Burial and decomposition of particulate organic matter in a temperate, siliciclastic, seasonal wetland

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Title: Burial and decomposition of particulate organic matter in a temperate, siliciclastic, seasonal wetland
Author: Welsh, Lisa Williamson
Abstract: Understanding the role of freshwater wetlands in the global carbon cycle has become more important as evidence of climate change grows . In this paper , we examine the burial and decomposition of particulate organic matter (POM ) in a temperate , siliciclastic , seasonal wetland . High POM abundances are found in silt layers , while sand units preserve very little POM . The POM distribution with depth is compared to the biogeochemistry of sediment porewater with depth . POM acts as a driver for reduction reactions within the wetland soil . Porewater biogeochemistry and POM decomposition are controlled by seasonal changes in the level of the water table which cause seasonal shifts in the oxic /anoxic boundary . At the oxic /anoxic boundary , reoxidation of FeS minerals in the soil cause rapid POM decomposition at the average minimum water table level in the late summer and early fall . Variation in the minimum depth of the water table from year to year may account for fluctuating POM numbers in the upper silt layers . The results from this study can be used to predict seasonal water level fluctuations in ancient wetland and to explain recurrence horizons in peat .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1524
Date: 2009-05-15

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Burial and decomposition of particulate organic matter in a temperate, siliciclastic, seasonal wetland. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1524 .

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