人工林地力衰退研究

通过查阅大量文献，在前人对人工林地力衰退研究的基础上，论述了国内外有关人工林地力衰退研究的历史及现状；从不同的角度论述了人工林地力衰退的原因，如不合理的营林措施、连栽、纯林等；并在此基础上综述了人工林地力衰退的防治研究，如调整林分结构、营造混交林、改善现有营林制度等；概述了人上林地力衰退的最新进展及今后的研究方向。

Researches on the Productivity Decline of Artificial Forests Site

This paper deals with the productivity decline of artificial forests site. According to some related documents and the farmer's study, some research about this field in history and now can be found in this disquisition, which also, from different point of view, studies in the reason of the productivity decline of artificial forests site, such as unreasonable method of management, overlap, pure forest and so forth. More still, some directions and keyways are proposed for further studies on how to resolve this problem, for example, adjusting stand structure, planning mixed forest, improving the system of planning and so on. It also summarizes the new headway and research direction in future of the productivity decline of artificial forests site.