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A Plant ecology approach to digital soil mapping, improving the prediction of soil organic carbon content in alpine grasslands

Ballabio, Cristiano and Fava, Francesco and Rosenmund, Alexandra (2012) A Plant ecology approach to digital soil mapping, improving the prediction of soil organic carbon content in alpine grasslands. Geoderma, Vol. 187–188 , p. 102-116. ISSN 0016-7061. Article.

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DOI: 10.1016/j.geoderma.2012.04.002

Abstract

The influence of organisms on pedogenesis is acknowledged in the scorpan model; however organisms, plants in particular, might be seen in a different light within the scorpan model. In fact, in minimally managed terrestrial ecosystems, biota coexists with soil as part of a feedback system, in which the biota not only influences soil development, but is also in turn influenced by it. This means that in natural environments a particular soil is usually associated with a typical combination of plant species which thrive in the biotope defined by the soil physical and chemical properties. Changes in soil features will favor certain species over others, thus modifying the structure of the resident plant communities. This makes plant communities very effective proxies of soil properties, effectively acting as widespread biological sensors.
In this paper we will show how plant communities can be utilized to improve the quality of digital soil maps, effectively reducing the amount of field work needed by soil surveys, through a combination of relatively swifter and cheaper vegetation surveys and remote sensing data.
The approach we propose is based on the spectral and textural properties of plant communities which can be summarized from high resolution remotely sensed images and LIDAR data through the use of geostatistical, spectral and geomorphometric descriptors. These descriptors are then associated with the scores obtained from the ordination of the plant communities' relative coverage. Ordination projects the high dimensional plant cover data into a lesser dimensional space, thus making easier to establish a relation between ecological space and geostatistical descriptors. Once established this relation can be exploited through the use of regression techniques in a regression kriging framework.
In this case study, we applied the proposed model to the prediction of soil organic carbon content in an alpine grassland. The use of plant communities cover almost doubled the predictive power of the model from an R2 of 0.32 to an R2 of 0.66 in cross-validation, a result which strongly advocates for the efficiency of the proposed approach.

Item Type:Article
ID Code:8683
Status:Published
Refereed:Yes
Uncontrolled Keywords:Digital soil mapping, plant community ecology, correspondence analysis, image texture, variogram, soil organic carbon
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/14 Pedologia
Divisions:001 Università di Sassari > 02 Centri > Centro interdipartimentale Nucleo di ricerca sulla desertificazione
Publisher:Elsevier Science
ISSN:0016-7061
Deposited On:22 Feb 2013 14:43

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