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- W4248966757 abstract "We studied temporal and spatial patterns of soil nitrogen (N) dynamics from 1993 to 1995 in three watersheds of Fernow Experimental Forest, W.V.: WS7 (24-year-old, untreated); WS4 (mature, untreated); and WS3 (24-year-old, treated with (NH 4 ) 2 SO 4 since 1989 at the rate of 35 kg N·ha 1 ·year 1 ). Net nitrification was 141, 114, and 115 kg N·ha 1 ·year 1 , for WS3, WS4, and WS7, respectively, essentially 100% of net N mineralization for all watersheds. Temporal (seasonal) patterns of nitrification were significantly related to soil moisture and ambient temperature in untreated watersheds only. Spatial patterns of soil water NO 3 of WS4 suggest that microenvironmental variability limits rates of N processing in some areas of this N-saturated watershed, in part by ericaceous species in the herbaceous layer. Spatial patterns of soil water NO 3 in treated WS3 suggest that later stages of N saturation may result in higher concentrations with less spatial variability. Spatial variability in soil N variables was lower in treated WS3 versus untreated watersheds. Nitrogen additions have altered the response of N-processing microbes to environmental factors, becoming less sensitive to seasonal changes in soil moisture and temperature. Biotic processes responsible for regulating N dynamics may be compromised in N-saturated forest ecosystems." @default.
- W4248966757 created "2022-05-12" @default.
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- W4248966757 date "2001-10-01" @default.
- W4248966757 modified "2023-09-26" @default.
- W4248966757 title "Temporal and spatial variation of nitrogen transformations in nitrogen-saturated soils of a central Appalachian hardwood forest" @default.
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- W4248966757 doi "https://doi.org/10.1139/x01-106" @default.
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