| 元阳梯田周围不同植物群落氮元素背景值特征及其元素循环 |
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| 引用本文： | 许圆圆,祖艳群,陈建军,李元.元阳梯田周围不同植物群落氮元素背景值特征及其元素循环[J].云南农业大学学报,2012,27(2):270-276. |
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| 作者姓名： | 许圆圆 祖艳群 陈建军 李元 |
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| 作者单位： | 云南农业大学 资源与环境学院，云南 昆明 650201 |
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| 摘 要： | 为了研究元阳梯田周围森林群落氮元素背景值特征状况，了解不同林木类型氮元素循环情况及其对生态系统的影响，笔者研究元阳梯田中心区周边9个不同森林群落优势种叶片、土壤以及枯落物中氮元素含量及各群落元素循环系数及特征。结果表明：（1）在优势种叶片中，氮元素含量的平均值为16.7g/kg，范围为9.9～26.8g/kg。在枯落物中，氮元素含量的平均值为13.5g/kg，范围为7.5～20.5g/kg，叶片和枯落物氮含量平均值依次为：人工林茶园>阔叶林>针叶林。（2）土壤全氮含量平均值在0～20cm和20～40cm分别为3.4g/kg和2.2g/kg；碱解氮含量平均值140.3mg/kg（0～20cm）和102.9mg/kg（20～40cm）。表层土氮含量为：阔叶林>人工林茶园>针叶林。（3）植物叶富集系数的平均值为5.26，枯落物存留系数的平均值为0.87，归还土壤系数的平均值为4.10。3种循环系数大小为：富集系数>归还土壤系数>存留系数。富集系数和归还土壤系数为人工林最大，阔叶林和针叶林接近，3种林型存留系数平均值基本相同。
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| 关 键 词： | 元阳梯田 氮 元素背景值 元素循环 |
Characteristics of Nitrogen Element Background Value and Element Cycling in Plant Communities around Yuanyang Terrace |
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| XU Yuan-yuan,ZU Yan-qun,CHEN Jian-jun,LI Yuan.Characteristics of Nitrogen Element Background Value and Element Cycling in Plant Communities around Yuanyang Terrace[J].Journal of Yunnan Agricultural University,2012,27(2):270-276. |
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| Authors: | XU Yuan-yuan ZU Yan-qun CHEN Jian-jun LI Yuan |
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| Institution: | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China |
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| Abstract: | In order to study the characteristics of nitrogen element background values, understand the nitrogen element cycling and its impact on the ecosystem in different forest types around Yuanyang terrace, the contents of nitrogen element in dominant species leaves, soil and litter in nine forest communities around Yuanyang terrace area were studied, circulating factors and characteristics were analyzed The results showed that: (1) In dominant species leaves, the average content of nitrogen was 16.7 g/kg ranging from 9.9 to 26.8 g/kg with the highest in Clerodendrum bungei leaves and the lowest in Pinus yunnanensisIn the litters, the average content of nitrogen was 135 g/kg ranging from 7.5 to 20.5 g/kg with the highest in Camellia sinensis and the lowest in Pinus yunnanensis communities. The average contents of nitrogen in three forest types were plantation> broad leaved forest> coniferous forest. (2) The average content of total nitrogen in 0-20cm and 20-40cm soil layers was 3.4g/kg and 2.2g/kg; The average soil available nitrogen contents were 140.3mg/kg (0～20cm) and 102.9mg/kg (20～40cm)The contents of total nitrogen and available nitrogen in 0～20cm soil layer were higher than in 20～40cm soil layer. Nitrogen contents in surface soil in the three forest types were broad leaved forest> plantation> coniferous forest. (3) The average enrichment factor, retention factor and coefficient of restitution of the soil were 5.26, 0.87 and 4.10. The sequence was enrichment factor of leaves > coefficient of restitution of soil>litter retention coefficient. The average enrichment factor and restitution factor in plantation were high. The average retention factor of three forest types is similar |
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| Keywords: | Yuanyang terrace nitrogen element background value element cycling |
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