【摘要】 通过对不同生长年限苜蓿地各土层水溶性盐、有机质、pH值、全氮、水解性氮、全磷、有效磷、全钾及有效钾的测定分析,研究了不同生长年限苜蓿(Medicago sativa)对松嫩平原西部盐碱地土壤肥力年际变化和垂直分布的影响。结果表明,种植苜蓿能够有效降低土壤pH值和水溶性盐含量;播种当年,苜蓿地各土层全氮、水解性氮、全磷以及速效钾的含量都有下降。播种两年以上的苜蓿地,土壤有机质、全磷、全氮和水解性氮含量都有所提高。空白地及各苜蓿地有效磷含量随土层深度的加深呈递减趋势,表层速效钾的含量最高。更多还原

【Abstract】 By determining and analyzing water soluble salt,organic matter,pH value,total N,hydrolytic N,total P,available P,total K and available K of each soil layer in alfalfa fields with different growth years,the effect of alfalfa with different growth years on the interannual variability and vertical distribution of soil fertility in saline-alkali land in western Songnen plain.The results showed that growing alfalfa could decrease soil pH value and water soluble salt content effectively.The contents of total N,hydrolytic N,total P and available K of each soil layer in alfalfa field had all declined in the seeding year.The contents of organic matter,total P,total N and hydrolytic N were all increased in alfalfa field sown for more than 2 years.The contents of available P in the CK and each alfalfa field tend to decrease progressively with soil layer’s decline,and the content of available K was highest in the surface layer.更多还原