免耕春小麦套种牧草土壤养分动态研究

Dynamic change of soil nutrient in free tillage spring wheat-grass intercropping land

研究免耕春小麦Triticumaestivum套种牧草土壤养分的动态变化,分析了小麦套种白花草木樨Me-lilotus albus、野豌豆Vicia villosa、英吉沙豌豆Pisumsativum、玉米Zea mays、毛苕子V.villosa对土壤有机质、碱解氮和速效磷的影响。结果表明,套种牧草能提高土壤有机质、碱解氮和速效磷的含量,特别是套种白花草木樨和套种野豌豆增加更为明显,其中套种白花草木樨土壤碱解氮含量增加4.8 mg/kg,增幅19.4%,套种野豌豆土壤有机质增加0.39 g/kg,增幅1.6%,土壤速效磷含量增加了8 mg/kg,增幅23.9%;土壤有机质、碱解氮和速效磷含量随土层深度的增加而降低。

The experiment studied dynamic change of soil nutrient in free tillage spring wheat-grass intercropping land, and analyzed the effect of wheat-sweet clover, wheat-wild pea, wheat-pea, wheat-maize, wheat-hairy vetch intercropping on soil organic matter, alkali-soluble N and available P. The result showed that the treatments of wheat-grass intercropping increased soil organic matter, alkalisoluble N and available P. Wheat-sweet clover and wheat-wild pea intercropping increased alkali-soluble N 4.8 mg/kg（19. 4%） and soil organic matter 0.39 g/kg（1.6%） ,respectively. Wheat-wild pea intercropping also increased 8 mg/kg（23.9%） available P. The contents of soil organic matter, alkalisoluble N and available P reduced with the increasing soil depth.