Wang Xin, Yuan Qing-Jun, Sun Kai, Guo Zeng-Xiang, Chi Xiu-Lian, Huang Lu-Qi
Tianjin University of Traditional Chinese Medicine Tianjin 301617,China State Key Laboratory Breeding Base of Dao-di Herbs,National Resource Center for Chinese Materia Medica,China Academy of Chinese Medical Sciences Beijing 100700,China.
State Key Laboratory Breeding Base of Dao-di Herbs,National Resource Center for Chinese Materia Medica,China Academy of Chinese Medical Sciences Beijing 100700,China.
Zhongguo Zhong Yao Za Zhi. 2019 Jul;44(14):2987-2995. doi: 10.19540/j.cnki.cjcmm.20190505.101.
The study aims to investigate spatial distribution pattern and age structure of wild Angelica sinensis in Gansu province.Ten plots each with an area of 100 m2 were set and the spatial coordinates of all wild A. sinensis individuals were measured within each plot. Based on plant individual mapping data,we explored the spatial distribution pattern and its differences between different life history stages of wild A. sinensis in Gansu province by using nearest neighbor distance statistics. Correlation analysis were carried out to explore the relationship between spatial aggregation degree and topographic factors. We also distinguished individuals to three life history stages( i.e. seedlings,adults and boltings) and then test the differences among/between them using nonparametric test.(1)We found that the dominant spatial distribution pattern of wild A. sinensis population in Gansu was aggregated distribution. There was no significant correlation between spatial aggregation degree of wild A. sinensis and altitude,slope and aspect. There was no significant difference between the average distance from seedlings to their nearest bolting individuals; the average distance from adult individuals to their nearest seedlings was significantly larger than the average distance from adult individuals to their nearest adult individuals; and the average distance from bolting individuals to their nearest adult individuals was significantly smaller than the average distance from bolting individuals to their nearest bolting individuals.(2)The age structure was showed as a declining population,characterized by less seedlings and bolting individuals,while more adult individuals within population. The population characteristics of wild A. sinensis,characterized by aggregated distribution pattern and senescent type of age structure,are disadvantage to its population development. The factors,such as habitat specialization,human activities and intraspecific competition,which shapes the current population characteristics,may increase the threatened status of wild A. sinensis. We suggest to strengthen the protection of wild A. sinensis.
本研究旨在调查甘肃省野生当归的空间分布格局和年龄结构。设置了10个面积为100平方米的样地，并测量了每个样地内所有野生当归个体的空间坐标。基于植物个体测绘数据，利用最近邻距离统计方法，探讨了甘肃省野生当归不同生活史阶段的空间分布格局及其差异。进行相关分析以探讨空间聚集度与地形因子之间的关系。我们还将个体分为三个生活史阶段（即幼苗、成年植株和抽薹植株），然后使用非参数检验来检验它们之间的差异。（1）我们发现甘肃省野生当归种群的主要空间分布格局为聚集分布。野生当归的空间聚集度与海拔、坡度和坡向之间没有显著相关性。幼苗到最近抽薹个体的平均距离之间没有显著差异；成年个体到最近幼苗的平均距离显著大于成年个体到最近成年个体的平均距离；抽薹个体到最近成年个体的平均距离显著小于抽薹个体到最近抽薹个体的平均距离。（2）年龄结构呈现为衰退型种群，其特征是种群内幼苗和抽薹个体较少，而成年个体较多。野生当归的种群特征表现为聚集分布格局和衰老型年龄结构，不利于其种群发展。塑造当前种群特征的栖息地特化、人类活动和种内竞争等因素，可能会增加野生当归的受威胁程度。我们建议加强对野生当归的保护。
