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Toxicity threshold of lead (Pb) to nitrifying microorganisms in soils determined by substrate-induced nitrification assay and prediction model

文献类型： 外文期刊

作者： Zheng Han 1 ; Chen Li 2 ; Li Ning 1 ; Liu Bin 1 ; Meng Nan 1 ; Wang Meng 1 ; Chen Shi-bao 1 ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Plant Nutr & Fertilizer, Minist Agr, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Plant Protect & Environm Protect, Beijing 100097, Peoples R China

关键词： dose-response;lead (Pb);polluted soil;substrate-induced nitrification

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2017 年 16 卷 8 期

页码：

收录情况： SCI

摘要： Lead (Pb) contamination has often been recorded in Chinese field soils. In recent years, efforts have been made to investigate Pb toxicity thresholds in soils with plant growth and microbial assays. However, the influence of soil properties on Pb toxicity impacts on soil microbial processes is poorly understood. In this study ten soils with different properties were collected in China to investigate the relationships between thresholds of Pb toxicity to soil microbes and soil properties. The effect of soil leaching on Pb toxicity was also investigated to determine the possible influence of added anions on Pb toxicity during dose-response tests. Toxicity was inferred by measuring substrate-induced nitrification in leached and non-leached soils after Pb addition. We found that soil microbe Pb toxicity thresholds (EC, x=10, 50) differed significantly between the soils; the 10% inhibition ratio values (EC10) ranged from 86 to 218 mg kg(-1) in non-leached soils and from 101 to 313 mg kg(-1) in leached soils. The 50% inhibition ratio values (EC50) ranged from 403 to 969 mg kg(-1) in non-leached soils and from 494 to 1603 mg kg(-1) in leached soils. Soil leaching increased EC10 and EC50 values by an average leaching factor (LF) of 1.46 and 1.33, respectively. Stepwise multiple regression models predicting Pb toxicity to soil microbes were developed based on EC, and soil properties. Based on these models, soil pH and organic carbon are the most important soil properties affecting Pb toxicity thresholds (R-2>0.60). The quantitative relationship between Pb toxicity and soil properties will be helpful for developing soil-specific guidance on Pb toxicity thresholds in Chinese field soils.

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