Ecological risk of combined pollution on soil ecosystem functions: Insight from the functional sensitivity and stability
2019
Jiang, Rong | Wang, Meie | Chen, Weiping | Li, Xuzhi | Balseiro-Romero, Maria | Baveye, Philippe | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences ; Chinese Academy of Sciences [Beijing] (CAS) | University of Chinese Academy of Sciences [Beijing] (UCAS) | State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control ; Nanjing Institute of Environmental Science of the Ministry of Environmental Protection | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Universidade de Santiago de Compostela [Spain] (USC ) | National Key R&D Program of China [2018YFC1800505]; Special Foundation of the State Key Lab of Urban and Regional Ecology
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Show more [+] Less [-]English. Assessing the ecological risk of combined pollution, especially from a holistic perspective with the consideration of the overarching functions of soil ecosystem, is crucial and beneficial to the improvement of ecological risk assessment (ERA) framework. In this study, four soils with similar physicochemical properties but contrasting heavy metals contamination levels were selected to explore changes in the integrated functional sensitivity (MSI), resistance (MRS) and resilience (MRL) of soil microbial communities subjected to herbicide siduron, based on which the ecological risk of the accumulation of siduron in the four studied soils were evaluated. The results suggested that the microbial biomass carbon, activity of denitrification enzyme and nitrogenase were indicative of MSI and MRS, and the same three parameters plus soil basal respiration were indicative of MRL. Significant dose-effect relationships between siduron residues in soils and MSI, MRS and MRL under combined pollution were observed. Heavy metal polluted soils showed higher sensitivity and lower resistance to the additional disturbance of herbicide siduron due to the lower microbial biomass, while the resilience of heavy metal polluted soils was much higher due to the pre-adaption to the chemical stresses. The quantifiable indicator microbial functional stability was incorporated in the framework of ERA and the results showed that the accumulation of siduron in the studied soils could exhibit potential harm to the integrated functional stability of soil microbial community. Thus, this work provides insights into the application of integrated function of soil microbial community into the framework of ERA.
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