陈雪莲,徐六一,郝焰平,章 健,姜春武,潘 婷

(安徽省林业科学研究院,安徽 合肥 230031)

马尾松光合作用光响应曲线模型拟合

陈雪莲,徐六一*,郝焰平,章 健,姜春武,潘 婷

(安徽省林业科学研究院,安徽 合肥 230031)

为了探讨不同的光响应曲线模型对马尾松无性系不同生长期光合特性的适用性,采用LI-6400便携式光合仪器分别测定了7月、9月和11月马尾松的光响应曲线,并选用二次多项式回归模型(QPM)、分段函数模型(SFM)、直角双曲线模型(RHM)、非直角双曲线模型(NRHM)、直角双曲线修正模型(MRHM)和指数函数模型(EM)来进行最适光响应曲线模型的选择。结果表明：要准确获得马尾松不同生长期的光响应参数需选择不同的光响应曲线模型,7月、9月和11月份马尾松最适合的光响应曲线模型分别是MRHM、EM和QPM。

马尾松；光响应曲线；模型拟合

Abstract： The photo-response curves ofMassonpinein July, September and November were respectively measured by using LI-6400 portable photosynthesis system. These photo-response curves were fitted by quadratic polynomial regression model (QPM), subsection function model (SFM), rectangular hyperbola model (RHM), non-rectangular hyperbola model (NRHM), modified rectangular hyperbola model (MRHM), and exponential function model (EM), respectively, and the optimum models were selected out based on their fitting effect. The results illustrated that different photo-response curve models should be selected to accurately obtain the photo-response parameters ofM.pinein different growth periods. The optimum models fitting the photo-response curves ofM.pinein July, September and November were MRHM, EM and QPM, respectively.

Keywords：Massonpine; Photo-response curve; Model fitting

光合作用是植物生长过程中的关键生理过程,光照强度是其主导因子。光响应曲线是净光合速率随着光合有效辐射改变而变化的反应曲线,通过对其进行测定,可以分析计算出最大光合速率(Pnmax)、光饱和点(LSP)、光补偿点(LCP)、表观量子效率(AQY)和暗呼吸速率(Rd)等重要参数来帮助了解植物光合机构的运转状况、植物的光合效率及其对光的适应性等生理机制[1-3]。为了获得这些参数,国内外研究人员已建立了诸如二次多项式回归模型、直角双曲线模型、直角双曲线修正模型、非直角双曲线模型和指数模型等许多光响应曲线模型[3]。这些模型都存在着对某一个或某几个参数估计欠佳的缺点。……