椰子间作可可下可可光合日变化与环境因子的关系

研究椰子间作可可下的可可光合速率(Pn)和环境因子日变化,探讨间作可可Pn与环境因子的关系,为优化可可栽培技术提供理论依据。结果表明,间作和单作可可Pn日变化均呈双峰曲线,有光合"午休"现象。环境因子与Pn的相关性均不显著(p0.05),间作和单作可可环境因子对Pn的直接作用均为TLRHPARTa,对间作可可Pn的影响是PAR、TL和Ta等相互作用的结果。光合有效辐射是影响间作可可Pn的主要环境因子。在可可的栽培管理中,应发挥主导环境因子的作用。

Relationship between Diurnal Changes of Photosynthesis of Theobroma cacao and Environmental Factors in Coconut Plantation Intercropped with Cacao

The diurnal changes of net photosynthetic rate (Pn) of Theobroma cacao and the environmental factors were measured in the coconut plantations intercropped with cocoa to analyze the relationship between diurnal changes of Pn and environmental factors in a view to providing theoretical basis for optimization of cocoa cultivation under coconut plantation. The results indicated that the diurnal changes of Pn of cocoa in intercropping and monoculture showed a double-peak curve with a slight "midday depression of photosynthesis". There was no significant correlation between environmental factors and the Pn (p>0.05). The direct impact of the environmental factors to Pn was in the order of leaf temperature (TL)> relative humidity (RH) > photosynthetic active radiation (PAR) > atmospheric temperature (Ta) in intercropping and monoculture. The impact of the environmental factors on Pn of the intercropped cacao was the result of the interactions of PAR, TL and Ta. PAR was the dominant environmental factor affecting the Pn of the intercropped cacao. In cocoa cultivation management, high attention should be paid to the role of dominant environmental factors.