褐土施N i对小白菜的生物效应及临界值的研究  

Biological Impact of Nickel Pollution on Pakchois in Drab Soil and Its Critical Value.

作　　者：马建军[1] 朱京涛[1] 于凤鸣[1] 刘永军[2] 张淑侠[3] 

机构地区：[1]河北科技师范学院科研处,河北秦皇岛066004 [2]河北科技师范学院生命科学系,河北秦皇岛066004 [3]河北科技师范学院分析测试中心,河北秦皇岛066004

出　　处：《生态与农村环境学报》2006年第1期75-79,共5页Journal of Ecology and Rural Environment

基　　金：河北省教育厅科学基金资助项目(2003242)

摘　　要：研究了褐土施镍（Ni）对小白菜生长发育及矿质营养吸收与积累的影响。依据小白菜生物量的变化，用茎叶Ni含量及土壤有效态Ni含量来表征土壤Ni污染的毒性临界值。结果表明，施Ni量在0—25mg·kg^-1范围促进小白菜鲜重增加、干物质积累降低；随施Ni量增加，生物量呈极显著下降。褐土施Ni影响矿质营养元素的吸收和积累，且随施Ni量的增加表现出一定的协同和拮抗作用。以生物量减产10％为依据，确定褐土施Ni的毒性临界值为：土壤全Ni含量57．22mg·kg^-1，土壤有效态Ni含量8．59mg·kg^-1（用DTPA提取液）和茎叶Ni含量20．51mg·kg^-1。In a pot experiment impact of Ni addition on growth and absorption and accumulation of mineral nutrients of pakchois in the drab soil was studied. Variation of pakchoi biomass, Ni content in pakchois and available Ni content in soil are three major indexes to characterize critical value of Ni toxicity. Results show with Ni application rate rising from 0-25 mg · kg^-1, the fresh weight of pakchois increased, but its dry weights decreased. With Ni application rate rising on, the biomass of pakchois decreased remarkably. Ni content in pakchois was negatively related to the biomass of the plant. Ni application affected the plant adsorption and accumulation of other mineral nutrients, which showed certain synergia or antagonism. With the reduction of biomass by 10% as an index, the critical value of Ni toxicity in drab soil was defined to be 57.22 mg · kg^- 1 and 8.59 mg · kg^-1 for total Ni and available Ni （extracted by DTPA ）in the soil respectively, and 20.51 mg · kg^-1 Ni in stems and leaves of pakchois.

关 键 词：褐土 NI 小白菜 生物效应 毒性临界值 

分 类 号：X503.231[环境科学与工程—环境工程]