natural and anthropogenic drivers of calcium depletion in a northern forest during the last millennium.the pace and degree of nutrient limitation are among the most critical uncertainties in predicting terrestrial ecosystem responses to global change. in the northeastern united states, forest growth has recently declined along with decreased soil calcium (ca) availability, suggesting that acid rain has depleted soil ca to the point where it may be a limiting nutrient. however, it is unknown whether the past 60 y of changes in ca availability are strictly anthropogenic or partly a natural conseque ...201627298361
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