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Soil carbon and nitrogen cycling in ...

Carrasco, Jonathan Joseph.

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Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment./
Author:	Carrasco, Jonathan Joseph.
Description:	109 p.
Notes:	Adviser: Carol Wessman.
Contained By:	Dissertation Abstracts International67-02B.
Subject:	Agriculture, Soil Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3207722
ISBN:	9780542554681

Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment.
Carrasco, Jonathan Joseph.

Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment. - 109 p.

Adviser: Carol Wessman.

Thesis (Ph.D.)--University of Colorado at Boulder, 2006.

Anthropogenic nitrogen deposition has the potential to alter forest soil carbon (C) and nitrogen (N) cycling, but to what extent different forest types are impacted is unclear. To address this, I studied the C and N cycling in forests of the Colorado Front Range, where ambient N deposition has been as high as 5-6 kg N ha-1 yr-1. Due to differences in the soil C:N ratio and anticipated differences in N cycling, I chose an aspen and a lodgepole pine forest and amended plots with 25 kg N ha -1 yr-1.

ISBN: 9780542554681Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment.
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008 110915s2006 eng d
020 $a 9780542554681
035 $a (UMI)AAI3207722
035 $a AAI3207722
040 $a UMI $c UMI
100 1 $a Carrasco, Jonathan Joseph. $3 1291212
245 1 0 $a Soil carbon and nitrogen cycling in contrasting forests of the Colorado Front Range: Inherent controls and response to nitrogen amendment.
300 $a 109 p.
500 $a Adviser: Carol Wessman.
500 $a Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 0759.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2006.
520 $a Anthropogenic nitrogen deposition has the potential to alter forest soil carbon (C) and nitrogen (N) cycling, but to what extent different forest types are impacted is unclear. To address this, I studied the C and N cycling in forests of the Colorado Front Range, where ambient N deposition has been as high as 5-6 kg N ha-1 yr-1. Due to differences in the soil C:N ratio and anticipated differences in N cycling, I chose an aspen and a lodgepole pine forest and amended plots with 25 kg N ha -1 yr-1.
520 $a Following snowmelt, dissolved organic C (DOC) was greatest in the lodgepole pine soil, resulting in a DOC:DON ratio twice as great as the aspen. Nitrogen amendment decreased the DOC:DON ratio and increased the NO3 - concentration in the lodgepole pine soil from 26 mug NO3 -N L-1 to 346 mug NO3-N L-1. Nitrogen retention was high in both forests indicating a large capacity for retention of deposited N.
520 $a Surface soil incubations showed that the more lignin-rich, high C:N ratio lodgepole pine soil was more labile than the aspen soil. Apparently, the lower lignin content and lower C:N ratio soil in the aspen forest did not equate with a more labile soil organic matter (SOM). Nitrogen amendment did increase the CO2-C flux across both forests suggesting that decomposition was N limited in both forests, thus indicating a potential for increased CO 2-C flux from heterogeneous landscapes following N deposition.
520 $a Stabilization of mineral soil C and N was found to be much greater in the aspen soil due to higher Fe and Al hydroxide content, which in turn resulted in higher DOC sorption and explains the lower DOC during snowmelt. The sorption of humic and non-humic DOC was altered in the N amended soils indicating a potential for stabilization to disrupt the sorption mechanism and change the soil solution chemistry.
520 $a Results demonstrate that the inherent cycling of C and N differs substantially in these forests and yet a modest N amendment was capable of changing C and N cycling in both forests. However, the lodgepole pine soil appears more susceptible to change following N amendment.
590 $a School code: 0051.
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Environmental Sciences. $3 676987
690 $a 0329
690 $a 0425
690 $a 0481
690 $a 0768
710 2 0 $a University of Colorado at Boulder. $3 1019435
773 0 $t Dissertation Abstracts International $g 67-02B.
790 $a 0051
790 1 0 $a Wessman, Carol, $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3207722