Journal article

Water addition regulates the metabolic activity of ammonia oxidizers responding to environmental perturbations in dry subhumid ecosystems

Hang-Wei Hu, Catriona A Macdonald, Pankaj Trivedi, Bronwyn Holmes, Levente Bodrossy, Ji-Zheng He, Brajesh K Singh

Environmental Microbiology | WILEY | Published : 2015


Terrestrial arid and semi-arid ecosystems (drylands) constitute about 41% of the Earth's land surface and are predicted to experience increasing fluctuations in water and nitrogen availability. Mounting evidence has confirmed the significant importance of ammonia-oxidizing archaea (AOA) and bacteria (AOB) in nitrification, plant nitrogen availability and atmospheric N2 O emissions, but their responses to environmental perturbations in drylands remain largely unknown. Here we evaluate how the factorial combinations of irrigation and fertilization in forests and land-use change from grassland to forest affects the dynamics of AOA and AOB following a 6-year dryland field study. Potential nitrif..

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Awarded by Australian Research Council

Awarded by National Science Foundation of China

Awarded by Australian Greenhouse Office Grant

Awarded by NSW Department of Environment and Climate Change

Funding Acknowledgements

This work was financially supported by University of Western Sydney - Chinese Academy of Sciences bilateral agreement, Australian Research Council (DP130104841) and National Science Foundation of China (41025004). The site was established with support from the Australian Greenhouse Office Grant 0506/0085 and subsequently by the Commonwealth Department of Climate Change, with additional funding from the NSW Department of Environment and Climate Change (Grant T07 CAG/16). We gratefully acknowledge Luca Giaramida, Catarina Martins and Yong Zheng for their assistance during field sampling. Thanks to Barbara Drigo for great help in DNA stable isotope probing experiment.