药用濒危植物桃儿七种群生存状况及种实特性分析

Survival state and fruiting characteristics of endangered medicinal plant Sinopodophyllum hexandrum plant in Tibet plateau

该研究采用野外典型样地调查法结合实验室测定，系统分析了3种不同生境桃儿七种群生存状况和种实特性，以期为促进野生桃儿七种群数量恢复提供科学依据。结果表明：桃儿七在大面积林间空地（种群A）和灌丛（种群C）下种群数量较多，且多为幼龄级个体；而小林隙下（种群B）种群数量较少，且多为老龄级个体，未来发展趋势预测表明桃儿七种群总体呈衰退趋势；种群在小尺度为集群分布而大尺度为随机分布；种群A和C在果实大小、种子数量与质量、发芽特性等方面均优于种群B。根据各种群主要环境因子分析可知，一定光照和肥沃土壤条件有利于桃儿七营养生长与生殖生长。因此，未来可人为营造有利于野生桃儿七种群存活的环境条件，促进种群恢复和资源量增加。

This study was carried out by the methods of typical plots investigation and laboratory test aiming at analyzing the survival state and fruiting characteristics of three Sinopodophyllum hexandram populations in different environmental habitats. Meanwhile, it could provide scientific basis for enhancing wild population quantity recovery. The results showed that more population quantity grow in the habitats of large-area gap （ Population A ） and bushes （ Population C ） with a majority of the young individuals, while the minor-area gap （ Population B） was the opposite. The development tendency of S. hexandrum popt, lations would be the recession in the future. Spatial distribution pattern of populations was chunped at small scales but random at large scales. The indexes of population A and C, as fruit size, the quantity and quality of seeds, germ inability, were all superior to those of population B. Comparing the mainly environ- merit factors of three populations, that favorable environmental factors for vegetative and reproductive growth of S. hexandrum popula- tions were found,especially certain lighting intensity and fertile soil. Theretbre, the favorable environmental habitats for S. hexandrum individuals growth could be artificial to promote the recovery and quantities of S. hexandrum populations in the future.