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JOURNAL OF DESERT RESEARCH  2007, Vol. 27 Issue (3): 483-490    DOI:
生物土壤与生态     
Study of Soil Nitrogen Mineralization at Different Altitudes on Western Slopes of Helan Mountains, China
WANG Bin1, CHEN Ya-ming2, ZHOU Zhi-yu1
1.School of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730020, China; 2.School of Life Sciences, Lanzhou University, Lanzhou 730000, China
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Abstract  

The Close-Top Incubation method was applied to study the variation of NH+4-N, NO-3-N and net N mineralization at different altitudes on the western slopes of the Helan mountains. The results are summarized as follows: ①The mean values of soil NH+4-N and NO-3-N decreased with elevation decreasing at the altitudes of between 1 370 m and 2 940 m. ②Net N mineralization rate decreased rapidly first and then increased with elevation decreasing, it took on “V” shapes from elevation 1 370 m to 2 940 m. Net N mineralization rate was the highest (0.272 mg·kg-1·d-1) at 2 940 m and the lowest(0.001 mg·kg-1·d-1) at 2 100 m, it increased with decreasing elevation below 2 100 m and reached 0.136 mg·kg-1·d-1 at 1 370 m. ③Regression analysis indicated that soil mineral nitrogen content had a closely positive relationship with soil water content, soil organic matter, soil total nitrogen, soil density, plant population density, plant aboveground biomass, and a closely negative relationship with soil density and soil pH; however, the net N mineralization rate had no correlation with soil water content, soil organic matter, soil total nitrogen, soil density, and soil pH.

Key words:  Close-Top Incubation method      NH+4-N      NO-3N      net N-mineralization rate      Helan mountains      
Received:  16 January 2006      Published:  20 May 2007
ZTFLH:  S153.61  
Articles by authors
WANG Bin
CHEN Ya-ming
ZHOU Zhi-yu

Cite this article: 

WANG Bin;CHEN Ya-ming;ZHOU Zhi-yu. Study of Soil Nitrogen Mineralization at Different Altitudes on Western Slopes of Helan Mountains, China. JOURNAL OF DESERT RESEARCH, 2007, 27(3): 483-490.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2007/V27/I3/483

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