光合作用是绿色植物利用光能把吸收的二氧化碳和水同化为有机物并释放氧气的过程。据报导,绿色植物的个体组成中,从根部吸收的无机物约占10％,而其余90％左右是直接或间接来自光合作用生成的有机物。杉木也不例外(表一)。因而对杉木光合性状的全面了解,可以为杉木壮苗培育,密度配置,混交林设计及扶育间伐提供理论依据,从而达到速生丰产之目的。 Photosynthesis is the process by which green plants use light energy to assimilate absorbed carbon dioxide and water into organic matter and release oxygen. It has been reported that in the individual composition of green plants, about 10% of the inorganic material is absorbed from the roots, while the remaining 90% are organic compounds generated directly or indirectly from photosynthesis. Chinese fir is no exception (Table 1). Therefore, a comprehensive understanding of the photosynthetic characteristics of Chinese fir can provide a theoretical basis for fir seedling cultivation, density allocation, mixed forest design and thinning for conservation so as to achieve fast-growing and high-yielding purposes.