退耕还(林)草多年生栽培草地土壤养分特征研究

Study on characters of soil nutrition of perennial pasture

分析了不同类型退耕还（林）草多年生栽培草地的土壤养分，结果表明：退耕还（林）草不同类型栽培草地的土壤有机质、全氮、全磷、速效氮、速效磷随着土层的加深，均呈现下降的趋势，但土壤全磷的变化幅度较小。退耕还（林）草不同类型栽培草地与其各自对照区的土壤有机质、全氮、全磷、速效氮、速效磷在0～10、10-20cm土层上多呈现显著差异（P〈0．05）。总之，退耕还（林）草多年生栽培草地的土壤养分含量总体上均低于其对照的土壤，并且都主要集中在表层土壤中。

The contents of soil nutrients of different types and planting times of perennial sown pasture established in ＂grain for green＂ project were measured. The result showed that the contents of soil organic matter, total N, total P, available N and available P decreased with the soil depth, in which, the variation range of total P was small. Compared to the control, the contents of soil nutrients of pasture were significantly increased within 0 to 10 cm and 10 to 20 cm soil layers （P〈0.05） and the soil nutrients were mainly accumulated in surface layer.