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首页> 外文会议>International Conference on Regional Carbon Budgets; 20060816-18; Beijing(CN) >Photosynthetic characteristic of dominant tree species and canopy in a temperate mixed forest
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Photosynthetic characteristic of dominant tree species and canopy in a temperate mixed forest

机译：温带混交林优势树种和冠层的光合特性

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Based on the light-photosynthesis response measurement at leaf level, combined with eddy covariance measurement over- and under-canopy, the researches on photosynthesis of single tree and forest canopy were made. There were significant differences among studies tree species, especially between pine and broadleaved trees. Mongolian oak presented a high light compensation point L_(cp) (28μmol·m~(-2)·s~(-1)), light saturation point L_(sp) ( > 1800 μmol·m~(-2)·s~(-1)), and maximal net photosynthetic rate P_(max) (9.96μmol·m~(-2)·s~(-1)), which suggested that it was a typically heliophilous plant. Mono maple presented a highest apparent quantum efficiency a (0.066), but lowest, L_(cp) (16μmol·m~(-2)·s~(-1)), L_(sp) (≈800μmol·m~(-2)·s~(-1)), and P_(max) (4.51μmol·m~(-2)·s~(-1)), which suggests that it was a heliophobous plant. Korean pine showed a lowest a value, but higher P_(max), which suggested that it was a semi-heliophilous plant. At the canopy level, the values of both a and P_(max) approached the upper limit of reported values in temperate forests, while L_(cp) was within the lower limit. It showed a high efficiency of low light utilization. The photosynthetic characteristics for canopy were well consistent with that of leaves. Both showed a high ability of photosynthesis. It is an important reason for that this over 200-year-old cool-temperate forest still keep a strong ability of carbon assimilation. However, environmental stresses, especially high vapor pressure deficit could reduce photosynthetic ability of leaves and canopy significantly.
机译：基于叶片水平的光合作用响应测量结果，结合冠层上，下冠层的涡度协方差测量，对单树和森林冠层的光合作用进行了研究。研究树种之间存在显着差异，尤其是在松树和阔叶树之间。蒙古栎具有较高的光补偿点L_（cp）（28μmol·m〜（-2）·s〜（-1）），光饱和点L_（sp）（> 1800μmol·m〜（-2）·s 〜（-1））和最大净光合速率P_（max）（9.96μmol·m〜（-2）·s〜（-1）），表明它是典型的嗜油性植物。单枫具有最高的表观量子效率a（0.066），但最低的L_（cp）（16μmol·m〜（-2）·s〜（-1）），L_（sp）（≈800μmol·m〜（- 2）·s〜（-1））和P_（max）（4.51μmol·m〜（-2）·s〜（-1）），表明这是一种日光植物。红松的最低值，但P_（max）较高，表明它是半嗜油性植物。在冠层水平上，a和P_（max）的值均接近温带森林中报告值的上限，而L_（cp）处于下限之内。显示了低光利用的高效率。冠层的光合特性与叶片的光合特性非常一致。两者均显示出高的光合作用能力。一个重要的原因是，这个拥有200多年历史的温带森林仍然保持着强大的碳同化能力。但是，环境胁迫，特别是高蒸气压亏缺，可能会显着降低叶片和冠层的光合能力。

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