Microbial Activity Indices: Sensitive Soil Quality Indicators for Trace Metal Stress

LI Yong-Tao; T.BECQUER; C.QUANTIN; M.BENEDETTI; P.LAVELLE; DAI Jun

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Microbial Activity Indices: Sensitive Soil Quality Indicators for Trace Metal Stress

机译：微生物活性指标：痕量金属胁迫的敏感土壤质量指标

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Physicochemical properties, total and DTPA (diethylenetriaminepentaacetic acid)-extractable Cu, Zn, Pb and Cd contents, microbial biomass carbon (C) content and the organic C mineralization rate of the soils in a long-term trace metal-contaminated paddy region of Guangdong, China were determined to assess the sensitivity of microbial indices to moderately metal-contaminated paddy soils. The mean contents of total Cu, Zn, Pb and Cd were 251,250, 171, and 2.4mg kg-1 respectively. DTPA-extractable metals were correlated positively and significantly with total metals, CEC, and organic C (except for DTPA-extractable Cd), while they were negatively and highly significantly correlated with pH, total Fe and Mn. Metal stress resulted in relatively low ratios of microbial biomass C to organic C and in remarkable inhibition of the microbial metabolic quotient and C mineralization rate, which eventually led to increases in soil organic C and C/N. Moreover, microbial respiratory activity showed a stronger correlation to DTPA-extractable metals than to total metal content. Likewise, in the acid paddy soils some "linked" microbial activity indices, such as metabolic quotient and ratios of basal respiration to organic C, especially during initial incubation, were found to be more sensitive indicators of soil trace metal contamination than microbial biomass C or basal respiration alone.

机译：长期痕量金属污染的水稻田土壤的理化特性，总和可提取的DTPA（二亚乙基三胺五乙酸）的Cu，Zn，Pb和Cd含量，微生物生物量碳（C）含量和有机碳矿化率，中国决心评估微生物指标对中等金属污染的稻田土壤的敏感性。总铜，锌，铅和镉的平均含量分别为251,250、171和2.4mg kg-1。 DTPA可萃取金属与总金属，CEC和有机碳（除DTPA可萃取Cd除外）呈正相关且显着相关，而它们与pH值，总Fe和Mn呈负相关且高度显着相关。金属胁迫导致微生物生物量碳与有机碳的比率相对较低，并显着抑制了微生物的代谢商和碳矿化速率，最终导致土壤有机碳和碳/氮增加。此外，微生物的呼吸活动与DTPA可提取金属的相关性强于与总金属含量的相关性。同样，在酸性稻田土壤中，某些“连锁”微生物活动指数，例如代谢商和基础呼吸与有机碳的比率，特别是在初始培养期间，被发现比微生物生物量C或C更能反映土壤中痕量金属的污染。仅基础呼吸。

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来源
《土壤圈（英文版）》 |2005年第4期|409-416|共8页
作者
LI Yong-Tao; T.BECQUER; C.QUANTIN; M.BENEDETTI; P.LAVELLE; DAI Jun;
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作者单位

College of Natural Resources and Environment, South China Agricutrual University, Guangzhou 510642 China;

UMR 137 Biodiversite et Fonctionnement des Sols, Institut de Recherche Pour le Développement ,France;

Universite Paris Sud XI FRE Orsay Terre 2566 Bat, 504 91405 Cedex ,France;

UMR-CNRS 7047, Lab. de Geochimie et Métallogénie/Université Pierre et Marie Curie ,France;

UMR 137 Biodiversite et Fonctionnement des Sols, Institut de Recherche Pour le Développement ,France;

College of Natural Resources and Environment, South China Agricutrual University, Guangzhou 510642 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类土壤学;
关键词
availability; indication; microbial characteristics; trace metals;

机译：可用性;指示;微生物特性;痕量金属;

Microbial Activity Indices: Sensitive Soil Quality Indicators for Trace Metal Stress

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