摘要
该文对13种元素在40年生洋槐人工林中的积累、分布和生物循环进行了研究.结果表明,林分对元素的年吸收量为197.479 9kg/hm^2,年存留量为41.798 9kg/hm^2,年归还量为155.681 0kg/hm^2.各元素平均循环速率为0.79.每生产1t干物质所需元素量为20.3kg.
The accumulation,distribution and biological cycling of 13 nutrient elements in a 40-year-old Robinia pseudoacacia plantation have been studied.Results show that the annual ab- sorption ammount of nutrient elements in the forest is 197.47kg/hm^2,the retained 41.798 9kg/ hm^2,the restitution 155.681 Okg/hm^2 and the average biological cycling velocity of all the ele- ments 0.79.One ton dry-matter accumulation needs 25.1kg of nutrient elements.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
1997年第S2期76-80,共5页
Journal of Beijing Forestry University
关键词
洋槐
生态系统
营养元素
生物循环
Robinia pseudoacacia
ecosystem
nutrient
biological cycling
