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1دورية أكاديمية
المؤلفون: Anthony J. Stewart, Meghan Halabisky, Chad Babcock, David E. Butman, David V. D’Amore, L. Monika Moskal
المصدر: Nature Communications, Vol 15, Iss 1, Pp 1-13 (2024)
مصطلحات موضوعية: Science
الوصف: Abstract Inland wetlands are critical carbon reservoirs storing 30% of global soil organic carbon (SOC) within 6% of the land surface. However, forested regions contain SOC-rich wetlands that are not included in current maps, which we refer to as ‘cryptic carbon’. Here, to demonstrate the magnitude and distribution of cryptic carbon, we measure and map SOC stocks as a function of a continuous, upland-to-wetland gradient across the Hoh River Watershed (HRW) in the Pacific Northwest of the U.S., comprising 68,145 ha. Total catchment SOC at 30 cm depth (5.0 TgC) is between estimates from global SOC maps (GSOC: 3.9 TgC; SoilGrids: 7.8 TgC). For wetland SOC, our 1 m stock estimates are substantially higher (Mean: 259 MgC ha−1; Total: 1.7 TgC) compared to current wetland-specific SOC maps derived from a combination of U.S. national datasets (Mean: 184 MgC ha−1; Total: 0.3 TgC). We show that total unmapped or cryptic carbon is 1.5 TgC and when added to current estimates, increases the estimated wetland SOC stock to 1.8 TgC or by 482%, which highlights the vast stores of SOC that are not mapped and contained in unprotected and vulnerable wetlands.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2041-1723Test
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2دورية أكاديمية
المؤلفون: Robert L. Deal, Ewa H. Orlikowska, David V. D’Amore, Paul E. Hennon
المصدر: Forests, Vol 8, Iss 4, p 131 (2017)
مصطلحات موضوعية: conifer plantations, broadleaf-conifer stands, ecosystem services, forest management, Alaska, Plant ecology, QK900-989
الوصف: There is worldwide interest in managing forests to improve biodiversity, enhance ecosystem services and assure long-term sustainability of forest resources. An increasingly important goal of forest management is to increase stand diversity and improve wildlife and aquatic habitat. Well-planned silvicultural systems containing a mixture of broadleaf-conifer species have potential to enhance stand diversity and provide other ecosystem services earlier than typical even-aged conifer plantations. Here, we use the example of mixed Sitka spruce/western hemlock and red alder in young, managed stands in southeast Alaska to achieve these goals. We briefly describe the silvics of Sitka spruce, western hemlock and red alder plantations as pure conifer stands or pure broadleaf stands. Then, we synthesize studies of mixed red alder-Sitka spruce/western hemlock stands in southeast Alaska and present their potential for improving stand structural complexity, biodiversity and other ecosystem services over pure conifer forests. Finally, we discuss some of the opportunities and potential tradeoffs for managing mixed broadleaf-conifer stands for providing a number of natural resources and the influence of these broadleaf-conifer forests on ecosystem linkages and processes.
وصف الملف: electronic resource
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3دورية أكاديمية
المؤلفون: Tara N. Jennings, Brian J. Knaus, Katherine Alderman, Paul E. Hennon, David V. D'Amore, Richard Cronn
المصدر: Applications in Plant Sciences, Vol 1, Iss 9, p 1300025 (2013)
مصطلحات موضوعية: Callitropsis nootkatensis, Chamaecyparis nootkatensis, climate change, germplasm, Pacific Northwest, Nootka cypress, Biology (General), QH301-705.5, Botany, QK1-989
الوصف: Premise of the study: Microsatellite primers were developed for Nootka cypress (Callitropsis nootkatensis) to provide quantitative measures for gene conservation that can assist in guiding management decisions for a species experiencing climate-induced decline. Methods and Results: Using multiplexed massively parallel sequencing, we identified 136,785 microsatellite-containing sequences from 489,625 Illumina paired-end 80-bp reads. After stringent filtering, we selected 144 primer pairs and screened variation at these loci in five populations of C. nootkatensis. Loci show between three and 36 dinucleotide repeats per locus, with an average of 13. Screening of these markers in the Pacific Northwest relative Chamaecyparis lawsoniana demonstrated no marker transferability. This finding highlights the narrow taxonomic utility of microsatellite markers in Callitropsis. Conclusions: These microsatellites show high polymorphism and can be used for routine screening of natural variation in Callitropsis nootkatensis, and will be particularly helpful in identifying clones and inbred relatives at the stand-level.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2168-0450Test
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المؤلفون: Sean W. Fleming, Peter M. Kiffney, Brian P. V. Hunt, David V. D'Amore, Heida L. Diefenderfer, Jason B. Fellman, Sarah M. Bisbing, David Butman, Eran Hood, Gavin McNicol, Brian Buma, Amritpal Lally, Allison L. Bidlack, Brian Menounos, William C. Floyd, Ian Giesbrecht, Kenneth P. Lertzman, Suzanne E. Tank, Steven S. Perakis
المصدر: Bioscience
مصطلحات موضوعية: 0106 biological sciences, 010504 meteorology & atmospheric sciences, AcademicSubjects/SCI00010, Ecology, carbon, 010604 marine biology & hydrobiology, Climate change, coastal margin, 01 natural sciences, Overview Articles, climate change, temperate rainforest, Margin (machine learning), Environmental science, AcademicSubjects/SOC02100, Marine ecosystem, General Agricultural and Biological Sciences, Temperate rainforest, terrestrial aquatic links, 0105 earth and related environmental sciences
الوصف: Coastal margins are important areas of materials flux that link terrestrial and marine ecosystems. Consequently, climate-mediated changes to coastal terrestrial ecosystems and hydrologic regimes have high potential to influence nearshore ocean chemistry and food web dynamics. Research from tightly coupled, high-flux coastal ecosystems can advance understanding of terrestrial–marine links and climate sensitivities more generally. In the present article, we use the northeast Pacific coastal temperate rainforest as a model system to evaluate such links. We focus on key above- and belowground production and hydrological transport processes that control the land-to-ocean flow of materials and their influence on nearshore marine ecosystems. We evaluate how these connections may be altered by global climate change and we identify knowledge gaps in our understanding of the source, transport, and fate of terrestrial materials along this coastal margin. Finally, we propose five priority research themes in this region that are relevant for understanding coastal ecosystem links more broadly.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bb83d6d7dd24d98640399c34f99a048Test
https://doi.org/10.1093/biosci/biaa171Test -
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المؤلفون: Ian J. W. Giesbrecht, Suzanne E. Tank, Gordon W. Frazer, Eran Hood, Santiago G. Gonzalez Arriola, David E. Butman, David V. D’Amore, David Hutchinson, Allison Bidlack, Ken P. Lertzman
المصدر: Global Biogeochemical Cycles. 36
مصطلحات موضوعية: Atmospheric Science, Global and Planetary Change, Environmental Chemistry, General Environmental Science
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::157bd75ef18754840eb7e409644f06b1Test
https://doi.org/10.1029/2021gb007047Test -
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المؤلفون: Jason B. Fellman, David V. D'Amore, Richard T. Edwards, Eran Hood
المصدر: Biogeochemistry. 152:253-270
مصطلحات موضوعية: Hydrology, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Wetland, 04 agricultural and veterinary sciences, Seasonality, medicine.disease, 01 natural sciences, Nutrient, Streamflow, 040103 agronomy & agriculture, medicine, 0401 agriculture, forestry, and fisheries, Environmental Chemistry, Environmental science, Poor fen, Ecosystem, Surface runoff, Temperate rainforest, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology
الوصف: The perhumid coastal temperate rainforest (PCTR) of northwestern North America is projected to become warmer and wetter in coming decades, with largely unquantified implications for the magnitude and speciation of riverine nitrogen (N) and phosphorus (P) export from PCTR ecosystems. We collected streamwater at weekly to monthly intervals for a year and intensively during two multi-day storms (one each in summer and the autumn rainy season) from streams draining three of the most common landcover types in southeast Alaska (poor fen, forested wetland and upland forest). Our goal was to investigate how seasonal and episodic (stormflows) changes in runoff influence the magnitude and species of dissolved N and P exported from PCTR watersheds. Riverine yields of total dissolved N and P ranged from 238 to 406 kg km2 year− 1 for N and 11 to 17 kg km2 year− 1 for P and were dominated by organic nutrient forms. Yields of N and P showed a varied response to runoff, with both hydrologic transport and source limitation of nutrient yields observed across the landcover types. During stormflows, log transformed ratios of dissolved inorganic N to soluble reactive P decreased from prestorm levels of ~ 1.0 to 1.5 to less than 0.3 during peak flow at all sites, illustrating that storms induce ephemeral changes in inorganic nutrient export and stoichiometry. Our findings highlight the pulsed nature of dissolved N and P export from PCTR watersheds suggesting that future changes in the seasonality and intensity of precipitation may influence the flow of terrestrial nutrients to marine ecosystems.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::e935260fbcf7c84bb2341073afdbcb25Test
https://doi.org/10.1007/s10533-020-00752-wTest -
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المؤلفون: Brandon S. Gerig, Jacob F. Berkowitz, David V. D'Amore, Dominic T. Chaloner, Scott D. Bridgham
المصدر: Soil Science Society of America Journal. 84:877-887
مصطلحات موضوعية: geography, geography.geographical_feature_category, Nutrient, Ecology, Soil water, Soil Science, Environmental science, Riparian zone
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::e409aa4c560d1beab3a0d8b550937faeTest
https://doi.org/10.1002/saj2.20043Test -
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المصدر: Northwest Science. 95
مصطلحات موضوعية: Biomass (ecology), biology, ved/biology, ved/biology.organism_classification_rank.species, food and beverages, Forestry, Understory, biology.organism_classification, Graminoid, Shrub, Tsuga, Habitat, Western Hemlock, Environmental science, Forb, Ecology, Evolution, Behavior and Systematics
الوصف: Quantifying forest understory biomass is important for understanding ecological processes, but there are few methods for non-destructive measurement of understory biomass in southeast Alaska. We developed cover-to-biomass equations for common understory species in young-growth Sitka spruce (Picea sitchensis)–western hemlock (Tsuga heterophylla) forests. A sampling method of visually estimating cover and destructively measuring biomass was used at 35 stands aged 10 to 67 years on Prince of Wales Island in southeast Alaska from 2007 to 2018. Linear cover to biomass regressions were fitted for 42 species and other genera. In addition to total biomass, regressions were fitted by part (leaves, twigs, wood) for all woody species. Regressions were also fitted for graminoid, fern, forb, shrub, tree, and conifer functional classes. We demonstrate the utility of these regressions by applying them to the Tongass-wide young-growth studies, a rich dataset with understory cover measurements from treated and un-treated stands in four young-growth age classes. Understory biomass was greater in 0- to 5-year-old even-aged stands than stands greater than 15 years old. Treated stands (thinned, etc.) had a greater understory biomass, annual growth, and carbon than untreated stands older than 15 years. Additionally, biomass composition became less woody with increasing stand age in treated stands. These regressions provide an approach to estimate understory biomass, which can be used for evaluation of forest functions, including understory dynamics, wildlife habitats, and total stand carbon.
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::7f803a690dc126b8b58f0c0e89559d80Test
https://doi.org/10.3955/046.095.0108Test -
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المؤلفون: David V. D'Amore, Colleen T. E. Kellogg, Steven J. Hallam, Thierry J. Heger, David J. Levy-Booth, William W. Mohn, Ian Giesbrecht, Patrick J. Keeling
المصدر: The ISME Journal
مصطلحات موضوعية: Biogeochemical cycle, Northwestern United States, Rainforest, Peat, Climate, Biology, Microbiology, Article, Carbon Cycle, Carbon cycle, Soil, 03 medical and health sciences, Bog, Soil Microbiology, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, 2. Zero hunger, Phylotype, 0303 health sciences, geography, geography.geographical_feature_category, 030306 microbiology, Ecology, Gene Expression Profiling, Soil chemistry, Carbon Dioxide, 15. Life on land, 13. Climate action, Seasons, Methane, Soil microbiology
الوصف: The Pacific coastal temperate rainforest (PCTR) is a global hot-spot for carbon cycling and export. Yet the influence of microorganisms on carbon cycling processes in PCTR soil is poorly characterized. We developed and tested a conceptual model of seasonal microbial carbon cycling in PCTR soil through integration of geochemistry, micro-meteorology, and eukaryotic and prokaryotic ribosomal amplicon (rRNA) sequencing from 216 soil DNA and RNA libraries. Soil moisture and pH increased during the wet season, with significant correlation to net CO2 flux in peat bog and net CH4 flux in bog forest soil. Fungal succession in these sites was characterized by the apparent turnover of Archaeorhizomycetes phylotypes accounting for 41% of ITS libraries. Anaerobic prokaryotes, including Syntrophobacteraceae and Methanomicrobia increased in rRNA libraries during the wet season. Putatively active populations of these phylotypes and their biogeochemical marker genes for sulfate and CH4 cycling, respectively, were positively correlated following rRNA and metatranscriptomic network analysis. The latter phylotype was positively correlated to CH4 fluxes (r = 0.46, p
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe801f4fda3959c0a2d5d3d3de73fbedTest
https://doi.org/10.1038/s41396-018-0334-3Test
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