温室蔬菜栽培对土壤DTPA浸提态铁锰铜锌含量的影响

对沈阳市大民屯镇蔬菜生产基地温室番茄栽培条件下0~30 cm土层土壤DTPA浸提态微量元素含量的调查表明,温室土壤DTPA浸提态Mn、Cu、Zn含量高于相邻的露地菜田,0~20 cm土层DTPA-Fe含量低于露地土壤。与露地菜田相比,高量施肥条件下温室土壤DTPA-Zn富集是微量元素变化的一个主要特征,11年和5年温室土壤0~20 cm土层DTPA-Zn平均含量分别是露地菜田的4.0和4.8倍。温室栽培条件下高量施用有机肥、土壤pH降低及土壤Eh变化是引起土壤DTPA浸提态微量元素变化的主要因素。

Influence of Vegetable Cultivation in Greenhouse on DTPA Extractable Soil Fe, Mn, Cu and Zn

The contents of DTPA extractable microelements in soil at the depth of 0～30 cm under greenhouse tomato cultivation were examined in the Damingtun Town vegetable production base,Shenyang City.Results showed that DTPA extractable soil Mn,Cu and Zn contents at the depth of 0～30 cm in greenhouse were greater than in the control soil,while DTPA-Fe content at the depth of 0～20 cm was lower in greenhouse soils than in their adjacent open field.Compared with the open field,the enrichment of DTPA-Zn in greenhouse soils under heavy application of fertilizers was a striking feature.DTPA-Zn contents were 4.0 and 4.8 times as much in 5 and 11 year-greenhouses,respectively,as in the open field.Heavy application of organic manure,lowed soil pH and varied soil Eh were regarded as the main factors that influenced the changes of DTPA extractable microelements contents in soils under greenhouse cultivation.