日光温室土壤养分变化状况及累积特征的研究

采集山东济南日光温室蔬菜地表层土壤(0~20 cm)和棚外露地表层土壤,测定有机质、碱解氮、速效磷、速效钾、pH、电导率等土壤养分含量,通过分析结果表明,日光温室蔬菜土壤有机质含量平均值21.6 g/kg,碱解氮含量平均值为115.4 mg/kg,土壤速效磷含量平均值为122.4 mg/kg,速效钾含量平均值为455.5 mg/kg,pH平均值为7.90,电导率平均值为0.457 ms/cm,其中有机质、碱解氮、速效磷、速效钾、电导率显著高于露地土壤,增幅分别为77.0%,66.7%,472.0%,173.4%,60.9%;而pH低于露地土壤0.23。日光温室土壤有机质、碱解氮的积累规律不明显;速效磷、速效钾、电导率、pH与棚龄间有明显的累积规律,其相关系数分别为0.7368,0.60,0.6547,-0.7206。日光温室土壤有明显的酸化和盐渍化现象,各种养分大量累积。

Study on the Changes and Characteristics of Accumulation of Soil Nutrition in Solar Greenhouse

The vegetable fields topsiol(0-20 cm)of solar greenhouse and the outdoor open field topsoil were collected in Jinan,Shandong province to measure the content of the organic C,alkali-N,avail-P,avail-K,pH,electric conductivity rate etc.The result showed that:the averaged content of organic C in the vegetable field siol of solar greenhouse was 21.6 g/kg,higher than that in the open field soil by 77%.The soil alkali-N content,the avail-P content,the avail-K content in the greenhouse were 115.4,122.4,455.5 mg/kg ...