OPENAIRE OpenAire Datacite Sygma Bielefeld Academic Search Engine (BASE) GEO-LEO e-docs MPG.PuRe Crossref Microsoft Academic Graph Europe PubMed Central eScholarship - University of California UnpayWall Fachrepositorium Lebenswissenschaften Research Collection PubMed Central European Union Open Data Portal https://link.springer.com/content/pdf/10.1007/s10533-021-00838-z.pdf https://escholarship.org/content/qt2nv780zp/qt2nv780zp.pdf https://doi.org/10.1007/s10533-021-00838-z Biogeochemistry Open Access 2021-08-27 2021-01-01 Abstract<p>Managed grasslands have the potential to store carbon (C) and partially mitigate climate change. However, it remains difficult to predict potential C storage under a given soil or management practice. To study C storage dynamics due to long-term (1952￢ﾀﾓ2009) phosphorus (P) fertilizer and irrigation treatments in New Zealand grasslands, we measured radiocarbon (14C) in archived soil along with observed changes in C stocks to constrain a compartmental soil model. Productivity increases from P application and irrigation in these trials resulted in very similar C accumulation rates between 1959 and 2009. The ￢ﾈﾆ14C changes over the same time period were similar in plots that were both irrigated and fertilized, and only differed in a non-irrigated fertilized plot. Model results indicated that decomposition rates of fast cycling C (0.1 to 0.2ￂﾠyear￢ﾈﾒ1) increased to nearly offset increases in inputs. With increasing P fertilization, decomposition rates also increased in the slow pool (0.005 to 0.008ￂﾠyear￢ﾈﾒ1). Our findings show sustained, significant (i.e. greater than 4 per mille) increases in C stocks regardless of treatment or inputs. As the majority of fresh inputs remain in the soil for less than 10ￂﾠyears, these long term increases reflect dynamics of the slow pool. Additionally, frequent irrigation was associated with reduced stocks and increased decomposition of fresh plant material. Rates of C gain and decay highlight trade-offs between productivity, nutrient availability, and soil C sequestration as a climate change mitigation strategy.</p Soil modeling Carbon sequestration 2. Zero hunger Environmental management Life on Land Environmental Science and Management Agronomy & Agriculture 04 agricultural and veterinary sciences 15. Life on land ddc:631.4 Soil carbon Article Radiocarbon Environmental Management Geochemistry Transit time 13. Climate action Earth Sciences Radiocarbon; Soil carbon; Soil modeling; Carbon sequestration; Transit time; SoilR 0401 agriculture, forestry, and fisheries SoilR Soil modeling ; Article ; Soil carbon ; Carbon sequestration ; SoilR ; Transit time ; Radiocarbon Other Chemical Sciences Environmental Sciences Stoner, Shane W., Hoyt, Alison M., Trumbore, Susan, Sierra, Carlos A., Schrumpf, Marion, Doetterl, Sebastian, Baisden, W. Troy, Schipper, Louis A., Stoner, Shane W.; Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland, Hoyt, Alison M.; Lawrence Berkeley National Laboratory, Berkeley, USA, Trumbore, Susan; Max Planck Institute for Biogeochemistry, Jena, Germany, Sierra, Carlos A.; Max Planck Institute for Biogeochemistry, Jena, Germany, Schrumpf, Marion; Max Planck Institute for Biogeochemistry, Jena, Germany, Doetterl, Sebastian; Department of Environmental Systems Science, ETH Zürich, Zurich, Switzerland, Baisden, W. Troy; Te Pūnaha Matatini Centre of Research Excellence, Auckland, New Zealand, Schipper, Louis A.; Environmental Research Institute, University of Waikato, Hamilton, New Zealand, 2021-08-27 journalpaper Abstract<p>Managed grasslands have the potential to store carbon (C) and partially mitigate climate change. However, it remains difficult to predict potential C storage under a given soil or management practice. To study C storage dynamics due to long-term (1952￢ﾀﾓ2009) phosphorus (P) fertilizer and irrigation treatments in New Zealand grasslands, we measured radiocarbon (14C) in archived soil along with observed changes in C stocks to constrain a compartmental soil model. Productivity increases from P application and irrigation in these trials resulted in very similar C accumulation rates between 1959 and 2009. The ￢ﾈﾆ14C changes over the same time period were similar in plots that were both irrigated and fertilized, and only differed in a non-irrigated fertilized plot. Model results indicated that decomposition rates of fast cycling C (0.1 to 0.2ￂﾠyear￢ﾈﾒ1) increased to nearly offset increases in inputs. With increasing P fertilization, decomposition rates also increased in the slow pool (0.005 to 0.008ￂﾠyear￢ﾈﾒ1). Our findings show sustained, significant (i.e. greater than 4 per mille) increases in C stocks regardless of treatment or inputs. As the majority of fresh inputs remain in the soil for less than 10ￂﾠyears, these long term increases reflect dynamics of the slow pool. Additionally, frequent irrigation was associated with reduced stocks and increased decomposition of fresh plant material. Rates of C gain and decay highlight trade-offs between productivity, nutrient availability, and soil C sequestration as a climate change mitigation strategy.</p Soil organic matter turnover rates increase to match increased inputs in grazed grasslands 10.1007/s10533-021-00838-z 695101