新疆天山野果林准噶尔山楂种群结构与动态分析
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新疆师范大学“十三五”校级重点学科生物学招标课题(17SDKD0204);


Structure and Dynamic Analysis of Crataegus songarica K. Koch Population in Tianshan Wild Fruit Forest of Xinjiang
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    摘要:

    为了明确准噶尔山楂(Crataegus songarica K.Koch)种群的结构特征和动态规律,该研究在新疆伊犁霍城县大西沟境内的天山野果林带东端设置5.25 hm2大样地,对准噶尔山楂种群进行逐木调查,采用匀滑技术编制种群静态生命表,绘制存活曲线以及死亡率、消失率曲线,对4个生存函数进行生存分析,并根据种群动态量化和时间序列模型预测种群数量动态。结果显示:(1)天山野果林带东端的准噶尔山楂种群Ⅰ龄级占总体数量的65.5%,Ⅱ龄级数量出现骤减,仅占总体数量的6.5%,研究区内准噶尔山楂种群总体表现为增长型年龄结构,趋于DeeveyⅡ型存活曲线。(2)研究区内准噶尔山楂种群的死亡率和消失率曲线变化基本一致,共有4个死亡高峰,分别在Ⅰ龄级、Ⅵ龄级、Ⅸ龄级和Ⅻ龄级,最高峰出现在Ⅰ龄级幼苗时期,死亡率高达89.9%。(3)4个生存函数曲线表现出前期锐减、中期稳定、后期衰退的特点,同时在时间序列分析中,随着时间推移,种群未来老龄个体逐渐增多,老化趋势较为明显。研究认为,准噶尔山楂种群现阶段的生长呈增长趋势,但种群的长期稳定维持存在困难,建议适当补充幼苗、幼株,减少对成年树的砍伐破坏,从而为种群的保育和恢复提供保障。

    Abstract:

    In order to understand the structure of the population and analyze its current survival situation, we conducted this investigation in the field survey data with a total area of 5.25 hm2 in the east end of Tianshan wild fruit forest in Yili of Crataegus songarica K.Koch populations, and static the life table of population by smoothing out technique, drawing the survival curve, mortality and disappearance rate curve parameters, and the survival analysis of 4 survival functions, using the population dynamic quantization and time series prediction analysis of population dynamics. The results showed that: (1) in the east end of Tianshan wild fruit forest, the middle and old age individuals in C.songarica population were less, namely the class Ⅰ of individuals accounted for 65.5% and the class Ⅱ droped quickly to 6.5%. Therefore, the population structure belongs to the growth type and the survival curve of C.songarica populations tended to be DeeveyⅡ type in the research area; (2)The changes in the mortality and disappearance rate curves are basically the same in the research area, with a total of 4 death peaks at the class Ⅰ, class Ⅵ, class Ⅸ and class Ⅻ, respectively. And the highest peak occurred at the class Ⅰ, being 89.9%; (3)The results of the 4 survival function curves showed that the population of C. songarica had the characteristics of early decline, mediumterm stability, post recession early, and the time series analysis showed that the old class population would increase in the future. Research shows that the growth of C. songarica urgently needed to supplement seedlings or young individuals and to prohibit felling adult individuals so as to provide guarantee for the conservation and recovery of C. songarica population.

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杨 蕾,吕海英,李 进,等.新疆天山野果林准噶尔山楂种群结构与动态分析[J].西北植物学报,2018,38(12):2314-2323

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  • 在线发布日期: 2019-01-24
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