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Characteristics of soil organic matt...

Crow, Susan E.

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Characteristics of soil organic matter in two forest soils.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Characteristics of soil organic matter in two forest soils./
作者:	Crow, Susan E.
面頁冊數:	145 p.
附註:	Adviser: Kate Lajtha.
Contained By:	Dissertation Abstracts International67-05B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3219755
ISBN:	9780542712500

Characteristics of soil organic matter in two forest soils.
Crow, Susan E.

Characteristics of soil organic matter in two forest soils. - 145 p.

Adviser: Kate Lajtha.

Thesis (Ph.D.)--Oregon State University, 2006.

Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. A long-term manipulative field experiment, the Detrital Input and Removal Treatment (DIRT) Project, was established to examine effects of altering detrital inputs (above- vs. below-ground source, C and nitrogen (N) quantity, and chemical quality) on the stabilization and retention of SOM. Surface mineral soil was collected from two DIRT sites, Bousson (a deciduous site in western Pennsylvania) and H. J. Andrews (a coniferous site in the Oregon Cascade Mountains), to examine the influence of altering detrital inputs on decomposability and mean residence time of soil organic matter and different organic matter fractions.

ISBN: 9780542712500Subjects--Topical Terms:

545717
Biogeochemistry.

Characteristics of soil organic matter in two forest soils.
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245 1 0 $a Characteristics of soil organic matter in two forest soils.
300 $a 145 p.
500 $a Adviser: Kate Lajtha.
500 $a Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2324.
502 $a Thesis (Ph.D.)--Oregon State University, 2006.
520 $a Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. A long-term manipulative field experiment, the Detrital Input and Removal Treatment (DIRT) Project, was established to examine effects of altering detrital inputs (above- vs. below-ground source, C and nitrogen (N) quantity, and chemical quality) on the stabilization and retention of SOM. Surface mineral soil was collected from two DIRT sites, Bousson (a deciduous site in western Pennsylvania) and H. J. Andrews (a coniferous site in the Oregon Cascade Mountains), to examine the influence of altering detrital inputs on decomposability and mean residence time of soil organic matter and different organic matter fractions.
520 $a Soil organic matter was physically separated into light fraction (LF) and heavy fraction (HF) organic matter, by density fractionation in 1.6 g mL-1 sodium polytungstate (SPT). Density fractionation in SPT resulted in the mobilization and loss of &sim; 25 % of total soil organic C and N during the physical separation and rinsing of fractions during recovery, which was also the most easily decomposed organic matter present in the bulk soil. At H. J. Andrews, this mobilized organic matter had a short mean residence time (MRT), indicating that it originated from fresh detrital inputs. In contrast, at Bousson, the organic matter mobilized had a long MRT, indicating that it originated from organic matter that had already been stabilized in the soil. Mean residence times of LF from Bousson varied widely, &sim; 3 y from doubled litter and control plots and 78-185 y for litter removal plots, while MRT of HF was &sim; 250 y and has not yet been affected by litter manipulations. Results from long term incubation of LF and HF material supported these estimates; respiration was greatest from LF of doubled litter and control plots and least from HF of litter removal plots. In contrast, MRT estimated for LF and HF organic matter from H. J. Andrews were similar to each other (&sim; 100 y) and were not affected by litter manipulation. These estimates were also supported by the incubation results; there was not a difference in cumulative respiration between detrital treatments or density fractions. The results from the coniferous site may be due to a legacy of historically large inputs of coarse woody debris on the LF and it may be decades before the signal of detrital manipulations can be measured. Alternatively, these highly andic soils may be accumulating C rapidly, yielding young HF ages and C that does not differ substantially in lability from coniferous litter-derived LF. The DIRT Project was intended to follow changes in soil organic matter over decades to centuries. As expected, manipulation of detrital inputs has influenced the lability and mean residence time of the light fraction before the heavy fraction organic matter; however, it will be on much more lengthy time scales that clear differences in organic matter stabilization in response to the alteration of detrital inputs will emerge. (Abstract shortened by UMI.)
590 $a School code: 0172.
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