?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=CN-SIM+-+a+model+for+the+turnover+of+soil+organic+matter.+I%3A+Long+term+carbon+development&rft.creator=Petersen%2C+B.M.&rft.creator=Berntsen%2C+J.&rft.creator=Hansen%2C+S.&rft.creator=Jensen%2C+L.S.&rft.subject=+Nutrient+turnover&rft.description=A+computer+model+is+presented+that+describes+the+flow+of+C+and+N+in+the+soil.+It+employs+a+structure+with+conceptual+compartments.+Organic+matter+is+represented+by+seven+different+compartments%2C+two+for+added+matter%2C+two+for+soil+microbial+biomass%2C+one+for+microbial+residues%2C+one+for+native+organic+matter%2C+and+one+for+inert+organic+matter.+The+latter+pool+probably+represents+both+truly+inert+matter%2C+and+matter+with+a+very+slow+turnover.+This+paper+describes+the+parameterisation+and+performance+of+this+model+on+selected+long-term+field+data+from+United+Kingdom%2C+Sweden+and+Denmark.+Statistical+methods+were+employed+to+optimise+parameters%2C+and+obtain+proximate+confidence+intervals+for+these+parameters.+Very+satisfactory+simulations+could+be+acquired%2C+using+the+same+set+of+parameters+on+all+sites.+It+was+demonstrated+that+the+inert+(refractory)+pool+may+constitute+any+amount+between+approx.+10%25+and+50%25+of+total+SOC%2C+so+that+modelling+can+not+be+used+as+a+tool+to+give+narrow+estimates+for+this+pool.&rft.date=2005&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F87%2F1%2F87.pdf&rft.identifier=Petersen%2C+B.M.%3B+Berntsen%2C+J.%3B+Hansen%2C+S.+and+Jensen%2C+L.S.+(2005)+CN-SIM+-+a+model+for+the+turnover+of+soil+organic+matter.+I%3A+Long+term+carbon+development.+Soil+Biology+and+Biochemistry+(37)%2C+pp.+359-374.&rft.relation=http%3A%2F%2Forgprints.org%2F87%2F