太行山南麓栓皮栎和刺槐叶片光合光响应模拟

生态学杂志

太行山南麓栓皮栎和刺槐叶片光合光响应模拟

任博¹,李俊²,同小娟^1*,母艳梅¹,张劲松³,孟平^3#br#

(¹北京林业大学林学院，北京 100083； ^2中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室，北京 100101； ^3中国林业科学研究院林业研究所国家林业局林木培育重点实验室，北京 100091)

出版日期:2017-08-10 发布日期:2017-08-10

Simulation on photosynthetic lightresponse of Quercus variabilis and Robinia pseudoacacia in the southern foot of the Taihang Mountain.

REN Bo¹, LI Jun², TONG Xiao-juan^1*, MU Yan-mei², ZHANG Jin-song³, MENG Ping^3#br#

(¹College of Forestry, Beijing Forestry University, Beijing 100083, China; ^2Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; ³Research Institute of Forestry, Chinese Academy of Forestry; Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China).

Online:2017-08-10 Published:2017-08-10

摘要/Abstract

摘要： 植物光合作用光响应模型研究是评价植物光合响应机制和获得光合参数的主要途径。本文以太行山南麓栓皮栎（Quercus variabilis）和刺槐（Robinia pseudoacacia）人工林为研究对象，采用LI6400XT光合测定系统测定了这两种人工林叶片光合作用光响应曲线，利用直角双曲线模型（RH）、非直角双曲线模型（NRH）以及直角双曲线的修正模型叶子飘模型（YZP）对光合光响应曲线进行了拟合，对比了3种模型的最大净光合速率P_max、初始光能利用率α、暗呼吸速率R_d等光合参数。结果表明，RH模型的P_max、α和R_d均较大，并且无法直接得到光饱和点I_s。NRH模型不能很好地模拟光抑制现象，在P_max的模拟上明显偏大，但在α的模拟中比较接近真实值。YZP模型则具有更好的适用性，能较好地模拟光抑制现象。对栓皮栎和刺槐阴、阳叶光合作用光响应曲线研究发现，阳叶的P_max大于阴叶（栓皮栎、刺槐的阳叶P_max分别高出阴叶的24.41%和18.28%），阴叶的α高于阳叶（栓皮栎、刺槐的阴叶α值分别平均高出阳叶的22.08%、15.41%），阴叶的R_d也高于阳叶，尤其在刺槐上表现明显（刺槐阴叶R_d高出阳叶的7.13%）。栓皮栎P_max、R_d和I_s主要受相对湿度和气孔导度的影响，α主要受相对湿度的影响。刺槐的P_max和I_s与相对湿度和气孔导度均呈显著正相关关系。

关键词: 食物网, 河口三角洲, 生态功能, 连通性, 栖息地破碎化, 生境异质性, 生态圈

Abstract: Photosynthesis is one of the important physiological processes of plants, and it can reflect the response of plants to environmental change. Photosynthetic lightresponse model is a main way to evaluate the mechanism of the response of photosynthesis to light and obtain photosynthetic parameters. In this paper, leaf photosynthetic lightresponse curves of Quercus variabilis and Robinia pseudoacacia were measured using a LI-6400XT photosynthetic measurement system in the growing season of 2016 in the southern foot of the Taihang Mountain. The rectangular hyperbola (RH), nonrectangular hyperbola (NRH) and the rectangular hyperbola correction (YZP) models were used to simulate photosynthetic lightresponse curves of the shaded and sunlit leaves. Moreover, the lightresponse parameters fitted by the RH, NRH and YZP models were examined. Compared with the NRH and YZP models, the maximum net photosynthetic rate (P_max), initial light use efficiency (α) and dark respiration rate (R_d) fitted by the RH model were higher. The light saturation point (I_s) could not be derived from the RH model. Photoinhibition could not be simulated by the NRH model, and the value of P_max fitted by the NRH model was significantly larger than that obtained by the YZP model. However, α fitted by the NRH model was close to the measured one. Photoinhibition could be simulated by the YZP model. Compared with the shaded leaves, the P_max values of the sunlit leaves for Q. variabilis and R. pseudoacacia were 24.41% and 18.28% higher, and the α values of their shadedleaves were 22.08% and 15.41% larger, respectively. R_d of the shaded leaves of each species was higher than that of its sunlit leaves, and the R_d value of R. pseudoacacia shaded leaves was 7.13% higher than sunlit leaves. Both P_max , I_s and R_d were correlated with relative humidity and stomatal conductance of Q. variabilis, and α was primarily affected by relative humidity. Both P_max and I_s of R. pseudoacacia had significant positive relationships with relative humidity and G_s.

Key words: ecosphere, connectivity, estuarine delta, ecological function, habitat heterogeneity, habitat fragmentation, food web

任博1,李俊2,同小娟1*,母艳梅1,张劲松3,孟平3. 太行山南麓栓皮栎和刺槐叶片光合光响应模拟[J]. 生态学杂志.

REN Bo1, LI Jun2, TONG Xiao-juan1*, MU Yan-mei2, ZHANG Jin-song3, MENG Ping3. Simulation on photosynthetic lightresponse of Quercus variabilis and Robinia pseudoacacia in the southern foot of the Taihang Mountain.[J]. cje.

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