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《Acta Ecologica Sinica》 2003-01
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The phenology, reproduction and community characteristics of Changnienia amoena, a rare species in southern part of Shennong-jia Mountain range

XIONG Gao-Ming+1, XIE Zong-Qiang+1, XIONG Xiao-Gang+1,FAN Da-Yong+1, GE Song+2 (1.Laboratory of Quantitative Vegetation Ecology,Institute of Botany, Chinese Academy of Sciences,Beijing 100093,China;2.Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences,Beijing 100093,China).  
Changnienia amoena is a rare species endemic to China, which belongs to Orchidaceae. In order to understand why this plant has been endangered, we studied the phenology,reproduction and community characteristics of C. amoena populations that occurred in southern part of Shennongjia Mountain range. Thirteen plots were sampled to investigate the community composition. Our results showed that C. amoena generally distributed on shaded slope of 15~45°, with altitudes of 1300~1700m. Its buds emerged to above ground at middle or late September. Scapes took place in the mid-November. Flowers bloomed in mid-March of the next year, and leaves started to shed off in late April or early May. New pseudo-bulbs began to appear in late April or early May and matured at middle or late September. Seed capsules ripened in early November. The fruiting percentage was low and varied from 2.3% to 9.5% in two years. One plant produced 1~3 new pseudo-bulbs thus one plant could produce 1~3 scapes per year. The population of C. amoena in Shennongjia region distributed mainly in those forest patches dominated by Platycarya strobilacea, Dendrobenthamia japonica, and Carpinus cordata var. chinensis. These species belongs to North Temperate floristic elements according to Wu's system. Evergreen species was rare in these patches. All of these forest patches were heavily disturbed, and the population of C. amoena was endangered. The number of plants of C. amoena decreased with the increasing of disturbance intensity. Heavy disturbance, low fruiting rate, and low germinating rate were the major causes resulting in the endangered situation of C. amoena. We suggest establish nature reserve in order to restore forest vegetation and to conserve C. amoena.
【Fund】: 国家重点基础研究发展规划资助项目 ( G2 0 0 0 0 4 680 5 );; 中国科学院知识创新工程重要方向资助项目 ( KSCX2 -SW-1 0 9)~~
【CateGory Index】: Q948
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