西红柿镍毒害的土壤主控因子和预测模型研究Major Soil Factors Controlling Nickel Toxicity to Tomato in a Wide Range of Chinese Soils and the Predictable Models
张洪涛;李波;刘继芳;马义兵;韦东普;
摘要(Abstract)：
选取我国有代表性的17种土壤,运用生态毒理学方法研究了土壤中外源镍(Ni)对西红柿的毒性,结果发现土壤中外源Ni对西红柿的生长毒性主要受土壤pH值、有机碳含量的影响.在供试淋洗(使用模拟的人工雨水滤洗定量的土壤样品)和非淋洗土壤中,Ni对西红柿生物量50%抑制的毒性阈值(EC50)范围分别从11mg·kg-1到932mg·kg-1和从7mg·kg-1到2055mg·kg-1,其最大值和最小值比例分别达到了85和294倍.土壤pH值是土壤中Ni对西红柿生长毒性的主控因子,进一步引入土壤有机碳因子时,淋洗和非淋洗土壤理化性质和EC50之间回归方程的决定系数R2由0.853和0.743分别提高到了0.925和0.824.利用土壤性状(土壤pH值、有机碳含量)可以较好地预测土壤中外源Ni对西红柿生长的毒性阈值.
关键词(KeyWords)： 镍;植物毒性;土壤性质;淋洗;西红柿
基金项目(Foundation): 国家自然科学基金项目(No.20677077;No.40620120436);; 国际铜业协会、国际镍协会和澳大利亚力拓矿业集团资助
作者(Author): 张洪涛;李波;刘继芳;马义兵;韦东普;
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DOI:
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