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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (6): 1775-1781    DOI: 10.7522/j.issn.1000-694X.2013.00264
Biology and Soil     
Effects of Warming on Soil Nitrogen Mineralization under Different Soil Moisture Conditions in the Horqin Sandy Grassland
LI Yu-lin, CHEN Jing, CUI Duo, WANG Xin-yuan, ZHAO Xue-yong
Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

Temperature and moisture are the key factors determining soil nitrogen mineralization rate which affect species composition and primary productivity of sandy grassland. Our objective was to examine the response of soil nitrogen mineralization in the Horqin sandy grassland to temperature increase under different soil moisture conditions, which is essential to predict the effects of global warming and precipitation variation on sandy grassland ecosystem structure and function. Our results showed that net ammonification rates, net nitrification rates and net mineralization rates of soil N increased significantly with soil moisture rising under condition of warming or not. Net ammonification rate of soil N reached the maximum at the moisture of 15.2%. Net nitrification rates and net mineralization rates of soil N, however, reached their maximums at the moisture of 11.8% and decreased at the moisture of 15.2%. Warming by OTC significantly accelerated net ammonification rate, net nitrification rates and net mineralization rates of soil N. But the effects of warming were related to soil moisture. Net ammonification rates under warming condition were significantly higher than those without warming at the moisture of 3.4%、5.1%、8.5%, but significantly lower than those without warming at the moisture of 11.8% and 15.2%. Net nitrification rates and net mineralization rates of soil N under warming condition were significantly higher than those of control at the moisture of 8.5% and 11.8%. At the moisture of 1.7%、3.4%、5.1% and 15.2%, however, there were no significant differences of net nitrification rates and net mineralization rates of soil N between warming and control. This implies that effect of warming on soil N mineralization is significant only at the appropriate moisture conditions in the Kerqin sandy grassland.

Key words:  sandy grassland      net mineralization rate      net nitrification rate      temperature      soil moisture     
Received:  25 February 2013      Published:  10 April 2013
ZTFLH:  S158.5  

Cite this article: 

LI Yu-lin, CHEN Jing, CUI Duo, WANG Xin-yuan, ZHAO Xue-yong. Effects of Warming on Soil Nitrogen Mineralization under Different Soil Moisture Conditions in the Horqin Sandy Grassland. JOURNAL OF DESERT RESEARCH, 2013, 33(6): 1775-1781.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00264     OR     http://www.desert.ac.cn/EN/Y2013/V33/I6/1775

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