杉木人工林地力和养分循环研究进展

概述了近十年来我国杉木人工林有关地力和生产力下降问题的报导;杉木人工林生态系统中营养元素的积累、分配和循环,以及林下植被对地力的影响,从人工林生态系统功能和栽培措施等角度讨论了杉木人工林地力衰退的原因及克服的途径。

A Summary of the Studies on the Plantation Productivity and Nutrient Cycling in Chinese Fir Plantation Ecosystem

The paper sums up the study reports about the productivity decrease, the site fertility decline and the nutrient cycling in Chinese fir plantation ecosystem during the past decade. It analyses the reasons for both the productivity decrease and the site fertility decline as well as the characteristics of the uptake, storage and return of nutrients elements in Chinese fir plantation ecosystem. Besides, it compares the differences in the nutrient cycling rates reported by different authors in various districts. At the same time, the paper evaluates the dynamics of researches on overcoming the site fertility decline. It also indicates that, from the function of Chinese fir plantation ecosystem point of view, there are such shortcomings as less litterfall, lower nutrient constents, smaller decomposition rate and lower ratio between the uptakes and the returns in Chinese fir plantation ecosystem) and that, from the cultivation techniques point of view, the water, soil and fertilizer erosion caused by the traditional controlled burning and the shortcomings in soil management are the main reasons for the site fertility decline. The paper furthermore points out that, by adopting a series of correct cultivation measures, it is feasible to maintain the nutrient cycling balance in Chinese fir plantation ecosystem as well as to keep the standing forest a sustained fast-growing and high-yield one.