铅与对二氯苯复合污染对小麦和大白菜种子发芽及幼苗期生长的毒性

生态学杂志

铅与对二氯苯复合污染对小麦和大白菜种子发芽及幼苗期生长的毒性

晁雷^1,2；周启星¹；崔爽^1,2；陈苏^1,2；孙铁珩¹

¹中国科学院沈阳应用生态研究所陆地生态过程重点实验室，沈阳 110016；²中国科学院研究生院，北京 100039

收稿日期:2005-12-01 修回日期:2006-02-15 出版日期:2006-08-10 发布日期:2006-08-10

Joint toxicity of Pb²⁺ and PDB on seed germination and seedling growth of Triticum aestiuce and Brassica Pekimensis

CHAO Lei^1,2;ZHOU Qixing¹;CUI Shuang^1,2; CHEN Su^1,2;SUN Tieheng¹

¹Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ²Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Received:2005-12-01 Revised:2006-02-15 Online:2006-08-10 Published:2006-08-10

摘要/Abstract

摘要： 在草甸棕壤条件下，测定了铅（Pb²⁺）与对二氯苯（PDB）的单一及复合污染对小麦和大白菜种子发芽率、幼苗生物量（鲜重、干重）、芽伸长抑制率和根伸长抑制率的影响。结果表明，对外源污染物的敏感顺序为根伸长抑制率>芽伸长抑制率>幼苗鲜重>发芽率和幼苗干重。Pb²⁺与PDB复合污染的条件下，Pb²⁺的浓度为500 mg·kg^-1时，Pb²⁺与PDB处于协同效应。Pb²⁺的浓度为2 000 mg·kg^-1时，Pb与PDB联合毒性比较复杂。但不论对于小麦还是大白菜，Pb与PDB的联合作用更多的是依靠Pb²⁺的作用而不是PDB的作用。

关键词: 土壤储水量, 林地, 荒坡, 黄土高原, 年际变化

Abstract: With meadow brown soil as test soil, this paper studied the effects of single and combined pollution of Pb²⁺ and 1,4-dichlorobenzene (PDB) on the germination rate, biomass production, and shoot and root elongation of wheat (Triticum aestivum) and Chinese cabbage (Brassica pekimensis). The seeds of wheat and Chinese cabbage were exposed to various concentrations of PDB with or without lead addition. The sensitivity of test crops to the toxicity of the pollutants was in the sequence of root elongation>shoot elongation > biomass fresh weight > biomass dry weight and germination rate. When the concentration of added Pb²⁺ was 500 mg·kg^-1, lead and PDB had a synergistic effect of inhibiting shoot and root elongation. When the concentration of added Pb²⁺ was 2 000 mg·kg^-1, the pollutants had a synergistic effect of inhibiting shoot elongation but an antagonistic effect of inhibiting root elongation. For both wheat and Chinese cabbage, the joint toxicity of lead and PDB was more dependent on PDB’s concentration.

Key words: Amount of soil water stored, Forest land, Wasteland, Loess Plateau, Annual changes of soil moisture

晁雷；周启星；崔爽；陈苏；孙铁珩 . 铅与对二氯苯复合污染对小麦和大白菜种子发芽及幼苗期生长的毒性[J]. 生态学杂志.

CHAO Lei^1,2;ZHOU Qixing¹;CUI Shuang^1,2; CHEN Su^1,2;SUN Tieheng¹ . Joint toxicity of Pb²⁺ and PDB on seed germination and seedling growth of Triticum aestiuce and Brassica Pekimensis[J]. cje.

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