期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 42, 期 12, 页码 2336-2338出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2010.08.032
关键词
Fertilization; Microbial respiration; Nitrogen; Nitrogen additions; Soil respiration
类别
资金
- National Science Foundation
- U.S. Department of Agriculture
- Direct For Biological Sciences
- Division Of Environmental Biology [953331] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0816629] Funding Source: National Science Foundation
We tested how amendments of different forms of nitrogen (N) affect microbial respiration rates by adding six different forms of N (NH4NO3, (NH2)(2)CO (urea), KNO3, NH4CI, (NH4)(2)SO4, Ca(NO3)(2)) to three distinct soils. All inorganic N forms led to a net reduction in microbial respiration, and the magnitude of the observed response (up to 60 % reduction) was consistent across all soils and negatively correlated with N concentration. Urea also reduced respiration rates in nearly all cases, but the effect was attenuated by the associated input of labile organic carbon. We observed decreases in respiration regardless of soil type, the specific N counter ion, N added as NF4+ or NO3-, or the effects of N form on soil pH, suggesting that decreases in respiration rates were mainly a direct result of the increase in soil N availability, rather than indirect effects caused by the form of N added. (c) 2010 Elsevier Ltd. All rights reserved.
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