摘要
选取四川紫色土作为实验土壤,采用紫马铃薯与紫薯轮作制度,探究减肥条件下配施不同有机物对土壤有机碳活性组分的影响。共设置不施肥(CK)、常规化肥(CF)、常规化肥配施秸秆(CFS)、减量50%化肥配施微生物有机肥(RFM)、减量50%化肥配施蚯蚓生物复合有机肥(RFV)、减量50%化肥配施秸秆和微生物有机肥(RFSM)、减量50%化肥配施秸秆和蚯蚓生物复合有机肥(RFSV)7个施肥处理。结果表明:有机物料的施用对土壤总有机碳的影响并不显著,但显著增加微生物量有机碳(MBC)和轻组分有机碳(LOC)含量,增幅为10.6%~42.6%,对土壤可溶性有机碳(DOC)和颗粒有机碳(POC)含量影响不显著,但对DOC组分结构产生了影响;DOC的三维荧光分析结果表明:类胡敏酸和类富里酸物质是紫色土DOC的主要组成部分,且RFSM和RFSV处理中类胡敏酸和类富里酸物质增多,类色氨酸、类酪氨酸和类溶解性微生物代谢物下降,同时三维荧光指数上升,说明DOC主要来源于微生物的代谢活动。总之,化肥减施下配施有机肥可以增加MBC和LOC含量,改变DOC的组分结构。
We explored the effects of different organic compounds on soil organic carbon active components under the condition of reduced fertilizer application in purple soil in Sichuan,under purple potato and Solanum tuberdsm rotation system.There were seven treatments,including no fertilization(CK),conventional fertilizer(CF),conventional fertilizer with straw(CFS),reduced 50%fertilizer with microbial organic fertilizer(RFM),reduced 50%fertilizer with earthworm biological compound organic fertilizer(RFV),reduced 50%fertilizer with straw and microbial organic fertilizer(RFSM),reduced 50%fertilizer with straw and earthworm biological compound fertilizer(RFSV).The results showed that the application of organic materials did not affect soil total organic carbon content,but significantly increased microbial biomass carbon(MBC)and the content of labile organic carbon(LOC)by 10.6%-42.6%.The results of threedimensional fluorescence analysis of soil dissolved organic carbon(DOC)showed that humic acid and furitic acid were the main components of DOC in purple soil.Under the treatments of RFSM and RFSV,the contents of humic acid and furitic acid increased,while tryptophan,tyrosine and soluble microbial metabolites decreased.The three-dimensional fluorescence index increased,indicating that DOC was mainly derived from the metabolic activities of microorganisms.In conclusion,organic fertilizer addition under reduced chemical fertilizer application could increase MBC and LOC content and change the component structure of DOC.
作者
孔德宁
康国栋
李鹏
沈学善
刘满强
李辉信
胡锋
焦加国
KONG De-ning;KANG Guo-dong;LI Peng;SHEN Xue-shan;LIU Man-qiang;LI Hui-xin;HUFeng;JIAO Jia-guo(College of Resources and Environmental Sciences,Nanjing Agricultural University/Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization,Nanjing 210095,China;Soil and Fertilizer Institute,Sichuan Academy of Agricultural Sciences,Chengdu 610066,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2021年第4期1073-1080,共8页
Chinese Journal of Ecology
基金
中央高校基本业务费(KYZ201815)
山东省重点研发计划(2019JZZY020614)
国家重点研发计划课题(2016YFD0200106)资助。
关键词
有机肥
有机碳
活性组分
三维荧光
organic fertilizer
organic carbon
active component
three-dimensional fluorescence
