喀斯特不同土壤厚度小生境下土壤种子库特征  

The Characteristics of Soil Seed Bank in Karst Area under Different Soil Thickness Niches

作　　者：罗杰 陈金艺 郭旭曼 雷颖 刘锦春 LUO Jie;CHEN Jinyi;GUO Xuman;LEI Ying;LIU Jinchun(School of Life Sciences,Southwest University/Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education)/Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region,Chongqing 400715,China)

机构地区：[1]西南大学生命科学学院/三峡库区生态环境教育部重点实验室/重庆市三峡库区植物生态与资源重点实验室,重庆400715

出　　处：《西南大学学报（自然科学版）》2022年第9期2-10,共9页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金项目(31500399);中央高校基本科研业务费专项(XDJK2020B037);重庆市自然科学基金项目(cstc2020jcyj-msxmX0244).

摘　　要：研究喀斯特地区异质性生境下的土壤种子库特征,对于喀斯特地区植被的恢复具有重要的理论意义.本研究采取野外取样和室内萌发的方法对不同土壤厚度小生境下喀斯特灌草群落土壤种子库特征进行了探究.结果表明:①从浅土到深土生境,土壤种子库总密度呈逐渐递增的趋势;同一小生境下,随着土层深度的增加,种子库密度呈现出递减的趋势.②研究区土壤种子库物种组成重要值排序从多到少依次为:菊科、禾本科、其他科,按生活型分类从多到少依次为:多年生草本、一年生草本、灌乔木.③中等土深的小生境下总的土壤种子库的丰富度、多样性和均匀度指数均最高.④不同土壤小生境下不同土层之间的种子库具有较明显的差异性,即在同一土壤生境下的各土层间与不同生境下的相同土层间土壤种子库的相似性均较高,但不同生境下的其他层次大部分呈现出较低的相似性.喀斯特土壤种子库在植被恢复中的潜力较小,该地区植被恢复还需要适度地进行人为干预.Study of the characteristics of soil seed banks under heterogeneous habitats in karst areas has great theoretical significance for vegetation restoration in this area.Field sampling and indoor germination were used to explore the characteristics of soil seed banks under different soil thickness niches in karst shrub-grass communities.The results showed that:①From shallow soil to deep,the total density of the soil seed bank showed a gradually increasing trend;in the same niche,with the increase of soil depth,the seed bank density showed a decreasing trend.②The important values of species composition of soil seed bank in studied area are:Compositae,Gramineae,and other families in descending order;according to life forms:perennial herbs,annual herbs,shrubs and trees are in descending order.③The richness,diversity and evenness index of the total soil seed bank were the highest in the medium soil depth niche.④There were obvious differences between the seed banks at different soil layers under different soil niches.It means,under the same soil habitat,the soil seed bank of each soil layer shared a high similarity with the seed bank of same soil layer of different soil niches,but most of other layers in different habitats showed lower similarities.The results showed that the soil seed bank of karst region has less potential in vegetation restoration,and still needs moderate human intervention.

关 键 词：石灰岩 异质性生境 种子密度 物种多样性 植被恢复 

分 类 号：Q948[生物学—植物学]