DES Seminar by Nirmala Liyanage (PhD candidate)

31 October 2014

Scale-dependent nature of variation of soil carbon, moisture and nitrogen in a forested sub-catchment.


`Scale' is a term extensively used in many environmental-related sciences which refers to the spatial, temporal and hierarchical dimension of a phenomenon. The scale-dependent nature of the variation of soil processes and properties is a well-known phenomenon among soil and environmental scientists. Soil variation cannot be avoided therefore it is necessary to understand the dominant spatial scales of variation and focus our modelling and sampling efforts at these scales. Studies on the scale-dependent nature of variation are rare in the soil or soil moisture literature. Many of those studies measured the scale-dependent nature as a one-off evaluation and assumed that the scale-dependency is stationary for many soil properties. However this assumption can be criticised due to the dynamic nature of soil moisture in the landscape in a daily basis and its role as a driver to many soil variables. It is said that nested designs and related analysis are more suitable for studying scale-dependency as it facilitates the analysis of multiple disparate scales with fewer sampling points as compared to grid or transect sampling. The objectives of this research are to identify the dominant scales of variation for soil carbon, nitrogen and moisture and their drivers and to study the time course of scale-dependency of soil moisture in a eucalyptus forest using a nested design with the hypothesis that the variation is scale-dependent.

All welcome to attend.

Time: 3-4PM (Note different time than usual)

Location: Room 422, Biomedical Building (C81), ATP

Contact: Dr Uta Stockmann

Phone: 02 8627 1147

Email: 201b1b77261a2410051f253619010b0f563e094f614a3d411d0441