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| Available Phosphorus is a Key Regulator of Cadmium Phytoavailability in Greenhouse Soils |
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| KeyWord:greenhouse soil; cadmium phytoavailability; key regulator; available phosphorus |
| Author Name | Affiliation | | ZHANG Shui-qin | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | WANG Feng-yuan | College of Environment, Liaoning University, Shenyang 110036, China | | JIANG Hui-min | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | ZHANG Jian-feng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | YANG Jun-cheng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | GUO Jun-mei | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | LI Xian | Hunan Institute of Nuclear Agronomy and Astronautics Breeding, Changsha 410125, China | | LIU Lian | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | XIE Yi-qin | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | LI Ling-ling | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China |
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| Abstract: |
| A large number of soil samples from greenhouse facilities was obtained to study the phytoavailability of cadmium（Cd） and its influencing factors using correlation, regression and principal component analysis. The content of available Cd（CdA） in the soils was correlated significantly with soil available phosphorus（AP）, organic matter（OM） and pH value（P<0.05）, but not with soil cationic exchange capacity and electric conductivity, implying that AP, OM and pH were the main influencing factors of CdA. Single regression equations of CdA-AP, CdA-OM, and CdA-pH were y1[CdA]=0.501 5x1[AP]+0.010 6 （R2=0.345 2, P<0.01）, y2[CdA]= 0.370 7x2[OM]+0.028 6（R2=0.139 0, P<0.01） and y3[CdA]=-0.055 2x3[pH]+0.564 1（R2=0.050 9, P<0.05）, respectively, while multiple regression equation y4[CdA]=0.174 8+ 0.435 2x1[AP]+0.049 0lgx2[OM]-0.013 2 x3[pH]（R2=0.368 6，P<0.01）. Principal component analysis showed that AP was the key regulator of CdA in the greenhouse soils. Correlation coefficient（r=0.464） between Cd contents in vegetable fruits（CdP） and soil CdA was higher than that（r=0.387） between CdP and total cadmium（CdT）, suggesting that CdA would be better to assess Cd contamination in vegetable fruits and to predict the safety risk for vegetable production than soil CdT. Therefore, it is necessary to regulate soil available phosphorus to reduce Cd phytoavailability so as to guarantee the food safety of greenhouse vegetables. |
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