| 厚荚相思中龄林养分分布与生物地球化学循环 |
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| 引用本文： | 何斌,余春和,何荣,刘莉,罗柳娟,刘红英.厚荚相思中龄林养分分布与生物地球化学循环[J].华南农业大学学报,2012,33(1):53-57. |
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| 作者姓名： | 何斌 余春和 何荣 刘莉 罗柳娟 刘红英 |
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| 作者单位： | 1. 广西大学林学院,广西南宁,530004
2. 广西七坡林场,广西南宁,530001 |
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| 基金项目： | 广西自然科学基金，广西教育厅科研基金，"十五"广西林业科学研究项目 |
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| 摘 要： | 采用标准样地法研究了7年生(中龄林)厚荚相思Acacia crassicarpa人工林10种养分元素(N、P、K、Ca、Mg、Fe、Mn、Zn、Cu和B)的分布和生物循环特点.结果表明:1)厚荚相思不同器官营养元素含量为:树叶>干皮>树枝>树根>干材,各器官中大量营养元素含量以N最高,其次是Ca或K,然后是Mg,P最低,微量元素含量则以Mn和Fe最高,其次是Zn和B,Cu最低;2)厚荚相思人工林养分贮存量为1 121.07 kg.hm-2,其中乔木层、林下植物层和凋落物层积累量依次为848.94、116.05和156.08 kg.hm-2,分别占总积累量的75.72%、10.35%和13.92%,林木中不同器官养分元素贮存量排序为:干材>树叶>树枝>干皮>树根;3)厚荚相思人工林养分年吸收量、归还量、存留量分别为261.87、140.59和121.28 kg.hm-2.年-1,循环系数为0.54,周转期为6.04年.因此,厚荚相思中龄林的营养元素利用率较低,归还速率较快,周转期较短,有利于林地地力的恢复和维持.
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| 关 键 词： | 厚荚相思 中龄林 养分 生物地球化学循环 |
| 收稿时间： | 3/1/2011 12:00:00 AM |
Nutrient Distribution and Biogeochemical Cycling in Middle-Aged Acacia crassicarpa Plantation |
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| HE Bin,YU Chun-he,HE Rong,LIU Li,LUO Liu-juan and LIU Hong-ying.Nutrient Distribution and Biogeochemical Cycling in Middle-Aged Acacia crassicarpa Plantation[J].Journal of South China Agricultural University,2012,33(1):53-57. |
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| Authors: | HE Bin YU Chun-he HE Rong LIU Li LUO Liu-juan and LIU Hong-ying |
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| Institution: | 1(1 College of Forestry,Guangxi University,Nanning 530005,China;2 Qipo Forest Farm of Guangxi,Nanning 530001,China) |
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| Abstract: | The standard plot method was used to study the distribution and biological cycling of 10 nutrient elements(N,P,K,Ca,Mg,Fe,Mn,Zn,Cu and B) in the 7-year-old(middle-age)Acacia crassicarpa plantation.The results indicated that concentrations of the 10 nutrient elements in different organs of A.crassicarpa plantation were in the order of leaves>bark>branch>root>stem.The contents of N were the highest,K and Ca the second,Mg and P the lowest for macro-elements,whereas Mn and Fe were the highest,B and Zn the second,and Cu the lowest for micro-elements.The nutrient storage of the plantation was 1 121.08 kg·hm-2,of which overstorey of A.crassicarpa trees stored 848.94 kg·hm-2 accounting for 75.72%,forest floor 116.05 kg·hm-2 account for 10.35%,and standing litter 156.08 kg·hm-2 account for 13.92%.The amounts of nutrient elements in different parts of trees was in the order of stem>leaves>branch>bark>root.The amounts of annual uptake,retention and return of 10 elements in the plantation were 261.87,140.59 and 121.28 kg·hm-2,respectively.The cycling coefficient and recycling period were 0.54 and 6.04.As was observed,the nutrient utilization efficiency in middle-aged A.crassicarpa plantation was lower,but the return rate was higher and the turnover period was shorter,resulting in the recovery and maintenance of forestland fertilization. |
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| Keywords: | Acacia crassicarpa middle-aged plantation nutrients biogeochemical cycling |
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