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We evaluated N dynamics on a climate gradient on old (> 4 million year) basaltic substrate on the Island of Kaua’i, Hawai’i, to evaluate the utility of pedogenic thresholds and soil process domains for understanding N cycling in terrestrial ecosystems. Studies of nitrogen dynamics on the climate gradient on a younger basaltic substrate (~ 150,000 year) had found a good match between soil process...
Abstract We used isotopes of Sr to quantify weathering versus atmospheric sources of foliar Sr in 34 Hawaiian forests on young volcanic soils. The forests varied widely in climate, and in lava flow age and texture. Weathering supplied most of the Sr in most of the sites, but atmospheric deposition contributed 3050% of foliar Sr in the wettest rainforests. A stepwise multiple regression using annual...
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