摘要： 以海河低平原杨农复合系统为研究对象,针对4年树龄的杨树进行间伐(Intermediate cutting)处理,通过不同间伐模式下1年后土壤0~200 cm有机质、全氮、速效磷和速效钾含量的测定,初步研究土壤养分的垂直分布特征。结果表明,不同间伐模式下土壤有机质、全氮、速效磷和速效钾含量具有明显的垂直分布特征,其中有机质和全氮自上而下呈现递减趋势,速效磷自上而下呈现U型变化趋势,速效钾自上而下呈现波动趋势。两种杨树间伐模式10 m×2 m和5 m×4 m,与常规(Traditional)5 m×2 m相比,土壤表层(0~20 cm)有机质、全氮、速效磷的含量无显著性差异,速效钾含量有显著性差异。在40~140 cm土层间伐10 m×2 m模式的土壤养分含量显著高于常规5 m×2 m和间伐5 m×4 m,杨树间伐10 m×2 m处理较常规5 m×2 m处理和间伐5 m×4 m处理具有更好的土壤养分保持功能。

关键词: 杨农复合系统, 间伐模式, 土壤有机质, 土壤全氮, 土壤速效磷, 土壤速效钾

Abstract: "This study was conducted in the low Hai River plain and the subject of experiment is poplar-crop agroforestry.When poplar was 4 years old,some poplars were cut down for different intermediate cutting treatments.The vertical distribution characteristics of soil nutrients in poplar-crop agroforestry under different intermediate cutting patterns were analyzed,by measuring the contents of soil organic matter,soil total nitrogen,soil rapidly available phosphorus and soil rapidly available potassium at 0-200 cm after 1 annual's intermediate cutting.Results showed:The vertical distribution characteristics of soil nutrients have regularities under different intermediate cutting patterns.The contents of soil organic matter and soil total nitrogen were decrease from above to the below.The variation trend of soil rapidly available phosphorus content was similar to the form of U.The variation trend of soil rapidly available potassium content was fluctuant.Comparing and contrasting the intermediate cutting patterns(10 m×2 m treatment and 5 m×4 m treatment) and the traditional poplar-crop agroforestry,there was no significant difference in the surface(0-20 cm) of soil nutrients except soil available potassium.The soil nutrients contents of intermediate cutting pattern 10 m×2 m were significant higher than the traditional poplar-crop agroforestry and intermediate cutting pattern 5 m×4 m at 40-140 cm.It expounds intermediate cutting pattern 10 m×2 m has better retentive power of soil nutrients. "

中图分类号: 

• S714