摘要
对广西高峰林场1.5～4.5年生厚荚相思人工林5种微量元素(Fe、Mn、Cu、Zn和B)的质量分数、积累、分配和生物循环进行了研究。结果表明:厚荚相思不同器官的微量元素质量分数差异较大,以树叶所含有的质量分数最高,其次是树皮、树枝和树根,树干最低;各器官中微量元素质量分数以Mn和Fe最高,Cu最低。厚荚相思人工林林分微量元素积累量为3.749～14.961kg.hm-2,随生长过程中生物量的增加而增大;其中乔木层微量元素积累量占34.20%～41.22%,林下植被层和地表现存凋落物层微量元素积累量分别占25.31%～44.89%和16.78%～33.47%。4个林龄林木各组分微量元素年净积累量分别为0.959、1.070、1.031和1.357kg.hm-2.a-1,年吸收量分别为1.422、3.778、4.506和4.792kg.hm-2.a-1,年归还量分别为0.463、2.709、3.474和3.435kg.hm-2.a-1,利用系数分别为0.989、1.413、1.248和0.777,循环系数分别为0.326、0.717、0.771和0.717,周转期分别为3.107、0.987、1.039和1.796a。因此,厚荚相思人工林微量元素利用率较低,归还速率较快,周转期较短,有利于林地地力的恢复、维持和提高。
An experiment was conducted to study the content, accumulation, distribution and biological cycling of five microelements （Fe, Mn, Zn, Cu and B） in 1.5-year-old to 4.5-year-old Acacia crassicarpa plantations in Gaofeng Forest Farm of Guangxi Province. Results showed that contents of these five microclements in different organs of A. crassicarpa were in the order of leaf 〉 bark 〉 branch 〉 root 〉 stem. The contents of Mn and Fe were the highest, while that of Cu was the lowest in various organs of A. crassicarpa. The total accumulation of microelements in the plantations ranged from 3. 749 to 14.961 kg·hm^-2 and increased with the biomass accumulation in the process of stand growth. Of the total accumulation of microelements, 34.20% - 41.22% was distributed in arbor layer, 25.31% - 44. 89% in forest floor layer, and 16.78% - 33.47% in standing litter layer. Annual net accumulations of microelements in A. crassicarpa plantations of four stand ages were 0.959, 1. 070, 1. 031 and 1. 357 kg·hm^-2·a^-1, the annual absorption of microelements were 1. 422, 3. 778, 4.506 and 4.792 kg·hm^-2·a^-1, the annual returns were 0. 463, 2.709, 3. 474 and 3. 435 kg·hm^-2·a^-1, the utilization coefficients of microelements were 0.989, 1. 413, 1. 248 and 0.777, the cycling coefficient were 0.326, 0.717, 0. 771 and 0.717, and the recycling periods were 3. 107, 0.987, 1. 039, 1. 796 years, respectively. Therefore, the utilization efficiencies of microelements for A. crassicarpa plantations are lower, but the return rate and recycling rate are higher and the turnover period is also shorter, which are suitable for the recovery, maintenance and enhancement of forestland fertilization.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2009年第12期30-34,共5页
Journal of Northeast Forestry University
基金
广西自然科学基金项目(桂科自0640018)
广西教育厅科研基金项目(2006-26)
关键词
厚荚相思人工林
微量元素
生物循环
Acacia crassicarpa plantations
Microelements
Biological cycling
