2014, 27(4): 565-569.
The photosynthetic rate of Larix olgensis, L. kaempferi and L. gmelinii seedlings were measured in the mountainous area of Hebei province during July to September, 2009. The relevant physiological and morphologic indexes were also investigated to compare their photosynthetic productivities. The results showed that L. gmelinii exhibited the maximum CO2 assimilation capacity, followed by L. kaempferi and L. olgensis, but the differences were not significantly. The physiological and morphologic indexes of these species varied significantly; L. olgensis exhibited the lowest specific leaf weight compared with L. gmelinii and L. kaempferi. The variation in lateral quantity, lateral length, lateral diameter, needle width and needle length among these species reached significantly level, ranked as L. kaempferi > L. olgensis > L. gmelinii. In summary, although the photosynthetic capacity per unit leaf area of L. kaempferi was constricted in this region, the largest whole-seedling leaf area and longest growth period made L. kaempferi grow faster than the other species. The photosynthetic productivity ranked as L. kaempferi > L. gmelinii > L. olgensis.
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