Stabilization of dissolved organic matter by sorption to the mineral soil

来自 dx.doi.org

喜欢 0

阅读量：

320

作者：

K Kalbitz，D Schwesig，J Rethemeyer，E Matzner

展开

摘要：

The main process by which dissolved organic matter (DOM) is retained in forest soils is likely to be sorption in the mineral horizons that adds to stabilized organic matter (OM) pools. The objectives of this study were to determine the extent of degradation of sorbed OM and to investigate changes in its composition during degradation. DOM of different origins was sorbed to a subsoil and incubated for 1 year. We quantified mineralized C by frequent CO2 measurements in the headspace of the incubation vessels and calculated mean residence times by a double exponential model. Mineralization of C of the corresponding DOM in solution was used as a control to estimate the extent of DOM stabilization by sorption. Changes in the composition of sorbed OM during the incubation were studied by spectroscopic (UV, fluorescence) and isotope (13C, 14C) measurements after hot-water extraction of OM.

展开

关键词：

13C 14C Dissolved organic matter Fluorescence spectroscopy Hot-water extraction Mineralization Sorption Stabilization UV/VIS spectroscopy