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幼苗较速生的大叶相思(Acacia auriculiformis)和柠檬桉(Eucalyptus citriodora)的叶绿素含量,总光合强度,净光合强度,全株叶面积和叶面积指数分别比较慢生的台湾相思(A.confusa)和窿缘桉(E.exserta)大;它们的叶绿素a/b值分别较接近光合单位假设模型中的叶绿素a/b值,较有利于两个光系统的配合,有利于光合作用。此外,这两种较速生树苗比较慢生树苗的干物质生产分别大12％和54％,三个月生苗高分别大60％和284％。研究表明光合强度与叶绿素含量呈正相关,并与叶绿素a/b值关系密切;幼苗生长速度与光合强度也呈正相关;窿缘桉叶绿素含量变动范围比光合强度窄。建议在选育工作中试用叶绿素含量及其组成比例代替光合作用指标来筛选高光合、高产量树种或类型。
Acacia auriculiformis and Eucalyptus citriodora had slower chlorophyll content, total photosynthetic rate, net photosynthetic intensity, total plant leaf area and leaf area index, respectively. A. confusa And E. exserta. Their chlorophyll a / b values are closer to the chlorophyll a / b values in the photosynthetic unit hypothesis model, respectively, which is more favorable for the coordination of the two photosystems and is favorable for photosynthesis. In addition, the dry matter production of the two slower-growing saplings was 12% and 54% larger than the slow-growing saplings, respectively, with 60% and 284% of the three-month seedlings respectively. Studies have shown that photosynthetic intensity and chlorophyll content was positively correlated with the chlorophyll a / b value is closely related to the seedling growth rate and photosynthetic intensity is also positively correlated; margin margin of chlorophyll content of eucalyptus than narrower photosynthetic intensity. It is suggested that the selection of high photosynthesis and high yield tree species or types should be tried instead of the indexes of photosynthesis in the breeding work.