Relationships between Organic Matter and Bulk Density in Amazonian Peatland Soils

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 (R2) 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.

Distribution Characteristics and Main Influencing Factors of Organic Carbon in Sediments of Spartina Alterniflora Wetlands along the Northern Jiangsu Coast, China

“…In addition, with increasing depth, the amount of decomposition products of S. alterniflora roots and other withered organs gradually decreased, the organic matter content of the sediment decreased, the sediment structure became denser, and the BD increased. Furthermore, BD is associated with soil texture, and a decrease in clay content and an increase in sand content resulted in a higher BD [38,39].…”

A Multifunctional ‘Scape Approach for Sustainable Management of Intact Ecosystems—A Review of Tropical Peatlands

“…Secondly, regarding tropical peatlands, the paper draws heavily on case studies focused on southeast Asia. However, the authors are cognizant of examples emerging from other critical tropical peatland regions globally, such as the Congo Basin in west Africa [93,94] and lesser studied regions in Latin America, such as Peru [95]. As such, the paper's findings and preliminary recommendations have been structured with the potential exchange of learnings between academics, policymakers, and practitioners from different global regions in mind.…”