Photosynthetic Productivity of Seedlings of Three Larch Species in the Mountainous Area of Hebei Province

XU Chen-lu; SUN Xiao-mei; ZHANG Shou-gong

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.

1. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China

Received Date: 2012-11-05

Abstract: 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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Reference (20)

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Photosynthetic Productivity of Seedlings of Three Larch Species in the Mountainous Area of Hebei Province

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