目前测定森林群落光合作用的方法一般可分两种。第一种方法把树冠从上到下分成若干层次,然后分层测定其Co_2的同化作用。这种方法大多为日本学派所应用。由于它借用于农作物,对森林群落来说没有考虑到①同一树木树冠各层次外界条件的差异;②林內树木分布的不同,因此似乎显得 At present, the methods of determining the photosynthesis of forest communities can be divided into two kinds. The first method divides the canopy into several levels from top to bottom, and then stratifies the assimilation of its Co2. This method is mostly used by the Japanese school. Because it is borrowed from crops, it does not take into account the differences in the external conditions at the different levels of the canopy of the same tree in the forest community. The difference in the distribution of the trees in the forest therefore seems to be