摘要
选择库布齐沙漠东段固定沙丘、半流动沙丘和流动沙丘样地,应用空间代替时间的方法研究沙丘演替过程中土壤种子库物种组成、空间分布和数量变化特征,结果表明：沙丘土壤种子库共出现9科22种植物,以一年生草本植物为主,占56.3％～66.7％;不同演替阶段沙丘土壤种子库密度为固定沙丘＞半流动沙丘＞流动沙丘,0～20cm土层密度分别为2275.56±304.51粒/m2、2099.26±364.45粒/m2、1183.71±194.03粒/m2;土壤种子库密度随着土壤深度增加明显降低,主要集中在0～5cm土层,占全部种子库的68.6％～80.1％;不同演替阶段沙丘土壤种子库之间相似性低,相似系数变化范围为0.29～0.48,处于中等不相似水平;地上植被与土壤种子库之间的相似性较高,相似系数变化范围为0.65～0.70,处于中等相似水平.
Using the method of substituting space for time, the species composition and vertical distri- bution pattern in soil seed bank in the different succession stages （fixed dune, semi-mobile dune, mobile dune） were studied in the eastern Kubuqi desert. The results showed that there were 9 families, 22 species in the soil seed bank. Annual herb varied from 56.3% to 66.7%. The soil seed bank density of mobile dune was 1183.71±194.03seed/m^2 , semi-mobile dune was 2099.26±364.45seed/m^2 , and fixed dune was 2275.56±304.51seed/m^2. With the increase of soil depth, density of soil seed bank decreased obviously, mainly in 0～5cm soil layer, accounted for 68.6%～80. 1% of total soil seed bank. Similarity of soil seed bank in different succession stages were less, similarity coefficients ranged from 0.29～0.48, which were considered as having a moderate dissimilarity level. Similarity coefficients between aboveground vegetation and soil seed bank were more larger, similarity coefficients ranged from 0.65～0.70, showed a moderatesimilarity level.
出处
《中国草地学报》
CSCD
北大核心
2015年第4期80-85,共6页
Chinese Journal of Grassland
基金
中国农业科学院科技创新工程草原非生物灾害防灾减灾团队(CASS-ASTIP-IGR2015-04)
中央级公益性科研院所基本科研业务费项目(1610332014024)
关键词
库布齐沙漠东段
土壤种子库
相似性
演替
Eastern Kubuqi desert
Soil seed bank
Similarity coeffieients
Succession
