农业环境科学学报Issue(9)：1721-1727,7.DOI:10.11654/jaes.2014.09.008
设施菜地土壤中速效磷是镉生物有效性的关键调控因子
Available Phosphorus is a Key Regulator of CadmiumPhytoavailability in Greenhouse Soils
摘要
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 corre-lated significantly with soil available phosphorus(AP), organic matter(OM)and pH value(P<0.05), but not with soil cationic exchange ca-pacity 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 green-house 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.关键词
设施菜地/镉生物有效性/关键调控因子/速效磷Key words
greenhouse soil/cadmium phytoavailability/key regulator/available phosphorus分类
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张水勤,李玲玲,王峰源,姜慧敏,张建峰,杨俊诚,郭俊娒,李先,刘恋,谢义琴..设施菜地土壤中速效磷是镉生物有效性的关键调控因子[J].农业环境科学学报,2014,(9):1721-1727,7.基金项目
农业部行业专项（201103007）；国家重点基础研究发展计划（973项目）（2013CB127406）；国家自然科学基金（21107139）；科技部科研院所技术开发研究专项资金（2012EG134235）；科技部农业科技成果转化资金（2012GB23260542）；中央级公益性科研院所专项资金 （）
