土壤跳虫(Folsomia candida)对食物中铜污染物的吸收和排泄Assimilation and Excretion of Copper Contained in Food by Soil Collembolan(Folsomia candida)
李晓勇;骆永明;柯欣;孙明明;
摘要(Abstract):
重金属污染物在生物体内的累积、迁移和传递已成为当今的研究热点。土壤弹尾目昆虫作为土壤生态系统的重要组成部分,针对其对重金属的吸收、积累和排泄的动态过程以及相应解毒机制的研究意义重大。本研究通过弹尾目跳虫(Folsomia candida)对Cu的吸收-排泄效率实验发现,跳虫体内Cu含量随暴露时间的延长而显著增加(r~2=0.8878,F_(1,5)=29.59,P<0.01);跳虫体内Cu含量随排泄时间的延长而明显逐渐降低(r~2=0.7836,F_(1,3)=7.13,P<0.01)。跳虫对Cu的吸收-排泄Budget实验表明,只有少量的Cu被跳虫摄取到体内,其中小部分被体内组织消化吸收,大部分则可能通过中肠细胞的褪皮作用和产卵等方式排出体外。可见,褪皮和排卵是跳虫排泄重金属Cu的重要途径,跳虫对Cu具有较低的吸收率(8.13%)和较高的排泄率(57.3%),表明跳虫对Cu可能有较高的耐受性。
关键词(KeyWords): 土壤弹尾目;跳虫;铜;食物喂养;吸收率;排泄率
基金项目(Foundation): 国家自然科学基金项目(40671105;40432005;40971157);; 中国科学院土壤环境与污染修复重点实验室开放基金
作者(Author): 李晓勇;骆永明;柯欣;孙明明;
Email:
DOI:
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