Factors influencing the availability of nitrogen in thinned and unthinned Douglas-fir stands in the central Oregon Cascades

Soil N mineralized during 7-day anaerobic incubation at 40°C (‘available’ N) was compared at two soil depths and correlated to soil and site factors in Douglas-fir stands with different combinations of thinning and multinutrient fertilization. Available N expressed either on an area basis (kg ha −1)...

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Bibliographic Details
Published in:Forest ecology and management 1997-06, Vol.93 (3), p.195-203
Main Authors: Martinez, Alejandro Velazquez, Perry, David A.
Format: Article
Language:English
Subjects:
AZOTE
CICLO BIOGEOQUIMICO
CYCLE BIOGEOCHIMIQUE
CYCLING
EDAPHIC FACTORS
FACTEUR EDAPHIQUE
FACTORES EDAFICOS
NITROGEN
NITROGENO
Nutrient cycling
OREGON
PSEUDOTSUGA MENZIESII
Topoedaphic controls
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Summary:Soil N mineralized during 7-day anaerobic incubation at 40°C (‘available’ N) was compared at two soil depths and correlated to soil and site factors in Douglas-fir stands with different combinations of thinning and multinutrient fertilization. Available N expressed either on an area basis (kg ha −1) or on a concentration basis (mg kg −1) at the two depths did not vary significantly by stocking density, treatment, or density-treatment interaction. There was a significant difference between the soil depths, averaging 39 mg kg −1 at 0–20 cm depth, and 20 mg kg −1 at 20–40 cm depth. Available N was positively correlated with total soil N, exchangeable Ca, and adjusted aspect (the former two factors accounting for 46% of the total variation), and negatively with rock content and slope steepness. Stand density had no effect.
ISSN:0378-1127
1872-7042
DOI:10.1016/S0378-1127(96)03953-9