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《@干湿交替对东北温带次生林与落叶松人工林土壤有机碳矿化的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第24卷第5期水土保持学报Vol.24No.52010年10月JournalofSoilandWaterConservationOct.,2010干湿交替对东北温带次生林与落叶松人工林*土壤有机碳矿化的影响刘云凯,张彦东,孙海龙(东北林业大学林学院,哈尔滨150040)摘要:在中温带的黑龙江省帽儿山地区,采集次生林和落叶松人工林表层(0-10cm)土壤,进行室内有机碳矿化培养。先在不同温度(5,15,25,35℃)下干土培养3d,然后进行不同水平的增湿处理(土壤含水率为25%,50%,75%,100%)继续培养11d。结果表明:加水增湿后两林分土壤有机碳矿化速率均被激发
2、并在短时间(1~4d)内达到最大值,不同处理次生林土壤有机碳矿化速率最大值变化范围为15.94~212.65μgCO2-C/(g·d),落叶松人工林土壤为16.75~110.85μgCO2-C/(g·d)。两林分土壤有机碳矿化速率和矿化量随处理湿度的增加而增大,但落叶松人工林100%湿度处理在培养温度超过5℃时,土壤有机碳矿化速率和矿化量却低于75%湿度处理。高温(≥25℃)和高湿(50%~100%)条件下次生林土壤有机碳矿化的激发效应明显大于落叶松人工林土壤,而且次生林土壤有机碳矿化的湿度敏感性系数(k)和温度敏感性系数(Q10)均大于落叶松人工林土壤。这表明随着温度
3、的升高,干湿交替可导致次生林土壤较落叶松人工林土壤损失更多的碳。关键词:干湿交替;有机碳矿化;土壤温度;土壤湿度中图分类号:S153.6文献标识码:A文章编号:1009-2242(2010)05-0213-05EffectsofRewettingonSoilOrganicCarbonMineralizationinTemperateSecondaryForestandLarixolgensisPlantationofNortheastChinaLIUYun-kai,ZHANGYan-dong,SUNHai-long(SchoolofForestry,NortheastF
4、orestryUniversity,Harbin150040)Abstract:Withincubationtest,thispaperstudiedtheresponsesofmineralizationrateandcumulativemineralizeda-mountofsurfacesoil(0-10cm)organiccarbontotemperature(5,15,25,35℃)andsoilrewettingwithdifferentmoisture(watercontent:25%,50%,75%,100%)fromsecondaryforestand
5、LarixolgensisplantationinMaoers-hanmountainofHeilongjiangprovince.Theresultsshowedthatsoilorganiccarbonmineralization(SOCM)ratesex-citedrapidlyandreachedthemaximuminfewdays(1~4d)followingrewettingtreatment.ThehighestSOCMateschangedfrom15.94μgCO2-C/(g·d)to212.65μgCO2-C/(g·d)insecondaryfor
6、est,andfrom16.75μgCO2-C/(g·d)to110.85μgCO2-C/(g·d)inLarixolgensisplantation.Withtheincreaseofwateraddition,SOCMratesincreased,bothofsecondaryforestandLarixolgensisplantation.Butwhentemperatureexceeded5℃,SOCMratesof100%watertreatmentwerelessthan75%watertreatmentinLarixolgensisplantation.A
7、thightemperature(≥25℃)andbigmoisture(50%to100%)conditions,theratesofSOCMincreasedinsecondaryforestweresignificantlylargerthanLarixolgensisplantation.Inaddi-tion,moisturesensitivitycoefficients(k)andtemperaturesensitivitycoefficients(Q10)ofSOCMinseconda-ryforestweregreater
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