)	胞间CO₂浓度 C_i/(μmol·m^-2s^-1)	蒸腾速率 Tr/(mmol·m^-2s^-1)	水分利用效率 WUE/(μmol·mmol^-1)
aCO₂	NO₃^-	4.53±0.78cd	0.088±0.02d	192.8±10.7cd	2.26±0.48d	2.04±0.18a
	iNO₃^-	5.38±0.51a	0.121±0.01a	205.7±2.8b	2.97±0.22a	1.81±0.05bcd
	NH₄⁺	4.02±0.69e	0.086±0.03d	197.6±11.8c	2.37±0.54cd	1.72±0.16d
	iNH₄⁺	4.80±0.25bc	0.094±0.01cd	191.8±2.5d	2.68±0.12b	1.79±0.05cd
eCO₂	NO₃^-	3.31±0.83f	0.070±0.03e	205.8±11.4b	1.75±0.56e	1.93±0.18ab
	iNO₃^-	5.11±0.53ab	0.115±0.01ab	207.7±1.8ab	2.69±0.29b	1.90±0.02bc
	NH₄⁺	4.35±0.36de	0.105±0.01bc	212.1±5.1a	2.59±0.22bc	1.69±0.10d
	iNH₄⁺	5.01±0.47ab	0.116±0.01ab	208.4±6.1ab	2.82±0.24ab	1.78±0.15cd

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

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

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