雷竹高效栽培措施对土壤碳库的影响

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1、维普资讯http://www.cqvip.com第38卷第6期林业科学Vo1．38，No．62002年11月SCIENTIASILVAESINICAENOV．，2002雷竹高效栽培措施对土壤碳库的影响姜培坤周国模徐秋芳(浙江林学院临安311300)摘要：采样分析了高效栽培雷竹林土壤不同形态碳含量。结果表明：竹林土壤有机碳总量(c)接近天然马尾松林，明显高于相邻板栗林地。雷竹土壤微生物生物量碳(c)出现了明显下降的趋势，分别比马尾松和板栗林降低了23．12％和12．63％，连年施用化肥竹林c和c／c下降辐度更大，近3a单用化肥

2、竹园土壤c和c／c比有机无机肥混施竹园降低了61．54％和58．82％，但随着覆盖年份增加，土壤c和c／c有上升的趋势。雷竹园土壤活性碳含量(c)以及c／c保持与天然马尾松林相同水平，近3a有机无机肥混施地块土壤c和c／c是单施化肥地块的1．39和1．23倍，随着覆盖年份增加土壤c也明显增加，但稳定态碳(C)没有明显的变化规律。雷竹园冬季覆盖物补充了土壤水溶性有机碳(c)的库源，使土壤c上升，覆盖年份从1a到5a，土壤c增加了1倍，土壤c／c也增加了0．75倍。雷竹土壤c与c、c之间，c与c之间以及c、c、c与土壤全氮、水解

3、氮、有效磷、速效钾之间相关性均达极显著水平(P<0．O1)；而土壤c与c、c、c、全氮、水解氮、有效磷、速效钾之间相关性均不显著。关键词：雷竹，土壤有机碳总量，土壤微生物量碳，土壤活性碳，土壤水溶性有机碳，稳定态碳EFFECToFD汀ENSI、厂】CULTⅣATIoNoNTHECARBoNPooL0lFSoILDPHYLLoSTACHYSPRAECoxSJiangPeikunZhouGuomoXuQiufang(ZhejiangForestryCollegeLin’an311300)Abstract：Differentfra

4、ctionsofsoilCweredetectedinPhyllostachyspraecoxstands．Itwasfoundthatthetotalsoilor-ganicC(CT)WasalmostthesameasthatofP／nusmassoniananaturalstands，buthi【gherthanthatofCasmeamollissimastandswhichisadjacenttoPhyllostachyspraecoxstands．SoilmicrobialbiomassC(CMB)decreas

5、edby23．12％(com—paredtoP／nus?llx~$oniana)and12．63％(comparedtoCasmeamoUissima)．CMBandCMB／CTdeclinedmoreapparentlyincontinuouschemicalfertilizerapplicationstands．CMBandCMB／CTdecreasedby61．54％and58．82％respectivelyin3-yearchemicalfertilizerapplicationstandcomparedtothes

6、tandswithmixedapplicationofchemicalandorganicfertilizer．Continuousmulchingwithorganicmaterialinwinter，however，wasdetectedanincreaseinCMBandCMB／CT．SoilactiveC(CA)measuredby333mmol‘L一KMnO4andCA／CTsustainedthesamelevelwithP／nus?llx~$oniana．CAandCA／CTwererespective1．39

7、and1．23timesoverin3-yearcombiningapplicationofchemicalandorganicfertilizerrelativetomo·notonouschemicalfertilizerapplicationandCAwasincreasingwiththemulchingyears．MulchingmaterialinwinterWasal—soobservedtoresultagrowinginwater-solubleC(CWs)，onetimesofincreaseinCWsW

8、asmeasuredfrom1一yearto5一yearmulchingstandsandcorrespondingCws／CTincreased0．75folds，butunactiveC(CuA)Wasobservednoincrease．Signif-icantrelationshi