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| Characteristics and Interrelation of Shallow Soil Organic and Total Nitrogen of Picea crassifolia Forest in the Qilian Mountain, Gansu, China |
| Niu Yun1,2, Liu Xiande1,2, Zhao Weijun1,2, Zhang Xuelong2 |
1. College of Forestry, Gansu Agricultural University, Lanzhou 730070, China;
2. Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Zhangye 734000, Gansu, China |
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Abstract In order to clarify distribution areas of Picea crassifolia forest impact on its soil carbon and nitrogen in the Qilian Mountain through horizontal scale, we selected typical P. crassifolia forest which lives in the eastern and western of the Qilian Mountain as research objects. Through field sampling and laboratory analysis, this paper discussed characteristics and coupling relationships of shallow soil organic and total nitrogen of P. crassifolia forest in the Qilian Mountain. The results showed that: (1)Organic carbon content decreases with the increasing depth of soil profile in the eastern and western of the Qilian Mountain, but significant differences between the soil layers are not identical. The organic carbon content of the soil layer were 73.57±17.17 g·kg-1 and 45.85±11.93 g·kg-1 at 0-40 cm. The organic carbon reserves of soil profile had no obvious changes rule in the eastern and western of the Qilian Mountain, the organic carbon reserves of the soil layer were 205.51±39.44 t·hm-2 and 134.93±25.80 t hm-2 at 0-40 cm. (2) Soil total nitrogen content change with soil depth and different soil and the significant change rule is the same with the soil organic carbon content changes rule. The total nitrogen content of the soil layer were 4.56±0.88 g·kg-1 and 2.81±0.66 g·kg-1 at 0-40 cm. The soil total nitrogen reserves change rule is the same with the soil organic carbon reserves change rule. The total nitrogen reserves of the soil layer were 12.77±2.08 t·hm-2 and 8.38±1.56 t·hm-2 at 0-40 cm. (3) Different soil layer C/N ratio with different significant change rule is the same in the eastern and western of the Qilian Mountain. The C/N values were 15.92±1.24 and 16.10±2.07 and the C/N ratio size mainly depends on the organic carbon content. The linear analysis showed that the soil organic carbon and total nitrogen content were significant positive correlation relationship between them, the regression model Y=aXb(p<0.01) could be used to depict their correlations. The results are expected to provide theoretical basis and data to support the management and administration of water conservation forests edificators, P. crassifolia in the Qilian Mountain.
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Received: 29 July 2013
Published: 20 March 2014
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Corresponding Authors:
刘贤德（Email：liuxiande666@163.com）
E-mail: liuxiande666@163.com
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2014, Vol. 34 
