黄土高原坡地密植枣园土壤质地与肥力状况分析

采用田间取样与实验室分析相结合的方法,研究了黄土高原坡地密植枣园土壤质地与肥力状况。结果表明,坡地枣园土壤肥力低,氮、磷严重缺乏,钾相对丰富,土壤属于砂壤土,通气性强,保肥、保水性差。0~60 cm土壤有机质含量为1.687~5.002 mg/kg;全氮为0.072~0.316 g/kg;硝酸盐为2.325~16.846 g/kg;铵态氮为1.187~2.146 g/kg,速效磷为0.270~2.480 mg/kg,速效钾为51.9~169.1 mg/kg,并且含量均随剖面向下减少。颗粒组成大部分为粉砂粒,含量一般在65.75%~68.98%;随有机质含量升高,0.25~0.05 mm微团聚体数量呈上升趋势,二者为正相关;<0.05 mm微团聚体含量则逐渐下降,二者呈负相关。黄土高原坡地密植枣园土壤肥力总体水平很低。除了速效钾为中等级外,有机质、全氮、碱解氮、速效磷均为很低等级。

Study was made on the soil texture and fertility status of hillside close-planting jujube field on the Loess Plateau.The results displayed: The soil appears low-fertility due to serious lack of N,P but K;The soil is sandy loam that has good soil aeration but bad water and nutrient retention.The content of soil nutrients of 0～60 cm is as follows: organic matter: 1.687～5.002 mg/kg, total N: 0.072～0.316 g/kg,NO3——N: 2.325～16.846 g/kg,NH4+-N: 1.187～2.146 g/kg,avail-P: 0.270～2.480 mg/kg,avail-K: 51.9～169.1 mg/kg...