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作 者 ：蒋高明, 渠春梅

期 刊 ：植物生态学报 2000年 24卷 2期 页码：204-208

关键词：净光合作用；CO2浓度加倍；辽东栎林；北京；

Keywords:Net photosynthesis, CO2 doubling, Quercus liaotungensis koidz, forest, Beijing Mountainous Areas,

摘 要 ：为揭示我国暖温带地区辽东栎群落若干优势植物光合作用随CO2浓度升高而变化的特点，用自行设计的同化室装置对自然生长状态下的辽东栎(Quercus liaotungensis KOidz．)、大叶白蜡(Fraxinus mandshurica Rupr．)、蒙椴(Tilia mongolica Maxim．)、五角枫(Acer mono Maxim．)，以及优势灌木六道木(Abelia biflora Turcz．)、毛榛(Corylus mandshurica Maxim．)等6种木本植物进行升高CO2浓度处理，测定了这几种植物净光合速率的变化。加倍CO2浓度对6种植物的光合作用有不同程度的促进作用，净光合速率增加的程度从37％到93％不等，以辽东栎受到的促进作用最大，六道木最小，平均增加75％。净光合作用随CO2浓度升高而增加的程度中乔木种类略高于灌木种类。在夏季和秋季进行的日动态测定都表现出加倍CO2浓度对6种木本植物净光合速率的明显的促进作用。

Abstract:Using specially designed chambers and an infrared gas analyzer, we examined the photosynthetic responses of six woody species to elevated CO2, from 325 μmol·mol-1 to 650 μmol·mol-1. Six temperate forest woody species under natural growth conditions in the Quercus liaotungensis forest in Beijing Mountainous Areas were tested: Quercus liaotungensis koidz. , Fraxinus mandshurica Rupr. , Tilia mongolica Maxim. , Acer mono Maxim. , Abelia biflora Turcz. and Corylus mandshurica . The results showed that the six species displayed variable degrees of enhancement in net photosynthetic rates to elevated CO2, from 37% (Abelia biflora Turcz. ) to 93% (Quercus liaotungensis koidz. ), with an average value of 75%. Shrub species were less affected than tree species. Remarkable enhancement in net photosynthetic rates with elevated CO2 were found during the diurnal courses in both summer and autumn.

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