Bullen, Thomas

8 items:

Geochemistry of Yukon and Copper River Tributaries, Alaska Categories: Publication; Types: Citation; Tags: Monitoring 2-Standardized Stream and Lake Information
Geochemistry of Yukon and Copper River Tributaries, Alaska Categories: Publication; Types: Citation; Tags: M2-Standardized stream and lake information-1
Geochemistry of Yukon and Copper River Tributaries, Alaska Categories: Publication; Types: Citation; Tags: M2-Standardized stream and lake information-1
Geochemistry of Yukon and Copper River Tributaries, Alaska Categories: Data, Publication; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Monitoring 2-Standardized Stream and Lake Information
Coupled Nitrogen and Calcium Cycles in Forests of the Oregon Coast Range Nitrogen (N) is a critical limiting nutrient that regulates plant productivity and the cycling of other essential elements in forests. We measured foliar and soil nutrients in 22 young Douglas-fir stands in the Oregon Coast Range to examine patterns of nutrient availability across a gradient of N-poor to N-rich soils. N in surface mineral soil ranged from 0.15 to 1.05% N, and was positively related to a doubling of foliar N across sites. Foliar N in half of the sites exceeded 1.4% N, which is considered above the threshold of N-limitation in coastal Oregon Douglas-fir. Available nitrate increased five-fold across this gradient, whereas exchangeable magnesium (Mg) and calcium (Ca) in soils declined, suggesting that... Categories: Publication; Types: Citation; Tags: Biomedical and Life Sciences

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