Our findings indicate the importance of paleoclimatic information to improve quantitative predictions of global soil C stocks.
Identifying the global drivers of soil priming is essential to understanding C cycling in terrestrial ecosystems. We conducted a survey of soils across 86 globally-distributed locations, spanning a wide range of climates, biotic communities, and soil conditions, and evaluated the apparent soil priming effect using13C-glucose labeling. Here we show that the magnitude of the positive apparent priming effect (increase in CO2release through accelerated microbial biomass turnover) was negatively associated with SOC content and microbial respiration rates. Our statistical modeling suggests that apparent priming effects tend to be negative in more mesic sites associated with higher SOC contents. In contrast, a single-input of labile C causes positive apparent priming effects in more arid locations with low SOC contents. Our results provide solid evidence that SOC content plays a critical role in regulating apparent priming effects, with important implications for the improvement of C cycling models under global change scenarios. Our findings indicate the importance of paleoclimatic information to improve quantitative predictions of global soil C stocks.
Receptors that distinguish the multitude of microbes surrounding plants in the environment enable dynamic responses to the biotic and abiotic conditions encountered. In this study, we identify and characterise a glycan receptor kinase, EPR3a, closely related to the exopolysaccharide receptor EPR3. Epr3a is up-regulated in roots colonised by arbuscular mycorrhizal (AM) fungi and is able to bind glucans with a branching pattern characteristic of surface-exposed fungal glucans. Expression studies with cellular resolution show localised activation of the Epr3a promoter in cortical root cells containing arbuscules. Fungal infection and intracellular arbuscule formation are reduced in epr3a mutants. In vitro, the EPR3a ectodomain binds cell wall glucans in affinity gel electrophoresis assays. In microscale thermophoresis (MST) assays, rhizobial exopolysaccharide binding is detected with affinities comparable to those observed for EPR3, and both EPR3a and EPR3 bind a well-defined \uffce\uffb2-1,3/\uffce\uffb2-1,6 decasaccharide derived from exopolysaccharides of endophytic and pathogenic fungi. Both EPR3a and EPR3 function in the intracellular accommodation of microbes. However, contrasting expression patterns and divergent ligand affinities result in distinct functions in AM colonisation and rhizobial infection in Lotus japonicus. The presence of Epr3a and Epr3 genes in both eudicot and monocot plant genomes suggest a conserved function of these receptor kinases in glycan perception.Low\uffe2\uff80\uff90temperature pyrolysis of biomass produces a product known as biochar The incorporation of this material into the soil has been advocated as a C sequestration method. Biochar also has the potential to influence the soil N cycle by altering nitrification rates and by adsorbing or NH3 Biochar can be incorporated into the soil during renovation of intensively managed pasture soils. These managed pastures are a significant source of N2O, a greenhouse gas, produced in ruminant urine patches. We hypothesized that biochar effects on the N cycle could reduce the soil inorganic\uffe2\uff80\uff90N pool available for N2O\uffe2\uff80\uff90producing mechanisms. A laboratory study was performed to examine the effect of biochar incorporation into soil (20 Mg ha\uffe2\uff88\uff921) on N2O\uffe2\uff80\uff90N and NH3\uffe2\uff80\uff93N fluxes, and inorganic\uffe2\uff80\uff90N transformations, following the application of bovine urine (760 kg N ha\uffe2\uff88\uff921). Treatments included controls (soil only and soil plus biochar), and two urine treatments (soil plus urine and soil plus biochar plus urine). Fluxes of N2O from the biochar plus urine treatment were generally higher than from urine alone during the first 30 d, but after 50 d there was no significant difference (P = 0.11) in terms of cumulative N2O\uffe2\uff80\uff90N emitted as a percentage of the urine N applied during the 53\uffe2\uff80\uff90d period; however, NH3\uffe2\uff80\uff93N fluxes were enhanced by approximately 3% of the N applied in the biochar plus urine treatment compared with the urine\uffe2\uff80\uff90only treatment after 17 d. Soil inorganic\uffe2\uff80\uff90N pools differed between treatments, with higher concentrations in the presence of biochar, indicative of lower rates of nitrification. The inorganic\uffe2\uff80\uff90N pool available for N2O\uffe2\uff80\uff90producing mechanisms was not reduced, however, by adding biochar.
", "keywords": ["2. Zero hunger", "bovine urine", "550", "ANZSRC::31 Biological sciences", "soil nitrogen", "ANZSRC::30 Agricultural", "04 agricultural and veterinary sciences", "15. Life on land", "630", "6. Clean water", "veterinary and food sciences", "Marsden::300103 Soil chemistry", "13. Climate action", "ANZSRC::41 Environmental sciences", "0401 agriculture", " forestry", " and fisheries", "biochar"]}, "links": [{"href": "https://doi.org/10.2136/sssaj2009.0185"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Science%20Society%20of%20America%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2136/sssaj2009.0185", "name": "item", "description": "10.2136/sssaj2009.0185", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2136/sssaj2009.0185"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-05-01T00:00:00Z"}}, {"id": "1959.4/unsworks_64930", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-24T16:26:11Z", "type": "Journal Article", "created": "2017-04-14", "title": "Climate legacies drive global soil carbon stocks in terrestrial ecosystems", "description": "Our findings indicate the importance of paleoclimatic information to improve quantitative predictions of global soil C stocks.
Receptors that distinguish the multitude of microbes surrounding plants in the environment enable dynamic responses to the biotic and abiotic conditions encountered. In this study, we identify and characterise a glycan receptor kinase, EPR3a, closely related to the exopolysaccharide receptor EPR3. Epr3a is up-regulated in roots colonised by arbuscular mycorrhizal (AM) fungi and is able to bind glucans with a branching pattern characteristic of surface-exposed fungal glucans. Expression studies with cellular resolution show localised activation of the Epr3a promoter in cortical root cells containing arbuscules. Fungal infection and intracellular arbuscule formation are reduced in epr3a mutants. In vitro, the EPR3a ectodomain binds cell wall glucans in affinity gel electrophoresis assays. In microscale thermophoresis (MST) assays, rhizobial exopolysaccharide binding is detected with affinities comparable to those observed for EPR3, and both EPR3a and EPR3 bind a well-defined \uffce\uffb2-1,3/\uffce\uffb2-1,6 decasaccharide derived from exopolysaccharides of endophytic and pathogenic fungi. Both EPR3a and EPR3 function in the intracellular accommodation of microbes. However, contrasting expression patterns and divergent ligand affinities result in distinct functions in AM colonisation and rhizobial infection in Lotus japonicus. The presence of Epr3a and Epr3 genes in both eudicot and monocot plant genomes suggest a conserved function of these receptor kinases in glycan perception.Identifying the global drivers of soil priming is essential to understanding C cycling in terrestrial ecosystems. We conducted a survey of soils across 86 globally-distributed locations, spanning a wide range of climates, biotic communities, and soil conditions, and evaluated the apparent soil priming effect using13C-glucose labeling. Here we show that the magnitude of the positive apparent priming effect (increase in CO2release through accelerated microbial biomass turnover) was negatively associated with SOC content and microbial respiration rates. Our statistical modeling suggests that apparent priming effects tend to be negative in more mesic sites associated with higher SOC contents. In contrast, a single-input of labile C causes positive apparent priming effects in more arid locations with low SOC contents. Our results provide solid evidence that SOC content plays a critical role in regulating apparent priming effects, with important implications for the improvement of C cycling models under global change scenarios.