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  • 1
    Online Resource
    Online Resource
    Wiley ; 2000
    In:  Soil Science Society of America Journal Vol. 64, No. 5 ( 2000-09), p. 1834-1845
    In: Soil Science Society of America Journal, Wiley, Vol. 64, No. 5 ( 2000-09), p. 1834-1845
    Abstract: Estimates of C storage in mountainous regions are rare. Forest–meadow ecotones in subalpine ecosystems, which contain a mosaic of forests and meadows, may be particularly sensitive to future changes in climate and are therefore important to include in estimates of terrestrial C storage. In this study, we quantified soil C and ecosystem C pools in subalpine forest and meadow soils of the northeastern (NE, dry climate) and southwestern (SW, wet climate) Olympic Mountains. Carbon concentrations of mineral soil are relatively high in upper horizons, ranging from 43 to 142 g kg −1 in NE soils and 27 to 162 g kg −1 in SW soils. Northeastern meadow soils store more C than NE forests , while SW forest soils store more C than SW meadows Ecosystem C storage is greater in forests than in meadows. Under a warmer climatic scenario with drier summers and wetter winters, subalpine C storage may decrease in the NE and increase in the SW, and changes in C storage will be closely related to vegetation distribution, ecosystem productivity, decomposition rates, and local disturbance regimes. Because ecosystem processes and associated C storage differ between high‐ and low‐elevation ecosystems, it is important that data from both high‐ and low‐elevation sites are included in estimates of C storage in terrestrial ecosystems.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2000
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    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
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    SSG: 21
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  • 2
    In: The Holocene, SAGE Publications, Vol. 4, No. 1 ( 1994-03), p. 89-100
    Abstract: Changes in the distribution of sub-alpine tree species in western North America have been attributed to climatic change and other environmental stresses. These changes include tree-line fluctuations throughout the Holocene and recent invasion of sub-alpine meadows by forest. Most palaeoecological studies suggest that the tree-line was higher during a period of warmer climate approximately 9000 to 5000 BP and lower during the last 5000 years, with short periods of local tree-line advance. Recent advances in sub-alpine tree distribution can be compared with weather records, allowing an examination of relationships between tree advance and climate at a finer resolution. In general, recent sub-alpine forest advances in western North America, based on studies representing three climatic zones (maritime, Mediterranean and continental), have been associated with climatic periods favouring tree germination and growth, although factors such as fire and grazing by domestic livestock have had an impact in some areas. Limitations to tree establishment (e.g., winter snow accumulation, summer drought) vary in relative importance within each climate zone, as do predicted consequences of anthropogenic climatic change. Recent increases in establishment of sub-alpine trees may continue if climatic change alleviates the limitations to tree establishment important in each climatic zone. However, factors such as topography and disturbance may modify tree establishment on a local scale.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1994
    detail.hit.zdb_id: 2027956-5
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    SSG: 3,4
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  • 3
    Online Resource
    Online Resource
    Wiley ; 1982
    In:  Soil Science Society of America Journal Vol. 46, No. 6 ( 1982-11), p. 1310-1315
    In: Soil Science Society of America Journal, Wiley, Vol. 46, No. 6 ( 1982-11), p. 1310-1315
    Abstract: Variation in nutrients was studied over a two‐year period in adjacent floodplain and upland forest soils in central Illinois. Nutrient pools of all elements except Na were greater in floodplain soils than in upland soils and were in the following order at both study sites: exchangeable Ca 〉 exchangeable Mg 〉 exchangeable K 〉 available P. Seasonal variation in nutrient content of soils was the result of several environmental factors. Available P in floodplain soils was highly dependent on pH, which was in turn influenced by flooding, but there was no evidence of seasonal variation in available P for upland soils. Soil pH was positively correlated with the concentration of exchangeable bases in both soils, especially Ca and Mg in upland soils. Exchangeable Na was highly variable at both floodplain and upland sites and may have been influenced by leaching and variation in tree root exudation. The seasonal variation in nutrient pools of forest soils in this study has implications for tree growth, site evaluation, and nutrient cycling in forest stands.
    Type of Medium: Online Resource
    ISSN: 0361-5995 , 1435-0661
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 1982
    detail.hit.zdb_id: 241415-6
    detail.hit.zdb_id: 2239747-4
    detail.hit.zdb_id: 196788-5
    detail.hit.zdb_id: 1481691-X
    SSG: 13
    SSG: 21
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    SAGE Publications ; 1991
    In:  The Holocene Vol. 1, No. 1 ( 1991-03), p. 50-61
    In: The Holocene, SAGE Publications, Vol. 1, No. 1 ( 1991-03), p. 50-61
    Abstract: Basal area growth trends were determined for ponderosa pine (Pinus ponderosa) in the Sierra Nevada, California, USA, to: (1) evaluate long term growth patterns, and (2) determine if there has been any recent change in the frequency of growth changes outside the expected range of natural variability. Ponderosa pine was sampled in 56 stands with the sample divided equally between sites with and without documentation of symptomatic ozone injury. Basal area increment growth was calculated, temporal growth patterns were evaluated for each tree using time series analysis techniques, and changes in growth trends were summarized for each site by decade. There were several regional growth trends during this century, including a large number of growth decreases in the 1920s and a large number of increases in the 1930s. Many trends were synchronous within stands but were less frequently synchronous between stands. There were significant growth reductions since 1950 in some stands in the southern Sierra. These growth reductions occurred in areas with the highest levels of ozone exposure and needle injury. There was no evidence, however, of significant numbers of recent growth reductions for the entire Sierra Nevada region. Some sites had growth changes possibly associated with stand dynamics, management practices, and pathogens.
    Type of Medium: Online Resource
    ISSN: 0959-6836 , 1477-0911
    RVK:
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1991
    detail.hit.zdb_id: 2027956-5
    SSG: 14
    SSG: 3,4
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  • 5
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2012
    In:  Climatic Change Vol. 110, No. 1-2 ( 2012-1), p. 269-296
    In: Climatic Change, Springer Science and Business Media LLC, Vol. 110, No. 1-2 ( 2012-1), p. 269-296
    Type of Medium: Online Resource
    ISSN: 0165-0009 , 1573-1480
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2012
    detail.hit.zdb_id: 751086-X
    detail.hit.zdb_id: 1477652-2
    SSG: 14
    Location Call Number Limitation Availability
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  • 6
    In: Climatic Change, Springer Science and Business Media LLC, Vol. 165, No. 1-2 ( 2021-03)
    Type of Medium: Online Resource
    ISSN: 0165-0009 , 1573-1480
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 751086-X
    detail.hit.zdb_id: 1477652-2
    SSG: 14
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  • 7
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2009
    In:  Quaternary Research Vol. 72, No. 1 ( 2009-07), p. 57-67
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 72, No. 1 ( 2009-07), p. 57-67
    Abstract: We reconstructed a 10,500-yr fire and vegetation history of a montane site in the North Cascade Range, Washington State based on lake sediment charcoal, macrofossil and pollen records. High-resolution sampling and abundant macrofossils made it possible to analyze relationships between fire and vegetation. During the early Holocene ( 〉 10,500 to ca. 8000 cal yr BP) forests were subalpine woodlands dominated by Pinus contorta . Around 8000 cal yr BP, P. contorta sharply declined in the macrofossil record. Shade tolerant, mesic species first appeared ca. 4500 cal yr BP. Cupressus nootkatensis appeared most recently at 2000 cal yr BP. Fire frequency varies throughout the record, with significantly shorter mean fire return intervals in the early Holocene than the mid and late Holocene. Charcoal peaks are significantly correlated with an initial increase in macrofossil accumulation rates followed by a decrease, likely corresponding to tree mortality following fire. Climate appears to be a key driver in vegetation and fire regimes over millennial time scales. Fire and other disturbances altered forest vegetation at shorter time scales, and vegetation may have mediated local fire regimes. For example, dominance of P. contorta in the early Holocene forests may have been reinforced by its susceptibility to frequent, stand-replacing fire events.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2009
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 8
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2018
    In:  Climatic Change Vol. 146, No. 1-2 ( 2018-1), p. 89-102
    In: Climatic Change, Springer Science and Business Media LLC, Vol. 146, No. 1-2 ( 2018-1), p. 89-102
    Type of Medium: Online Resource
    ISSN: 0165-0009 , 1573-1480
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 751086-X
    detail.hit.zdb_id: 1477652-2
    SSG: 14
    Location Call Number Limitation Availability
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