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Temperature and moisture interactively affected soil net N mineralization in temperate grassland in northern China.
  审核人:

作者:Wang, C., S. Wan, X. Xing, L. Zhang, and X. Han

期刊:Soil Biology and Biochemistry

年份:2006

卷号:38:1101-1110

文章摘要

Intact soil cores from three adjacent sites (Site A: grazed, Site B: fenced for 4 years, and Site C: fenced for 24 years) were incubated in the laboratory to examine effects of temperature, soil moisture, and their interactions on net nitrification and N mineralization rates in the Inner Mongolia grassland of Northern China. Incubation temperature significantly influenced net nitrification and N mineralization rates in all the three grassland sites. There were no differences in net nitrification or N mineralization rates at lower temperatures (K10, 0, and 5 8C) whereas significant differences were found at higher temperatures (15, 25, and 35 8C). Soil moisture profoundly impacted net nitrification and N mineralization rates in all the three sites. Interactions of temperature and moisture significantly affected net nitrification and mineralization rates in Site B and C, but not in Site A. Temperature sensitivity of net nitrification and N mineralization varied with soil moisture and grassland site. Our results showed greater net N mineralization rates and lower concentrations of inorganic N in the grazed site than those in the fenced sites, suggesting negative impacts of grazing on soil N pools and net primary productivity.

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