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J Integr Plant Biol, 1995, 37 (12): -, Research Article
Study on the Dynamics and Rhythms of Midmontane Wet Evergreen Broad-Leaved Forest at Xujiaba, Ailao Mountains, Yunnan
Wu Bang-xing
According to data of long-term observation, the dynamics and the rhythms of the wet evergreen broad-leaved forest in respect of seed germination, seedling growth, growth laws, and phenological rhythms of the mature trees of constituent species were analyzed. The species numbers of the seeds, germinable seeds and germinated seeds of the forest in rainy season were larger than those in dry season. The growth rate of the seedlings was faster in rainy season as well indicating a season most favourable for the growth of seedlings. The growth of trees was a process of inter-specific competition, self-regulation and self-thinning. The long and indistinctive phenologieal phases of the mature trees differed from those short and distinctive phenological phases of the broad-leaved forests in the temperate. Its continuous flowering, fruiting and fruit-falling were similar to the phenological rhythms of seasonal rain forests in Xishuangbanna. However, leaf-shedding of the seasonal rain forests in Xishuangbanna, the evergreen broad-leaved forests and the temperate broad-leaved forests was in spring (February ~March), in Winter (November ~ December) and in autumn (September~October) respectively. Based on the characteristics in the phenological rhythms of the species and their responses to the climates, the three eeo-phenological types were divided as: 1. The warm temperate eeo-phenological type, whieh accounts for 82 % of the total species number (50); 2. The temperate ecophenological type, 12%; 3. The cool temperate eco-phenological type, 0. 6 %.
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