江苏溧阳山区银缕梅种群结构、分布格局与更新
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摘要
银缕梅为国家I级珍稀濒危树种。以新近发现的江苏溧阳山区银缕梅种群为研究对象,采用时空互代法、方差/均值比的t检验法和Magini更新指数法分析银缕梅的种群结构、分布格局和更新特点。结果表明:该区银缕梅种群结构呈倒J形,属增长型;总体上,种群分布格局呈现明显的集群分布,但随着高度级的增加,其集群强度逐渐减弱。银缕梅更新方式有4种,即实生苗(23.26%)、残桩萌枝(54.26%)、根蘖萌枝(14.73%)和机会萌枝(7.75%),这表明萌枝对种群更新发挥了重要作用。因此,建议通过建立自然保护小区对该区分布的银缕梅种群进行就地保护,同时辅以一定的人工管护措施以促进种群更新。
Parrotia subaequalis,a rare and endangered species,is ranked as the first class on the List of the Important Wild Plants for Conservation in China( first passel). In this paper,the structure,spatial pattern and regeneration of P. subaequalis population recently discovered in Liyang,Jiangsu Province were analyzed by applying the method of spatial sere substituting for time sere,t-test of variance/mean value ratio and Magini index. The results showed that the population presented an inverted-J pattern in height classes,indicating an increasing type in terms of population structure. This species showed aggregation distribution,but its aggregation intensity decreased with the time going from seedlings to trees. The species had four categories of regeneration modes,including seedlings( 23. 26%),crown sprouts( 54. 26%),root suckers(14. 73%) and opportunistic sprouts(7. 75%),suggesting that sprouting plays a key role in population regeneration of P.subaequalis. Therefore,it is recommended carrying out in situ conservation by establishing nature mini-reserve in this area,in tandem with certain artificial management measures to promote its population regeneration.
Parrotia subaequalis,a rare and endangered species,is ranked as the first class on the List of the Important Wild Plants for Conservation in China( first passel). In this paper,the structure,spatial pattern and regeneration of P. subaequalis population recently discovered in Liyang,Jiangsu Province were analyzed by applying the method of spatial sere substituting for time sere,t-test of variance/mean value ratio and Magini index. The results showed that the population presented an inverted-J pattern in height classes,indicating an increasing type in terms of population structure. This species showed aggregation distribution,but its aggregation intensity decreased with the time going from seedlings to trees. The species had four categories of regeneration modes,including seedlings( 23. 26%),crown sprouts( 54. 26%),root suckers(14. 73%) and opportunistic sprouts(7. 75%),suggesting that sprouting plays a key role in population regeneration of P.subaequalis. Therefore,it is recommended carrying out in situ conservation by establishing nature mini-reserve in this area,in tandem with certain artificial management measures to promote its population regeneration.
引文
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[17]李玲,张光富,王锐,等.天目山自然保护区银杏天然种群生命表[J].生态学杂志,2011,30(1):53-58.
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[19]张光富,姚锐,蒋悦茜,等.安徽万佛山不同生境下银缕梅的种内与种间竞争强度[J].生态学杂志,2016,35(7):1744-1750.
[2]龚滨,夏洋洁,张光富,等.中国特有珍稀濒危树种银缕梅种群结构和空间格局[J].生态与农村环境学报,2012,28(6):638-646.
[3]于永福.中国野生植物保护工作的里程碑——《国家重点保护野生植物名录》(第一批)出台[J].植物杂志,1999(4):3-11.
[4]徐惠强.江苏重点保护野生植物资源[M].南京:南京师范大学出版社,2017:1-150.
[5]ZHANG Z Y,ZHANG D,ENDRESS P K.Hamamelidaceae(Flora of China Vol.9.)[M].Beijing:Science Press,2003:27-28.
[6]王齐瑞,樊巍,河南.金缕梅科一新纪录属、种[J].浙江农业科学,2017,58(12):2205,2209.
[7]刘启新.江苏植物志(第2卷)[M].南京:江苏科学技术出版社,2013:1-128.
[8]王坚强,张光富,朱俊洪,等.濒危植物香果树在江苏的分布及其调查初报[J].江苏林业科技,2016,43(1):25-28.
[9]LI W,ZHANG G F.Population structure and spatial pattern of the endemic and endangered subtropical tree Parrotia subaequalis(Hamamelidaceae)[J].Flora,2015,212:10-18.
[10]BUSBY,P E,VITOUSEK P,DIRZO R.Prevalence of tree regeneration by sprouting and seeding along a rainfall gradient in Hawai’i[J].Biotropica,2010,42(1):80-86.
[11]高邦权,张光富.南京老山国家森林朴树种群结构与分布格局研究[J].广西植物,2005,25(5):406-412.
[12]彭仙丽,任小杰,张光富,等.苏南山区不同斑块中香果树种群的结构与更新[J].生态学杂志,2017,36(10):2716-2724.
[13]DEVANEY J L,JANSEN M A K,WHELAN P M.Spatial patterns of natural regeneration in stands of English yew(Taxus baccata L.):Negative neighbourhood effects[J].Forest Ecology&Management,2014,321(6):52-60.
[14]VESSELLA F,SALIS A,SCIRM,et al Natural regeneration and gender-specific spatial pattern of Taxus baccata in an oldgrowth population in Foresta Umbra(Italy)[J].Dendrobiology,2015,73(5):75-90.
[15]NANAMI S,KAWAGUCHI H,TATENO R,et al.Sprouting traits and population structure of co-occurring Castanopsis species in an evergreen broad-leaved forest in southern China[J].Ecological Research,2010,19(3):341-348.
[16]PRIMACK R B,马克平,蒋志刚.保护生物学[M].北京:科学出版社,2014:161-200.
[17]李玲,张光富,王锐,等.天目山自然保护区银杏天然种群生命表[J].生态学杂志,2011,30(1):53-58.
[18]GUO L J,SHAO X H,XUE P P,et al.Root sprouting ability and growth dynamics of the root suckers of Emmenopterys henryi,a rare and endangered plant endemic to China[J].Forest Ecology&Management,2017,389:35-45.
[19]张光富,姚锐,蒋悦茜,等.安徽万佛山不同生境下银缕梅的种内与种间竞争强度[J].生态学杂志,2016,35(7):1744-1750.