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Nutrient Fluxes in Forests of the Eastern Sierra Nevada: Comparisons with Humid Forest Systems1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Johnson, Dale Walden Susfalk, Richard B. Dahlgreen, Randy A. Boucher, Virginia Bytnerowicz, Andrzej |
| Copyright Year | 1998 |
| Abstract | Preliminary results of studies on nutrientfluxes inforests ofthe eastern Sierra Nevada were compared to thosefrom more humid and polluted ecosystems. Snowmelt, soil solution, soil, and streamwater were collectedfrom J@ey and lodgepole pine Pinus jefkeyii [Grev, and Bag] and Pinus contorta Dougl.) stands in Little bllq, Nevada, and from California red$r (Abies rnagnifica A. murr.) andJefiey pine/white fir Pinus jetTreyii/Abies concolor [Gord and Glend.] Lindl.) stands at Sagehen, California. Snowmelt, soil solutions, and streamwaters from both sites were circumneutral and dominated by base cations and bicarbonate. The redfir stand at Sagehen had high NO3' concentrations (approximately 30-100 pol /L) in both snowmelt and soil solution during the relatively dry 1993-4 wateryear. The Little Valley sites had substantially lower NO,- concentrations in both snowmelt (5-20 pol /L) and soil solution (0.5-3 pol /L) in both wet and dryyears. At both sites, a pulse ofstreamwater NO; (from 0.5 to20-40 pol /L) was detected during dry years but not wet years. The Andic soils at the Sagehen site have trace levels of available Pin soils, whereas the Entisols and Inceptisols in Little Valley have10 to 100 timesgreater levels. The results suggest a hypothesis that thegreater mobility $NO; in the Sagehen redfir site was caused by the amount and timing ofN033 releasefrom snowmelt (e.g., too concentrated and early for dormant biota to respond to), and that P may also be limiting at Sagehen. Compared to other forest ecosystems in more humid and polluted environments, N, Sand H+ deposition andfluxes at the Little Valley site are extremely low, but HC03.and base cationfluxes are high. This reveals that the Little Valley site is relatively pristine, and that ionicfluxes at this site are dohinated by natural carbonic acid leaching and weathering reactions. |
| File Format | PDF HTM / HTML |
| Volume Number | 166 |
| Alternate Webpage(s) | https://www.waterboards.ca.gov/water_issues/programs/tmdl/records/region_6/2006/ref175.pdf |
| Alternate Webpage(s) | http://www.fs.fed.us/psw/publications/documents/psw_gtr166/psw_gtr166_002_johnson.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
