Isotopic composition of throughfall nitrates in suburban forests with different vegetations

다국어 초록 (Multilingual Abstract)

Isotopic studies on throughfall (precipitation shedfrom foliages) nitrates are rare despite their importance as amajor nitrogen source in forest ecosystems. This study was conductedto examine a seasonal and species-related variability in isotopiccomposition of throughfall nitrates and its implications onforest nitrate sources. Event based throughfall samples were collectedfor a year from three locations (Chestnut, Pinus, and Mixedforests) along with rainfall (uninterrupted precipitation to the ground)samples from an open canopy location, and analyzed for nitrogenand oxygen isotopic composition of dissolved nitrates. δ15NNO3 andδ18ONO3 values of rainfall nitrates were greater during the nongrowingseason (Nov.~Mar.) than the growing season (Apr.~Oct.)as expected from the atmospheric nitrate cycles and associated isotopiceffects. Although the isotopic composition of throughfallnitrates followed a similar seasonal pattern with that of rainfalls,their δ15NNO3 and δ18ONO3 values were consistently higher (Sep.~Dec.)or lower (Jan.~Apr.) than rainfalls and showed an abrupt decreasein July, possibly related to the incorporation of nitrates from soiland foliar origin. Isotopic composition of throughfall nitrates alsovaried systematically with vegetation types, indicating isotopic effectsassociated with nitrate uptake and release at the forest canopy.
The seasonal and species-related variability in the isotopic compositionof throughfall nitrates indicated combined effects of atmosphericNOx cycles, dry and wet depositions, and species-specificisotopic effects associated with nitrate use.

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