西安市近郊土壤肥力调查与评价

Investigation and Evaluation of Soil Fertility of the Suburbs of Xi'an City

通过监测土壤肥力评价常用的有机质、全氮、全磷、全钾、有效磷、速效钾、p H等7项评价指标,对西安市近郊4个方位的土壤肥力进行了评价。结果表明:在西安市近郊的4个方位上,土壤中p H值普遍在8.5左右,显略碱性;有机质的含量普遍处于稍缺状态,北郊的有机质含量相对比较丰富,最高为2.64%;全氮含量相对较好,全钾含量均处于较缺状态,北郊的全钾含量较高,为4.17 g/kg;全磷含量均处于0.66 g/kg左右,属中等状态;有效磷含量处于中等含量水平,南郊较低,平均为7.3 mg/kg,最低至3 mg/kg;速效钾含量东郊为37.93 mg/kg,含量较少,处于较缺状态,其余3个郊区均处于稍缺状态。

By evaluation of 7 common indicators for soil fertility monitoring including organic matter, total nitrogen, total phosphorus, total potassium, available phosphorus, available potassium and p H value, the soil fertility in four cardinals of the suburbs of Xi＇an City was assessed. The result indicated that in the four cardinals, p H value in soils was generally about 8.5 in a slightly alkaline condition; the content of organic matter appeared generally in a slight shortage, but that in the soils of the north suburbs was relatively richer, with the maximal of 2.64%; the situation of TN content was relatively good; the content of total potassium was all in a lack state, but that in the soils of the north suburbs was comparatively higher as about 4.17g/kg; the TP content was all about 0.66g/kg in a medium state; the content of available phosphorus was in a medium level, but that in the soils of the south suburbs was lower as 7.3 mg/kg averagely, with minimal of 3 mg/kg; the content of available potassium in the soils of the east suburbs was 37.93 mg/kg in a rather lack state, but that in the soils of the other three cardinals of the suburbs was just slightly deficient.