濒危植物南方红豆杉种子雨和土壤种子库特征  

Seed rain and soil seed bank of endangered Taxus chinensis var.mairei in Fujian,China

作　　者：岳红娟[1] 仝川[1] 朱锦懋[2] 黄佳芳[1] 

机构地区：[1]湿润亚热带生态-地理过程省部共建教育部重点实验室,福建师范大学地理科学学院,福州350007 [2]福建师范大学生命科学学院,福州350007

出　　处：《生态学报》2010年第16期4389-4400,共12页Acta Ecologica Sinica

基　　金：福建省"十一五"科技重大专项前期研究项目(2005YZ100)

摘　　要：对福建南平大坪村样地和福州旗山样地濒危植物南方红豆杉种子雨动态进行了2a的观测,并在种子雨结束后不久的3月份和种子雨开始降落之前的9月份进行土壤种子库取样。南方红豆杉种子雨持续3个多月,高峰期从11月中旬开始到12月下旬结束,约40d,种子雨绝大部分降落在树冠范围内,种子雨中成熟种子占85%以上,2007年和2008年种子雨强度差异不显著(P>0.05)。南方红豆杉土壤种子库主要集中在树冠范围内,在种子雨刚结束的3月份,土壤种子库主要分布在枯枝落叶层,且密度显著大于其它两层(P<0.05),9月份第2次取样,枯枝落叶层种子库密度明显减少,当年种子雨仅有3%可补充到土壤种子库中,南方红豆杉种子雨中绝大多数种子受到动物取食、人为因素和环境因素的影响而损失掉无法进入土壤种子库。The seed rain and soil seed bank of endangered Taxus chinensis var.mairei were studied in the Daping and Qi moutain in Fujian.The seed rain was investigated using seed traps,and the soil seed bank was examined by collecting soil cores （ 25cm×25cm×4 cm） under the sampling trees.The seed rain of T.chinensis trees lasted for three months with peak period from mid-November to late December.Most seeds of T.chinensis trees dropped within the crown cover area, and 85% seeds fallen were mature seeds.The intensity of seed rain did not differ significantly between 2007 （ （ 252.9 ＋ 185.3） seeds m-2） and 2008 （ （ 228.9 ＋ 127.9） seeds m-2 ） .The soil seed bank of T.chinensis trees also mainly distributed in the range of the crown.In March when the seed rain just finished,the soil seed bank mainly distributed in the litter layer,and its density was significantly larger than that of the other two layers; whereas in September just before the new seed rain started,the soil seed bank density in the litter layer apparently decreased.Only very small portion of the seed rain （3% ） supplied into the soil seed bank,most of the falling seed did not replenish the soil seed bank due to animal predation,human disturbance and enviromental factors.

关 键 词：南方红豆杉 种子雨 土壤种子库 福建 

分 类 号：S791.49[农业科学—林木遗传育种]