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Filters: Contacts: Hollingsworth, Teresa N. (X)

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Long-term experiments provide a way to test presumed causes of successional or environmentally driven vegetation changes. Early-successional nitrogen (N)-fixing plants are widely thought to facilitate productivity and vegetation development on N-poor sites, thus accounting for observed vegetation patterns later in succession. We tested this facilitative impact on vegetation development in a 23-yr field experiment on an Interior Alaska ( USA) floodplain. On three replicate early-successional silt bars, we planted late-successional white spruce ( Picea glauca) seedlings in the presence and absence of planted seedlings of an early-successional N-fixing shrub, thinleaf alder ( Alnus incana). Alder initially facilitated...
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Boreal forests play critical roles in global carbon, water and energy cycles. Recent studies suggest drought is causing a decline in boreal spruce growth, leading to predictions of widespread mortality and a shift in dominant vegetation type in interior Alaska. We took advantage of a large set of tree cores collected from random locations across a vast area of interior Alaska to examine long-term trends in carbon isotope discrimination and growth of black and white spruce. Our results confirm that growth of both species is sensitive to moisture availability, yet show limited evidence of declining growth in recent decades. These findings contrast with many earlier tree-ring studies, but agree with dynamic global...
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Our documentation of Sartwell's Sedge, Carex sartwellii, on nine shrinking lakes during fieldwork in the central Yukon Flats, Alaska, represents a range extension for this species. Previously, its range extended as far northwest as Yukon, Canada, with a reported, but lost collection, from Alaska in 1895. Two earlier collections from the Yukon Flats have been verified; one was misidentified as Carex praegracilis until 2007. Carex sartwellii's assumed absence from Alaska and Yukon flora, misidentification of an earlier collection, and the remoteness of the Yukon Flats may have contributed to the rarity of its collection. In Alaska this species is morphologically similar to C. praegracilis, but can be distinguished...


    map background search result map search result map Changes in fire regime break the legacy lock on successional trajectories in Alaskan boreal forest Fire severity mediates climate‐driven shifts in understorey community composition of black spruce stands of interior Alaska Development of Alnus tenuifolia stands on an Alaskan floodplain: patterns of recruitment, disease and succession Response of plant community structure and primary productivity to experimental drought and flooding in an Alaskan fen Browning of the landscape of interior Alaska based on 1986-2009 Landsat sensor NDVI Estimating aboveground biomass in interior Alaska with Landsat data and field measurements The role of mosses in ecosystem succession and function in Alaska's boreal forest Twenty-five years of vegetation change along a putative successional chronosequence on the Tanana River, Alaska Fire, climate change, and forest resilience in interior Alaska Climate sensitivity of thinleaf alder growth on an interior Alaskan floodplain A first comprehensive census of fungi in soil reveals both hyperdiversity and fine-scale niche partitioning A Range Extension for Carex sartwellii in Interior Alaska Absence of net long-term successional facilitation by alder in a boreal Alaska floodplain Limited evidence of declining growth among moisture-limited black and white spruce in interior Alaska Twenty-five years of vegetation change along a putative successional chronosequence on the Tanana River, Alaska The role of mosses in ecosystem succession and function in Alaska's boreal forest Absence of net long-term successional facilitation by alder in a boreal Alaska floodplain Response of plant community structure and primary productivity to experimental drought and flooding in an Alaskan fen Browning of the landscape of interior Alaska based on 1986-2009 Landsat sensor NDVI A first comprehensive census of fungi in soil reveals both hyperdiversity and fine-scale niche partitioning Estimating aboveground biomass in interior Alaska with Landsat data and field measurements A Range Extension for Carex sartwellii in Interior Alaska Development of Alnus tenuifolia stands on an Alaskan floodplain: patterns of recruitment, disease and succession Climate sensitivity of thinleaf alder growth on an interior Alaskan floodplain Limited evidence of declining growth among moisture-limited black and white spruce in interior Alaska Changes in fire regime break the legacy lock on successional trajectories in Alaskan boreal forest Fire severity mediates climate‐driven shifts in understorey community composition of black spruce stands of interior Alaska Fire, climate change, and forest resilience in interior Alaska