Abstract
Aims
Drying and rewetting (DRW) often increases soil phosphorus (P) availability. Our aims were to elucidate underlying processes and assess potential plant uptake of released P.
Methods
Using a grassland soil with low available and high microbial P as a model, we studied the contributions of microbial and physicochemical processes to P release by determining DRW effects on i) C:P ratios of nutrient pulses in fresh and sterilized soils, ii) aggregate stability and iii) P forms released upon soil dispersion. Use of the P pulse by maize was examined in a bioassay and a split-root experiment.
Results
The strong P pulse after DRW was larger than that observed for C. Experiments with sterilized soil pointed to a non-microbial contribution to the pulse for P, but not for C. Aggregate disruption after DRW occurred due to slaking, and this released molybdate-reactive and -unreactive P. Maize benefitted from the P pulse only in the bioassay, i.e. when planted after the DRW cycle.
Conclusions
The majority of C and P released upon DRW originated from the microbial biomass, but for P release, physicochemical processes were also important. In the field, the released P would only be available to drought-resistant plants.
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Discover the latest articles, news and stories from top researchers in related subjects.Abbreviations
- DRW:
-
Drying and rewetting
- P:
-
Phosphorus
- Corg :
-
Organic carbon
- Ntot :
-
Total nitrogen
- GWC:
-
Gravimetric water content
- Presin :
-
Resin-extractable P
- Phex :
-
Hexanol-labile P
- CK2SO4 :
-
Organic C extractable with 0.5 M K2SO4
- Cchl :
-
Chloroform-labile C
- MRP:
-
Molybdate-reactive P
- MUP:
-
Molybdate-unreactive P
- MWD:
-
Mean weight diameter
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Acknowledgments
We would like to thank Olivier Huguenin-Elie (ART Reckenholz) for access to the field site, Django Hegglin and Simon Degelo for assistance during soil sampling and preparation, and Thomas Flura, Angela Erb and Fred Lamy for technical help in the lab.
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Bünemann, E.K., Keller, B., Hoop, D. et al. Increased availability of phosphorus after drying and rewetting of a grassland soil: processes and plant use. Plant Soil 370, 511–526 (2013). https://doi.org/10.1007/s11104-013-1651-y
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DOI: https://doi.org/10.1007/s11104-013-1651-y