Titre :
|
Biotic and abiotic processes of eastside ecosystems : the effects of management on soil properties, processes, and productivity
|
Auteurs :
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A. Harvey ;
J. Geist ;
G. Mac Donald ;
M. Jurgensen ;
P. Cochran ;
D. Zabowski ;
R. Meurisse
|
Type de document :
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article/chapitre/communication
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Année de publication :
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1994
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Format :
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71 p.
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Langues:
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= Anglais
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Mots-clés:
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OREGON
;
WASHINGTON
;
USA
;
SCIENCES DU SOL
;
SOL
;
SOL DE FORET
;
PROPRIETE DU SOL
;
PROPRIETE PHYSICOCHIMIQUE
;
DEGATS DUS AU FEU
;
EFFET SUR SOL
;
DETERIORATION DU SOL
;
CLIMAT
;
FACTEUR BIOTIQUE
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Résumé :
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Productivity of forest and range land soils is based on a combination of diverse physical, chemical and biological properties. In ecosystems characteristic of eastside regions of Oregon and Washington, the productive zone is usually in the upper 1 or 2 m. Not only are the biological processes that drive both soil productivity and root development concentrated in limited organic horizons, but also they have evolved historically in a natural system that includes mostly modest surface disturbance. Typical disturbances include erosional, seismic, or tip-over events, and modest surface heating by periodic wildfire. This combination of properties and processes produces soils with an extremely wide range of productivity potential, but productivity can be highly sensitive to disturbances from heavy machinery or fire, when fuel accumulations are well beyond historical norms. Limited moisture-holding capacity and nitrogen storage often impose a need for carefully balancing developing vegetation with available soil resources.
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Source :
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USDA forest service - Pacific Northwest research station - general technical report, vol PNW-GTR-323
|