Neff J C,Townsend A R,Gleixner G,et al.Variable effects of nitrogen additions on the stability and turnover of soil carbon[J].Nature,2002,419:915-917.
[5]
Hartley I P,Hopkins D W,Sommerkorn M,et al.The response of organic matter mineralization to nutrient and substrate addi-tions in sub-arctic soils[J].Soil Biology and Biochemistry. 2010,42:92-100.
Mack M C,Schuur E A G,Bret-Harte M S et al.Ecosystem car-bon storage in arctic tundra reduced by long-term nutrient fertil-ization[J].Nature,2004,431:440-443.
?gren G,Bosatta E,Magill A H.Combining theory and experi-ment to understand effects of inorganic nitrogen on litter de-composition[J].Oecologia,2001,128:94-98.
[10]
Weand M P,Arthur M A,Lovett G M,et al.Effects of tree spe-cies and N additions on forest floor microbial communities and extracellular enzyme activities[J].Soil Biology and Biogeo-chemistry,2010,42:2161-2173.
[11]
Bradley K,Drijber R A,Knops J.Increased N availability in grassland soils modifies their microbial communities and de-creases the abundance of arbuscular mycorrhizal fungi[J].Soil Biology and Biogeochemistry,2006,38:1583-1595.
[12]
Hobbie S E,Vitousek P M.Nutrient limitation of decomposi-tion in Hawaiian forests[J].Ecology,2000,81:1867-1877.
[13]
Weintraub M N,Schimel J P.Nitrogen mineralization and soil organic matter chemistry in Arctic tundra soil[J].Ecosystem, 2003,6:129-143.
[14]
Aerts R,Van Logtestijn R S P,Karlsson P S.Nitrogen supply differentially affects litter decomposition rates[J].Oecologia, 2006,146:652-658.
[15]
Houghton J T,Ding Y,Griggs D J,et al.Climate change 2001: the scientific basis third IPCC report[C].Cambrige:Cam-bridge University Press,2001.
[16]
Mack M C,Schuur E A G,Bret-Harte M S,et al.Ecosystem car-bon storage in arctic tundra reduced by long-term nutrient fertil-ization[J].Nature,2004,431:440-443.
[17]
Allison S D,LeBauer D S,Ofrecie M R,et al.Low levels of ni-trogen addition stimulate decomposition by boreal forest fungi[J].Soil Biology and Biochemistry,2009,41:293-302.
[18]
Aerts R,Logtestijn R V,Staalduinen M V,et al.Nitrogen supply effects on productivity and potential leaf litter decay of Carex species from peatlands differing in nutrient limitation[J].Oeco-logia,1995,104:447-453.
Hobbie S E,Nadelhoffer K J,H?gberg P.A synthesis:the role of nutrients as constrains on carbon balances in boreal and arc-tic regions[J].Plant and Soil,2002,242:163-170.
[22]
Allison S D,Czimczik C L,Treseder K K.Microbial activity and soil respiration under nitrogen addition in Alaskan boreal forest[J].Global Change Biology,2008,14:1156-1168.
[23]
Mikan J C,Schimel J P,Doyle A P.Temperature controls of mi-crobial respiration in arctic tundra soils above and below freez-ing[J].Soil Biology and Biochemistry,2002,34,1785-1795.
[24]
Wang X W,Li X Z,Hu Y M,et al.Potential carbon mineraliza-tion of permafrost peatlands in Great Hing’an Mountains,Chi-na[J].Wetlands,2010,30:747-756.
Davidson E A,Janssens I A.Temperature sensitivity of soil car-bon decomposition and feedbacks to climate change[J].Na-ture,2006,440:165-173.
[27]
Hopkins D W,Sparrow A D,Elberling B,et al.Carbon,nitro-gen and temperature controls on microbial activity in soils from an Antarctic dry valley[J].Soil Biology and Biochemistry, 2006,38:3130-3140.