Spatial Distribution Features of Main Heavy Metal Elements in Greenhouse Soil under Rotation Mode
Sun Kaining
Wang Kean
Yang Ning
LüXiaohui
Abstract：Selecting typical greenhouses as research objects,the spatial distribution features of Cd,As, Pb,Cr,Cu and Ni under two planting patterns (continuous cropping and crop rotation)were investigated and studied.The results showed that under the condition of continuous cropping,the contents of Cd,Pb,Cr,Cu in the soil had surface aggregation tendency,and 0 ~20 cm plow layer was the main distribution area.Mean-while,the deeper the soil layer,the lower the contents.The As,Ni contents showed the trend of firstly in-creased and then decreased within the 0 ~60 cm soil layer.According to HJ 333—2006 “greenhouse vegeta-ble production environment quality assessment standards”,the Cd,As contents in the 0 ~20 cm soil layer un-der continuous cropping pattern exceeded the limited value of 220% and 15.6%,respectively.The rotation mode could significantly decrease the contents of Cd and As in 0 ~20 cm plow layer by 37.5% and 6.2%, respectively.Compared with the continuous cropping,the crop rotation increased the contents of 6 kinds of heavy metal elements in 20 ~40 cm soil layer.In summary,the rotation mode could reduce the heavy metals accumulation in plow layer after greenhouse suffered heavy metal pollution,and make them move down to the subsoil to reduce the absorption of agricultural products to heavy metal pollutants.
Keywords：RotationGreenhouseHeavy metalPollution
Publication Date：2016-10-31
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 81-84 )