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(QuercusliaotungensisKoidz.)、大叶白蜡(FraxinusmandshuricaRupr.)、蒙椴(TiliamongolicaMaxim.)、五角枫(AcermonoMaxim.),以及优势灌木六道木(AbeliabifloraTurcz.)、毛榛(CorylusmandshuricaMaxim.)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。
Using specially designed chambers and an infrared gas analyzer, we examined the photosynthetic responses of six woodyspecies to elevated CO2, from 325 μmol·mol-1 to 650μmol·mol-1. Six temperate forest wdriy species under natural growth conditions in the Qusrcus liaotungensis forest in Beijing Mountainous Areas were tested: Quercus litiotungensis koidz., Fraxinus mandshurica Rupr., Tilia mongolica Maxim., Acer mono Maxim., Abelia buflora Turcz. and Corylus mandshurica. The results showedthat the six species displayed variable degrees of enhancement in net photosynthetic rates to elevated CO2, from 37 % (Abelia bifloraTurcz. ) to 93% (Qusrcus litiotungensis 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.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第2期204-208,共5页
Chinese Journal of Plant Ecology
基金
国家自然科学基金!"八.五"重大项目
393900
关键词
净光合作用
二氧化碳浓度
辽东栎林
北京山区
Net photosynthesis, CO_2 doubling, Quercus liaotungensis koidz, forest, Beijing Mountainous Areas