Zhen Tao, Zhongyang Li, Siyi Li, Lijuan Zhao, Andrew S. Gregory, Xiangyang Fan, Chuncheng Liu, Chao Hu, Yuan Liu
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引用次数: 0
Abstract
It is generally accepted that inhibitors are effective in reducing agricultural nitrous oxide (N2O) emissions from soils irrigated by groundwater. However, it was unclear whether these inhibitors effectively regulate N2O emissions from soils irrigated with alternative waters, like reclaimed water and livestock wastewater. To clarify this, nitrapyrin, a nitrification inhibitor, and N-(N-butyl) thiophosphoric triamide, a urease inhibitor, were added separately or jointly to the soils irrigated by groundwater, reclaimed water and livestock wastewater through two consecutive cycles of pot experiment. Both the single and combined addition of inhibitors lowered N2O emissions from soils irrigated with alternative water, while the reduction effect of the combined application decreased relative to that of the single application. The using of combined inhibitors did reduce the enrichment level of nitrification genes and slow down the nitrification process, but the associated relatively high nirS/nosZ ratio potentially discounted its ability to prevent N2O emissions. Whereas under groundwater irrigation, treatment with combined inhibitors only decreased N2O emissions in the first cycle but not in the second cycle. Inhibitor application affected the composition of soil bacterial communities, and in particular, urease inhibitor application increased community differences across the two cycles. Moreover, using inhibitors led to a general reduction in the enrichment level of the denitrification genes narG and nosZ, and we speculate that inhibitors could also indirectly manipulate N2O release by involving the denitrification process. Structural equation model results further displayed that the relative abundance of the nxrA and narG genes and NH4+-N concentration played a vital role in the regulation of N2O release from the alternative water-irrigated soils applied with inhibitors.
期刊介绍：
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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