摘要
采用野外定点取样和萌发实验相结合的方法,研究了科尔沁沙地围封沙质草甸土壤种子库和幼苗库的特征.结果表明:土壤种子库总密度为13854±1651有效种子数/m2,而幼苗库的总密度为808±164株/m2,仅为土壤种子库总密度的6%,土壤种子库与幼苗库总密度之间存在显著的差异 F=36.0,n=219,P<0.001 .土壤种子库与幼苗库的植物种数分别为37和44,其中一、二年生草本植物分别占种子库与幼苗库植物种数的62%和50%,而多年生草本植物所占的比例分别为24%和41%,灌木所占的比例很小,分别为14%和9%.土壤种子库与幼苗库种类组成上的相似性系数为0.667,表现出较小的异质性.土壤种子库密度与幼苗库密度之间存在显著的相关性,其间关系可用三次曲线来描述.
In the Horqin sandland,the soil seed bank and the seedling bank in fenced sandy meadow were studied by using methods of sampling quadrats and germinating.The results showed that density of the seed bank was 13 854±1 651 viable seeds/m2,and density of the seedling bank was 808±164 plants/m2,6% of density of the seed bank.Pairedsamples T test indicated that there was a significant difference between the density of the seed bank and that of the seedling bank (F=36.0,n=219,P<0.001).Number of species of the seed bank and the seedling bank were 37 and 44 respectively.Annuals and biennials occupied the ratio of 62% and 50%,perennials of 24% and 41% and shrubs of 14% and 9%,respectively.Sorensens similarity coefficient for species composition in the seed bank and the seedling bank was 0.667,showing little spatial heterogeneity.Regression indicated that the relationship between density of the seed bank and that of the seedling bank could be described by a cubic curve.
出处
《西北植物学报》
CAS
CSCD
2003年第10期1725-1730,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院 百人计划 项目
中国科学院寒区旱区环境与工程研究所知识创新工程项目( 210097)
国家973项目资助 (G2000048704 )
