聚天冬氨酸尿素对土壤微生物量碳、氮的影响  

Effects of polyaspartic urea(PASP-Urea) on soil microbial biomass carbon and nitrogen under incubation and pot experiment

作　　者：谢方淼[1,2] 李东坡[3] 李健强[1] 蔡典雄[4] 

机构地区：[1]中国农业大学农学与生物技术学院,北京100094 [2]北京海亚地大生化科技有限公司,北京100101 [3]中国科学院沈阳应用生态研究所,辽宁沈阳110016 [4]中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《中国土壤与肥料》2011年第4期8-12,共5页Soil and Fertilizer Sciences in China

基　　金：国家重点基础研究发展计划项目(编号:2007CB109305);国家"863"计划项目(编号:2006AA100220;2006AA100206);江苏省科技支撑计划(BE2008351)

摘　　要：土壤微生物量碳、氮是植物营养与土壤肥力的主要参数之一。采用对聚天冬氨酸、普通尿素及聚天冬氨酸尿素肥料培养实验、小麦盆栽方法,研究了普通尿素及聚天冬氨酸尿素对土壤微生物量碳、氮的影响。培养试验结果表明:聚天冬氨酸在培养早期能促进土壤微生物量碳、氮增加,聚天冬氨酸尿素处理比普通尿素处理对土壤微生物量碳、氮的作用更有效,前45 d,普通尿素处理的土壤微生物量氮降幅达21.87 mg.kg-1,而聚天冬氨酸尿素处理的土壤微生物量氮仅降低4.8 mg.kg-1;盆栽条件下,三叶期聚天冬氨酸尿素处理比普通尿素处理的土壤微生物量氮差值最高达12.57 mg.kg-1,成熟期差值为2.85 mg.kg-1,抽穗期、成熟期的聚天冬氨酸尿素处理比普通尿素处理土壤微生物量碳分别低16.12和14.81 mg.kg-1。说明聚天冬氨酸尿素的碱解氮易被聚天冬氨酸吸附,养分持效时间更长,比尿素具有一定增效作用。It is one of important parameters that soil microbial biomass carbon and nitrogen（SMB-C and SMB-N） in plant nutrition and soil fertility.The experiment under incubation and pot experiment with spring wheat were conducted to evaluate SMB-C and SMB-N respectively under the treatments of polyaspartic acid（PASP）,urea（U） and polyaspartic urea（PASPU）.The incubation results showed that PASP could enhance the amount of SMB-C and SMB-N at the early stage during incubation period.Comparing with urea treatment,PASPU significantly increased the amount of SMB-C and SMB-N.Incubation results at period of first 45 days showed that the SMB-N under U treatment decreased the amount of N 21.87 mg·kg-1 soil and the SMB-N under PASPU treatment only N 4.8 mg·kg-1 soil.The SMB-N under PASPU treatment from pot experiment was N 12.57 mg·kg-1 soil lower than the one of U treatment at the trefoil stage of spring wheat and N 2.85 mg·kg-1 soil higher at the maturity.The amount of SMB-C under PASPU treatment was C 16.12 mg·kg-1 soil and C 14.81 mg·kg-1 soil lower respectively at the heading and maturity stage than the one under U treatment.It means that PASPU could have more efficient nitrogen than urea to be used during the period of crop growth since N nutrient released from PASPU last longer than ones from the urea due to PASP capture more available nitrogen from PASPU.

关 键 词：聚天冬氨酸尿素 土壤微生物量碳氮 碳氮效应 

分 类 号：S143.14[农业科学—肥料学] S154.33[农业科学—农业基础科学]