播种方式对紫花苜蓿＋无芒雀麦人工草地土壤剖面养分分布的影响

采用田间调查取样和室内分析相结合的方法,2007年在内蒙古民族大学农学院试验农场以2年生单播紫花苜蓿、单播无芒雀麦、隔行混播和同行混播人工草地为研究对象,采用分层取样法研究了不同播种方式对土壤理化性质的影响,结果表明：在牧草生长期间单播无芒雀麦草地土壤容重最小,紫花苜蓿草地土壤容重最大;单播无芒雀麦、隔行混播和同行混播草地0～20cm土层有机质含量大于单播紫花苜蓿草地,20～30cm不显著,30～40cm单播紫花苜蓿草地显著增加,分别是隔行混播草地、同行混播和单播无芒雀麦草地的1.11、1.72和1.94倍;速效N单播无芒雀麦草地最低,速效P、速效K单播紫花苜蓿草地最低.

Effect of Sowing Methods on Nutrients Distribution of Soil Profiles in Mixed Grassland (Alfalfa+Bromus inermis)

In this paper,two-year old single seeding and mixed sowing Alfalfa and Bromus inermis on experimental farm were studied with field survey and laboratory analysis in Inner Mongolia University for Nationalities.Multi-layer sampling method was used to study the effect of sowing methods on physical and chemical properties of soil.The result showed that the bulk density of soil was the samllest in single seeding Bromus inermis,but in single seeding Alfalfa it was the largest.The content of organic matter in soil plough layer in single seeding Alfalfa was the least,but in 30-40 layer the content increase a lot,higher than any other sowing methods.The concent of available N was the least in single seeding Bromus inermis,and the concent of available P,available K was the laest in single seeding Alfalfa.