塔额盆地野果林不同居群野扁桃土壤种子库及幼苗更新研究
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1.新疆农业大学园艺学院;2.喀什理工职业技术学院;3.新疆特克斯县林业草原局

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2022自治区高校基本科研业务费项目和第三次新疆综合科学考察课题


Study on seedlings regeneration and soil seed bank of Amygdalus ledebouriana of different populations in wild fruit forest in Ta
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(XJEDU2022Z004)和(2021xjkk0501)

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    摘要:

    【目的】明确新疆野扁桃(Amygdalus ledebouriana)土壤种子库及幼苗更新特征,探究影响野扁桃种群更新受限因子。【方法】以新疆塔额盆地的野扁桃为研究对象,通过对野外样地调查、土样采集及母株下幼苗数量、级别统计的方法对新疆野扁桃土壤种子库及幼苗更新进行研究。【结果】(1)野扁桃土壤种子库种子平均密度为96.45粒/m2,托里居群完整种子密度最大,裕民居群被啃食种子密度最大,虫蛀种子仅在塔城居群出现;(2)野扁桃种子主要分布在枯枝落叶层,占种子总量的56.29%,S2(0—5 cm)土层占29.07%,S3(5—10 cm)土层占14.65%,土壤种子水平扩散距离与野扁桃所处坡度成正比;(3)调查的野扁桃幼苗中未发现实生苗,Ⅰ级苗占幼苗总数的51.13%,母株基部50 cm内的范围是野扁桃幼苗集中分布区域。【结论】野扁桃土壤种子库分布特征表现为近母株及地表,幼苗更新的特征也表现为近母株分布,自然条件下,被啃食种子、虫蛀种子和生态位缺失是野扁桃实生苗无法萌发,实生更新受限转而进行萌生更新的主要原因。

    Abstract:

    [Objective] The study aims to clarify the soil seed bank and seedling regeneration characteristics of Amygdalus ledebouriana in Xinjiang, and to explore the limiting factors affecting the population regeneration of Amygdalus ledebouriana. [Methods] In this study, Amygdalus ledebouriana in the Ta'e Basin of Xinjiang was taken as the research object, and the soil seed bank and seedling regeneration of Amygdalus ledebouriana in Xinjiang were studied by means of field plot investigation, soil sample collection and seedling number and grade statistics under mother plant. [Results] (1) The average density of seeds in the soil seed bank of Amygdalus ledebouriana was 96.45/m2. The complete seed density of the Tuoli population was the highest, and the density of seeds eaten by the Yumin population was the highest, and the insect-eaten seeds only appeared in the Tacheng population. (2) The seeds of Amygdalus ledebouriana were mainly distributed in the litter layer, accounting for 56.29% of the total seeds, S2(0-5 cm) soil layer accounted for 29.07%, S3(5-10 cm) soil layer accounted for 14.65 %, The horizontal diffusion distance of soil seeds is proportional to the slope of Amygdalus ledebouriana. (3) No seedlings were found in the investigated Amygdalus ledebouriana seedlings. Grade I seedlings accounted for 51.13% of the total number of seedlings. Amygdalus ledebouriana seedlings were concentrated in the range of 50 cm from the base of the mother plant. [Conclusion] The distribution characteristics of soil seed bank of Amygdalus ledebouriana were near mother plant and surface, and the characteristics of seedling regeneration were also near mother plant distribution. Under natural conditions, gnawed seeds, insect-infested seeds and niche loss were the main reasons why Amygdalus ledebouriana seedlings cannot germinate and the regeneration of seedlings was limited.

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管 岳,申文靖,陆彪,等.塔额盆地野果林不同居群野扁桃土壤种子库及幼苗更新研究[J].西北植物学报,2024,44(6):961-967

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  • 收稿日期:2023-11-16
  • 最后修改日期:2024-01-17
  • 录用日期:2024-01-22
  • 在线发布日期: 2024-04-24
  • 出版日期: 2024-07-01
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