Study on the Mechanism of Maintaining Long-term Productivity of Plantation:Background,Present Condition and Trends

A great deal of attention had been paid on the stability of plantation in the world.Whether the long-term productivity could be maintained was an important aspect in the study on plantation.If the plantation leaded to soil degradation and if conifers cause soil acidification had been the focuses debated in the world.Based on the data collected,the authors described the present research on long-term productivity of plantation in the world,including (1) the studies on strategy,methodology,basic process of ecosystem,(2)change of site quality when plantation was established,including handling of harvest residues,site preparation,tending,thinning,forest harvest,tree species of plantation and effects of plantation community structure on site productivity.Various research achievements,conclusions and viewpoints were summarized in this paper.The research trends and research fields about long-term site productivity of plantation were also summed up.