摘要
【目的】探讨林分结构与森林生产力之间的关系及其驱动机制,为合理改善林分结构,优化森林生态系统功能,提高林分生产力提供科学依据。【方法】以东北地区温带森林为研究对象,采用机械布点的方式在东北地区7座温带森林分布的主要山脉上设置了327个调查取样点,调查面积共计32.7 hm^2。研究以26 348株活立木的野外调查数据为基础,利用结构方程模型探讨了基于大尺度条件下物种多样性和结构多样性对森林生产力的作用路径和大小,分析了温度、降水和林分优势高与森林生产力之间的关系及其驱动机制。【结果】在结构方程模型中:(1)物种多样性和结构多样性与生产力之间的关系都呈显著正相关,且二者间有很强的相关性;(2)温度和降水对生产力没有直接影响,而是分别通过影响结构多样性和物种多样性作用于生产力;(3)林分优势高对生产力也无直接影响,通过影响林分结构作用于森林生产力,且影响比温度和降水更大。【结论】中国东北温带森林林分生产力的直接驱动因子是结构多样性和物种多样性,气候和林分优势高是通过作用于林分结构间接影响森林生产力。研究结果为东北地区温带森林的可持续经营和管理提供了理论依据,具有重要的现实意义。
[Objective]The objectives of this paper is to study the relationship between forest structure and forest productivity and its driving mechanism,so as to improve the forest structure,optimize forest ecosystem function,and improve forest productivity.[Method]Then temperate forests in the Northeastern was taken as the research object and a network of 327 survey plots was established on the seven main mountain ranges distributed in temperate forests,with a total area of 32.7 hm^2.Based on the field survey data of 26 348 trees,the structural equation model(SEM)was used to study the path and strength of forest productivity based on species diversity and structure diversity under large-scale conditions.Besides,the relationship between climatic factors and forest productivity and their driving mechanism were also analyzed.[Results](1)Both species diversity and structure diversity showed significant positive correlations with forest productivity,and these two factors were strongly correlated.(2)Temperature and precipitation have no direct impact on productivity,but instead act on productivity by adjusting structure diversity and species diversity.(3)Similarly,dominant height of stand put impacts on productivity by adjusting forest structure and showed stronger influence than temperature and precipitation.[Conclusion]Structure diversity and species diversity are direct driving factors for forest productivity in temperate forests in Northeast China,while climatic factors and dominant height of stand affect forest productivity by influencing forest structure.The results provide a theoretical basis for the sustainable management and management of temperate forests in Northeast China,showing important practical significance.
作者
吴兆飞
张雨秋
张忠辉
何怀江
张春雨
赵秀海
Wu Zhaofei;Zhang Yuqiu;Zhang Zhonghui;He Huaijiang;Zhang Chunyu;Zhao Xiuhai(Research Center of Forest Management Engineering of State Forestry and Grassland Administration,Beijing Forestry University,Beijing 100083,China;Jilin Provincial Academy of Forestry Sciences,Changchun 130033,Jilin,China)
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2019年第5期48-55,共8页
Journal of Beijing Forestry University
基金
国家重点研发计划重点专项项目(2017YFC0504005)
国家自然科学基金项目(31670643)
吉林省科技发展计划项目(20180519020JH)
关键词
温度
降水
林分优势高
物种多样性
结构多样性
林分生产力
结构方程模型
temperature
precipitation
dominant height of stand
species diversity
structure diversity
forest productivity
structural equation model
