2D visualization captures the local heterogeneity of oxidative metabolism across soils from diverse land use
- Title
- 2D visualization captures the local heterogeneity of oxidative metabolism across soils from diverse land use
- Author
- Dutta, Tanushree
- Keywords
- Real-time oxygen imaging; Interspersion; Planar optode; Microbial activity; Micro-habitats; Labile substrate addition
- Issue Date
- 2016-07
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- SCIENCE OF THE TOTAL ENVIRONMENT (2016), Page. 713-723
- Abstract
- Fine-scale processes in soils affect large-scale phenomena by controlling mixing and reaction rates, yet technological constraints have hampered the collection of micro-scale kinetic data. As a result, limited information is available on the magnitude of fine-scale biogeochemical rates and their temporal and spatial pattern in response to environmental perturbations. In this work we investigate the spatio-temporal dynamics in oxidative microbial activity and the development of anoxic micro zones (i.e., anoxic hot-spots) at the microscopic level ( mu m - cm). These analyses rely on novel non-invasive & non-destructive optodes, which are able to capture real-time imaging of oxygen concentrations over time at an interval of twenty seconds. Results showed that labile carbon addition resulted in maximum rates of local metabolic activity within a few minutes (5 to 15) and led to the subsequent formation of anoxic hot-spots. Different areas within a given soil sample presented up to one order of magnitude variation in metabolic rate values. As a result, oxic and anoxic micro-zones coexisted closely. The relationship between oxygen concentrations and heterogeneity of oxidative metabolism resulted in an initial increase in metabolic heterogeneity over time followed by a decrease when anoxic conditions dominated. A similar link was found by comparing metabolic activity and its heterogeneity across a range of soil types. These results demonstrate that the microbial activity and hot-spot development can be monitored by using a non-invasive quantitative imaging system that allows real-time monitoring of spatial oxygen distribution. We conclude that local dynamics of heterogeneity in space and time at the fine-scale present the same functional behavior encountered in most ecosystems at the landscape-scale. (C) 2016 Published by Elsevier B.V.
- URI
- https://www.sciencedirect.com/science/article/pii/S0048969716314437?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/74648
- ISSN
- 0048-9697; 1879-1026
- DOI
- 10.1016/j.scitotenv.2016.06.252
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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