日光温室土壤养分变化及次生盐渍化程度与种植年限的关系

Relationship between soil nutrient change,secondary salinization degree and planting years in solar greenhouse

以泾阳县7个镇的1 038栋日光温室内的土壤为研究对象,进行了土壤养分含量、pH值及电导率测定,研究日光温室内的土壤理化性质变化与种植年限的关系,为明确土壤肥力、存在问题和科学施肥提供理论依据。结果表明,随着种植年限的延长,日光温室土壤有机质先增加后减少;碱解氮、有效磷平均含量在16~20年期间达到最大;速效钾在各年限阶段平均值均大于600 mg·kg^(-1);日光温室土壤EC值大于500μS·cm^(-1),表明土壤次生盐渍化趋势明显;土壤p H值均大于7.0,为碱性土。综上所述,该地区日光温室普遍发生了不同程度的土壤次生盐渍化现象,但与种植年限关系不明显。

Taking 1038 soil samples of solar greenhouse in 7 towns of Jingyang county as materials,the contents of soil nutrient,pH and EC value were measured,and the relationship between the changes of soil physical,chemical properties and soil planting years in the solar greenhouse was studied to clarify the soil fertility of greenhouse and the problems of production,and provide a theoretical basis for scientific fertilization.The results showed that,along with the soil planting years in the greenhouse,the contents of soil organic matter increased first and then decreased;the average content of alkali nitrogen and available phosphorus reached the maximum during the period of 16~20 years;the average value of available potassium in each period was more than 600 mg·kg-1.The mean value of soil EC was more than 500μS·cm-1,indicating a trend of soil secondary salinization;all the soil pH values were greater than 7.0,which meant they belong to alkaline soil.In summary,different degrees of soil secondary salinization had occurred in solar greenhouses in this region,but the relationship between soil secondary salinization and soil planting years of greenhouse was not obvious.