长期施用有机肥对瘠薄红壤有效碳库及碳库管理指数的影响

主要分析了长期施用有机肥对瘠薄红壤有效碳库(微生物量碳,易氧化碳,矿化碳)及碳库管理指数(CPMI)的影响.结果表明:长期施用有机肥对土壤有效碳库和碳素有效率有很大影响,绿肥,稻草秸秆肥和厩肥处理的土壤有机碳,微生物量碳、易氧化碳、矿化碳的数量、碳素有效率明显高于对照处理的土壤。施肥对全碳、矿化碳的影响为:厩肥>绿肥>秸秆稻草肥>本田还田>对照,对微生物量碳的影响为:绿肥>厩肥>稻草秸秆肥>本田还田>对照,对活性碳(CA)、CPMI,碳素有效率A、B、C的影响为:绿肥>稻草秸秆肥>厩肥>本田还田>对照。在提高CA、CPMI方面,绿肥和稻草秸秆肥优于厩肥。相关分析表明:土壤有效碳库和碳素有效率与土壤化学性质相关或极相关,CPMI与土壤养分因子相关或极相关,反映了农业生产措施对土壤碳库的影响,可以运用CPMI来评估土壤碳库的变化。

Effects of Long-term Application of Organic Manure on Available Carbon Pool and Carbon Pool Management Indexes in Infertile Red Soils

The effects of long-term application of organic manure on soil av ailable carbon pool(microbial biomass carbon, easily oxidized carbon and mineral izable carbon) and carbon pool management indexes in infertile red soils were di scussed in the paper.The results indicated that long-term application of organic manure had great effects on soil available carbon pool and available ratio of s oil carbon.Green manure treatment,farmyard manure treatment and rice straw trea tment had greater effects on soil organic carbon ,microbial bilmass carbon,eas ily oxidized carbon ,mineralizable carbon and available ratio of soil carbon th an CK treatment. Effects of different treatments on C_(MB) and C_T ,C_M wer e green manure>farmyard manure>rice straw>straw returned to farm>CK and farmyard manure> green manure >rice straw>straw returned to farm>CK respectively. Effect s of different treatments on C_A,A_(AC),A_(BC),A_(CC),CPMI were gree n manure >rice straw> farmyard manure> straw returned to farm>CK.In raising C_A ,CPMI ,effects of different organic fertilizer types and application were gree n manure and rice staw better than farmyard manure . Correlation analysis showe d: there were significant or extremely significant relationships between availab le ratio of soil carbon ,microbial biomass carbon, easily oxidized carbon ,miner alizable carbon and chemical properties of soil,CPMI was closely related to tota l C,total N, microbial biomass C and N, available N,P and K in those soils and s entive to agricultural measures,which indicated that it was practical to assess soil C pools under different management practices using CPMI.