杉木林地持续利用问题的研究和看法

本文概述了我国近年来杉木人工林有关地力和生产力下降、杉木人工林生态系统营养元素循环及林下植被对地力维护作用的研究,从人工林生态系统功能和栽培措施角度讨论了杉木人工林林地的持续利用问题。

Summary of the Studies on the Plantation Productivityand Nutrient Cycling in Chinese Fir Plantation Ecosystem

The paper sums up the results of a study on the productivity decrease,site fertilitydecline and the nutrient cycling in Chinese Firplantation ecosystem during the past decade.It analyses the causes of both the productivity decrease and the site fertility decline as well asthe characteristics of the uPpstake,storage and return of nutrient elements in Chinese Firplantation ecosystem.Besides,it compares the differences among the nutrient cycling ratesreported by different authors in various districts.At the same time,the paperevaluates thedynamics of researches on overcoming the site fertility decline.Italso indicates that,in viewof the function of Chinese Fir plantation ecosystem,there are such shortcomings as less litte-rfall,lower nurrient contents,slower decomposition rate and lower ratio between the up-stake and the return in Chinese Fir plantation ecosystem.In addition,the water,soil andfertilize eroson caused by the traditional controlled burning and the shortcomings in soilmanagement are the main cause for the site fertility decline.Furthermore,it points outthat,by adopting a series of correct cultivation measures,it is feasible to maintain the nutri-ent cycling balance in Chinese Fir plantation ecosystem as well as to keep a sustained fast-growth and highyield.