短期耕作对紫色水稻土有机碳矿化及氧化稳定性的影响  

Short-term Effects of Tillage on Mineralization and Oxidization Stability of Organic Carbon in Purple Paddy Soil

作　　者：符卓旺[1,2] 杨静[1,2] 彭娟[1,2] 朱洁[1,2] 慈恩[1,2] 高明[1,2] 谢德体[1,2] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]重庆市三峡库区农业面源污染控制工程技术研究中心,重庆400716

出　　处：《农机化研究》2012年第11期141-145,共5页Journal of Agricultural Mechanization Research

基　　金：重庆市自然科学基金项目(CSTC;2009BB1108);中国科学院战略性先导科技专项(XDA05050506);水体污染控制与治理科技重大专项(2012ZX07104-003);中国博士后科学基金项目(20090460716;201003306)

摘　　要：以长期定位试验点紫色水稻土为研究对象,研究了短期耕作对紫色水稻土有机碳矿化特征及氧化稳定性的影响。结果表明:短期内经一季水稻种植后,不同耕作制度0～20cm耕层土壤有机碳含量均有所升高。垄作免耕(中稻)和垄作免耕(稻油)在水稻收获后土壤有机碳含量均显著高于常规平作(中稻),而水旱轮作(稻油)显著低于常规平作(中稻),表明长期垄作免耕会导致有机碳聚集于土壤表层。除水旱轮作(稻油)外,其他耕作处理在水稻收获后土壤易氧化性有机质含量均显著下降,且土壤易氧化有机碳含量大小顺序均为垄作免耕(中稻)>常规平作(中稻)>垄作免耕(稻油)>水旱轮作(稻油),还有垄作免耕(稻油)在水稻收获后土壤易氧化有机碳占有机碳的比例最低,表明实行稻油轮作的模式可以增加土壤难氧化有机碳含量。Effects of different tillage systems on Soil Organic Carbon Mineralization and its Relationship with Labile Or- ganic Carbon in Paddy Soils on Rice Growth of long term experiment site （ carbon was determined by 333 mmol/L KMnO4. The results showed that all since 1990） were studied. Soil labile organic tillage systems can increase organic carbon in soil layer 0-15 cm after rice harvesting. No-tillage and ridge with rice-rape rotation （NR-rr） and no-tillage and ridge with rice only （NR-r） were significantly higher than conventional tillage with rice only （ CT-r）, while conventional till- age with rice-rape rotation （CT-rr） was lower than CT-r. These indicated that long-term NR-rr or NR-r may lead to enrichment of soil organic carbon （ SOC ） in the surface soil layer. Soil liable organic carbon （ LOC ） concentration was decreased after rice harvesting in all treatments excepted CT-r and LOC content in the 0-15 cm soil layer under different tillage system were in an order： NR-r 〉 CT-r 〉 NR-rr 〉 CT-rr. These showed that pattern of rice-rape rotation may decrease the content of LOC. Cumulative mineralization amount and mineralization intensity of SOC were significantly （ p 〈 0. 05） different between all treatments.

关 键 词：耕作制度 水稻土 有机碳矿化 易氧化有机碳 

分 类 号：S153[农业科学—土壤学]