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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。
Plant photosynthesis - light response model is to evaluate the mechanism of plant photosynthesis and access to photosynthetic parameters of the main ways. In this paper, Quercus variabilis and Robinia pseudoacacia plantations in the south of Taihang Mountains were selected as research objects. The photosynthesis-light response curves of the two plantations were measured by LI-6400XT photosynthesis system. By using the hyperbolic model The maximal photosynthetic rate P_ (max), photosynthesis and light response curve of three models were compared by using the leaf model (YZP), RH, NRH and the modified model of rectangular hyperbolic curve. ), Initial solar energy utilization rate α, dark respiration rate R_d and other photosynthetic parameters. The results show that P_ (max), α and R_d of RH model are large, and the light saturation point I_s can not be obtained directly. The NRH model can not simulate the photoinhibition well and is obviously larger in the Pmax simulation, but closer to the true value in the simulation of α. YZP model has better applicability, can better simulate the phenomenon of light suppression. The photosynthesis-light response curves of Quercus variabilis and Robinia pseudoacacia yang and Yang yang showed that the P max of the positive leaves were 24.41% and 18.28 higher than that of the shade leaves respectively (the positive leaves of Quercus variabilis and Robinia pseudoacacia) %), Α of shady leaves is higher than that of male leaves (22.08% and 15.41% of positive leaves, respectively) of positive leaves (Opposite leaves and black leaves of Robinia pseudoacacia), and R_d of shady leaves is also higher than that of positive leaves, especially in Robinia pseudoacacia Obviously (Robinia pseudoacacia R_d higher than the positive leaf 7.13%). The values of P_ (max), R_d and I_s were mainly affected by relative humidity and stomatal conductance, while α was mainly affected by relative humidity. Robinia pseudoacacia P_ (max) and I_s and relative humidity and stomatal conductance showed a significant positive correlation.