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https://hdl.handle.net/1959.11/27132
Title: | Flooding and prolonged drought have differential legacy impacts on soil nitrogen cycling, microbial communities and plant productivity | Contributor(s): | Nguyen, Linh T T (author); Osanai, Yui (author) ; Anderson, Ian C (author); Bange, Michael P (author); Tissue, David T (author); Singh, Brajesh K (author) | Publication Date: | 2018-10 | Early Online Version: | 2018-08-11 | DOI: | 10.1007/s11104-018-3774-7 | Handle Link: | https://hdl.handle.net/1959.11/27132 | Abstract: | Background and aims: Extreme climate events, including flooding and prolonged drought, may establish long-lasting (legacy) effects on soil abiotic and biotic properties, potentially influencing soil N-cycling, microbial communities, and plant productivity. Nitrogen (N) fertilizer often stimulates plant growth, but it remains unknown whether N addition can alleviate the impact of legacy drought or waterlogging events on crops. Our aim was to assess the interactive effects of legacy extreme climate events and N-addition on these processes. Methods: Using cotton as a model system, soils previously exposed to waterlogging and prolonged drought were used to examine potential legacy impacts of extreme climate on soil N process rates, abundance and structure of associated microbial communities, and cotton growth and productivity under different levels of N fertilizer application (0, 100, 200 and 300 kg N/ha). Results: The deleterious legacy effects of prolonged drought on plant productivity were due to negative impacts on microbial abundance and community structure, and soil nutrient availability, thereby negatively influencing the rate of nitrification, and consequently plant available N. The legacy impacts of prolonged drought persisted throughout the experiment despite fertiliser applications of up to 300 kg of N/ha. The only observed legacy impacts of waterlogging were low NO₃- levels in soils without N-addition and shifts in the abundance and structure of the N₂O-reducing community. Conclusions: There were strong legacy impacts of prolonged drought, but minor legacy impacts of waterlogging, on soils and crop yields which could not be fully counteracted by the high rates of N fertilizer application. This study provides critical knowledge contributing to the development of adaptation and soil N management strategies to minimize the loss of farm productivity, within the context of increased frequencies and intensities of extreme weather events. | Publication Type: | Journal Article | Grant Details: | ARC/DP170104634 | Source of Publication: | Plant and Soil, 431(1-2), p. 371-387 | Publisher: | Springer Netherlands | Place of Publication: | Netherlands | ISSN: | 1573-5036 0032-079X |
Fields of Research (FoR) 2008: | 060504 Microbial Ecology 069902 Global Change Biology 070108 Sustainable Agricultural Development |
Fields of Research (FoR) 2020: | 310703 Microbial ecology 319902 Global change biology 300210 Sustainable agricultural development |
Socio-Economic Objective (SEO) 2008: | 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts) 820301 Cotton 960305 Ecosystem Adaptation to Climate Change |
Socio-Economic Objective (SEO) 2020: | 190504 Effects of climate change on Australia (excl. social impacts) 260602 Cotton 190102 Ecosystem adaptation to climate change |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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