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294 results for “forest plot”
Far northeastern Siberia boreal forest data: Mean soil temperature within experimental burn plots
This dataset includes soil temperature (10-cm depth) during July-Sept 2013 within experimental burn plots in far northeastern Cherskii. Data have not been published.
Far northeastern Siberia boreal forest data: Larch recruitment within experimental burn plots
This dataset includes larch recruitment during summer 2013 within experimental burn plots in far northeastern Cherskii. Data have not been published.
Annual aspen growth (basal area increment; BAI) of 84 aspen that were alive and 76 that were dead when sampled in 2016 from 22 plots (eight sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI)
This dataset contains basal area increment (BAI) chronologies of 84 aspen the were alive and 76 that were dead in 2016. Live trees were cored and dead trees felled in 2016 across 22 plots (eight sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI). Chronologies of BAI extend as far back as 1901 and up to 2015.
Tree characteristics of 84 aspen that were alive and 76 that were dead when sampled in 2016 from 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI)
This dataset contains diameter at breast height (DBH) in 2016 and 1997, canopy position in 2016, last year of full growth, year of death, year established, age at last year of full growth, and age at year of death of 84 aspen that were alive and 76 that were dead in 2016 from 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI).
Annual maximum summer NDVI (NDVImax) at 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI) from 1986 - 2015.
This dataset contains annual plot-level measurements from 1986-2015 of annual maximum summer NDVI (NDVImax) from 22 plots (8 sites) that are a part of the Cooperative Alaska Forest Inventory (CAFI).
Hubbard Brook Experimental Forest Valleywide Plots: GIS Shapefile
This coverage was developed as part of Paul Schwarz's dissertation research. Fifteen North-South transects were established at 500m intervals to span the entire Hubbard Brook Valley. Between 1995 and 1997, 371 plots were positioned at 100m and 200m intervals along each transect. In 1998, 60 additional plots were positioned: three plots were placed at 25m intervals between two existing plots at 20 locations that were stratified according to elevation and aspect and selected at random. Hence, a system of 431 permanent 500 square meter circular plots were established. No plots were located in the six experimental watersheds designated for ecosystem research. The sampling layout of the plots was chosen to facilitate the analysis of spatial patterns in the forest vegetation by utilizing a wide range of distance intervals between plots. These intervals ranged from approximately 25m to several thousand meters. Data distributed as shapefile in Coordinate system EPSG:26919 - NAD83 / UTM zone 19N.
Mineral soil and forest floor depth for the Hubbard Brook Valley Plots, 1997 - 1998 Survey Data
The valley-wide plots are a grid of 431 sites along fifteen N–S transects established at 500-m intervals spanning the entire Hubbard Brook Valley. Multiple above- and below- ground attributes were measured between 1995 and 1998. This dataset includes soil core horizon depth data; tree inventory, soil chemistry data and other measurements are presented in separate datasets. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Forest Inventory of the DroughtNet plots at the Hubbard Brook Experimental Forest
A throughfall removal manipulation is being carried out within a beech, birch and maple forest stand at Hubbard Brook Experimental Forest as part of the Northern Forest DroughtNet project, in collaboration with Climate Change Across Seasons Experiment (CCASE). Two 15 x 15 m plots have a series of troughs covering 50% of the surface area to remove throughfall and reduce soil moisture, in order to simulate a 1st percentile drought based on the long term meteorological record. DBH measurements were recorded for all trees > 10 cm DBH beginning in spring of 2014, and remeasured annually. Drought and control plots will be compared to determine the effect of reduced soil moisture availability on tree growth. This dataset includes measurements from 2014. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Forest Inventory of the Climate Change Across Seasons Experiment (CCASE) plots at the Hubbard Brook Experimental Forest
DBH was measured for all trees greater than or equal to 5 cm DBH within Climate Change Across Seasons Experiment (CCASE) plots. Reference (or control) plots are shared with the collaborating Northern Forest DroughtNet experiment. There are six plots total (each 11 x 14m). Two are warmed 5 degrees C throughout the growing season (Plots 3 and 4). Two others are warmed 5 degrees C in the growing season and have snow removed during winter to induce soil freeze/thaw cycles (Plots 5 and 6). Four kilometers (2.5 mi) of heating cable are buried in the soil to warm these four plots. Two additional plots serve as controls for our experiment (Plots 1 and 2). This data set includes tree dbh measurements for 2012. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Forest Inventory of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest
As the climate changes, it is thought that ice storms will begin to occur with increasing frequency. This project evaluates the damage and changes ice storms cause to northern hardwood forests in forest structure, nutrient cycling and carbon storage. Ten 20x30 meter plots were established in a predominately sugar maple stand, with four icing treatments and 2 control plots. This data set includes species and diameter breats height measurements of every tree with a DBH greater than or equal to 5 cm, as of June 2015. Trees will be remeasured every spring until 2019. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Red spruce foliar nutritional and metabolic responses to N, Ca, and N+Ca additions in a plot level study from Hubbard Brook Experimental Forest NH, Adirondack State Park, NY and Groton State Forest, VT from 1997-2000.
Plot Level Ca, N, Ca+N Study Background: Three mature red spruce (Picea rubens Sarg.) – balsam fir (Abies balsamea (L.) Mill.) stands with closed canopies from across the northeastern United States were selected to assess the effects of N and Ca additions on forest growth. These sites included Groton, VT (Groton State Forest), Big Moose Lake, NY (Adirondack State Park) and Watershed 9 in the Hubbard Brook Experimental Forest, NH. Site descriptions can be found in the pdf file included in this dataset. Full site descriptions have been published in Kulmatiski et al, 2007, Nitrogen and calcium additions increase forest growth in northeastern USA spruce–fir forests, Canadian Journal of Forest Research 37: 1574-1585. This publication also provides more in-depth site and soil descriptions. In 1992, three replicate 30 m by 30 m plots were randomly assigned to each of four treatment levels: control (control), Ca addition (Ca), N addition (N), or Ca + N addition (Ca + N) in NY and NH (for a total of 12 plots at each site). In VT, only control and Ca treatments were established due to limited space and research goals (for a total of 6 plots). Beginning in July 1992 through July 2000, N amendments (100 kilograms of NH4NO3-N per hectare per year), Ca amendments (80 kilograms of CaSO4-Ca plus 80 kilograms of CaCl2-Ca per hectare per year), and Ca + N (same dosage as separate applications) amendments were hand broadcast as commercial grade salts. Applications were made in June, July, and August to each plot in each year. SUMMARY: The main objectives of this study were to evaluate changes over time (1997-2000) in foliar metabolism of mature red spruce (Picea rubens Sarg.) trees in response to additions of nitrogen, Ca, or N +Ca supplementation. N was applied as NH4NO3 and Ca was applied as gypsum [CaSO4 .2H2O (2X) + CaCl2 .2H2O (1X)] and Ca + N treatment was a combination of both at the same concentrations Three sites received these treatments; Groton, VT (Groton State Forest), Bi
Hubbard Brook Experimental Forest: Soil respiration in mycorrhizal gradient plots
Soil respiration is the dominant pathway by which terrestrial carbon enters the atmosphere. Many abiotic and biotic processes can influence soil respiration, including soil microbial community composition. Mycorrhizal fungi are a particularly important microbial group to investigate because they are known to influence soil chemistry and nutrient cycling, and, because the type of mycorrhizal fungi in an ecosystem can be assessed based on the plant species present, they may be easier than other soil microbes to incorporate into ecosystem models. We tested how the type of mycorrhizal fungi—arbuscular (AM) or ectomycorrhizal (ECM) fungi—associated with the dominant tree species in a mixed hardwood forest was related to soil respiration rate. We measured soil respiration, root biomass and surface area, and soil chemical and physical characteristics during the growing season in plots dominated by ECM-associated trees, AM-associated trees, and mixtures with both at Hubbard Brook Experimental Forest in Woodstock, NH, USA. We found rates of soil respiration that were 29% and 32% higher in AM plots than in ECM and mixed plots, respectively. These differences were primarily explained by corresponding variation in soil conditions including organic horizon depth and soil nitrogen content. Soil in AM plots had slightly higher nitrogen concentrations and deeper organic horizons than soil in ECM and mixed plots. Our results highlight the importance of considering mycorrhizal associations of dominant vegetation as predictors of carbon cycling processes. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Measurements of gross N cycling rates in the soils of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest
As the climate changes, it is thought that ice storms will begin to occur with increasing frequency. This project evaluates the damage and changes ice storms cause to northern hardwood forests in nutrient cycling. Ten 20x30 meter plots were established in a predominately sugar maple stand, with 4 icing treatments and 2 control plots. This data set includes gross ammonification, gross ammonium consumption, gross nitrification, and gross nitrate consumption monitored in the Ice Storm Experiment plots at the Hubbard Brook Experimental Forest from 2015-2017.
Measurements of N cycling dynamics in the soils of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest
As the climate changes, it is thought that ice storms will begin to occur with increasing frequency. This project evaluates the damage and changes ice storms cause to northern hardwood forests in nutrient cycling. Ten 20x30 meter plots were established in a predominately sugar maple stand, with 4 icing treatments and 2 control plots. This data set includes soil nitrate (NO3-) and ammonium (NH4+) concentrations, microbial biomass carbon (C ) and nitrogen (N) content, microbial respiration, potential nitrification and N mineralization rates determined via lab incubation and in situ field incubations, denitrification potential, and organic matter content monitored in the Ice Storm Experiment plots at the Hubbard Brook Experimental Forest from 2015-2017.
Hubbard Brook Experimental Forest: soil, litter, plant and microbial attributes on mycorrhizae litter decomposition plots
Studies show mycorrhizal fungi can influence leaf litter decomposition in a variety of ways, but the effects of arbuscular mycorrhizal (AM) fungi and ectomycorrhizal (ECM) fungi on litter decay in forests vary widely across published reports. We experimentally reduced the presence of fine roots and their associated mycorrhizal fungi by soil trenching within a series of plots spanning a gradient of mycorrhizal dominance containing from 96% AM to 100% ECM-associated trees at Hubbard Brook Experimental Forest in Woodstock, NH. We incubated four species of leaf litter in mesh decomposition bags in areas with reduced access to roots and mycorrhizal fungi and in adjacent areas with intact roots and mycorrhizal fungi. After 608 days of decomposition (November 2017 through July 2019), we found that litter decayed more rapidly in the presence of fine roots and mycorrhizal hyphae in all plots, regardless of dominant tree mycorrhizal type. Root and mycorrhizal exclusion did not affect enzyme activities on decomposing litter or soil microbial community composition. Despite reports that both AM and ECM fungi may reduce litter decay rate, our results indicate that AM and ECM-associated fine roots stimulate litter decomposition.
Hubbard Brook Experimental Forest: Soil-atmosphere fluxes of carbon dioxide, nitrous oxide and methane on snow removal plots
Soil atmosphere fluxes of the trace gases; carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) have been measured at several locations at the Hubbard Brook Experimental Forest (HBEF) including 1) the “freeze” study reference plots that provide contrast between stands dominated (80%) by sugar maple versus yellow birch and low and high elevation areas, 2) the Bear Brook Watershed where trace gas sampling is coordinated with long-term monitoring of microbial biomass and activity and 3) watershed 1 where trace gas sampling locations were co-located with long-term microbial biomass and activity monitoring sites that are located near a subset of the lysimeter sites established for the calcium addition study on this watershed. This dataset contains the Freeze study data. Watershed 1 and Bear Brook trace gas data can be found in: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-hbr&identifier=116. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station. These data have been published in: Groffman, P. M., Hardy, J. P., Driscoll, C. T., & Fahey, T. J. (2006). Snow depth, soil freezing, and fluxes of carbon dioxide, nitrous oxide and methane in a northern hardwood forest. Global Change Biology, 12, 1748–1760.
Coarse Woody Debris of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest
The ice storm experiment was a novel experimental approach creating a suite of ice storms in a mature hardwood forest in New Hampshire, USA. The experiment included five ice storm intensities (0, 6.4, 12.7, and 19.1 mm radial ice accretion) applied in a single year, and one ice storm intensity (12.7 mm) applied in two consecutive years. This dataset quantifies the coarse woody debris transferred from the forest canopy to the soil under the different icing conditions. In this forest, little damage occurred below 6.4 mm radial ice accretion, moderate damage occurred with up to 12.7 mm of accretion, and significant branch breakage and canopy damage occurred with 19.1 mm of ice. The icing in consecutive years demonstrated an interactive effect of ice storm frequency and severity such that some branches damaged in the first year of icing appeared to remain in the canopy and then fall to the ground in the second year of icing. These results have implications for National Weather Service ice storm warning levels, and they provide a quantitative assessment of ice-load related inputs of forest debris that will be useful to municipalities creating response plans for current and future ice storms. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Permanent forest plot data from 1982-2019 at Niwot Ridge, Colorado
The permanent forest plots at Niwot Ridge were installed in subalpine forests in the Colorado Front Range by Dr. Thomas T. Veblen in the early 1980s. The goal was to establish a set of long-term forest plots to monitor tree populations and stand dynamics over time. Ten large permanent plots (i.e., from 21 x 54m to 54 m x 54 m) were installed to monitor ~ 400 trees per plot. An additional thirty smaller ‘gap’ plots (i.e. approximately 10 m x 10 m) were installed in canopy openings adjacent to three of the large permanent plots to monitor gap dynamics (c. 40 trees per plot). Three new plots (42x42 m) were installed in 2016 (MRS11,13) or 2017 (MRS12) following the protocol for the large permanent plots. The plots are located across gradients in elevation and site moisture conditions. Plots include the following subalpine tree species: lodgepole pine (“Pinus contorta”), limber pine (“Pinus flexilis”), Engelmann spruce (“Picea engelmannii”), subalpine fir (“Abies lasiocarpa”), and aspen (“Populus tremuloides”). When the plots were installed, all living and standing dead trees were permanently tagged, and the following was measured for all live and dead trees less than 4 cm dbh: species, diameter at breast height (1.4 m), height class, and status (live or dead). Censuses of tree mortality were conducted roughly every three years, except the period 1994-2007, and a complete re-measurement (e.g. dbh measurements) was conducted in 2016 (see methods for details) and a status check (live/dead) was conducted in 2019. Counts of juvenile trees (less than 4 cm dbh) by species were conducted when the plots were installed and in 2017. This database includes three datasets: 1) description of plots (e.g. elevation, aspect, size), 2) tree data (e.g. dbh, height class, status) for all trees (greater than 4 cm dbh) monitored from early 1980s to 2019, and 3) counts of juvenile trees (less than 4 cm) by species in early 1980s and 2017.
Species Abundance Distributions (SADs) for local tree communities in 1-ha forest plots on 20 tropical islands in the Indo-Pacific region
<p>Species abundance distributions (SADs) characterise the distribution of individuals among species. This dataset was used to investigate the relative importance of disturbance regime (tropical cyclone regime) and island geography (the area and isolation of islands) on the shape of SADs.</p>
Forest biomass in subtropical Andes: Plots data
<p>Forest biomass plays an important role in the global carbon cycle. Therefore, understanding the factors that control forest biomass stocks and dynamics is a key challenge in the context of global change. We analyzed data from 60 forest plots in the subtropical Andes (22-27.5° S and 300-2300 m asl) to describe patterns and identify drivers of aboveground biomass (AGB) stocks and dynamics. We found that AGB stocks remained roughly constant with elevation due to compensating changes in basal area (which increased with elevation) and plot-mean wood specific gravity (which decreased with elevation). AGB gain and loss rates both decreased with elevation and were explained mainly by temperature and rainfall (positive effects on both AGB gains and losses). AGB gain was also correlated with forest use history and weakly correlated with forest structure. Mean annual temperature and rainfall showed minor effects on AGB stocks and AGB change (gains minus losses) over recent decades. Although AGB change was only weakly correlated with climate variables, increases in AGB gains and losses with increasing rainfall – together with observed increases in rainfall in the subtropical Andes – suggest that these forests may become increasingly dynamic in the future.</p>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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