遮阴对濒危植物朝鲜崖柏光合特性的影响

doi:10.12302/j.issn.1000-2006.202012003

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南京林业大学学报（自然科学版） ›› 2022, Vol. 46 ›› Issue (5): 58-66.doi: 10.12302/j.issn.1000-2006.202012003

遮阴对濒危植物朝鲜崖柏光合特性的影响

苑景淇¹^,²(), 于忠亮¹^,², 兰雪涵¹, 李成宏¹, 田年军³, 杜凤国¹^,⁴^,^*()

1.北华大学林学院,吉林吉林 132013
2.吉林省林业科学研究院,吉林长春 130033
3.白山市林业科学研究院,吉林白山 134300
4.长白山特色森林资源保育与高效利用国家林业和草原局重点实验室,吉林吉林 132013

收稿日期:2020-12-01 修回日期:2021-03-09 出版日期:2022-09-30 发布日期:2022-10-19
通讯作者: 杜凤国
基金资助:
国家林业和草原局项目(2017);北华大学研究生创新计划项目(北华研创合字[2019]第004号)

Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

YUAN Jingqi¹^,²(), YU Zhongliang¹^,², LAN Xuehan¹, LI Chenghong¹, TIAN Nianjun³, DU Fengguo¹^,⁴^,^*()

1. College of Forestry, Beihua University, Jilin 132013, China
2. Jilin Province Academy of Forestry Science, Changchun 130033, China
3. Baishan City Academy of Forestry Science, Baishan 134300, China
4. Key Laboratory of National Forestry and Grassland Administration on Conservation and Efficient Utilization of Precious and Rare Forest Resource in Changbai Mountain, Jilin 132013, China

Received:2020-12-01 Revised:2021-03-09 Online:2022-09-30 Published:2022-10-19
Contact: DU Fengguo

摘要/Abstract

摘要：

【目的】分析濒危植物朝鲜崖柏(Thuja koraiensis)光合特性,探讨光合作用与环境因子的关系,为开展朝鲜崖柏的有效保育提供依据。【方法】应用Li-6400便携式光合仪器,测定朝鲜崖柏7年生扦插苗在不同光环境(L0、L1、L2、L3,即遮阴度分别为0%、25%、50%和75%)下光响应曲线、光合日变化和色素含量,并进行通径分析。【结果】随遮阴度增加,最大净光合速率(P_n,max)、暗呼吸速率(R_d)、光饱和点(L_SP)和光补偿点(L_CP)显著减小,表明朝鲜崖柏具有一定的耐阴性。随遮阴度增加光合日变化的净光合速率(P_n)、气孔导度(G_s)和蒸腾速率(T_r)随之降低,非气孔限制因素是朝鲜崖柏光合速率下降的主要原因。朝鲜崖柏通过增加叶绿素a、叶绿素b、总叶绿素和类胡萝卜素含量适应遮阴环境。在不同光环境下,空气相对湿度是影响光合日变化净光合速率的主要环境因子;根据决定系数排序,在L0和L1处理中空气相对湿度影响最大,在L2和L3处理中光合有效辐射(P_AR)影响最大。【结论】朝鲜崖柏在全光照和遮阴25%时有较好的光合性能,具有一定的耐阴性,但遮阴度过高时会因光照不足影响植株的正常生长。

关键词: 朝鲜崖柏, 遮阴处理, 光合特性, 色素含量, 通径分析

Abstract:

【Objective】To provide scientific basis for effective conservation measures for Thuja koraiensis, the photosynthetic characteristics of endangered plant T. koraiensis were analyzed and the relationship between photosynthesis and environmental factors was discussed. 【Method】The Li-6400 portable photosynthetic system was used in the study, the photosynthetic and physiological characteristics of the 7-year-old cutting seedlings of T. koraiensis in different light environments (L0, L1, L2 and L3, shade degrees were 0%, 25%, 50% and 75%, respectively.) including light response curve,diurnal variation of photosynthesis and pigment content were analyzed, and analysis of path coefficient was carried out. 【Result】The results of light response curve fitting showed that with the increaseing of shading intensity, the maximum net photosynthetic rate, dark respiration rate, light saturation point and light compensation point decreased significantly, which indicated that T. koraiensis had a certain shade-tolerance. The results of diurnal variation curve of photosynthesis showed that with the increasing of shading intensity, the net photosynthetic rate, stomatal conductance and transpiration rate decreased, and the principal reason of the reduction in photosynthesis was attributed to non-stomatal limitation factor. The results of pigment content showed that T. koraiensis responded to the shade environment by increasing the contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoids. The results of the analysis of path coefficient showed that, air relative humidity (RH) was the main environmental factor affecting the net photosynthetic rate of diurnal variation of photosynthesis under different light environments. According to the ranking of decision coefficient, RH had the largest effet on the net photosynthetic rate in L0 and L1, and PAR had the largest in L2 and L3. 【Conclusion】T. koraiensis had better photosynthetic performance under full light and 25% shading, and had a certain shade-tolerance. However, when the shading intensity was too high, the normal growth of plants would be affected by insufficient light.

Key words: Thuja koraiensis, shading treatments, photosynthesis, pigment content, analysis of path coefficient

中图分类号:

S718
Q948

苑景淇,于忠亮,兰雪涵,等. 遮阴对濒危植物朝鲜崖柏光合特性的影响[J]. 南京林业大学学报（自然科学版）, 2022, 46(5): 58-66.

YUAN Jingqi, YU Zhongliang, LAN Xuehan, LI Chenghong, TIAN Nianjun, DU Fengguo. Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis[J].Journal of Nanjing Forestry University (Natural Science Edition), 2022, 46(5): 58-66.DOI: 10.12302/j.issn.1000-2006.202012003.

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处理 treatment	A_QY/ (mol·mol^-1)	P_n,max/ (μmol·m^-2·s^-1)	R_d/ (μmol·m^-2·s^-1)	L_SP/ (μmol·m^-2·s^-1)	L_CP/ (μmol·m^-2·s^-1)	R²
L0	0.037±0.002 b	4.063±0.228 a	2.027±0.137 a	1107.164±26.407 a	72.169±1.284 a	0.995
L1	0.046±0.002 a	3.193±0.167 b	1.602±0.108 b	816.673±18.113 b	46.906±1.182 b	0.982
L2	0.036±0.002 b	3.033±0.158 b	1.123±0.072 c	814.256±16.594 b	39.403±0.804 c	0.976
L3	0.026±0.001 c	2.654±0.141 b	0.802±0.063 c	764.537±13.206 b	37.254±1.628 c	0.991

处理 treatment	P_n / (μmol·m^-2·s^-1)	P_AR/ (μmol·m^-2·s^-1)	G_s/ (mmol·m^-2·s^-1)	T_r/ (mmol·m^-2·s^-1)	C_i/ (μmol·mol^-1)	L_s
L0	2.123±0.308 a	692.011±49.894 a	0.080±0.008 a	1.699±0.121 a	303.170±8.025 b	0.171±0.021 a
L1	1.512±0.253 ab	449.549±36.895 b	0.073±0.006 a	1.513±0.093 ab	325.660±10.681 ab	0.118±0.028 ab
L2	1.368±0.237 bc	158.680±10.919 c	0.066±0.007 ab	1.333±0.098 bc	331.326±10.493 ab	0.106±0.027 ab
L3	0.708±0.205 c	63.630±4.434 d	0.053±0.005 b	1.044±0.083 c	347.084±12.635 a	0.070±0.033 b

处理 treatment	叶绿素a含量/ (mg·g^-1) Chla content	叶绿素b含量/ (mg·g^-1) Chlb content	总叶绿素含量/ (mg·g^-1) Chl a+b content	叶绿素a/b Chl a/b	类胡萝卜素含量/ (mg·g^-1) Car content	类胡萝卜素/ 总叶绿素 Car/Chl
L0	0.180±0.001 d	0.088±0.002 d	0.268±0.003 d	2.036±0.034 a	0.018±0.000 d	0.068±0.001 c
L1	0.216±0.001 c	0.103±0.001 c	0.319±0.001 c	2.110±0.003 a	0.031±0.000 a	0.097±0.001 a
L2	0.266±0.001 b	0.128±0.001 b	0.395±0.001 b	2.076±0.031 a	0.029±0.001 b	0.074±0.002 b
L3	0.296±0.001 a	0.152±0.002 a	0.448±0.002 a	1.950±0.018 b	0.022±0.001 c	0.049±0.002 d

处理 treatment	因子 factor	P_n	T_a	C_a	H_R
	T_a	0.341
L0	C_a	0.476^**	-0.566^**
	H_R	0.491^**	-0.523^**	0.921^**
	P_AR	0.197	0.952^**	-0.677^**	-0.603^**
	T_a	0.259
L1	C_a	0.352	-0.731^**
	H_R	0.464^*	-0.650^**	0.897^**
	P_AR	0.297	0.918^**	-0.622^**	-0.566^**
	T_a	0.041
L2	C_a	0.311	-0.896^**
	H_R	0.399^*	-0.823^**	0.929^**
	P_AR	0.429^*	0.837^**	-0.602^**	-0.522^**
	T_a	-0.255
L3	C_a	0.178	-0.935^**
	H_R	0.228	-0.910^**	0.929^**
	P_AR	0.391^*	0.129	-0.277	-0.375

处理 treatment	多元线性回归方程 multivariate linear regression equation	R²	F	P
L0	P_n = -70.735+0.081 H_R+0.455 T_a+0.151 C_a	0.794	29.616	<0.001
L1	P_n = -50.424+0.142 H_R+0.576 T_a+0.075 C_a	0.800	30.575	<0.001
L2	P_n = -9.951+0.019 P_AR+0.154 H_R	0.718	30.579	<0.001
L3	P_n = -4.711+0.026 P_AR+0.068 H_R	0.316	5.542	0.011

遮阴对濒危植物朝鲜崖柏光合特性的影响

Effects of shading treatments on photosynthetic characteristics of endangered plant Thuja koraiensis

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处理 treatment	因子 factor	直接通径系数 direct path coefficient	间接通径系数indirect path coefficient					决定系数 R²
处理 treatment	因子 factor	直接通径系数 direct path coefficient	∑	T_a	C_a	H_R	P_AR	决定系数 R²
	T_a	0.899	-0.558		-0.370	-0.188		-0.195
L0	C_a	0.654	-0.178	-0.509		0.331		0.195
	H_R	0.359	0.132	-0.470	0.602			0.224
	T_a	1.101	-0.842		-0.369	-0.473		-0.642
L1	C_a	0.505	-0.153	-0.805		0.652		0.100
	H_R	0.727	-0.263	-0.716	0.453			0.146
L2	H_R	0.857	-0.458				-0.458	-0.051
	P_AR	0.877	-0.447			-0.447		-0.017
L3	H_R	0.436	-0.208				-0.208	0.009
	P_AR	0.554	-0.164			-0.164		0.126

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