At the Annual UK – China CZO programme meeting in Guiyang, China in June 2017 the Red Soil project presented an update of how work was going to that point in time, 18 months into the project. The bullet points below summaries this presentation.
Red Soil CZ: From Natural to Anthropogenic Evolution of Red Soil and its Impact on Ecosystem Function in the Critical Zone– Prof Paul Hallett and Prof Ganlin Zhang
- Morphological, biogeochemical and biological indicators have characterized the structure of the Red Soil CZ.
- Land cover and management have a large influence on soil processes and evolution. Large proportion of rainfall driving nitrogen into groundwater then surface water (>500 mm/year)
- Rainfall recharges soil water frequently, but replaces the 0-100 cm “old water” completely within about 2-3 months in wet season.
- Soil erosion rate up to 3500 ton km-2 yr-1. SOC stock and erosion interactions being modelled to determine sink vs. source.
- The CO2 assimilation coupled with Fe(II) oxidation was experimentally proved.
- Models allowing for ecosystem processes and hydrology to be predicted at plot scale, with extension to larger scales underway.
- What’s next?
- Integration of models and data;
- Nitrogen transformation and translocation (e.g. acidification, movement to environment);
- Fe-C interactions with aggregation;
- Separate upland and paddy ecosystems for hydrological modelling;
- Use modelling output to inform policy decisions.