摘要
采用聚集度指标与种群结构动态量化法,分析了黄河三角洲潮间带柽柳灌丛的分布格局与结构动态变化。结果表明:(1)在潮间带,柽柳种群从幼苗、小灌木至中灌木都服从集群分布,大灌木为随机分布;柽柳个体幼苗多生长在母体周围,以母体为中心进行繁衍,随着径级的增加,种群个体间的竞争增加,聚集度减小,逐渐呈现随机分布。(2)柽柳种群结构呈纺锤型;高度级失稳率指数显示幼苗和小灌木有很高的衰退速率,随着群落的演替发展,龄级较大的柽柳优势地位将被削弱。(3)种群动态预测表明,种群明显处于衰退的早期阶段,中小灌木的个体数量减少,大灌木个体数增加,达到数量高峰;虽然群落在短时期内会保持稳定,但大灌木(或老龄个体)的数量大幅减少后,柽柳种群将面临重度衰退。
Based on the data of Tamarix chinensis in the intertidal zone of coastal wetlands in Yellow River Delta,ascertainingpopulation patterns and dynamic changes were investigated.The results are as follows.(1)Seedlings,small and middle shrubsperformed a pattern of clustering distribution;large ones were a pattern of random because of competition increasing.Most ofseedlings grew in the maternal surrounding.(2)T.chinensis’age structure was a spindle type.Highness class structure indicatedthe rates of decline of seedlings and small shrubs were high.With the development of the community,the dominance of largerones would be weakened.(3)Population dynamics prediction indicated that the population was in the early depression stage;thenumber of large-sized shrub was expected to increase,whereas the number of trees in other size classes was expected todecrease.Although the community will remain stable in a short period of time,T.chinensis population will face severe recessionafter the numbers of the larger shrubs(or old individuals)having a drastic reduction.
作者
刘亚琦
刘加珍
陈永金
靖淑慧
冯若昂
毛甘霖
LIU Yaqi;LIU Jiazhen;CHEN Yongjing;JING Shuhui;FENG Ruoang;MAO Ganlin(School of Environment and Planning, Liaocheng University, Liaocheng 252000, China)
出处
《生态科学》
CSCD
2017年第1期153-158,共6页
Ecological Science
基金
国家自然科学基金(40901276)
聊城大学基金(318011407)
大学生创新创业计划(201510447014
SF2014078)
关键词
柽柳种群
黄河三角洲
潮间带
分布格局
结构动态
Tamarix chinensis population
Yellow River Delta
intertidal zone
distribution patterns
population structure
