新栽培区尾叶桉人工林营养元素积累与分配特征  

Nutrient Accumulation and Distribution Characteristics of Eucalyptus urophylla Plantations in New Cultivated Areas

作　　者：何斌[1] 温远光[1] 周敏毅[1] 

机构地区：[1]广西大学林学院,广西南宁530004

出　　处：《中南林业科技大学学报》2008年第5期11-15,共5页Journal of Central South University of Forestry & Technology

基　　金：国家"九五"科技攻关专题(96-007-04-06);国家教育部留学回国人员科研启动基金[教外司留(1997)832];广西教育厅资助项目

摘　　要：对广西田林县2.4和4.4年生尾叶桉人工林的N、P、K、Ca和Mg等5种营养元素含量、积累量、年净积累量与分配进行了研究.结果表明:尾叶桉不同器官营养元素含量大致为树叶>树皮>树枝>树根>树干;林木各器官中营养元素含量以N最高,其次是Ca、K和Mg,P最低;2.4和4.4年生尾叶桉人工林营养元素的积累量分别为321.09和760.39 kg/hm2,不同器官营养元素积累量的分配随林分年龄的增长发生变化;林分营养元素年净积累量分别为133.79和172.82 kg/(hm2.a),积累量随林分年龄的增长而明显增大;同一器官各营养元素年净积累量与其营养元素积累量变化顺序一致,即为N>Ca或K>Mg>P;2个林分年龄尾叶桉人工林每积累1 t干物质需要5种营养元素总量分别为10.01和9.44 kg,其中对N的需求量最大,P最小.A study was conducted of the concentrations, accumulation, annual net accumulations and distribution of five nutrient elements （N, P, K, Ca and Mg） in 2.4 and 4. 4-year-old Eucalyptus urophylla plantations in Tianlin County, Guangxi Province. The results show that the nutrient concentrations in the various organs of such a tree are in the following order： leaves 〉 hark〉 branch root 〉 stem; that the concentration of N is the highest among the five, followed by that of Ca, K and Mg with that of P being the lowest ~ that their total nutrient accumulations at two different stand ages are respectively 321.09 kg/hm2 and 760. 39 kg/hm2 and the distribution of such accumulations in their organs varies with their different stand ages that their nutrient annual net accumulation, which increases with the stand age, is 133.79 kg/（hm2 · a） at the age of 2.4 and 172.82 kg/（hm2·a） at the age of 4.4; that changes in their annual net accumulation of various nutrients in a same organ accord to those in their various organs, namely, N〉Ca or K〉 P〉Mg; and that the net production of organic matter per ton needs N element the most and P element the least and the total amount of the five elements needed is respectively 10. 01 kg and 9. 44 kg at two stand ages.

关 键 词：森林生态学 尾叶桉人工林 营养元素 积累与分配 广西 

分 类 号：S718.5[农业科学—林学]