摘要
运用对通州区的调查资料和试验结果,分析了不同典型种植模式对0—2 m土壤矿质氮累积量的影响。结果表明,不同种植模式对0—2 m土壤矿质氮提取利用能力顺序为:向日葵—向日葵>冬小麦—夏玉米(玉米秸秆还田)>冬小麦—夏玉米(玉米秸秆不还田)>冬小麦—大豆>玉米—玉米。在大田作物生产中,应进行合理的作物轮作、增加地面覆盖度、轮作中加入有固氮能力的豆科作物、注重与根系发达或深根作物进行轮作,能有效地提取利用土壤深层NO3--N,并能有效减少氮素向土壤下层的淋洗。蔬菜生产田0—2 m土壤含有较高的NO3--N和NH4+-N,累积量达1935.03 kg/hm2和201.8 kg/hm2,因此,应通过减少氮肥投入量,优化轮作种植模式以提高作物对深层土壤NO3--N的回收利用。
The effects of different cropping systems on soil inorganic nitrogen accumulation was analyzed using survey and experiments date. The results showed that the ability to recover nitrogen fertilizer under different cropping systems was as follows： continuous sunflower 〉 wheat-corn rotation （field covered with crops） 〉 wheat-corn rotation （without covering） 〉 wheat-soybean rotation 〉 continuous corn. Reasonable rotation （i. e. rotation with N2-fixing legumes, rotation with deep-rooted crops） and stubble-mulch, were recommended because they could utilize NOr-N from the subsoil, prevent losses of nutrients from leaching. The amount of NO3^- -N accumulation and NH4^＋ -N accumulation in vegetable field in 0-2 m soil layer was 1935.03 kg/ha and 201.8 kg/ha respectively. The high concentration of residue NOf -N indicated that the rate of N input should be reduced, and cropping sequence should be adopted to enhance the utilization efficiency of NOf -N from the soil at depths below the rooting zone.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2009年第6期1260-1265,共6页
Journal of Plant Nutrition and Fertilizers
基金
国家科技支撑计划(2006BAD17B09)资助
关键词
种植模式
蔬菜田
大田
硝态氮
铵态氮
cropping systems
vegetable field
crop field
nitrate-N
ammoniumN
