Liebig’s law of the minimum applied to a greenhouse gas: alleviation of P-limitation reduces soil N2O emission
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Background and aims
Emission of the greenhouse gas (GHG) nitrous oxide (N2O) are strongly affected by nitrogen (N) fertilizer application rates. However, the role of other nutrients through stoichiometric relations with N has hardly been studied. We tested whether phosphorus (P) availability affects N2O emission. We hypothesized that alleviation of plant P-limitation reduces N2O emission through lowering soil mineral N concentrations.
We tested our hypothesis in a pot experiment with maize (Zea mays L.) growing on a P-limiting soil/sand mixture. Treatment factors included P and N fertilization and inoculation with Arbuscular Mycorrhizal Fungi (AMF; which can increase P uptake).
Both N and P fertilization, as well as their interaction significantly (P < 0.01) affected N2O emission. Highest N2O emissions (2.38 kg N2O-N ha−1) were measured at highest N application rates without P fertilization or AMF. At the highest N application rate, N2O fluxes were lowest (0.71 kg N2O-N ha−1) with both P fertilization and AMF. The N2O emission factors decreased with 50 % when P fertilization was applied.
Our results illustrate the importance of the judicious use of all nutrients to minimize N2O emission, and thereby further underline the intimate link between sound agronomic practice and prudent soil GHG management.
KeywordsNitrous oxide AMF Phosphorus Emission factor N uptake Stoichiometry
We thank Willem Menkveld, Gerlinde Vink, Tamas Salanki and Jaap Nelemans for their assistance with laboratory work. Comments by Lijbert Brussaard on a previous version of this manuscript are much appreciated. We are also grateful for the comments of two anonymous reviewers. Jan Willem van Groenigen was supported by a personal Vidi grant from the Dutch Science Foundation (NWO-ALW).
- Bolan NS (1991) A critical review on the role of mycorrhizal fungi in the uptake of phosphorus by plants. Plant Soil 134:187–20763Google Scholar
- Brundrett M, Boucher N, Dell B, Grove T, Malajczuk N (1996) Working with mycorrhiza in forest and agriculture. CSIRO Publisher, CanberraGoogle Scholar
- FAOSTAT (2008) Food and Agricultural Organisation statistics database. Food and Agricultural Organisation of the United Nations, RomeGoogle Scholar
- IFA/FAO (2008) Global Estimates of Gaseous Emissions of NH3, NO, and N2O from agricultural land. International Fertilizer Industry Association and Food and Agricultural Organisation of the United Nations, RomeGoogle Scholar
- Merbach W, Augustin J, Gans W (2001) Nitrous oxide emission from fen mires in dependence of anthropogenic activities. J Appl Bot 75:118–123133Google Scholar
- Solomon S, Qin D, Manning M, et al (2007) Technical summary. In: Solomon S, Qin D, Manning M et al (eds) Climate change 2007: the physical science basis, Contribution of Working Group I to the Fourth Assestment Report of the Intergovernmental Panel on Climate Change. Cambridge, UKGoogle Scholar
- Trujillo-Tapia N, Cruz Mondragón C, Vásquez-Murrieta MS, Van Cleemput O, Dendooven L (2008) Inorganic N dynamics and N2O production from tannery effluents irrigated soil under different water regimes and fertilizer application rates: a laboratory study. Appl Soil Ecol 38:279–288134CrossRefGoogle Scholar