植物生态学报 ›› 2000, Vol. 24 ›› Issue (2): 204-208.

• 论文 • 上一篇    下一篇

北京山区辽东栎林中几种木本植物光合作用对CO2浓度升高的响应

蒋高明,渠春梅   

  • 发布日期:2000-02-10
  • 通讯作者: 蒋高明

Photosynthetic Response of Six Woody Species to Elevated CO2 in Quercus liaotungensis Forest in the Beijing Mountainous Areas

JIANG Gao-Ming and QU Chun-Mei   

  • Published:2000-02-10
  • Contact: JIANG Gao-Ming

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。

关键词: 净光合作用, CO2浓度加倍, 辽东栎林, 北京

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.

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