温室土壤剖面养分特征及重金属含量演变趋势研究

对沈阳市郊不同种植年限温室土壤速效氮、磷、钾剖面特征及重金属Cu、Zn、Cd、Pb含量调查表明,随温室种植年限的增加,速效氮、速效磷含量在整个剖面内显著增加,与种植年限呈极显著正相关,速效钾含量增幅较小,说明温室N、P、K肥施用不均衡;重金属Cu、Zn、Pb含量随温室种植年限的增加有一定增加,Cd含量则随种植年限增加变化较小。农田及温室重金属含量较土壤背景值有一定程度增加,但均未超过国家土壤环境质量标准,尚未形成污染。

Profile characteristics of available nutrients and heavy metal concent rations in greenhouse soils

The profile characteristics of available N,P,K and heavy metal concentrations in greenhouse soils of Shenyang suburb were studied.The results show that with the planting years going by,the available N and P have a significant increase,have a significant positive correlation with the planting years and the available K also has increased for some extent,but not so high.The contents of heavy metals copper,zinc,cadmium and lead in the protected soil of the greenhouse are higher than those of field,and with the prolongation of planting years,their concentrations are also going up,but they do not exceed the quality criterion of soil environment.