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杨贤宇,李守中,宋铁燕,王从容,刘聪,吴语嫣,宁秋蕊,姜良超.长汀侵蚀退化区砍伐迹地上马尾松种群动态研究.生态学报,2018,(9).http://dx.doi.org/10.5846/stxb201706261148  
长汀侵蚀退化区砍伐迹地上马尾松种群动态研究
Population dynamics of Pinus massoniana in the logged forestland of Changting’s eroded and degraded region
投稿时间:2017-06-26  修订日期:2017-12-14
DOI: 10.5846/stxb201706261148
关键词马尾松  种群动态  砍伐  积分投影模型  弹性分析  侵蚀退化区
Key WordsPinus massoniana  population dynamics  logging  integral projection model  elasticity analyze  eroded and degraded region
基金项目国家自然科学基金面上项目(31470633); 国家重点研发计划(2017YFC05054)
作者单位E-mail
杨贤宇 湿润亚热带山地生态国家重点实验室培育基地 xianyu_yang@126.com 
李守中 湿润亚热带山地生态国家重点实验室培育基地 lisz126@126.com 
宋铁燕 福建师范大学地理科学学院  
王从容 福建师范大学地理科学学院  
刘聪 湿润亚热带山地生态国家重点实验室培育基地  
吴语嫣 湿润亚热带山地生态国家重点实验室培育基地  
宁秋蕊 湿润亚热带山地生态国家重点实验室培育基地  
姜良超 中国科学院植物研究所植被与环境变化国家重点实验室  
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摘要:
砍伐是人类对植物种群最常见的干扰形式之一,种群结构及其动态在砍伐后会经历快速变化和调整时期。以长汀侵蚀退化地为研究区,基于砍伐迹地上马尾松种群四年生活史调查,利用积分投影模型(IPM,Integral Projection Model)结合传统种群统计分析方法,揭示砍伐迹地上马尾松种群增长率变化过程及个体生命率对种群的影响。结果表明:砍伐迹地上马尾松种群处于衰退状态(?<1),且衰退程度不断加深。4年内幼苗数量大幅度减少,幼年树和成树数量增加。死亡在生活史各个阶段均有出现,幼苗是死亡的主要来源;植株生长量随着个体的增大和时间的增加而增加,生长增量由大到小依次为:成年树,幼年树和幼苗;植株繁殖概率逐年提升,但新生幼苗数量逐年下降。弹性分析显示,个体尤其是幼苗的存活对种群至关重要,小径级植株的正生长有利于种群恢复,大径级植株的正生长不利于种群发展,而负增长和繁殖贡献均十分有限。
Abstract:
Logging is one of the most common forms of human disturbance for plants. Population structure and its dynamics experience rapid changes and regulates following logging. We studied the life history traits and population dynamics of a long-lived dominant tree Pinus massoniana in the red soil eroded and degraded region of China. Demographic data from four annual censuses (2013-2016) were used to parameterize integral projection model (IPM) to determine changes in population growth rate and their contributions to population development. The results showed that: the population growth rate (?) declined gradually (?<1) over time in the logged forestland. During the censuses periods, the number of seedlings decreased substantially, whereas juveniles and adults increased slightly. Mortality was observed during all life stages, mainly in seedlings and small individuals. Diameter growth increased with individual’s size, with adult individuals showing faster growth than those at other life stages. Reproduction probability increased gradually, but the number of new recruits declined. In addition, elasticity analysis revealed that the survival of individuals, especially seedlings, was the key for population growth. The growth of the small individuals positively affected population development, while the growth of large plants had negative effects. There were minimal contributions of shrinkage and fecundity to population growth rate.
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