长汀侵蚀退化区砍伐迹地马尾松种群动态

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 长汀侵蚀退化区砍伐迹地马尾松种群动态 DOI: 10.5846/stxb201706261148 作者: 作者单位: 湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院,福建师范大学地理科学学院,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,中国科学院植物研究所植被与环境变化国家重点实验室 作者简介: 通讯作者: 中图分类号: 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） Population dynamics of Pinus massoniana in the logged forestland of Changting's eroded and degraded region Author: Affiliation: State Key Laboratory of Subtropical Mountain Ecology (Founded by Ministry of Science and Technology and Fujian Province),State Key Laboratory of Subtropical Mountain Ecology (Founded by Ministry of Science and Technology and Fujian Province),School of Geographical Science, Fujian Normal University,School of Geographical Science, Fujian Normal University,State Key Laboratory of Subtropical Mountain Ecology (Founded by Ministry of Science and Technology and Fujian Province),State Key Laboratory of Subtropical Mountain Ecology (Founded by Ministry of Science and Technology and Fujian Province),State Key Laboratory of Subtropical Mountain Ecology (Founded by Ministry of Science and Technology and Fujian Province), Fund Project: Population dynamics and maintenance mechanisms of pioneer species in subtropical red soil hilly region 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 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4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（λ < 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 (λ) declined gradually (λ < 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. 参考文献 相似文献 引证文献