Advances lowards Quantitative Assessments of Soil Profile Properties

摘要

In this paper, we present some advances in digital soil morphometries techniques in New Zealand. A soil monolith extractor has been developed in house and facilitates the application of digital soil morphometries techniques. Three distinct soil profiles have been sampled using the monolith extractor to test new ways to collect information from the soil profile. Digital images have been collected on these soil monoliths and calibrated using a set of reference colour chips. The spectral resolution of these images has been enhanced by combining the spatial resolution of the CCD images (1 mm) with the spectral resolution and range of an ASD FieldSpec 3 visible-NTR spectrometer (1 nm between 350 and 2500 nm). A processing chain combining image processingmethods such as principal component (PC) analysis and image segmentation has been developed to support the delineation of soil horizons and collect information about the soil structure.