西双版纳胶-茶群落中茶树的光合特性及其影响因子  

Photosynthesis Characteristics and Impact Factors of Camellia sinensis Leaves in Rubber-Tea Community in Xishuangbanna, China

作　　者：沈守艮[1] 郑征[1] 

机构地区：[1]中国科学院西双版纳热带植物园昆明分部

出　　处：《应用与环境生物学报》2008年第1期32-37,共6页Chinese Journal of Applied and Environmental Biology

基　　金：国家重点基础研究发展计划(973项目,2003CB415100);国家自然科学基金项目(No30170168);云南省自然科学基金项目(2003C0070M);中国科学院知识创新西南基地项目资助~~

摘　　要：胶-茶群落在西双版纳地区有大面积分布,研究该群落中茶树的光合特性及其影响因子,可以为胶茶间作和茶树种植的实践提供理论依据.在自然条件下使用Li-6400便携式光合系统测定了西双版纳低(570m)、高(870m)两个不同海拔高度的胶-茶群落中茶树连体叶片的光合日进程,并对比研究了群落和纯林中茶树叶片的光响应.结果表明,两个群落中茶树叶片的最大净光合速率、暗呼吸速率、光补偿点和光饱和点均显著低于茶树纯林.两个群落中茶树的净光合速率日进程曲线均为"单峰"型,高海拔茶树的光量子通量密度、净光合速率、蒸腾速率和气孔导度均显著高于低海拔茶树的.相关性分析表明,光量子通量密度是引起群落中茶树光合差异的主要因素.群落林下光照的增强提高了茶树的净光合积累.在高海拔地区采用以茶树为主的胶茶种植结构将促进经济效益的提高.Rubber - tea community was largely distributed in Xishuangbanna, Yunnan, China. The study on the photosynthetic characteristics and impact factors of tea leaves in the community can provide theoretical basis for rubber - tea intercropping and tea plantation along. The diurnal variations of photosynthesis of Camellia sinensis leaves were studied in the rubber - tea community at low （570 m） and high （870 m） elevations under natural conditions. The responses of tea in the community and pure tea plantation to light were also compared. The results indicated that the maximum net photosynthetic rate （Pmax） , dark respiration rate （Rd ） , light compensation point （LCP） and light saturation point （LSP） in tea leaves in the rubber- tea community were significantly lower than those of pure tea plantation. The diurnal variations of net photosynthetic rate （P,） in tea leaves of the community at the two elevations showed a single peak. Photo flux density （ PFD）, Pn, transpiration rate （ Tr ） and stomatal conductance （ Gs ） in tea leaves of high elevation were significantly higher than those of low elevation. The correlation analysis demonstrated that PFD was the main impact factor to cause photosynthetic differences in tea leaves from the community between the two elevations. The improved light condition under canopy could increase net carbon gains in tea leaves. Therefore, the rubber - tea plantation with tea as the main at high elevation may increase economic benefit. Fig 3, Tab 3, Ref 24

关 键 词：茶树 净光合速率 日变化 响应 西双版纳 

分 类 号：S571.1[农业科学—茶叶生产加工]