梵净山自然保护区珙桐萌蘖繁殖在种群数量中的作用
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中央引导地方科技发展基金项目(黔科中引地[2021]4010);贵州省科学技术基金重点项目(黔科合基础[2019]1455号);贵州省科技厅联合基金项目(黔科合LH字[2017]7325号);铜仁学院植物资源保护与创新利用创新人才团队项目(CXTD[2020-22])


Effects of Sprouting Reproduction on the Population of Davidia involucrata in Fanjingshan Nature Reserve
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    摘要:

    为探讨梵净山自然保护区珙桐(Davidia involucrata)的繁殖策略,揭示萌蘖苗和实生苗在维持种群数量中的作用。采用每木调查法调查贵州省梵净山自然保护区标水岩珙桐种群,根据调查数据绘制径级结构图。以珙桐径级结构代替年龄结构,采用匀滑技术分别编制了萌蘖苗和实生苗种群静态生命表,并绘制存活曲线、死亡率曲线、消失率曲线及4个生存函数曲线。结果显示:(1)珙桐种群年龄结构存在一定的波动性,按萌蘖苗统计则幼龄个体占78.78%,按实生苗统计则幼龄个体占21.45%,两种统计的珙桐种群的生存曲线接近于DeeveyⅡ型。(2)珙桐种群整体是增长的,萌蘖苗Vspi高于Vsepi(6.50%>2.30%)。(3)珙桐种群生存率呈单调下降趋势,萌蘖苗较明显。(4)珙桐种群累计死亡率呈单调上升的趋势,萌蘖苗更明显。(5)珙桐种群生存率和消失率曲线呈单调上升趋势,萌蘖苗和实生苗基本一致。标水岩珙桐种群属于增长型种群,存活曲线为DeeveyⅡ型,后期种群保持稳定,萌蘖繁殖有利于维持种群数量,在维持种群稳定中具有十分重要的作用。

    Abstract:

    To explore the reproductive strategy of Davidia involucrata in Fanjingshan Nature Reserve, so as to reveal the role of sprouting seedling and seeds seedling on the population maintaining, we investigated the population of D. involucrata in Biaoshuiyan of Fanjingshan Nature Reserve by per-tree survey. The diameter class structure chart was drawn according to the survey data, and which was used to replace the age structure. Then, the population static life tables of sprouting seedling and seeds seedling were compiled by using the uniform sliding technique. The survival curve, the mortality curve, the disappearance rate curve and other four survival function curves were plotted. The results showed that: (1) There was a certain fluctuation in the population age structure of D. involucrata. The young individuals were counted 78.78% according to the statistics of sprouting seedlings, while it was 21.45% when according to the statistics of seeds seedlings. However, the survival curve of either kind of statistics was close to Deevey Ⅱ. (2) The population of D. involucrata was growing, and the Vspi of sprouting seedling was higher than that of Vsepi(6.50%>2.30%). (3) The population of D. involucrata was decreased monotonically, and the sprouting seedling was more obvious. (4) The population cumulative mortality of D. involucrata showed a monotonically increasing trend, and the sprouting seedling was also more obvious. (5) The curve of survival rate and vanish rate of D. involucrata showed a monotonically upward trend, both sprouting seedling and seeds seedling kept a same trend. All of the above indicated that, the population of D. involucrata was a growing type, its survival curve belonged to Deevey Ⅱ, and the population would be stable in the later developing stage. The sprouting reproduction was more advantageous to maintain the population seedling quantity, and which had a very important role in maintaining the population stability of D. involucrata.

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卢志宏,漆 江,代 松,等.梵净山自然保护区珙桐萌蘖繁殖在种群数量中的作用[J].西北植物学报,2023,43(6):1044-1051

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  • 在线发布日期: 2023-07-04
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