研究广西南宁市马占相思人工林5种微量元素(Fe，Mn，Zn，Cu和B)的分布和生物循环特征以及随林龄的变化趋势。结果表明: 1)林木各组分微量元素含量表现为树叶＞枯枝＞干皮＞活枝＞树根＞干材,各组分中微量元素Mn含量最高,其次是Fe,Zn和B,以Cu最低; 2)林地土壤微量元素Fe含量最高,其次是Mn,Zn和B,以Cu最低; 3)4，7和11年生马占相思人工林林分微量元素的总贮存量依次为13.953,22.357和28.835kg·hm-2,其中乔木层微量元素贮存量占47.37%～58.68%,林下植被和凋落物微量元素贮存量分别占14.76%～23.54%和26.63%～29.10%; 4)4年生马占相思人工林微量元素贮存量主要集中在树叶和树枝,7和11年生则主要集中在树干和树根; 5)3个林龄林分微量元素年净积累量依次为1.536,1.750 和1.652kg·hm-2a-1,林木各组分微量元素年净积累量总的变化趋势为树干＞树枝或树根＞树叶＞树皮,同一组分各微量元素年净积累量变化顺序一致,即Mn＞Fe＞Zn(B)＞Cu; 6) 3个林龄林分微量元素年吸收量分别为5.423,5.862和5.273kg·hm-2 a-1,年归还量分别为3.771,4.112和3.737kg·hm-2a-1,利用系数分别为0.821,0.479和0.312,循环系数分别为0.695,0.701和0.709,周转期分别为1.753,2.979和4.522年。
Distribution and biological cycling of five microelements(Fe，Mn，Zn，Cu and B) as well as their changes with growth of stands in Acacia mangium plantation of three different stand ages(4-year-old，7-year-old and 11-year-old) were studied in the city of Nanning，Guangxi．The results showed that concentrations of these five microelements in different components of A．mangium plantation were in the order of leaves > dead branch > bark >alive branch > root > stem．In plant，concentration of Mn was the highest among the five elements，followed by Fe,Zn and B，while Cu was the lowest in various components of A．mangium plantation．In the soil, concentration of Fe was the highest，then Mn，Zn，B，and Cu concentration was the lowest among six elements. The total microelements storage at three stand ages plantations were 13.953，22.357，and 28.835 kg·hm-2，respectively． Of the total storage of microelements, 47.37%～58.68% was distributed in arbor layer，14.76%～23.54% at forest floor layer，26.63%～29.10% at standing litter layer．The storage of microelements in A. mangium varied with different stands growth stages，most microelements storage in leaves and branches at 4-year-old，while they gradually moved gradually in stem and root at 7-year-old and 11-year-old. Annual net accumulations of microelements in three stand ages plantation were 1.652，1.750 and 1.536 kg·hm-2a-1，respectively．Comparison of microelements annual net accumulation in different components was in the order of stem > branches or roots >leaves > bark．Changes in annual net accumulation of various microelements in the same component was similar to that in various components，Mn＞Fe＞Zn or B＞Cu．The annual absorption of microelements in three stand ages plantations were 5.423，5.862 and 5.273 kg·hm-2a-1，respectively．The annual returns equaled to 3.771 , 4.112 and 3.737 kg·hm-2a-1， respectively. The microelement utilization coefficients were 0.821，0.479 and 0.312,respectively. The recycling periods were 1.753，2.979 and 4.522 years，respectively.
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