人工林长期立地生产力研究概述

本文首先对国内外人工林长期立地生产力问题研究的背景、历史沿革进行了回顾,阐述了从过去讨论单一树种连栽导致的生产力下降和土壤退化问题发展成为关注全球和区域的气候变化、大气污染、自然灾害以及所有与长期立地生产力有关的人工经营措施对长期立地生产力影响这样一个广阔领域研究的历史演变过程,并且列举了目前世界各国一些正在实施的相关研究项目的主要研究内容和目标.然后对长期立地生产力研究有关的概念和术语进行了比较分析,重点阐述了立地、立地生产力、长期森林生产力/持续森林生产力、长期立地生产力/持续立地生产力等概念在长期生产力研究中的意义和涵盖的范围,介绍了国内外一些学者对长期立地生产力研究时间周期的界定,并对我国几个树种(如杉木和毛竹等)的长期立地生产力研究的时间周期进行了探讨.最后简述了国内外在长期立地生产力研究上采用的技术方法、研究策略及今后的发展趋势.

Concept,Background,Current Status and Research Strategies of Long-term Site Productivity of Managed Forests

Many scientists are increasingly focusing on the researche in the maintenance of long-term site productivity of managed forests,which is closely related to the sustainable forest ecosystem management strategies and associated areas.The objective of this paper is to review the research status and its history,with emphasis on the research development from the narrow topic on second-rotation decline in site qualify and stand productivity to the impacts of global climate changes,air pollution,natural disasters and all related management practices on long-term site productivity of managed forest,in which the latter is much broader and more associated with sustainable management strategies than the former.Meanwhile,some current research projects in this field in the world were briefly introduced with its major goals,plans and progress.In the second part of the paper,some comments were made on concepts related to the long-term site productivity,with emphasis on the site,site productivity,long-term forest productivity/sustainable productivity,long-term site productivity.In this part,the definition of research period of long-term site productivity in different researches were introduced and a discussion has been made on the definition of the research period of some Chinese tree species,such as Chinese fir and moso bamboo.In the third part,a brief review on the research techniques,including field trials and date analysis,was made.Conclusions were drawn in this paper by discussing the future research needs,the remaining problems and research strategies in long-term site productivity of managed forests.