山核桃光合生理特性与产量的关系

Relationships between Net Photosynthetic Characteristics and Yield of the Carya cathyensis Sarg

试验在不同海拔高度，分别选取不同树龄的各3株成年山核桃树，并且要求林分平均木大小相近、生长良好且无病虫害的山核桃作为样木。用Li-6400光合作用测定系统对其光合作用进行测定。得出在海拔500～600m中龄树的净光合速率最大为5．128μmol／（m^2·s），此时的产量也最大，为138.1kg／hm^2，表明光合速率和产量呈正相关。

Three sampled walnut trees with different ages were selected in different altitude locations to study the relation between net photosynthetic characteristics and yield, The sampled trees should be in good heath and without diseases and insect pests. Net photosynthetic rates of leaves of walnut were determined by Li -6 400 portable photosynthesis system. The results showed that the maximum net photosynthesis rate of the middle-aged trees was 5, 128μmol/（m^2·s） at the altitude of 500～ 600 m, and correspondingly, the yield of walnut was the highest （138. 1 kg/hm^2）. There existed a remarkable positive relationship between net photosynthesis rate and yield in walnut.