杉木人工林中微量营养元素的含量、积累和生物循环

微量元素在植物体内参与各种生理生化活动,其作用机制有很强的专一性,是植物正常生长发育所不可缺少和相互替代的。森林生态系统的养分循环中,也包括微量营养元素的循环。本文对杉木林中的微量元素(Fe、Mn、Zn、Cu、B)进行了研究,旨在了解杉木林生态系统中这些元素的含量、积累和分布状况,以及它们在系统中循环的规律,以期进一步完善

CONTENTS, ACCUMULATIONS AND BIOCYCLES OF MICRONUTRIENTS IN A CHINESE FIR PLANTATION

This paper was concerned with micronutrients (Fe, Mn, Cu, Zn, B) in a 21-year-old Chinese Fir plantation. Results are as follows: Boron contents is low in soil and leaves (<0.5ppm). Element contents in the leaves vary with its ages, but not with its grades of forest growth. Efficiency of using micronutrients is high for Chinese Fir (404.0g/t). The net accumulations of micronutrients are nearly the same in Chinese Fir(2.274 kg/ha.a) and underplants (2.145kg/ha.a). The micronutrient biocycle rate is 66.5 percent, the uptake is 5.445kg/ha.a, the retention and restitution are 1.823kg/ha.a, and 3.622 kg/ha.a respectively. According to the use of whole tree, the biomass removal increases by 53.9 percent, and the micronutrient loss 171.9 percent.