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用Ｂｅｃｋｍａｎ８６５型红外线ＣＯ２分析仪测定了三种不同森林立地区八种不同土壤类型上生长的杨树（小×黑）的净光合速率。结果表明，生长在各立地条件下杨树树冠四个方向的净光合速率不同，生长在同一森林立地区中不同土壤类型上的杨树净光合速率不同，生长在不同森林立地区中杨树的净光合速率也不同。生长在３２区、４１区和５区中杨树树冠四个方向的平均净光合速率分别为０．２１７８、０．１７４２、０．１３４８ｍｇｍ－２ｓ－１。在相同气候条件下，净光合速率的差异反映了土壤肥力的不同；在不同立地区间，净光合速率的差异反映了立地的好坏。杨树净光合速率的大小与其立地质量密切相关，因此，可以把净光合速率用于评价立地质量
The net photosynthetic rate (Pn) of poplars (small × black) grown on eight different soil types in three different forest stands was measured using a Beckman Model 865 infrared CO2 analyzer. The results showed that the net photosynthetic rate of poplar canopy growing in different locations was different, and the net photosynthetic rate of poplar growing on different soil types in the same forest standing area was different. The net photosynthetic rate The rate is also different. The average net photosynthetic rate of poplar canopy growth in Zone 32, Zone 41 and Zone 5 were 0.2178, 0.1674, 0.1348mgm-2s-1, respectively. Under the same climatic conditions, the difference of net photosynthetic rate reflects the difference of soil fertility. The difference of net photosynthetic rate reflects the site’s quality at different sites. The net photosynthetic rate of poplar is closely related to its site quality, so net photosynthetic rate can be used to evaluate site quality