?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Forgprints.org%2Fid%2Feprint%2F3175%2F&rft.title=Gross+sulphur+mineralisation-immobilisation+turnover+in+soil+amended+with+plant+residues&rft.creator=Eriksen%2C+J.&rft.subject=+Nutrient+turnover&rft.description=The+rates+of+sulphur+(S)+released+to+and+removed+from+the+soil+inorganic+pool+were+estimated+using+the+isotopic+dilution+technique.+In+an+initial+study+fresh+soil+was+mixed+with+combinations+of+two+inorganic+S+levels+(0+and+10+%C2%B5g+S+g-1+soil)+and+three+plant+residues+(wheat+straw%2C+perennial+ryegrass+and+oilseed+rape)+and+followed+over+32+days+of+incubation.+As+35S+recovery+was+inadequate+prior+to+day+2+and+re-mineralisation+of+immobilised+35S+occurred+after+day+8+thereby+invalidating+the+method%2C+estimates+of+gross+S+transformation+rates+should+be+based+on+data+sampled+between+days+2+and+8.+In+the+main+experiment+16+plant+residues+with+ranges+in+S+contents+of+0.08-0.81%25%2C+C%2FS+ratios+of+50-604+and+lignin+content+of+0.9-10.8+were+mixed+with+soil+and+carrier-free+35S+label.+Net+turnover+rates+varied+from+58%25+of+S+in+Persian+clover+being+immobilised+to+76%25+of+S+in+winter+cress+being+mineralised+within+five+days+of+incubation.+Gross+S+mineralisation+varied+from+0.9-14.9+%C2%B5g+S+g-1+soil+d-1+whereas+gross+immobilisation+only+varied+from+0.5+to+3.1+%C2%B5g+S+g-1+d-1.+Gross+S+immobilisation+was+strongly+correlated+to+the+C%2FS+ratio+of+the+plant+material+(P%3C0.001)+whereas+gross+S+mineralisation+showed+a+weaker%2C+but+still+significant%2C+correlation+with+lignin+content+(P%3C0.05).+The+results+indicate+that+immobilisation+may+predominantly+have+been+a+biological+process+in+response+to+carbon+addition+while+early+mineralisation+may+have+been+dominated+by+the+biochemical+hydrolysis+of+organic+sulphates+in+the+residues.+If+attention+is+paid+to+the+various+constraints+and+limitations%2C+isotopic+pool+dilution+using+35S+offers+a+tool+that+may+prove+valuable+in+understanding+and+modelling+soil+S+turnover.&rft.date=2004&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=%2Fid%2Feprint%2F3175%2F1%2F3175.pdf&rft.identifier=+++Eriksen%2C+J.+++(2004)+Gross+sulphur+mineralisation-immobilisation+turnover+in+soil+amended+with+plant+residues.+++Soil+Biology+%26+Biochemistry%2C+37%2C+pp.+2216-2224.++++++++