Journal article
High-frequency fire alters soil and plant chemistry but does not lead to nitrogen-limited growth of Eucalyptus pilularis seedlings
Plant and Soil, Vol.432(1-2), pp.191-205
2018
Abstract
Background and aims: Vegetation fire often raises levels of soil phosphorus (P) relative to those of nitrogen (N), while long-term fire exclusion is associated with accumulation of soil N and depletion of soil available P. Thus, high-frequency fire regimes might trigger N-limited plant growth in otherwise P-limited plant communities. Methods: We used soils from a long-term prescribed burning trial to grow Eucalyptus pilularis under several nutrient amendment conditions. We measured seedling growth, soil and plant chemistry, and root enzyme activities to assess nutrient status. Results: Biennially-burned (2yB) soils had higher labile P concentrations than long-unburned (NB) soils, and lower total and labile N:P ratios. This did not correspond to N-limited growth or stimulate seedling N demand. Seedlings grown with addition of N, P and micro-nutrients in combination (μMax treatment) attained 68% more biomass than unfertilised seedlings. Addition of P resulted in higher total biomass than addition of N, and similar biomass to the μMax treatment, suggesting partially P-limited growth. Plants grown in 2yB soils tended to be enriched with P, K, Ca and Mg compared to those grown in NB or 4yB soils. Conclusions: High-frequency prescribed burning depletes soil N relative to P, but this does not trigger a shift toward N-limited growth of E. pilularis seedlings. Instead, E. pilularis seedlings appear to grow under partial P-limitation which persists regardless of their soil's fire history.
Details
- Title
- High-frequency fire alters soil and plant chemistry but does not lead to nitrogen-limited growth of Eucalyptus pilularis seedlings
- Authors
- Orpheus M Butler (Author) - Griffith UniversityMehran Rezaei Rashti (Author) - Griffith UniversityTom Lewis (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringJames J Elser (Author) - University of Montana, United StatesChengrong Chen (Corresponding Author) - Griffith University
- Publication details
- Plant and Soil, Vol.432(1-2), pp.191-205
- Publisher
- Springer Netherlands
- Date published
- 2018
- DOI
- 10.1007/s11104-018-3797-0
- ISSN
- 0032-079X
- Organisation Unit
- University of the Sunshine Coast, Queensland; Forest Research Institute
- Language
- English
- Record Identifier
- 99451477002621
- Output Type
- Journal article
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- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Agronomy
- Plant Sciences
- Soil Science
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