贝壳砂生境干旱胁迫下杠柳叶片光合光响应模型比较

doi:10.3724/SP.J.1258.2013.00012

植物生态学报 ›› 2013, Vol. 37 ›› Issue (2): 111-121.DOI: 10.3724/SP.J.1258.2013.00012

贝壳砂生境干旱胁迫下杠柳叶片光合光响应模型比较

王荣荣¹^,², 夏江宝²^,^*(), 杨吉华¹, 赵艳云²^,³, 刘京涛², 孙景宽²^,³

¹山东农业大学林学院, 山东泰安 271018
²滨州学院山东省黄河三角洲生态环境重点实验室, 山东滨州 256603
³中国矿业大学(北京)化学与环境工程学院, 北京 100083

收稿日期:2012-11-13 接受日期:2012-12-19 出版日期:2013-11-13 发布日期:2013-01-31
通讯作者: 夏江宝
作者简介:* (E-mail: xiajb@163.com)
基金资助:
国家自然科学基金项目(31100468);国家自然科学基金项目(41201023);国家“十一五”科技支撑计划课题(2009BADB2B05);山东省自然科学基金项目(Y2006D01)

Comparison of light response models of photosynthesis in leaves of Periploca sepium under drought stress in sand habitat formed from seashells

WANG Rong-Rong¹^,², XIA Jiang-Bao²^,^*(), YANG Ji-Hua¹, ZHAO Yan-Yun²^,³, LIU Jing-Tao², SUN Jing-Kuan²^,³

¹College of Forestry, Shandong Agricultural University, Taian, Shandong 271018, China
²Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta, Binzhou University, Binzhou, Shandong 256603, China
³College of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Received:2012-11-13 Accepted:2012-12-19 Online:2013-11-13 Published:2013-01-31
Contact: XIA Jiang-Bao

摘要/Abstract

摘要：

以黄河三角洲贝壳堤岛3年生杠柳(Periploca sepium)苗木为试验材料, 模拟设置贝壳砂生境下的4种水分梯度, 利用CIRAS-2型光合作用系统测定杠柳叶片在不同干旱胁迫下的光合作用光响应过程, 采用4种光响应模型进行拟合分析, 以比较贝壳砂生境干旱胁迫下适宜的光响应模型, 探讨最佳光响应模型参数对干旱胁迫的适应规律。结果表明: 4种模型对杠柳叶片光合作用光响应过程拟合效果的优劣顺序为: 直角双曲线修正模型>非直角双曲线模型>指数模型>直角双曲线模型, 后3种模型均为没有极值的函数, 故不能很好地拟合光响应曲线光抑制过程, 并不能直接求解最大净光合速率(P_nmax)和光饱和点(LSP)。光响应参数拟合效果最佳表现为: 非直角双曲线模型的暗呼吸速率(R_d), 直角双曲线模型的光补偿点(LCP), 直角双曲线修正模型的P_nmax和LSP。4种光响应模型对干旱胁迫具有不同的适应性, 直角双曲线修正模型适应各种水分条件, 直角双曲线模型和指数模型较适合轻度干旱胁迫条件, 非直角双曲线模型较适合重度干旱胁迫条件。随干旱胁迫的加剧, 光响应参数表观量子效率(AQY)、R_d和LCP先升高后下降, 净光合速率(P_n)、P_nmax和LSP逐渐下降。轻度、中度和重度干旱胁迫下, LSP分别比对照下降5.2%、16.3%和34.5%, P_nmax分别比对照下降17.8%、39.0%和59.0%。水分充足条件下, 杠柳叶片光能利用最强, 光照生态幅最宽; 重度干旱胁迫下, 杠柳叶片表现出明显的光饱和、光抑制现象, 光能利用减弱, 光合能力受到较大限制。

关键词: 光响应模型, 净光合速率, 光合参数, 贝壳堤岛, 土壤水分

Abstract:

Aims Our objectives were to find the optimal models for different drought stresses by comparing four light response models of photosynthesis in leaves of Periploca sepium growing in sand formed from seashells, investigate the adaptability law of parameters of light response models to drought stresses, and define the adaptability of P. sepium to the shell sand moisture conditions.
Methods We used three-year-old P. sepium grown in shell ridge island of China’s Yellow River Delta as experimental material, set up four moisture conditions simulating those in shell sand, measured light responses of photosynthesis in leaves of P. sepium under different drought stresses using CIRAS-2 portable photosynthesis system, and fitted and analyzed the light response curves by four models: rectangular hyperbola, non-rectangular hyperbola, exponential and modified rectangular hyperbola.
Important findings The sequence of fitting effect of the four light response models was in descending order: modified rectangular hyperbola model > non-rectangular hyperbola model > exponential model > rectangular hyperbola model. This result was related to the latter three models not having extreme values, not fitting the process of light response curve declining after light saturation point (LSP), and not directly and accurately solving maximum net photosynthetic rate (P_nmax) and LSP. Among them, the non-rectangular hyperbola model best fit dark respiration rate (R_d), the rectangular hyperbola model best fit light compensation point (LCP) and modified rectangular hyperbola model best fit P_nmax and LSP. The adaptabilities of the four models to different drought stresses varied. The modified rectangular hyperbola model well fit the curves under all the drought stresses, the rectangular hyperbola model and exponential model suited mild drought stress and the non-rectangular hyperbola model suited severe drought stress. The light response parameters, including apparent quantum yield (AQY), R_d, LCP, P_nmax and LSP, responded to drought stresses differently. AQY, R_d and LCP first increased and then decreased with the aggravation of drought stress, while P_n, P_nmax and LSP decreased gradually. LSP decreased by 5.2%, 16.3% and 34.55% under light stress, moderate stress and severe stress, respectively, in comparison to the control (1556 μmol·m^-2·s^-1). P_nmaxdecreased by 17.8%, 39.0% and 59.0% compared to the control (22.58 μmol·m^-2·s^-1). Light use capability of P. sepium leaf was strongest and light ecological amplitude (1520 μmol·m^-2·s^-1) was widest under sufficient water condition; photo-saturation and photo-inhibition occurred significantly, light use capability weakened, and photosynthetic capacity was inhibited seriously under severe stress.

Key words: light response model, net photosynthetic rate, photosynthetic parameter, shell ridge island, soil water

王荣荣, 夏江宝, 杨吉华, 赵艳云, 刘京涛, 孙景宽. 贝壳砂生境干旱胁迫下杠柳叶片光合光响应模型比较. 植物生态学报, 2013, 37(2): 111-121. DOI: 10.3724/SP.J.1258.2013.00012

WANG Rong-Rong, XIA Jiang-Bao, YANG Ji-Hua, ZHAO Yan-Yun, LIU Jing-Tao, SUN Jing-Kuan. Comparison of light response models of photosynthesis in leaves of Periploca sepium under drought stress in sand habitat formed from seashells. Chinese Journal of Plant Ecology, 2013, 37(2): 111-121. DOI: 10.3724/SP.J.1258.2013.00012

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2013.00012

https://www.plant-ecology.com/CN/Y2013/V37/I2/111

图/表 5

图1 干旱胁迫下杠柳叶片净光合速率的光响应曲线。

Fig. 1 Net photosynthetic rate (Pn)-light response curves of Periploca sepium leaf under drought stresses. PAR, photosynthetically active radiation; Wr, relative soil water content.

图2 杠柳叶片净光合速率光响应的实测点与模型拟合曲线(平均值±标准误差)。CK, 对照; T1, 轻度干旱胁迫; T2, 中度干旱胁迫; T3, 重度干旱胁迫。

Fig. 2 Measured points and fitting curves of net photosynthetic rate (Pn)-light responses of Periploca sepium leaf (mean ± SE). CK, control; PAR, photosynthetically active radiation; T1, light drought stress; T2, moderate drought stress; T3, severe drought stress.

表1 杠柳叶片Pn光响应参数实测值与模型拟合值

Table 1 Measured values of net photosynthetic rate-light response parameters of Periploca sepium leaf and the results fitted by four models

光响应模型 Light response model	干旱处理Drought treatment	光响应参数 Light response parameter				R²
光响应模型 Light response model	干旱处理Drought treatment	暗呼吸速率 R_d (μmol·m^-2·s^-1)	光补偿点 LCP (μmol·m^-2·s^-1)	最大净光合速率P_nmax(μmol·m^-2·s^-1)	光饱和点 LSP (μmol·m^-2·s^-1)	R²
实测值 Measured value	CK	1.49	32	22.53	1700	-
	T1	2.04	42	18.59	1600	-
	T2	1.90	59	13.54	1300	-
	T3	1.43	49	9.16	1000	-
直角双曲线模型 Rectangular hyperbola model	CK	2.77	31	30.00	338	0.989
	T1	3.94	43	26.10	276	0.992
	T2	3.61	54	20.07	292	0.978
	T3	3.19	44	13.17	170	0.947
非直角双曲线模型 Non-rectangular hyperbola model	CK	1.37	23	30.00	532	0.999
	T1	2.08	28	30.00	433	0.999
	T2	1.96	51	17.77	506	0.998
	T3	1.38	46	10.50	396	0.988
指数模型 Exponential model	CK	2.48	35	25.21	874	0.999
	T1	2.73	39	21.26	648	1.000
	T2	2.87	52	16.46	541	0.995
	T3	2.32	43	11.05	329	0.981
直角双曲线修正模型 Modified rectangular hyperbola model	CK	2.52	36	22.58	1556	0.999
	T1	2.97	42	18.57	1475	1.000
	T2	2.68	56	13.77	1302	0.998
	T3	2.15	47	9.26	1019	0.998

表2 杠柳叶片Pn光响应参数的模型拟合值与实测值的相对误差

Table 2 Relative errors of measured and fitted values of net photosynthetic rate-light response parameters of Periploca sepium leaf

光合模型 Light response model	干旱处理Drought treatment	相对误差 RE
光合模型 Light response model	干旱处理Drought treatment	暗呼吸速率 R_d	光补偿点 LCP	最大净光合速率 P_nmax	光饱和点 LSP
直角双曲线模型 Rectangular hyperbola model	CK	0.860	0.007	0.332	0.801
	T1	0.931	0.023	0.404	0.828
	T2	0.898	0.086	0.482	0.775
	T3	1.224	0.114	0.438	0.830
非直角双曲线模型 Non-rectangular hyperbola model	CK	0.079	0.263	0.332	0.687
	T1	0.016	0.319	0.614	0.729
	T2	0.030	0.148	0.312	0.611
	T3	0.037	0.066	0.146	0.604
指数模型 Exponential model	CK	0.669	0.121	0.119	0.486
	T1	0.337	0.064	0.143	0.595
	T2	0.508	0.122	0.215	0.584
	T3	0.621	0.129	0.207	0.671
直角双曲线修正模型 Modified rectangular hyperbola model	CK	0.695	0.152	0.002	0.085
	T1	0.456	0.001	0.001	0.078
	T2	0.413	0.058	0.017	0.001
	T3	0.503	0.047	0.011	0.019

图3 杠柳叶片的3个表观量子效率参数对干旱胁迫的响应(平均值±标准误差)。相同参数间的不同小写字母表示差异显著(p < 0.05)。Φ0, 内禀量子效率; Φc, 光补偿点处的量子效率; Φc0, 光补偿点与暗呼吸速率处连线的斜率。CK, 对照; T1, 轻度干旱胁迫; T2, 中度干旱胁迫; T3, 重度干旱胁迫。

Fig. 3 Response of three apparent quantum yield parameters of Periploca sepium leaf to drought stresses (mean ± SE). Φ0, intrinsic quantum yield; Φc, quantum yield at light compensation point (LCP); Φc0, absolute values of slope between photosynthetically active radiation (PAR) = 0 and PAR = LCP. CK, control; PAR, photosynthetically active radiation; T1, light drought stress; T2, moderate drought stress; T3, severe drought stress.

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贝壳砂生境干旱胁迫下杠柳叶片光合光响应模型比较

Comparison of light response models of photosynthesis in leaves of Periploca sepium under drought stress in sand habitat formed from seashells

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