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引用本文:侯志勇,陈心胜,谢永宏,李旭.洞庭湖湿地土壤种子库特征及其与地表植被的相关性.湖泊科学,2012,24(2):287-293. DOI:10.18307/2012.0218
HOU Zhiyong,CHEN Xinsheng,XIE Yonghong,LI Xu.Characteristics of soil seed bank and its relationship with aboveground vegetation in Lake Dongting. J. Lake Sci.2012,24(2):287-293. DOI:10.18307/2012.0218
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洞庭湖湿地土壤种子库特征及其与地表植被的相关性
侯志勇, 陈心胜, 谢永宏, 李旭
中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 洞庭湖湿地生态观测研究站, 长沙 410125
摘要:
本文研究洞庭湖三种分布于不同水位的主要群落(荻、苔草、虉草)土壤种子库大小组成、垂直分布特征及其地表植被的相关性.结果表明:荻群落土壤种子库密度最高,为44656粒/m2,苔草群落的最低,为15146粒/m2,虉草群落的居中,为31725粒/m2.种子主要分布于土壤表层(0~5 cm),且随土壤剖面深度的增加而迅速递减.三种群落湿地种子库由53种植物组成,分属18科39属,其中多年生物种20种,一或二年生物种33种.在荻、苔草和虉草三种群落中,种子库的多年生物种分别占29.9%、35.2%和38.0%,物种多样性指数分别为0.76、0.70和0.72;地表植被物种多样性指数分别为0.53、0.17和0.45,土壤种子库与相应地表植被相似性系数分别为0.40、0.28和0.52.可见,在洞庭湖这一通江湖泊湿地,多年生地表植被所产生的种子对土壤种子库大小贡献相对有限,种子库可能主要通过其它途径(如水的流动作用)输入.
关键词:  土壤种子库  地表植被  洞庭湖  相关性
DOI:10.18307/2012.0218
分类号:
基金项目:国家重点基础研究发展计划"973"项目(2012CB417005);中国科学院知识创新工程重要方向性项目(KZCX2-YW-435);国家自然科学基金项目(30770362)联合资助
Characteristics of soil seed bank and its relationship with aboveground vegetation in Lake Dongting
HOU Zhiyong, CHEN Xinsheng, XIE Yonghong, LI Xu
Lake Dongting Station for Wetland Ecosystem Observation and Research, Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P. R. China
Abstract:
The size, composition, vertical distribution and species diversity of seed bank as well as its relationship with aboveground vegetation were studied in three dominant plant communities(Miscanthus sacchariflorus, Carex sp., and Phalaris arundinacea) distributing with different water levels in Lake Dongting. The density of seed bank was highest in M. sacchariflorus (44656 seeds/m2), followed by P. arundinacea(31725 seeds/m2) and lowest in Carex sp. (15146 seeds/m2). Seeds in the seed bank distributed mainly within 0~5 cm soil layer and decreased rapidly along with the soil depth. The seed banks of the three communities were composed of 53 species belonging to 18 families, 39 genera. Among them, 20 species were perennial while 33 were annual or biannual. The proportions of perennial species were 29.9%, 35.2% and 38.0% in the soil seed bank of M. sacchariflorus, C. sp. and P. arundinacea communities, respectively. The diversity indexes of seed bank and aboveground vegetation were 0.76 and 0.53 in M. sacchariflorus, 0.70 and 0.17 in C. sp., 0.72 and 0.45 in P. arundinacea, respectively. The similarity indexes between seed bank and aboveground vegetation were 0.28 in C. sp., 0.40 in M. sacchariflorus and 0.52 in P. arundinacea, respectively. The diversity index of seed bank was higher than that of aboveground vegetation and the similarity was relatively low. Therefore, perennial aboveground vegetation has limited contribution to the soil seed bank in large Yangtze-connected lake wetlands, where seeds might be mainly imported into seed bank through other pathways, such as water flow.
Key words:  Soil seed bank  aboveground vegetation  Lake Dongting  similarity
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