光强和氮素对紫茎幼苗光合特性的影响

张婷宇; 张明如; 李清香; 赵楠楠; 万琦; 蔡益杭

doi:10.11833/j.issn.2095-0756.20210771

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光强和氮素对紫茎幼苗光合特性的影响

doi: 10.11833/j.issn.2095-0756.20210771

浙江农林大学风景园林与建筑学院，浙江杭州 311300

基金项目: 浙江省自然科学基金资助项目(LY18C160002)；国家自然科学基金面上资助项目(31570611)

详细信息

作者简介: 张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com

通信作者: 张明如(ORCID: 0000-0002-7574-9038)，教授，博士，从事森林生态学和珍稀濒危植物扩繁研究。E-mail: 524028109@qq.com

中图分类号: S718.5

Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

College of Landscape and Architecture, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China

摘要: 目的研究紫茎Stewartia sinensis幼苗对不同光强和土壤氮素质量分数的光合生理生态适应差异性，筛选紫茎幼苗适宜的光强和氮素处理组合。方法选择1年生紫茎幼苗为试验材料，设置4个透光率分别为全光100.00%(L₀)、轻度遮光(44.79 ± 0.51)%(L₁)、中度遮光(19.60 ± 0.23)%(L₂)、高度遮光(7.25 ± 0.10)%(L₃)，3个施氮量分别为低氮0.2 g·kg⁻¹(N₁)、高氮0.6 g·kg⁻¹ (N₂)和不施氮(N₀)，经90 d处理测定不同光、氮处理下紫茎幼苗的光响应过程、光合色素质量分数和叶绿素荧光参数。结果光强、氮素及其交互作用对紫茎幼苗的光合色素质量分数和叶绿素荧光参数的影响均达显著水平(P＜0.05)。紫茎幼苗的叶绿素a/b为2.0~2.5，光补偿点(L_CP)为4.8~26.0 μmol·m⁻²·s⁻¹，光饱和点(L_SP)为571.3~931.4 μmol·m⁻²·s⁻¹。随着遮光程度的增加，紫茎幼苗的叶绿素和类胡萝卜素质量分数、初始荧光(F_o)、最大荧光(F_m)、表观量子效率(A_QY)趋于增大，叶绿素a/b、类胡萝卜素/总叶绿素的比值下降，最大净光合速率(P_max)、暗适应下光系统Ⅱ(PSⅡ)潜在活性(F_v/F_o、PSⅡ)最大光能转化效率(F_v/F_m)和以吸收光能为基础的性能指数(P_IABS)呈现先升高后降低的特点。随着施氮量的增加，紫茎幼苗P_IABS趋于增大，叶绿素a/b、F_o和F_m趋于减小。叶绿素和类胡萝卜素质量分数、P_max、A_QY呈现先升高后降低的特点。在L₁和L₂光强下，紫茎幼苗的净光合速率(P_n)、气孔导度(G_s)和蒸腾速率(T_r)较高，且胞间二氧化碳摩尔分数(C_i)较低，此时施用低氮对P_n、G_s和T_r有明显促进作用。L₁N₁的P_max相较L₁N₀增加了45.21%，L₂N₁的P_n和P_max均最高。结论紫茎幼苗在中度遮光和低氮处理下的光合能力最佳，在全光或高氮处理下会出现光合抑制现象。图1表6参34
- 紫茎 /
- 光强 /
- 氮素 /
- 双因素控制试验 /
- 光响应 /
- 光合色素 /
- 叶绿素荧光
Abstract: Objective This study, with an investigation of the differences in the hotosynthetic hysiological and ecological adaptation of Stewartia sinensis seedlings to different light intensity and soil nitrogen content, is aimed to select combinations of light intensity and nitrogen treatment that are conducive to the cultivation of S. sinensis seedlings. Method With S. sinensis seedlings used as test materials, efforts were made to set four light intensity gradients, namely full light (L₀), light light (44.79±0.51)% (L₁), moderate light (19.60±0.23)% (L₂), high light (7.25±0.10)% (L₃), and three nitrogen application rates, i.e, low nitrogen 0.2 g·kg⁻¹ (N₁), high nitrogen 0.6 g·kg⁻¹ (N₂) and no nitrogen application (N₀) before the light response process, photosynthetic pigment mass fraction and chlorophyll fluorescence parameters were recorded and measured upon 90d treatment. Result Light intensity, nitrogen and their interaction displayed significant effects on photosynthetic pigment and chlorophyll fluorescence of S. sinensis seedlings (P＜0.05). Chl a/Chl b values of S. sinensis seedlings varied from 2.0 to 2.5, the L_SP of S. sinensis seedlings varied from 571.3 to 931.4 μmol·m⁻²·s⁻¹ whereas L_CP varied from 4.8 to 26.0 μmol·m⁻²·s⁻¹. With the increase of shading degree, the Chl, Car, F_o, F_m, A_QY of S. sinensis seedlings tended to increase, the Chl a/Chl b and Car/Chl tended to decrease while the P_max, F_v/F_o, F_v/F_mand P_IABS increased first and then decreased. With the increase of nitrogen application rate, the P_IABSof S. sinensis seedlings tended to increase, the Chl a/Chl b, F_o and F_m tended to decrease and the Chl, Car, P_max and A_QY increased first and then decreased; With L₁ and L₂ light intensity, P_n, G_s and T_r of S. sinensis seedlings were higher and C_i was lower and the application of low nitrogen significantly promoted P_n, G_s and T_r. The P_max of L₁N₁ increased by 45.21% compared with L₁N₀ with the P_n and P_max of L₂N₁ being the highest. Conclusion S. sinensis seedlings had the best photosynthetic capacity when grown with moderate shading and low nitrogen treatment whereas photosynthetic inhibition occurred with full light or high nitrogen treatment. [Ch, 1 fig. 6 tab. 34 ref.]
- Stewartia sinensis /
- light intensity /
- nitrogen /
- gouble factor control experiment /
- light response /
- photosynthetic pigment /
- chlorophyll fluorescence

图 1 不同光强和氮素处理下紫茎幼苗的光响应曲线

Figure 1 Photoresponse curve of S. sinensis seedlings under different light intensity and nitrogen treatments

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表 1 不同光强和氮素水平处理下紫茎幼苗光合参数的比较

Table 1. Comparison of photosynthetic parameters of S. sinensis seedlings under different light intensity and nitrogen treatments

处理	R_d/(μmol·m⁻²·s⁻¹)	P_max/(μmol·m⁻²·s⁻¹)	L_SP/(μmol·m⁻²·s⁻¹)	L_CP/(μmol·m⁻²·s⁻¹)	A_QY/(μmol·mol⁻¹)
L₀N₀	0.69±0.08 ab	2.09±0.03 def	791.4±79.6 ab	20.0±0.7 abc	0.027±0.003 b
L₀N₁	0.55±0.09 ab	1.92±0.15 def	717.7±103.1 ab	19.1±4.4 abc	0.031±0.006 b
L₀N₂	0.34±0.12 b	1.54±0.17 ef	638.2±63.0 ab	9.5±2.2 bc	0.032±0.007 b
L₁N₀	0.51±.0.09 b	2.61±0.42 cde	741.2±78.9 ab	10.5±1.3 bc	0.036±0.007 ab
L₁N₁	1.00±.0.27 a	3.79±0.32 abc	931.4±66.3 a	23.6±5.6 ab	0.047±0.017 ab
L₁N₂	0.72±0.35 ab	1.12±0.06 f	877.2±92.0 ab	26.0±17.3 a	0.034±0.014 ab
L₂N₀	0.62±0.21 ab	3.95±0.12 ab	797.1±70.8 ab	11.9±4.4 abc	0.043±0.007 ab
L₂N₁	0.52±0.13 ab	4.63±0.65 a	758.7±101.5 ab	8.3±2.0 bc	0.041±0.002 ab
L₂N₂	0.52±0.11 ab	2.81±0.43 bcd	571.3±49.6 b	11.3±2.7 abc	0.032±0.002 b
L₃N₀	0.30±0.08 b	2.93±0.26 bcd	778.0±185.8 ab	4.8±1.3 c	0.043±0.002 ab
L₃N₁	0.49±0.15 b	3.01±0.18 bcd	699.4±98.1 ab	9.6±4.2 bc	0.048±0.005 ab
L₃N₂	0.55±0.05 ab	2.56±0.48 cde	733.6±101.4 ab	8.3±1.3 bc	0.061±0.019 a
说明：数值为平均值±标准误，同一参数不同小写字母表示不同处理间差异显著(P＜0.05)

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表 2 光强、氮素及其交互作用对紫茎幼苗光合参数影响

Table 2. Effect of light intensity, nitrogen and their interaction on photosynthetic parameters of S. sinensis seedlings

参数	光强	氮素	光强×氮素
R_d	2.028 ns	0.759 ns	1.783 ns
P_max	13.462 ***	11.209 ***	1.948 ns
L_SP	1.362 ns	0.642 ns	0.985 ns
L_CP	4.105 *	0.559 ns	1.943 ns
A_QY	3.133 *	0.283 ns	0.596 ns
说明：、、**、ns分别表示影响效应的显著性为P＜　　　　　0.05、P＜0.01、P＜0.001、P＞0.05

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表 3 不同光强和氮素水平处理下紫茎幼苗光合色素质量分数及比值

Table 3. Content and proportion of photosynthetic pigment of S.sinensis seedlings under different light intensity and nitrogen treatments

处理	Chl a/(mg·g⁻¹)	Chl b/(mg·g⁻¹)	Chl/(mg·g⁻¹)	Car/(mg·g⁻¹)	Chl a/b	Car/Chl
L₀N₀	0.59±0.04 f	0.26±0.02 g	0.85±0.05 i	0.17±0.01 f	2.28±0.13 b	0.20±0.00 a
L₀N₁	1.88±0.04 b	1.15±0.13 c	3.03±0.15 d	0.46±0.05 a	1.72±0.10 d	0.16±0.02 b
L₀N₂	1.74±0.03 c	0.93±0.04 d	2.66±0.06 e	0.47±0.01 a	1.89±0.06 c	0.18±0.00 b
L₁N₀	1.07±0.04 e	0.43±0.02 f	1.50±0.06 h	0.26±0.01 e	2.50±0.04 a	0.17±0.00 b
L₁N₁	1.32±0.06 d	0.70±0.05 e	2.03±0.11 g	0.36±0.03 bcd	1.90±0.04 c	0.18±0.00 b
L₁N₂	2.09±0.01 a	1.95±0.03 b	4.03±0.02 b	0.32±0.04 cde	1.07±0.02 e	0.08±0.01 d
L₂N₀	1.73±0.02 c	0.68±0.01 e	2.42±0.03 f	0.37±0.00 bcd	2.52±0.01 a	0.15±0.00 b
L₂N₁	2.09±0.01 a	1.25±0.02 c	3.34±0.03 c	0.43±0.03 ab	1.68±0.02 d	0.13±0.01 c
L₂N₂	2.12±0.02 a	1.92±0.05 b	4.03±0.04 b	0.29±0.02 de	1.22±0.03 e	0.07±0.01 d
L₃N₀	2.17±0.02 a	1.11±0.06 c	3.28±0.08 c	0.40±0.01 abc	2.00±0.08 c	0.12±0.01 c
L₃N₁	2.10±0.01 a	2.00±0.07 b	4.10±0.06 b	0.25±0.04 e	1.06±0.04 e	0.06±0.01 d
L₃N₂	1.77±0.02 c	3.19±0.07 a	4.95±0.05 a	0.05±0.01 g	0.56±0.02 f	0.01±0.00 e
说明：数值为平均值±标准误，同一参数不同小写字母表示不同处理间差异显著(P＜0.05)

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表 4 光强、氮素及其交互作用对紫茎幼苗光合色素影响

Table 4. Effect of light intensity, nitrogen and their interaction on photosynthetic pigment of S. sinensis seedlings

参数	光强	氮素	光强×氮素
Chl a	316.423***	346.477***	184.931***
Chl b	314.398***	605.842***	48.029***
Chl	434.234***	726.104***	54.300***
Car	15.993***	12.818***	26.129***
Chl a/b	89.690***	373.330***	21.619***
Car/Chl	113.570***	104.247***	12.472***
说明：***表示影响效应的显著性为P＜0.001

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表 5 不同光强和氮素水平处理下紫茎幼苗的叶绿素荧光参数

Table 5. Chlorophyll fluorescence induction parameters of S. sinensis seedlings under different light intensity and nitrogen treatments

处理	F_o	F_m	F_v/F_o	F_v/F_m	P_IABS
L₀N₀	396.0±14.1 d	1081.7±29.7 fg	1.75±0.10 d	0.633±0.014 cd	0.544±0.103 f
L₀N₁	378.0±5.9 d	816.9±50.2 h	1.15±0.11 e	0.526±0.024 e	0.436±0.077 f
L₀N₂	389.3±9.4 d	1013.9±92.0 g	1.58±0.20 d	0.595±0.031 d	0.735±0.182 f
L₁N₀	458.1±8.8 c	1396.7±22.8 d	2.06±0.08 c	0.671±0.009 bc	0.783±0.110 ef
L₁N₁	458.8±9.8 c	1193.9±66.0 ef	1.61±0.14 d	0.606±0.025 d	0.644±0.105 f
L₁N₂	381.9±8.7 d	1298.3±33.0 de	2.40±0.05 ab	0.706±0.004 ab	2.014±0.225 a
L₂N₀	503.7±7.4 b	1798.9±22.0 ab	2.58±0.06 a	0.720±0.005 a	1.381±0.121 cd
L₂N₁	461.2±6.0 c	1627.2±24.6 c	2.53±0.04 a	0.716±0.003 ab	1.800±0.103 ab
L₂N₂	469.2±13.0 c	1673.2±41.7 bc	2.57±0.06 a	0.719±0.004 a	1.686±0.152 abc
L₃N₀	565.3±8.5 a	1786.1±47.9 ab	2.16±0.05 bc	0.682±0.006 ab	1.102±0.052 de
L₃N₁	543.0±12.6 a	1822.4±43.5 a	2.36±0.01 ab	0.702±0.001 ab	1.437±0.063 bcd
L₃N₂	503.2±8.0 b	1711.2±32.4 abc	2.40±0.03 ab	0.706±0.002 ab	1.525±0.069 bc
说明：同一参数不同小写字母表示不同处理间差异显著(P＜0.05)

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表 6 光强、氮素及其交互作用对紫茎幼苗叶绿素荧光参数影响的F值和显著性

Table 6. F-value and significance analysis of effect of light intensity, nitrogen and their interaction on chlorophyll fluorescence induction parameters of S. sinensis seedlings

参数	光强	氮素	光强×氮素
F_o	130.311***	21.499***	5.391***
F_m	194.315***	10.694***	2.664*
F_v/F_o	73.114***	13.156***	6.197***
F_v/F_m	49.274***	10.960***	5.284***
P_IABS	39.101***	20.694***	8.134***
说明：和**分别表示影响效应的显著性为P＜0.05和P＜　　　　　0.001

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光强和氮素对紫茎幼苗光合特性的影响

doi: 10.11833/j.issn.2095-0756.20210771

作者简介: 张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com

通信作者: 张明如(ORCID: 0000-0002-7574-9038)，教授，博士，从事森林生态学和珍稀濒危植物扩繁研究。E-mail: 524028109@qq.com

Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

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光强和氮素对紫茎幼苗光合特性的影响

doi: 10.11833/j.issn.2095-0756.20210771

浙江农林大学风景园林与建筑学院，浙江杭州 311300

作者简介:
张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com

通信作者: 张明如(ORCID: 0000-0002-7574-9038)，教授，博士，从事森林生态学和珍稀濒危植物扩繁研究。E-mail: 524028109@qq.com

English Abstract

Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

College of Landscape and Architecture, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China

目录

留言板

光强和氮素对紫茎幼苗光合特性的影响

doi: 10.11833/j.issn.2095-0756.20210771

作者简介: 张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com

通信作者: 张明如(ORCID: 0000-0002-7574-9038)，教授，博士，从事森林生态学和珍稀濒危植物扩繁研究。E-mail: 524028109@qq.com

Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

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光强和氮素对紫茎幼苗光合特性的影响

doi: 10.11833/j.issn.2095-0756.20210771

浙江农林大学 风景园林与建筑学院，浙江 杭州 311300

作者简介: 张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com

通信作者: 张明如(ORCID: 0000-0002-7574-9038)，教授，博士，从事森林生态学和珍稀濒危植物扩繁研究。E-mail: 524028109@qq.com

English Abstract

Effects of light intensity and nitrogen treatments on photosynthetic characteristics of Stewartia sinensis seedlings

College of Landscape and Architecture, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China

目录

浙江农林大学风景园林与建筑学院，浙江杭州 311300

作者简介:
张婷宇(ORCID: 0000-0002-8281-3894)，从事风景园林植物应用研究。E-mail: 997026727@qq.com