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苏南山区不同斑块中香果树种群的结构与更新

彭仙丽1,任小杰2,张光富1*,李莉2,杨婷1,肖思禹1,王雪峰2,史亚江2#br#   

  1. (1南京师范大学生命科学学院 江苏省生物多样性与生物技术重点实验室, 南京 210023; 2江苏省溧阳市林业工作站, 江苏溧阳 213300)
  • 出版日期:2017-10-10 发布日期:2017-10-10

Population structure and regeneration of Emmenopterys henryi in different patches in  mountainous area of southern Jiangsu.

PENG Xian-li1, REN Xiao-jie2, ZHANG Guang-fu1*, LI Li2, YANG Ting1, XIAO Si-yu1, WANG Xue-feng2, SHI Ya-jiang2#br#   

  1. (1Jiangsu Key Laboratory of Biodiversity and Biotechnology, School of Life Sciences, Nanjing Normal University, Nanjing 210023, China; 2Forestry Station of Liyang of Jiangsu Province, Liyang 213300, Jiangsu, China).
  • Online:2017-10-10 Published:2017-10-10

摘要: 生境片段化形成隔离的斑块状小种群,目前关于珍稀濒危树种不同斑块的种群结构及更新方式研究较少。以种群生命表和生存分析理论为基础,采用空间代替时间和分段匀滑技术,研究苏南山区国家Ⅱ级珍稀濒危植物香果树5个斑块种群的大小结构、生命表及萌枝率。结果表明:不同斑块香果树种群结构存在波动性,种群总体趋于Deevey Ⅱ型,其幼年阶段个体较丰富;香果树种群死亡率和消失率变化趋势基本一致,均出现2个高峰(第Ⅰ和第Ⅴ龄级);其种群生存率单调下降,累计死亡率单调上升,但从第Ⅴ龄级均趋于平缓。不同斑块的萌枝率和Magini更新指数差异显著。尽管萌枝更新可以延缓斑块种群的灭绝时间,但部分斑块的小种群因人为干扰已受到严重威胁。

关键词: 土壤盐分, 棉蕾, Bt棉, 氮代谢, Bt基因, 杀虫蛋白

Abstract: Habitat fragmentation results in isolated and patched small populations. At present, however, little is known about population structure and regeneration mode of rare and endangered tree species in different patches. The static life table of Emmenopterys henryi population was compiled based on population life table and theory of survival analysis by applying age class structure represented by DBH class and smoothing out technique. Meanwhile, sizeclass structure and sprouting ratio of this species in five patches were also examined. The results showed that there was a fluctuation in the structure of E. henryi populations across the five patches. Overall, the survival curve of the population tended to follow the type of Deevey Ⅱ, and the individuals at juvenile stage were abundant. The mortality rate and disappearance rate in the lifespan had similar variation trend, with the peaks in the 1st and 5th age class periods. The survival rate of the population decreased monotonically, whereas the cumulative mortality rate increased monotonically. Nevertheless, the two rates began to be flat from the 5th age class. Additionally, sprouting ratio and Magini index differed markedly across the five patches. Despite longterm persistence by virtue of sprouting regeneration, some patches of small populations have been so seriously threatened that the local populations are on the edge of extinction due to human disturbance.

Key words: Bt protein, soil salinity, Bt gene, flower bud, nitrogen metabolism., Bt cotton