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姜在民,和子森,宿昊,赵涵,蔡靖.濒危植物羽叶丁香种群结构与动态特征.生态学报,2018,38(7):2471~2480 本文二维码信息
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濒危植物羽叶丁香种群结构与动态特征
Population structure and dynamic characteristics of endangered Syringa pinnatifolia Hemsl.
投稿时间:2017-04-25  修订日期:2017-11-16
DOI: 10.5846/stxb201704250753
关键词羽叶丁香  濒危植物  种群结构  存活曲线  生存分析  动态指数
Key WordsSyringa pinnatifolia  endangered species  population structure  survival curve  survival analysis  dynamic index
基金项目林业公益性行业科研专项(201204308)
作者单位E-mail
姜在民 西北农林科技大学生命学院, 杨凌 712100  
和子森 西北农林科技大学林学院, 杨凌 712100
新疆维吾尔自治区林业有害生物防治检疫局, 乌鲁木齐 830000 
 
宿昊 西北农林科技大学林学院, 杨凌 712100  
赵涵 西北农林科技大学林学院, 杨凌 712100  
蔡靖 西北农林科技大学林学院, 杨凌 712100
秦岭国家级生态定位站, 杨凌 712100 
cjcaijing@163.com 
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摘要:
羽叶丁香(Syringa pinnatifolia Hemsl.)是中国特有的珍稀濒危物种,首次对中卫香山和贺兰山甘沟保护区两地的天然种群进行调查,通过建立种群静态生命表,绘制种群存活曲线描绘其种群结构特征,利用种群数量动态预测和时间序列分析定量研究其未来的发展趋势。结果显示,中卫香山种群属于增长型,贺兰山甘沟种群属于衰退型,二者对外界干扰均比较敏感。两地羽叶丁香种群均不同程度地缺乏幼苗,种群发展主要靠中老龄个体维持,存活曲线都趋向于Deevey-Ⅱ型,死亡率曲线和危险率曲线均显示随着年龄的增长,各龄级呈波状上升趋势,且中卫香山种群波动更明显,生存分析也显示中卫香山种群更早进入衰退期,结合生境气候条件,贺兰山甘沟地区更适宜羽叶丁香的生存。动态指数和时间序列分析显示羽叶丁香种群具有前期缺乏,中期稳定,后期衰退的动态特征,幼龄个体的缺乏是导致其濒危的重要原因之一。因此,建议在目前封山育林保护基础上,加强羽叶丁香高效繁育技术研究,并适当进行人工抚育,以保证其种群的正常更新。
Abstract:
Syringa pinnatifolia Hemsl. is a unique rare and endangered species in China. In this study, surveys on the natural population of S. pinnatifolia in the Gangou Preserve in the Helan Mountain and Xiangshan in Zhongwei city were conducted for the first time. Characteristics of population structure were described by establishing a static life table and drawing a population survival curve. Their future development trends were researched quantificationally by population dynamic prediction and time series analysis. The results showed that the Xiangshan population fit the growing type, and the Helan Mountain population fit the declining type. Both populations were sensitive to external interference. The population development of S. pinnatifolia was primarily maintained by middle-and old-aged individuals, with a lack of seedlings to different degrees. The population survival curves tended to be the Deevey-Ⅱ type. Mortality and risk curves both showed that the mortality at each age level rose in a fluctuating manner as age increased, and the range of fluctuation in the Xiangshan population was the most significant. Survival analysis also showed that Xiangshan population entered the decline phase earlier than the Helan Mountain population. Combined with the habitat conditions, the Helan Mountain region was more suitable for the survival of S. pinnatifolia. Dynamic indexes and the results of time series analyses indicated that the population of S. pinnatifolia had the following dynamic characteristics:early stage, declining; middle stage, stability; and late stage, recession. The lack of young individuals was one of the main reasons for its endangerment. Consequently, suggestions are put forward based on the closure of hillsides to facilitate afforestation, the strengthening of research on highly efficient breeding technology of S. pinnatifolia, and the implantation of artificial rearing measures to ensure the normal development of its population.
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