scholarly journals Predicting export of dissolved organic carbon from forested catchments in glaciated landscapes with shallow soils

2008 ◽  
Vol 22 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
I. F. Creed ◽  
F. D. Beall ◽  
T. A. Clair ◽  
P. J. Dillon ◽  
R. H. Hesslein
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Forested Catchments ◽  
Shallow Soils

Influences of dissolved organic carbon on stream water chemistry in two forested catchments in central Sweden

2010 ◽  
Vol 101 (1-3) ◽  
pp. 229-241 ◽  
Author(s):  
Sara H. Norström ◽  
Jenny L. K. Vestin ◽  
Dan Bylund ◽  
Ulla S. Lundström
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Water Chemistry ◽  
Stream Water ◽  
Forested Catchments ◽  
Stream Water Chemistry

scholarly journals Spring coherence in dissolved organic carbon export dominates total coherence in Boreal Shield forested catchments

2021 ◽  
Author(s):  
Matt Q Morison ◽  
Scott N Higgins ◽  
Kara Webster ◽  
Erik Emilson ◽  
Huaxia Yao ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Environmental Science ◽  
Carbon Sink ◽  
Regional Scale ◽  
Watershed Scale ◽  
Forested Catchments ◽  
Experimental Lakes Area ◽  
Changing Climate ◽  
Wide Range

Abstract The wide range of forested landscapes in boreal environments store and cycle substantial amounts of carbon, although the capacity of these systems to act as either a carbon sink or source is uncertain under a changing climate. While there are clear reports of regional-scale increases in dissolved organic carbon (DOC) concentrations in streams and lakes, there remains substantial watershed-scale variability in these patterns. Coherence is a framework for examining if variables of interest within adjacent spatial units change synchronously or asynchronously through time and has been widely applied in the context of lentic hydrochemistry, and which can shed light on the relative importance of regional- vs. local-scale controls. The objective of this research was to quantify coherence in discharge, DOC concentrations, and DOC loads in forested boreal watersheds, and to what extent coherence varied by season. Coherence was assessed using data from three long-term ecological research sites spanning boreal forest environments (IISD-Experimental Lakes Area, Turkey Lakes Watershed Study, and Dorset Environmental Science Centre) that included 29,829 DOC measurements across 739 stream-years, examining correlation between stream-pairs within each site, but not between sites. Seasonal coherence in DOC export was consistent across the three sites; coherence was significantly greater in spring than all other seasons, and was strongly related to discharge coherence. Currently, the season with the greatest loads (spring) is also the most coherent season, suggesting that annual between-stream coherence may be reduced if spring becomes proportionally less important in hydrologic budgets under a changing climate. This research aids in determining which factors contribute to synchronous watershed behaviour, and which factors may contribute to the timing and extent of individual watershed-scale deviations from landscape-level patterns.

scholarly journals Modeling the mechanisms that control in-stream dissolved organic carbon dynamics in upland and forested catchments

2007 ◽  
Vol 43 (2) ◽  
Author(s):  
M. N. Futter ◽  
D. Butterfield ◽  
B. J. Cosby ◽  
P. J. Dillon ◽  
A. J. Wade ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Dynamics ◽  
Forested Catchments

CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Markus Heryanto Langsa
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Total Organic Carbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Pinus Radiate

<p>Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (<em>wandoo eucalyptus </em>and <em>pinus radiate, conifer</em>) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).</p><p>Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV<sub>254</sub> disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.</p>

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