Dados do Trabalho

Título

CLSOILMAPS: A NATIONAL SOIL GRIDDED PRODUCT FOR CHILE

Resumo

Spatially explicit soil information is crucial for comprehending and managing many of Earth´s processes, related to carbon, water, and other biogeochemical cycles. Gridded products of soil physical properties and hydropedological properties are now available for the entire world, typically at a resolution of 250m. However, these products for Chile are based on a limited set of local observations, which introduces potential uncertainties. To address this limitation, local digital soil maps have been developed, although they possess moderate precision and are not publicly accessible. These maps rely on observations collected primarily from agricultural lands located in flat areas with mild climatic conditions, which do not adequately represent the country's natural variability. Chile is characterized by a mountainous topography and experiences a range of harsh weather conditions, including extreme desert, rainy, and polar climates. We introduced a gridded database of soil physical properties and soil hydraulic parameters at a spatial resolution of approximately 100 meters. It covers the continental area of Chile and binational basins shared with Argentina, for six standardized depths following specifications of the GlobalSoilMap project. Maps were obtained from digital soil mapping techniques based on more than 4000 observations, including unpublished data from remote areas. These maps were used as input for the pedotransfer function Rosetta V3 to obtain predictions of soil hydraulic properties, such as field capacity, permanent wilting point, total available water capacity, and other parameters of the water retention curve. The trained models outperformed several other DSM studies applied at the national and regional scale for soil physical properties (nRMSE ranging from 6.93% to 15.7%) and delivered acceptable predictions (nRMSE ranging from 10.4% to 15.6%) for soil hydraulic properties, making them suitable for countless environmental studies.

Palavras-chave

digital soil mapping, soil hydraulic parameters, data base

Instituição financiadora

Chilean National Agency for Research and Development (Agencia Nacional de Investigación y Desarrollo de Chile, ANID) through projects FONDECYT 1210932, and 1212071, FONDAP 1522A0001, and ANID DO210001