关帝山不同海拔土壤碳矿化和微生物特征

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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

Received: 28 September 2017

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	LI Jun-jian
	DU Hong-yu
	LIU Ju
	YAN Jun-xia
	LI Hong-jian

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LI Jun-jian,DU Hong-yu,LIU Ju等. Soil organic mineralization and microbial characteristics along an altitudinal gradient in Guandi Mountain[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1811-1817.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1811

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