摘要
通过起垄和施肥试验,研究不同措施对冷浸田土壤氧化还原状况的影响,以期为冷浸田改良提供数据参考。结果表明,冷浸田土壤氧化还原电位介于48.5~198.0 mV之间,远低于正常稻田（450~700 mV）。起垄使0~5 cm土层氧化还原电位有升高趋势,但使〉5 cm土层土壤氧化还原电位降低。冷浸田还原性物质总量变化范围为5.7~15.6 cmol.kg 1（起垄试验）和7.7~16.0 cmol.kg 1（施肥试验）,起垄在短期内会提高土壤还原性物质总量,增施钾肥、锌肥和硅肥会降低土壤还原性物质总量,而磷肥用量对土壤还原性物质基本无影响。0~25cm和25~50 cm土层土壤Fe2＋含量平均为3 388.92 mg.kg 1和3 356.39 mg.kg 1;起垄60 d后,土壤Fe2＋含量随着起垄高度增加而逐渐降低;与不施肥（CK）、氮磷钾（NPK）处理相比,施钾量增加20%（NPK2）、增加硅肥（NPK＋Si）和增加锌肥（NPK＋Zn）可以大幅度降低土壤Fe2＋含量;0~25 cm土层土壤Fe2＋含量高于25~50 cm土层。起垄和施肥使冷浸田土壤Mn2＋含量先降低后升高。
oil redox was one of the most important chemical process in cool waterlogged paddy fields that occurred in the entire process of soil development.It importantly influenced the migration and transformation of soil materials and determined biological effectiveness of soil nutrients and contaminants.Soil redox research was still largely lacking in cold waterlogged paddy fields.The effects of ridging and fertilization on the state of soil redox in cold waterlogged paddy fields were analyzed in this study to lay relevant references for improving cold waterlogged paddy soils.An experiment of four ridge treatments [control（CK）,ridge height of 10 cm（LG 10）,15 cm（LG 15）,and 20 cm（LG 20）] and eight fertilization treatments [CK（without fertilization）,NPK（N 180 kg.hm^-2,P 2 O 5 90 kg.hm^-2 and K 2 O 120 kg.hm^-2）,NP 1 K（N 180 kg.hm^-2,P 2 O 5 72 kg.hm^-2 and K 2 O 120 kg.hm^-2）,NP 2 K（N 180 kg.hm^-2,P 2 O 5 108 kg.hm^-2 and K 2 O 120 kg.hm^-2）,NPK＋Zn（N 180 kg.hm^-2,P 2 O 5 90 kg.hm^-2,K 2 O 120 kg.hm^-2 and Zn 0.75 kg.hm^-2）,NPK 1（N 180 kg.hm^-2,P 2 O 5 90 kg.hm^-2 and K 2 O 96 kg.hm^-2）,NPK 2（N 180 kg.hm^-2,P 2 O 5 72 kg.hm^-2 and K 2 O 144 kg.hm^-2）,NPK＋Si（N 180 kg.hm^-2,P 2 O 5 90 kg.hm^-2,K 2 O 120 kg.hm^-2 and SiO 2 0.75 kg.hm^-2）] was conducted to study soil redox in cold waterlogged paddy fields.Results showed that soil redox potential was 48.5- 198.0 mV in cold waterlogged paddy fields,which was far lower than that（450-700 mV） in normal paddy fields.Ridging increased soil redox potential in the top（0-5 cm） soil layer while suppressing it in the lower（5-20 cm） soil layer.Total reductions in cold waterlogged paddy soils were 5.7-15.6 cmol.kg 1 under ridge treatments and 7.7-16.0 cmol.kg 1 under fertilizer treatments.Ridging increased total reduction over the short-term.While applications of potassic,zinc-and silicon fertilizer retarded total reduction,application of phosphate had no effects on total reduction.Average soil Fe^2＋ content was 3 388.92 mg.kg 1 in the 0-25 cm soil layer and 3 356.39 mg.kg 1 in the 25-50 cm soil layer.About 60 days after ridging,soil Fe^2＋ content decreased with increasing ridge height.NPK 2,NPK＋Si and NPK＋Zn treatments sharply decreased soil Fe^2＋ content compared with CK and NPK.Ridging and fertilization initially decreased soil Mn 2＋ content and then increased it in cold waterlogged paddy fields.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2013年第6期666-673,共8页
Chinese Journal of Eco-Agriculture
基金
国家公益性行业(农业)科研专项(201003059)
国家科技支撑计划项目(2012BAD05B05)
湖北省农业科技创新中心项目(2007-620-001-03)资助
关键词
起垄
施肥
冷浸田
土壤氧化还原状况
氧化还原电位
Ridging
Fertilization
Cold waterlogged paddy field
Soil redox potential
Redox potential
