关帝山不同海拔土壤碳矿化和微生物特征

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摘要以山西省关帝山不同海拔的8个样地土壤为研究对象，分析不同海拔土壤碳氮含量、土壤碳矿化和细菌、真菌、放线菌、固氮菌、硝化细菌和反硝化细菌6类微生物量的变化.结果表明，海拔为2163m时，土壤有机碳和活性碳1（LC1）最高，分别为74.41和6.72g/kg，在海拔2700m总氮含量最高为6.54g/kg.土壤碳矿化累积量和碳矿化速率因海拔的升高而显著增加（P<0.05），土壤碳矿化累积量和活性碳2（LC2）之间有显著正相关.土壤细菌、放线菌和固氮菌的数量在海拔为1791m时最高，分别为3.41×10⁶、1.90×10⁶和1.21×10⁶个/g，细菌、真菌、放线菌和固氮菌的数量随着海拔的升高而逐渐下降，与海拔之间呈显著负相关；相反，硝化细菌和反硝化细菌数量却逐渐增加，在海拔为2700m时最高，分别为1.37×10⁴和6.02×10³个/g，它们与海拔和总氮之间的关系呈显著正相关（P<0.01）.总之，土壤有机碳、总氮、碳矿化累积量、硝化细菌和反硝化细菌随海拔显著增加，而细菌、真菌、放线菌和固氮菌随海拔的变化呈相反的趋势.

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	李君剑
	杜宏宇
	刘菊
	严俊霞
	李洪建

关键词 ：海拔, 土壤碳矿化, 微生物量, 活性碳

Abstract：Eight soil samples from different elevations were collected in Guandi Mountain, Shanxi Province. We measured soil organic and liable carbon, total nitrogen, carbon mineralization and microbial populations (including bacteria, fungi, actinomyces, azotobacter, nitrifying and denitrifying bacteria) along an altitude gradient. The results showed that the highest soil organic and liable carbon 1(LC1) at an altitude of 2163m were 74.41 and 6.72g/kg, respectively. The highest total nitrogen was 6.54g/kg at 2700m altitude. Both the accumulation and rate of soil carbon mineralization increased significant with the increase of altitude. There was a significantly positive correlation between soil carbon mineralization and liable carbon 2 (LC2). At an altitude of 1791m, the most populations of bacteria, actinomyces and azotobacter were 3.41×10⁶, 1.90×10⁶ and 1.21×10⁶ cfu/g, respectively, however, there were the lowest nitrifying and denitrifying bacteria (4.05×10³ and 1.79×10³ cfu/g, respectively). Soil bacteria, fungi, actinomyces and azotobacter demonstrated significantly negative correlations with an altitude. However, both soil nitrifying and denitrifying bacteria were positively correlated with the altitude and total nitrogen. In summary, soil organic and liable carbon, total nitrogen, carbon mineralization accumulation, nitrifying and denitrifying bacteria increased along an altitudinal gradient, however, the contrary patterns were demonstrated among bacteria, fungi, actinomyces and azotobacter.

Key words： altitude soil carbon mineralization soil microbial population liable carbon

收稿日期: 2017-09-28

X172

基金资助:国家自然科学基金资助项目（41771548）

通讯作者: 李君剑,副教授,lijunjian@sxu.edu.cn E-mail: lijunjian@sxu.edu.cn

作者简介: 李君剑(1975-),男,山西汾阳人,副教授,博士,主要从事土壤生态学研究.发表论文35篇.

引用本文:

李君剑, 杜宏宇, 刘菊, 严俊霞, 李洪建. 关帝山不同海拔土壤碳矿化和微生物特征[J]. 中国环境科学, 2018, 38(5): 1811-1817. LI Jun-jian, DU Hong-yu, LIU Ju, YAN Jun-xia, LI Hong-jian. Soil organic mineralization and microbial characteristics along an altitudinal gradient in Guandi Mountain. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1811-1817.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I5/1811

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