摘要
基于长期田间定位试验样地,研究了裸地(CK1)、不施肥秸秆移除(CK2)、不施肥秸秆还田(CK3)、施无机肥秸秆移除(NPK)、有机无机肥混施秸秆移除(1/2NPK+1/2OM)、有机肥秸秆移除(OM)、无机肥秸秆还田(NPK+S)、有机肥秸秆还田(OM+S)8种处理对土壤有机质及其组分含量的影响。结果表明,CK1土壤有机质及有机质各组分含量最低,但有机质稳定性较CK2、CK3高。与CK2相比,施肥处理(NPK、1/2NPK+1/2OM、OM)、秸秆还田处理(CK3)以及秸秆与肥料混施处理(NPK+S、OM+S)均能不同程度地增加土壤有机质及其各组分的含量,提高土壤有机质稳定性。其中OM处理效果最为显著,有机质含量比CK2高155.1%;有机质各组分中可溶性有机质DOM、富里酸FA、胡敏酸HA、胡敏素HM比CK2分别高39.1%、133.7%、540.0%、152.5%;HA/FA值为0.43,比CK2高173.9%。在CK3的基础上施用肥料(NPK+S、OM+S),土壤有机质含量以及有机质稳定性均有所增加,并且有机肥(OM+S)效果好于无机肥(NPK+S)。可见秸秆还田及有机肥施用对潮土有机质及其各组分含量均有提升作用,促进有机质积累并提高其稳定性。
Field experiments were conducted to study the effects of different fertilization and straw returning on soil organic matter and its components. Eight treatments were designed including the bare land （CK1）, crops grown without fertilizer application and straw returning （CK2）, straw returning without fertilizer application （CK3）, inorganic fertilizer application without straw returning （NPK）, coupled with straw removing and fertilizer application mixed with organic and inorganic （1/2NPK＋1/2OM）, organic fertilizer application without straw returning （OM）, inorganic fertilizer application with straw returning （NPK＋S）, organic fertilizer application with straw returning （OM＋S）. The results showed that soil organic matter and organic matter component contents of CK1 were the lowest, but soil organic matter in CK1 was more stable than that in the CK2 and CK3. Compared with CK2, fertilization application （NPK, 1/2 NPK＋1/2OM, OM） and CK3, and fertilizers application with straw returning （NPK＋S, OM＋S） increased soil organic matter content and improved its stability. When compared with CK2, soil organic matter in organic fertilizer application （OM） reached maxim and increased by 155.1%. Moreover, the content of dissolved organic matter, fulvic acid, humic acid and humin increased by 39.1%, 133.7%, 540.0% and 152.5%, respectively. The HA/FA ratio was 0.43 in OM treatment and increased by 173.9% compared with CK2. Both the content of soil organic matter and its stability increased in NPK＋S and OM＋S on the basis of CK3 while the latter increased more than the former. In conclusion, straw returning and organic fertilizer application are important in improving the content and stabilization of soil organic matter in the fluvo-aquic soil.
出处
《土壤》
CAS
CSCD
北大核心
2015年第6期1034-1039,共6页
Soils
基金
中国科学院战略性先导科技专项课题项目(XDA0505050203
XDB15030302)
中国科学院科技服务网络计划项目(KFJ-EW-STS-055-4)
中国科学院知识创新工程项目(ISSASIP1118)
国家自然科学基金委员会面上基金项目(41471182)
江苏高校优势学科建设工程项目资助
关键词
定位施肥
秸秆还田
潮土
土壤有机质
有机质组分
Locating fertilization
Straw returning
Fluvo-aquic soil
Soil organic matter
Organic components
