Home
Science
I.T.
Arts

Fate Of Particulate And Dissolved Organic Matter In Soil N Mineralization  


Abstract Category: Science
Course / Degree: M.Sc (Soil Science)
Institution / University: Wageningen University, Netherlands
Published in: 2011


Thesis Abstract / Summary:

The transformation of insoluble organic N via particulate and dissolved organic matter (POM and DOM) into inorganic N may represent the bottle neck mechanism in N mineralization. However, it is unknown how POM fractions are related to DOM pools, and how these particulate and dissolved pools are quantitatively involved in N mineralization. To understand and quantify the fate of these pools in N mineralization, we conducted an incubation experiment with 15N labeled radish residues to trace the flow of 15N through the different N pools. POM was fractionated with density fractionation as light and heavy fraction (LF and HF). The dissolved organic matter fraction was collected using a centrifugal drainage technique and subsequently separated into a bioavailable and recalcitrant fraction.

The enrichment of 15N in POM, DON and inorganic N along with their concentrations were examined to identify their role in N mineralization. Our analysis showed that neither DON nor POM function as a distinct N source fraction in soil. The collected DOM was predominantly recalcitrant (~80%), suggesting that the bioavailable DOM fraction cannot be measured with current sampling techniques. The concentration of DOM strongly increases upon incorporation of crop residues, but diminish sharply within a few days. Our results also suggest that the DOM fraction is heterogeneous in composition; the most bioavailable part is consumed within a few days whereas the remaining part is fairly constant. Further research should focus on bioavailable fraction analysis.


Thesis Keywords/Search Tags:
Particulate organic matter, Dissolved organic matter, Dissolved organic nitrogen, Dissolved organic carbon, Bioavailable fraction, 15N enrichment

This Thesis Abstract may be cited as follows:
Baral, B. 2011. Fate of Particulate and Dissolved Organic Matter in N Mineralization. Wageningen University.


Submission Details: Thesis Abstract submitted by Bandhu Raj Baral from Netherlands on 16-Jun-2011 23:09.
Abstract has been viewed 3069 times (since 7 Mar 2010).

Bandhu Raj Baral Contact Details: Email: bandhu-baral@yahoo.com



Disclaimer
Great care has been taken to ensure that this information is correct, however ThesisAbstracts.com cannot accept responsibility for the contents of this Thesis abstract titled "Fate Of Particulate And Dissolved Organic Matter In Soil N Mineralization". This abstract has been submitted by Bandhu Raj Baral on 16-Jun-2011 23:09. You may report a problem using the contact form.
© Copyright 2003 - 2024 of ThesisAbstracts.com and respective owners.


Copyright © Thesis Abstract | Dissertation Abstracts Thesis Library 2003-2024.
by scope.com.mt @ website design