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首页> 外文期刊>Science in China. Series D, Earth sciences >Photosynthetic characteristics of dominant tree species and canopy in the broadleaved Korean pine forest of Changbai Mountains
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Photosynthetic characteristics of dominant tree species and canopy in the broadleaved Korean pine forest of Changbai Mountains

机译：长白山阔叶红松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 over- and under-canopy eddy covariance measurements, research on photosynthetic characteristics of single trees and forest canopy was conducted. The relationship between light intensity and photo-synthetic rates for leaves and canopy can be well fitted by a non-rectangular hyperbola model. Mongolian oak presented a high light compensation point, L_(cp) (28 μmol·m~(-2)·s~(-1)), a light saturation point L_(sp) ( >1800 μmol·m~(-2)·s~(-1)), and a maximal net photosynthetic rate P_(max) (9.96 μmol·m~(-2)·s~(-1)), which suggest that it is a typical heliophilous plant. Mono maple presented the highest apparent quantum efficiency α (0.066) but the lowest, L_(cp) (16 μmol·m~(-2)·s~(-1)), L_(sp) (≈800 μmol·m~(-2)·s~(-1)), and P_(max) (4.51 μmol·m~(-2)·s~(-1)), which suggest that it is heliophilous plant. Korean pine showed the lowest α value but a higher P_(max), which suggest that it is a semi-heliophilous plant. At the canopy level, the values of both α and P_(max) approached the upper limit of reported values in temperate forests, while L_(cp) was within the lower limit. Canopy photosynthetic characteristics were well consistent with those of leaves. Both showed a high ability to photosynthesize. However, environmental stresses, especially high vapor pressure deficits, could significantly reduce the photosynthetic ability of leaves and canopy.
机译：基于叶片水平的光合作用响应测量，结合冠层过度和冠层涡度协方差测量，对单树和森林冠层的光合特性进行了研究。非矩形双曲线模型可以很好地拟合叶片和冠层的光强与光合速率之间的关系。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植物。单枫具有最高的表观量子效率α（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）），表明它是嗜油性植物。红松的α值最低，但P_（max）较高，表明它是半嗜油性植物。在冠层水平上，α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。冠层的光合特性与叶片的光合特性非常一致。两者都显示出高的光合作用能力。但是，环境压力，尤其是高蒸气压缺陷，可能会大大降低叶片和冠层的光合能力。

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