长汀生态恢复区不同混交比例针阔混交林内马尾松种群动态及其驱动机制  

Population Dynamics and Driving Mechanism of Pinus massoniana in Coniferous and Broad-Leaved Mixed Forests with Different Mixing Ratios in Changting Ecological Restoration Area

作　　者：刘澳 王嘉铮 卢思航 雷菲娅 宁宏涛 腾渝 李守中[1,2] Liu Ao;Wang Jiazheng;Lu Sihang;Lei Feiya;Ning Hongtao;Teng Yu;Li Shouzhong(State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,Fujian Normal University Fuzhou 350007;School of Geographical Sciences,Fujian Normal University Fuzhou 350007;State Key Laboratory of Grassland Agro-Ecosystems School of Ecology,Lanzhou University Lanzhou 730000;Yuzhong Mountain Ecosystems Observation and Research Station,Lanzhou University Lanzhou 730000;National Demonstration Center for Experimental Geography Education,Fujian Normal University Fuzhou 350007)

机构地区：[1]福建师范大学湿润亚热带山地生态国家重点试验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]兰州大学生态学院草地农业生态系统国家重点试验室,兰州730000 [4]兰州大学榆中山地生态系统野外科学观测研究站,兰州730000 [5]地理学国家级试验教学示范中心(福建师范大学),福州350007

出　　处：《林业科学》2024年第5期89-97,共9页Scientia Silvae Sinicae

基　　金：国家自然科学基金面上项目(31971638)。

摘　　要：[目的]分析我国亚热带生态恢复典型先锋物种马尾松在不同混交比例针阔混交林内的种群动态及其驱动机制,为深入理解亚热带植被重建与恢复进程奠定基础。[方法]基于福建省长汀县生态恢复区4块不同混交比例针阔混交林内马尾松种群调查数据,构建积分投影模型并运用弹性分析、生命表响应试验等方法,探究混交林内马尾松种群动态及其驱动机制。[结果]针阔混交林内马尾松种群整体表现为持续衰退状态(种群增长率λ<1),随着阔叶树种在林分中相对多度增加,马尾松个体平均存活率和平均繁殖率以及λ均呈先上升后下降趋势。弹性分析表明,个体存活对混交林内马尾松种群增长最重要,小径级个体正生长利于种群发展,繁殖对种群增长的影响较为有限。随着阔叶树种相对多度增加,对马尾松种群增长最重要的个体逐渐由幼苗转变为成年树,种群维持风险逐渐增大。生命表响应试验显示,个体生长差异是不同混交林间马尾松种群增长差异的主要来源。[结论]随着阔叶树种混交比例上升,马尾松种群内幼苗和幼年树的比例和重要性持续降低,成年树的比例和重要性不断增加,不同生活史阶段个体生命率的差异化响应驱动马尾松种群动态变化。【Objective】This study aims to lay a foundation for further understanding the process of subtropical vegetation reconstruction and restoration by analyzing the population dynamics and driving mechanisms of Pinus massoniana,a typical pioneer species in subtropical ecological restoration in China,in coniferous and broad-leaved mixed forests with different mixing ratios.【Method】Based on the survey data of P.massoniana population in four coniferous and broad-leaved mixed forests with different mixing ratios in an ecological restoration area of Changting County,Fujian Province,an integral projection model(IPM)was constructed.Elastic analysis and life table response experiment(LTRE)were used to explore the population dynamics and driving mechanisms of P.massoniana in the mixed forests.【Result】The overall performance of the P.massoniana populations in four coniferous and broad-leaved mixed forests was in a continuous decline state(population growth rateλ<1).However,with the increase of the relative abundance of broad-leaved tree species in the stand,the average survival rate,average reproduction rate andλof P.massoniana individuals increased first and then decreased.Elastic analysis showed that the survival of individuals was the most important for the growth of P.massoniana population in the mixed forest.The positive growth of small-diameter individuals was beneficial to the development of the population,while the effect of reproduction on population growth was relatively limited.With the increase of the relative abundance of broad-leaved tree species,the most important individuals for the growth of P.massoniana population gradually changed from seedlings to adult trees,and the risk of population maintenance gradually increased.Life table response experiments showed that the difference in individual growth was the main source of the difference in population growth of P.massoniana among different mixed forests.【Conclusion】With the increase in the proportion of mixed broad-leaved trees,the proportion and

关 键 词：种群动态 混交林 马尾松 积分投影模型 弹性分析 生命表响应试验 

分 类 号：S718.5[农业科学—林学]