Winter climate change has great potential to affect the functioning of terrestrial ecosystems.In particular,increased soil frost associated with reduced insulating snow cover may impact the soil nitrogen(N)dynamics in cold ecosystems,but little is known about the variability of these effects among the soil aggregates.A snow manipulation experiment was conducted to investigate the effects of snow absence on N cycling within soil aggregates in a spruce forest on the eastern Tibetan Plateau of China.The extractable soil available N(ammonium and nitrate),net N mineralization rate,and N cycling-related enzyme activities(urease,nitrate reductase,and nitrite reductase)were measured in large macroaggregate(＞2 mm),small macroaggregate(0.25-2 mm),and microaggregate(＜0.25 mm)during the early thawing period in the years of 2016 and 2017.Snow absence increased soil N availabilities and nitrite reductase activity in microaggregate,but did not affect net N mineralization rate,urease or nitrate reductase activities in any of the aggregate fractions.Regardless of snow manipulations,both soil inorganic N and nitrate reductase were higher in small macroaggregate than in the other two fractions.The effect of aggregate size and sampling year was significant on soil mineral N,net N mineralization rate,and nitrite reductase activity.Our results indicated that snow cover change exerts the largest impact on soil N cycling within microaggregate,and its effect is dependent on winter conditions(e.g.,snow cover and temperature).Such findings have important implications for soil N cycling in snow-covered subalpine forests experiencing pronounced winter climate change.

Zhijie Li;Rüdiger Reichel;Zimin Li;Kaijun Yang;Li Zhang;Bo Tan;Rui Yin;Kerui Zhao;Zhenfeng Xu

Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River&Institute of Ecology and Forestry,Sichuan Agricultural University,Chengdu 611130,China;Forschungszentrum Jülich GmbH,Institute of Bio-and Geosciences,Agrosphere(IBG-3),52425 Jülich,Germany;Université catholique de Louvain(UCLouvain),Earth and Life Institute,Soil Science,Louvain-La-Neuve 1348,Belgium;Global Ecology Unit CREAF-CSIC-UAB,CSIC,Barcelona,Catalonia,Spain;German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig,Deutscher Platz 5e,04103 Leipzig,Germany

土壤生态学快报（英文）

[1]Zhijie Li;Rüdiger Reichel;Zimin Li;Kaijun Yang;Li Zhang;Bo Tan;Rui Yin;Kerui Zhao;Zhenfeng Xu-.Effects of snow absence on available N pools and enzyme activities within soil aggregates in a spruce forest on the eastern Tibetan Plateau)[J].土壤生态学快报（英文）,2022(04):376-382

macroaggregate,microaggregate

Effects,snow,absence,available,pools,enzyme,activities,within,soil,aggregates,spruce,eastern,Tibetan,Plateau,Winter,climate,change,has,great,potential,affect,functioning,terrestrial,ecosystems,In,particular,increased,frost,associated,reduced,insulating,may,impact,nitrogen,dynamics,cold,but,little,is,known,about,variability,these,effects,among,experiment,was,conducted,investigate,cycling,China,extractable,ammonium,nitrate,net,mineralization,related,urease,reductase,nitrite,were,measured,small,during,early,thawing,period,years,Snow,availabilities,activity,did,not,any,fractions,Regardless,manipulations,both,inorganic,higher,than,other,two,size,sampling,significant,Our,results,indicated,that,exerts,largest,its,dependent,winter,conditions,temperature,Such,findings,have,important,implications,covered,subalpine,forests,experiencing,pronounced

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