几种树木的树皮中绿色组织的光合特性初探

测定10个树种树木上的三年生枝条树皮内绿色组织的叶绿素含量、光合速率和枝干的呼吸速率的结果表明：10个树种树皮内叶绿素含量为0.0649～0.3460mg·g^-1（FW）,叶绿素a/b为1.05～1.91,均低于叶片或针叶;树皮内绿色组织的光合速率为0.21（红松）～2.06（水曲柳）μmol（O2）·m^-2·s^-1,枝干呼吸速率1.76（红松）～3.21（落叶松）μmol（O2）·min^-1·g^-1（FW）。树皮内绿色组织的光补偿点（LCP）、光饱和点（LSP）低于叶片,而表观量子效率（AQY）高于叶片或针叶。据此认为,树皮内绿色组织适应于阴生环境,所以有较强的耐阴能力。

A Preliminary Studies on Photosynthetic Characteristics of Chlorenchyma in Several Tree Barks

Chlorophyll content, photosynthetic rate and respiration rate were investigated in tree barks of threeyear-old twigs within tree species. The results showed that the chlorophyll contents and Chl a/b in bark chlorenchyma were 0.0649-0.3460 mg·g^-1 （FW） and 1.05-1.91 respectively, which were lower than in leaves or needles of the same twigs. Net photosynthetic rate of chlorenchyma and respiration rate of stem were 0.21 （Pinus koraiensis）-2.06 （Fraxinus mandshurica） μmol （O2）·m^2·s^-1 and 1.76 （pinus koraiensis）-3.21 （Larix gmelini） μmol （O2）-min^-1·g^-1 （FW） respectively. Light compensation point （LCP） and light saturation point （LSP） of chlorenchyma photosynthesis in barks were lower than those in leaves of the same twigs, while apparent quantum yield （AQY） of chlorenchyma photosynthesis in barks was higher than that in leaves or needles of the same twigs. It suggested that chlorenchyma in tree barks was adapted to shade environment, and was tolerant to shade light.