大庆不同土地利用下土壤理化性质及肥力变化

为了解大庆地区不同土地利用下土壤理化性质及肥力变化趋势,选择杨树林地、草甸地、农田地3类典型植被样地土壤进行野外采样,分析不同植被类型条件下土壤理化性质差异及肥力变化。结果表明:(1)草甸地土壤速效钾、有机质、含水率显著高于杨树林地和农田地,杨树林地土壤容重显著高于草甸地和农田地(P<0.05);(2)草甸、农田、杨树林地的土壤含水率、速效钾依次呈下降趋势,而土壤容重呈上升趋势,其中杨树林地理化性质随着龄级的增加,其变异系数呈下降趋势;(3)草甸(1.94)、农田(1.87)、杨树林(1.69)综合肥力呈中下水平,且依次呈下降趋势;建议土地管理中,多关注土壤物理结构的调整和改善。

Soil Physical and Chemical Properties and Fertility Under Different Land Use Patterns in Daqing

To understand the variation trend of soil physicochemical properties and fertility under different land use patterns in Daqing, three typical vegetation sampling plots, poplar forest land, meadow land and farmland land, were selected for analyzing the difference of soil physicochemical properties and fertility changes under different vegetation forms. The results showed that: (1) soil available potassium, organic matter and water content in meadow were significantly higher than those in poplar forest and farmland, and soil bulk density in poplar forest was significantly higher than that in meadow and farmland (P<0.05); (2) soil moisture content and available potassium in meadow, farmland and poplar forest showed a decreasing trend, while soil bulk density showed an increasing trend, among them, the physical and chemical properties of poplar forest showed a decreasing trend with the increase of age grade; (3) the comprehensive fertility of meadow (1.94), farmland (1.87) and poplar forest (1.69) belonged to the below-average level and had a decreasing trend successively. It is suggested that more attention should be paid to the adjustment and improvement of soil physical structure in land management.