Soil nitrogen availability in some arctic ecosystems in Northwest Alaska: responses to temperature and moisture
作者： Dan Binkley , Robert Stottlemyer , Frank Suarez , Jordi Cortina
DOI: 10.1080/11956860.1994.11682229
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摘要: AbstractWe explored patterns in soil nitrogen (N) availability five ecosystems the Noatak National Preserve northwestern Alaska, and potential response of N to changes moisture temperature. Nitrogen appeared be highest an ecosystem dominated by Alnus crispa (Ait.) Pursh, lowest willows or cotton grass tussocks. All soils responded strongly moisture; repeated watering during 30-day incubations raised net mineralization rates 1.5 3.0 fold. Net at 12°C was 5 10 fold greater than 5°C. The responses derived from strong effects treatments on both microbial (release) N, immobilization (uptake) N. For example, incubation alder site slightly increased gross more doubled reduced nitrate production 80%, ...
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