Relationships between Organic Matter and Bulk Density in Amazonian Peatland Soils

Brian Crnobrna, Irbin B. Llanqui (), Anthony Diaz Cardenas and Grober Panduro Pisco
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Brian Crnobrna: Facultad de Ciencias Forestales y Ambientales, Universidad Nacional de Ucayali, Carr. Federico Basadre km 6, Pucallpa 25004, Peru
Irbin B. Llanqui: Escuela de Ciencias Biologicas, Universidad Nacional Mayor de San Marcos, Av. Venezuela s/n, Lima 15081, Peru
Anthony Diaz Cardenas: Facultad de Ciencias Forestales y Ambientales, Universidad Nacional de Ucayali, Carr. Federico Basadre km 6, Pucallpa 25004, Peru
Grober Panduro Pisco: Facultad de Ciencias Forestales y Ambientales, Universidad Nacional de Ucayali, Carr. Federico Basadre km 6, Pucallpa 25004, Peru

Sustainability, 2022, vol. 14, issue 19, 1-14

Abstract: The carbon pool of Amazonian peatlands is immense and mediates critical ecological functions. As peatlands are dynamic, similar to other wetland systems, modeling of the relationship between organic matter and dry bulk density allows the estimation of the accumulation and/or decomposition of peats. We tested several models: the generalized linear mixed logarithmic, to test depth, and the non-linear logarithmic and power-law models. There is a negative power-law relationship between organic percentage and dry bulk density using peat samples collected in Amazonian peatlands ( n = 80). This model is supported by the coefficient of determination ( R 2 ) estimates garnered from model fitting, while Akaike Information Criterion (AIC) values further support parsimonious models. We also ran trials of the ideal mixing model with two parameters: k1 representing organic density and k2 representing mineral. The mixture of organic and inorganic components generally falls in accordance with the theory that decreasing k1 trends with increasing k2, although k2 values for these peat samples are negative. The organic k1 coefficient allows us to identify two sites out of the nine investigated, which can be prioritized for their carbon dynamics. The presence of high-density samples, which were not related to depth, indicates clay intrusion in these peatlands. We hope the modeling can explain processes significant to these globally important carbon-rich ecosystems.

Keywords: loss on ignition; tropical peat; Peruvian Amazon; accretion; soil carbon; clay intrusion (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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