Greenhouse soils have different biogeochemical characteristics from natural soils.Therefore,it is important to reveal the accumulation and ecological risks of soil heavy metals for sustainable production of greenhouse soil.This study was carried out to examine the ef-fects of cropping methods and greenhouse ages on the total and bioavailable content of soil heavy metals(Pb,Cr,Cd,As),in a coastal greenhouse area in Jiangsu Province,China,a rapid development area of high-efficiency agriculture.Results indicat...