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Response of microbial biomass and CO2-C loss to wetting patterns are temperature dependent in a semi-arid soil.pdf
Published (Version of Record)CC BY V4.0, Open Access
Journal article
Response of microbial biomass and CO2-C loss to wetting patterns are temperature dependent in a semi-arid soil
Scientific Reports, Vol.7, Article number: 13032
2017
Abstract
One of the greatest contemporary challenges in terrestrial ecology is to determine the impact of climate change on the world’s ecosystems. Here we investigated how wetting patterns (frequency and intensity) and nutrient additions altered microbial biomass and CO2-C loss from a semi-arid soil. South-western Australia is predicted to experience declining annual rainfall but increased frequency of summer rainfall events when soil is fallow. Agricultural soils (0–10 cm at 10 °C or 25 °C) received the same total amount of water (15 mL over 30 days) applied at different frequency; with either nil or added nitrogen and phosphorus. Smaller more frequent wetting applications resulted in less CO2-C loss (P < 0.001); with cumulative CO2-C loss 35% lower than a single wetting event. This coincided with increased microbial biomass C at 25 °C but a decline at 10 °C. Increasing nutrient availability decreased CO2-C loss only under a single larger wetting event. While bacterial and fungal abundance remained unchanged, archaeal abundance and laccase-like copper monooxidase gene abundance increased with more frequent wetting at 25 °C. Our findings suggest smaller more frequent summer rainfall may decrease CO2 emissions compared to infrequent larger events; and enhance microbial C use efficiency where sufficient background soil organic matter and nutrients are available.
Details
- Title
- Response of microbial biomass and CO2-C loss to wetting patterns are temperature dependent in a semi-arid soil
- Authors/Creators
- Y. Rui (Author/Creator) - The University of Western AustraliaD.B. Gleeson (Author/Creator) - The University of Western AustraliaD.V. Murphy (Author/Creator) - The University of Western AustraliaF.C. Hoyle (Author/Creator) - The University of Western Australia
- Publication Details
- Scientific Reports, Vol.7, Article number: 13032
- Publisher
- Nature Research
- Identifiers
- 991005543396607891
- Copyright
- © The Author(s) 2017
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.112 Soil Carbon Dynamics
- Web Of Science research areas
- Soil Science
- ESI research areas
- Agricultural Sciences