Spatio-temporal variation in a seed bank of a semi-arid region in northeastern Brazil

被引：21
作者：
da Silva, Kleber A. [1 ]
dos Santos, Danielle M. [2 ]
dos Santos, Josiene M. F. F. [2 ]
de Albuquerque, Ulysses P. [2 ]
Ferraz, Elba M. N. [3 ]
Araujo, Elcida de L. [2 ]
机构：
[1] Univ Fed Pernambuco UFPE, Ctr Acad Vitoria, Lab Biodiversidade, BR-55608680 Vitoria De Santo Antao, PE, Brazil
[2] Univ Fed Rural Pernambuco UFRPE, Dept Biol, Area Bot, BR-52171900 Recife, PE, Brazil
[3] Inst Fed Educ Ciencia & Tecnol Pernambuco IFPE, BR-50740540 Recife, PE, Brazil
来源：
ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY | 2013年 / 46卷
关键词：
Species richness; Seed density; Caatinga; Litter; Seedling emergence;
D O I：
10.1016/j.actao.2012.10.008
中图分类号：
Q14 [生态学（生物生态学）];
学科分类号：
071012 ; 0713 ;
摘要：
This study aimed to evaluate variations in the seed bank within a 3-year temporal series in order to answer the following questions: 1) Does the seed bank's species richness and seed density differ among climatic seasons and between years? 2) Are there differences in the richness and density of seed banks between the litter and mineral soil? 3) Can the seed bank's species richness and seed density be explained by characteristics such as the previous year's precipitation and soil depth (litter or mineral soil)? The samples were collected from litter and mineral soil (0-5 cm), in 210 sub-plots, during the dry and rainy seasons of each year (August 2005 through February 2008). Overall, 79 species were recorded. On average, 1168, 304 and 302 seeds.m(-2) were recorded in the seed bank during years I, II and III, respectively. This study showed that the Caatinga's seed bank is rich in herbaceous species, yet species' density and richness are low in the litter. Furthermore, about 43% of the variation in species richness and density was explained by soil depth (litter and mineral soil) and previous years' rainfall. (C) 2012 Elsevier Masson SAS. All rights reserved.
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页码：25 / 32
页数：8
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