水生生物学报2001，Vol.25Issue(2)：152-158,7.
梁子湖优势沉水植物冬季种子库的初步研究
A PRELIMINARY STUDY OF WINTER SEED BANK OF DOMINANT SUBMERGED MACROPHYTES IN LAKE LIANGZI
摘要
Abstract
Seed bank plays an important role in the re-establishment ofdisturbed vegetations. Soil cores were sampled from substrate of Lake Liangzi in Winter (Feb. 1998), and seed densities (general seed bank,including seed,brood-bud,shoot fragments) of Potamogeton maackianus,P. crispus,Ceratophyllum demersum,Hydrilla verticillata, Vallisneria spiralis and Myriophyllum spicatum, which were the dominant submerged macrophytes of the lake,were estimated by germination methods. The main results are as follows. (1) The seed densities varied in different fegions in Lake Liangzi,being 714.4 seeds/m2 in Manjianghu region and 107.5 seeds/m2 in QianJiang region. But in Zhonghu region and within the palisade region of Lake Liangzi Management, the seed densities were 331.9 seeds/m2 and 159.3/m2，respectiively. (2) In the community of submerged macrophytes,seed banks of P. maackianus, C.demersum and P. crispus dominated the whole seed bank,with a density of 198.8,91.7 and 21.4seeds/m2 (3) The general seed banks of each plant population had different structure and ratio. For C.demersum,P.crispus,V.spiralis and H.verticillata, the vegetative reproduction units were the most important,but for P. maackianus and M.spicatum,the ratio of seeds was the highest. All of the six studied species could produce seedlings by seeds and vegetative reproduction units,which resulted in an increase in quantity of the populations. (4) The seed banks are usually dormant in Winter (except P.crispus). In Spring,the seed banks began to germinate and the germination peak occurres from March to April. (5) The submerged macrcphytes seed banks are very complex. Human activities,population size of each plant and fish density can influence greatly the dispersal of seeds and the structure and densities of the seed banks.关键词
梁子湖/沉水植物/冬季种子库Key words
Lake Liangzi/Submerged macrophytes/Winter seed bank分类
农业科技引用本文复制引用
陈中义,雷泽湘,周进,陈家宽..梁子湖优势沉水植物冬季种子库的初步研究[J].水生生物学报,2001,25(2):152-158,7.基金项目
国家自然科学基金重大项目(39893360)、淡水生态与生物技术国家重点实验室项目(9702E2)和国家攻关项目专题(95-008-01-03)资助 （39893360）
