从单生和丛生两个生长水平,以湖北省大贵寺国家森林公园野生青檀种群为例探讨了种群的年龄结构、生态位宽度、静态生命表等数量结构特征及变化趋势。结果表明:研究区野生青檀单生植株类群的平均高度为10.26 m,丛生植株类群的平均高度为17.01 m;年龄结构分析表明该青檀种群为稳定种群,其中单生植株类群为增长型,丛生植株类群为衰退型;种群的更新以种子繁殖方式为主;生态位宽度测算结果表明单生植株类群对环境资源的利用略优于丛生植株类群;生命表分析表明单生植株类群幼树发育为成年个体时,幼龄植株具有较高死亡率;丛生植株类群的中龄级个体具有高死亡率。因此,应加强野外人工辅助育苗以提高青檀种子的发芽率及幼苗的成活率,并大力保护中龄级个体,以促进种群的更新和发展。
Abstract
Numeric and structural characteristics of wild Pteroceltis tatarinowii population in Daguisi national forest park in Hubei province were studied at two levels(single individuals and tillers), which include age structure, niche width, static life table and so on, and the development trend of the population was also discussed. The results showed that the average height of single individuals group was 10.26 m and that of tillers group was 17.01 m. The age structure indicated that the population was stable, and the single individuals group was increasing. However, the tillers group was declining. The regeneration of population mainly depended on regeneration of propagation. The niche breadth showed that the single individuals group could utilize more environment resources than the tillers group. From the static life table we knew that there was high mortality rate when young single individuals developed into adults, and the high mortality rate occurred on middleaged tillers. Therefore, some measures such as in situ auxiliary seed reproduction to increase germination rate of seed, and tending single seedlings into adults, and protecting middleaged tillers, must be adopted to regenerate and improve this population. These results could provide scientific guidance for the protection and reasonable utilization of P. tatarinowii
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参考文献
[1]李光友,方升佐,吕家驹,等.立地条件对青檀人工林生物生产力及檀皮产量的影响[J]. 南京林业大学学报:自然科学版, 2001, 25(4): 49-53.
[2]方升佐,李光友,洑香香.立地条件对青檀檀皮中矿质元素含量的影响[J]. 林业科学, 2002, 38(1): 8-14.
[3]Fang S Z, Hou C Y, Fu X X. Effects of Ca2+ concentrations on accumulations of mineral elements in the components of Pteroceltis tatarinowii[J]. Journal of Forestry Research, 2003, 14(1): 46-50.
[4]洑香香,方升佐,杜艳.青檀种子休眠机理及发芽条件的探讨[J].植物资源与环境学报, 2002, 11(1): 9-13.
[5]洑香香,方升佐,汪红卫,等.青檀一年生播种苗的年生长规律[J].南京林业大学学报:自然科学版, 2001, 25(6): 11-14.
[6]方升佐,崔同林,虞木奎.成土母岩和条龄对青檀檀皮质量的影响[J].北京林业大学学报, 2007, 29(2): 122-127.
[7]王长辉.青檀苗期生长规律、栽培试验及其经济效益分析[J].安徽农学通报, 2010, 16(3): 143-145.
[8]王文静,何雅蔷.宝天曼自然保护区青檀林结构特征与物种多样性研究[J].河南农业大学学报,2001,35(4):364-367.
[9]Chai X Y, Chen S L, Xu W. Using intersimple sequence repeat markers to analyze the genetic structure of natural Pteroceltis tatarinowii populations and implications for species conservation[J]. Plant Syst Evol, 2010(285): 65-73.
[10]时宝茹,张辉勇.大贵寺国家森林公园青檀资源保护与对策[J].湖北林业科技, 2006(4): 54-56.
[11]周纪伦,郑师章,杨持.植物种群生态学[M].北京: 高等教育出版社, 1992.
[12]沈泽昊,方精云.基于种群分布地形格局的两种水青冈生态位比较研究[J].植物生态学报,2001,25(4): 392-398.
[13]李先琨,向悟生,唐润琴.濒危植物元宝山冷杉种群生命表分析[J].热带亚热带植物学报, 2002, 10(1): 9-14.
[14]吴承祯,洪伟,射金寿,等.珍稀濒危植物长苞铁杉种群生命表分析[J].应用生态学报, 2000, 11(3): 333-336.
[15]江洪.云杉种群生态学[M].北京: 中国林业出版社, 1992.
基金
收稿日期:2010-09-17修回日期:2010-12-20基金项目:湖北省自然科学研究重大项目 (Z20092601)作者简介:汪殿蓓(1968—),教授,博士。Email: wangdp@xgu.cn。