摘要
采用样方法收集了安徽万佛山自然保护区常见的206种植物的种子,通过测量种子千粒重,研究了种子大小(seed mass,SM)在不同分类水平及生活型间的变异规律。结果表明:1)SM在植物种间变异较大,从小到大分为A、B、C、D、E、F、G7个数量级,SM平均为21.487g;C级种子(0.1g≤SM<1.0g)最多,共计73种,占35.4%;D级种子(1.0g≤SM<10.0g)次之,共计56种,占27.2%;野菰(Aeginetia indica)种子最小,仅为0.006g;木鳖子(Momordica cochinchinensis)种子最大,重达1775.192g。2)SM在科间(平均种子大小)存在极显著差异(p<0.001),且变异沿系统发育方向呈显著变小趋势(r=–0.079,p=0.048)。其中,SM较大的5个科分别为葫芦科、柿树科、楝科、安息香科和金缕梅科;SM较小的5个科分别为列当科、兰科、秋海棠科、苦苣苔科和灯心草科。3)该研究中植物的生活型分为8种类型。其中,多年生草本优势明显,计83种,占39.9%,SM变异包括A–E5个数量级;一年生草本次之,计60种,占28.8%,SM变异包括A–F6个数量级;灌木第三,计34种,占16.3%,SM变异包括B–F5个数量级。SM在8种生活型间(平均种子大小)也存在极显著差异(p<0.001);从大到小分别为藤本、乔木、灌木、一年生草本、多年生草本、半灌木、一二年生草本、二或多年生草本;从草本、半灌木、灌木、乔木到藤本,SM与生活型具有极显著的正相关性(r=0.220,p<0.001)。4)种类较多的菊科、禾本科、莎草科及蔷薇科,各科内属间SM也存在极显著差异(p<0.001)。本研究结果有助于加深对植物生活史对策中的种子大小对策的理解,提高对森林植被的管理水平,丰富保育生态学的种子恢复理论。
Aims Our objective was to investigate seed mass variation within species, genera and families, as well as its re- lationships with life form and plant phylogeny. Methods Seeds were collected at the Wanfoshan Natural Reservation Region from July to October 2011. Air-dried weight of 100 diaspores, including seeds and indehiscent and single-seeded fruit, was measured for each of three replicates. Seed mass variation and ecological significance were analyzed. Important findings Seed mass varied greatly from 10^-3g to 10^-3 g. The seed mass distribution of various species was normal, as checked by the Kolmogorov-Smirnov Test. The mean weight of 1 000 diaspores was 21.487 g. The seed mass of Momordica cochinchinensis （1 775.192 g） and Aeginetia indica （0.006 g） were the heaviest and lightest, respectively. More than 60% of the species had a mean seed mass between 0.1 and 10.0 g. The seed mass of 105 species was 〈 1.0 g. There were significant differences of seed mass among 68 families and eight life forms, as determined by one-way analysis of variance （p 〈 0.001）. Pearson＇s relative analysis showed a negative relationship between seed mass and phylogeny （r = -0.079, p = 0.048） and a positive relationship between seed mass and life forms （r = 0.220, p 〈 0.001）. A significant difference was also detected at the generic level （p 〈 0.001） in some families, including Compositae, Poaceae, Cyperaceae and Rosaceae.
出处
《植物生态学报》
CAS
CSCD
北大核心
2012年第8期739-746,共8页
Chinese Journal of Plant Ecology
基金
安徽高校省级自然科学研究项目(KJ2011-Z305)
国家大科学工程--中国西南野生植物种质资源库子课题
安徽大别山野生植物种质资源的收集与保存(WGB-1005)资助
关键词
生活型
系统发育
种子大小
万佛山自然保护区
life form, phylogeny, seed mass, Wanfoshan Natural Reservation Region
