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以降香黄檀(Dalbergia odorifera)、顶果木(Acrocarpus fraxinifolius)、格木(Erythrophleum fordii)、红锥(Castanopsis hystrix)和西南桦(Betula alnoides)等树种幼苗为研究对象,对其叶片的光合特征进行研究。结果表明,降香黄檀、西南桦与顶果木具有较高的光饱和点(LSP)及光补偿点(LCP),较为喜光;红锥及格木则具有较低的LCP及LSP,较为耐荫。降香黄檀和顶果木都具有较高的光饱和净光合速率(Amax),但降香黄檀的羧化效率(CE)最高,CO_2补偿点(CCP)最低,气孔导度(gs)及胞间CO_2浓度(Ci)却并不高,这表明其羧化酶较高的CO_2羧化能力是造成其较高Amax的主要原因;而顶果木则是CE、gs及Ci都较高,CCP较低,羧化酶羧化能力与CO_2提供能力都较强,因此光合能力较强。虽然西南桦有最高的gs及Ci,但较高的CCP及较低的CE限制了其光合能力;格木以及红锥则是gs、Ci与CE都较低,CCP较高,羧化能力与CO_2提供能力都较弱,因而光合能力较弱。
The photosynthetic characteristics of leaves of Dalbergia odorifera, Acrocarpus fraxinifolius, Erythrophleum fordii, Castanopsis hystrix and Betula alnoides were studied. the study. The results showed that the Dalbergia glauca and Betula alnoides had higher light saturation point (LSP) and light compensation point (LCP), which were more like the light. The red cone and the grid wood had lower LCP and LSP, . Rhodiola rosea and Cereal rosewood had higher photosynthetic net photosynthetic rate (Amax), but Chardonnus elliottii had the highest carboxylation efficiency (CE), lowest CO 2 compensation point (CCP), stomatal conductance (gs) The intracellular CO 2 concentration (Ci) was not high, which indicated that the higher CO 2 carboxylation ability of carboxylase was the main reason for its higher Amax, whereas the top fruit was higher in CE, gs and Ci and the CCP Lower, carboxylase carboxylase and CO 2 ability to provide strong, so strong photosynthetic ability. Although Betula alnoides had the highest values of gs and Ci, the higher CCP and lower CEs limited their photosynthetic capacities; the Glumes and red cones had lower gs, lower Ci and CE, higher CCP, CO 2 is weak and therefore photosynthetic capacity is weaker.