cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6073/pasta/32df8f7c7fb9084521e18b1b0974304d
title: Reptile species recorded within the Hubbard Brook Experimental Forest and vicinity (1963-2020; updated January 2021).

description: This dataset contains confirmed observations of reptile species at the
 Hubbard Brook Experimental Forest and adjacent Mirror Lake. The
 original list was published in Holmes, R. T. and G. E. Likens. 1999.
 Organisms of the Hubbard Brook Valley, New Hampshire. USDA Forest
 Service, Northeastern Research Station, General Tech. Report NE-257.
 32 pp. The list is updated here (January 2021) to include additional
 species observed since the original publication, update taxonomic
 classifications, and provide annotations on distribution.
DOI: 10.6073/pasta/25a88a88d698300f899f0a58132423b7
title: Hubbard Brook Experimental Forest: Lichen grazing assessment on valleywide plots

description: Herbivory by terrestrial gastropods, particularly Arion sp. (a
 non-native slug), can alter epiphytic lichen communities; however,
 little is known about this interaction in forests of North America. We
 used surveys of grazing damage to lichen thalli in the field on 52
 plots within Hubbard Brook Experimental Forest, NH. Grazing damage by
 terrestrial gastropods was widespread, though few sites had severe
 grazing. Grazing damage was significantly higher on flatter terrain
 and on broadleaf trees. Overall, lichen communities in the HBEF were
 moderately impacted by terrestrial gastropod grazing, but potential
 effects of the non-native slugs at higher elevations and impacts on
 lichen health of widespread, moderate grazing deserve further study.

 
 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 were analyzed and published in: Clyne, Ailís B, Natalie L
 Cleavitt, and Timothy J Fahey. 2019. “Terrestrial Gastropod Grazing On
 Macrolichens In A Northern Broadleaf–Conifer Forest”. Northeastern
 Naturalist 26(2): 261 - 274.
 https://bioone.org/journals/Northeastern-Naturalist/volume-26/issue-2/045.026.0203/Terrestrial-Gastropod-Grazing-on-Macrolichens-in-a-Northern-BroadleafConifer-Forest/10.1656/045.026.0203.full.
DOI: 10.6073/pasta/f1c35455db94754db3146c1d90f52f54
title: Hubbard Brook Experimental Forest: Seedling bank – watershed 1 and watershed 6 (2018)

description: The understory layer is complex and includes groups of stems with
 distinctly different chances of survival and recruitment to the
 sapling size class. We explored how calcium amendment has impacted the
 trajectory of the seedling bank at Hubbard Brook Experimental Forest.
 The density of all tree stems in the seedling bank in 2018 (19 years
 after treatment) was greater in CAL (Watershed 1; calcium treatment)
 than REF (Waterhsed 6; reference) and beech was more abundant than
 sugar maple in both watersheds. In terms of relative abundance, the
 treatment had the opposite effects on the two species: the relative
 density of sugar maple was significantly greater in CAL than REF while
 the relative density of beech was significantly less. In terms of
 beech stem origin, Beech sprouts were more abundant than seedlings on
 both watersheds; however, beech stems of seed origin were more
 abundant on CAL (mean±1SE: 4.06±0.49 seedlings m-2) than REF
 (2.98±0.42), while sprouts were fewer (CAL: 14.4±1.30; REF: 20.5±1.47)
 resulting in the seedling to sprout ratio on CAL (1:3.5) being half
 that on REF (1:7). The influence on the seedling bank on future
 composition of these forests remains to be seen.

 
 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.
DOI: 10.6073/pasta/ea985022acfdb76cd7beeaf8da6c39b1
title: Black-throated Blue Warbler capture histories, Hubbard Brook Experimental Forest, 1986 - 2010

description: This dataset provides body measurements and encounter
 histories for black-throated blue warblers. Birds were
 captured in mist nets, given unique combinations of colored
 leg bands and a numbered, aluminium USGS leg band, and aged
 as either yearlings or older breeders based on plumage
 characters. Standard body measurements were taken, following
 Pyle 1997 (Pyle, P. 1997. Identification guide to North
 American birds. Slate Creek Press, Bolinas, CA). All birds
 were released unharmed after banding and measurements were
 completed. Capture histories were generated from resightings
 of banded individuals on three gridded study plots at the
 HBEF: low elevation (250-350 m; 85 ha), middle elevation
 (450-600 m; 65 ha), and high elevation (750-850 m; 35 ha).
 See Rodenhouse et al. 2003 for plot details.
 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.
DOI: 10.6073/pasta/fa883c4597bd306c2cec2200b11409ae
title: Depth patterns of gross nitrogen cycling and soil exoenzyme activities for three northern hardwood forests

description: Despite the enormous size of the organic nitrogen (N) pool contained
 in mineral subsoils, rates of N cycling and soil exoenzyme activities
 are rarely measured in soils below 10 or 20 cm depth. Furthermore,
 assumed relationships between N mineralization rates and the
 activities of various decomposition exoenzymes are poorly
 characterized. We measured rates of gross and net N mineralization and
 nitrification as well as the potential activities of hydrolytic and
 oxidative enzymes at five soil depths (forest floor to 50 cm) in
 Spodosols at three hardwood forests of varying age (45 and 100 years
 post-harvest and old growth) at and near the Hubbard Brook
 Experimental Forest in New Hampshire, USA. As expected, rates of N
 cycling and potential enzyme activities per unit soil mass correlated
 strongly with soil carbon (C) concentration, and these parameters
 declined exponentially with increasing soil depth. After normalization
 per unit soil organic matter, N cycling rates and specific enzyme
 activities generally decreased little with depth within the mineral
 soil. Gross N mineralization rates correlated with specific activities
 of those enzymes that hydrolyze cellulose (β-glucosidase,
 cellobiohydrolase) and N-rich glucosamine polymers
 (N-acetylglucosaminidase), but not those that degrade protein or more
 complex C compounds. Hence, gross N cycling appear associated with the
 N released during microbial N recycling, rather than from
 decomposition of soil organic matter. Across the three stands, the
 youngest had a larger ratio of N- to-phosphorus-acquiring enzyme
 activities, indicating a greater N demand in younger than older
 forests. For all three stands, mineral soil below 10 cm contributed
 30–53% of total gross and net N cycling per unit area to 50 cm depth.
 Overall, even though microbial N cycling and enzyme activities per
 unit soil mass decreased with depth, microbial processes in subsoils
 contributed substantially to ecosystem-scale gross N fluxes because of
 the sustained microbial activity per unit soil organic matter at depth
 and the large size of the organic matter pool in the mineral soil.
 These results support the inclusion of often-ignored mineral subsoils
 and microbial N recycling in both ecosystem N budgets and in model
 simulations, due to their contribution to soil N fluxes and the
 importance of microbial N dynamics in forest stands.

 
 An analysis if these data can be found in: Darby, BA, CL Goodale, NA
 Chin, CB Fuss, AK Lang, SV Ollinger, GM Lovett. (2020) Depth patterns
 and connections between gross nitrogen cycling and soil exoenzyme
 activities for three northern hardwood forests.
 https://doi.org/10.1016/j.soilbio.2020.107836

 
 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.
DOI: 10.6073/pasta/74691519e5196a7832d73254b88cba69
title: Chemistry of freely-draining soil solutions at the Hubbard Brook Experimental Forest, Watershed 1, 1996 - present.

description: Tension-free lysimeters were installed in three soil horizons at 13
 locations within Hubbard Brook Experimental Forest Watershed 1,
 representing the variation in elevation and forest type of the
 watershed. At each location, the organic horizon and the B horizon
 were selected for lysimeter placement. Soil solution samples were
 collected approximately monthly and analyzed for base cations, soluble
 anions, trace metals, nitrogen and carbon.

 
 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.
DOI: 10.6073/pasta/3c26b78ca8de3ba3fb79f3fd52d35417
title: Chemistry of freely-draining soil solutions at the Hubbard Brook Experimental Forest, Watershed 6, 1982 - present

description: Tension-free lysimeters were installed in three soil horizons at three
 locations adjacent to Hubbard Brook Experiment Forest Watershed 6. At
 each location, the organic horizon and the B horizon were selected for
 lysimeter placement. Soil solution samples were collected
 approximately monthly and analyzed for base cations, soluble anions,
 trace metals, nitrogen and carbon.

 
 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.
DOI: 10.6073/pasta/256aaeb2c17ac7c36ea7e3d8170a5af3
title: Longitudinal Stream Chemistry at the Hubbard Brook Experimental Forest, Watershed 1, 1991 - present.

description: Longitudinal variation in streamwater chemistry has been measured in
 two watersheds (W1 and W6) at the Hubbard Brook Experimental Forest.
 This dataset includes samples that have been collected approximately
 monthly in Watershed 1 at five sampling locations (1991 – present)
 along an elevational gradient. Samples are analyzed for pH, ANC,
 anions, cations, nitrogen, dissolved inorganic and organic carbon.

 
 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.
DOI: 10.6073/pasta/f4bb35a23b50360800e589647c62a729
title: Longitudinal Stream Chemistry at the Hubbard Brook Experimental Forest, Watershed 6, 1982 - present

description: Longitudinal variation in streamwater chemistry has been measured in
 two watersheds (W1 and W6) at the Hubbard Brook Experimental Forest.
 This dataset includes samples that have been collected approximately
 monthly in Watershed 6 at six sampling locations (1982 – present)
 along an elevational gradient. Samples are analyzed for pH, ANC,
 anions, cations, nitrogen, dissolved inorganic and organic carbon.

 
 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.
DOI: 10.6073/pasta/7ab1863e56f8cc823b3c7f966bc8f43d
title: Gastropod abundance at Hubbard Brook Experimental Forest, Watershed 1 and West of Watershed 6, 1997-2006

description: Snail and slug abundance were measured for a 10 year
 period between 1997 - 2006 at three elevations on Watershed 1
 as well as in a reference area west of Watershed 6. Watershed
 1 received calcium additions as wollastonite (CaSiO3) during
 the study period. This data set includes counts of snails and
 and slugs for the entire study period.
 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.
DOI: 10.6073/pasta/20d71ae207faaa882a0893e9d878db27
title: Chemistry of rainfall and throughfall from El Verde and Bisley

description: Rain, throughfall, and stream water are collected weekly at the LEF sites listed below. Samples are collected by USDA Forest Service technicians Carlos Estrada in the field filtered in the lab by Miriam Salgado. These data sets begin as early as 1983; LTER sampling began in 1988. Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No event sampling is conducted on a routine basis. Rain samples from WDEV are wet only from an automatically-closing collector that prevents any dry deposition (Aerochem Metrics NADP collector). RCEV and RCB are bulk or always-open collectors that receive dry deposition by sedimentation. All samples are measured for pH and conductivity, and then filtered (pre-combusted Whatman GF/F glass fiber filter) prior to further analysis. From 1983-1994 samples were cooled and returned to the San Juan chemistry laboratory for analysis. During those years, samples for NH4 and NO3 analyses were refrigerated continuously until analysis. Subsamples for NH4 analysis were also preserved with 1 molar H2SO4. From 1994 on, samples for NH4 and NO3 were frozen until analysis, were not acidified, and all analyses were conducted at the University of New Hampshire. Rain and Throughfall Sampling SitesDescriptions of LTER LUQ rain and throughfall weekly sample chemistry data from 1988 onwards. Chemical concentrations are recorded as mg/L or ug/L as appropriate. Values below detection limits are recorded as 1/2 the detection limit. Site Abbreviation Description Comments Rain collector Bisley. RCB Bulk collector. Rain collector El Verde  RCEV  Bulk collector. Wet/dry El Verde. WDEV. Wet only collector. Throughfall Bisley. TFB=TCB TF bulk 10-collector composite Bisley gap= BGAP, TF bulk 10-collector composite
 
 Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
DOI: 10.6073/pasta/a5a2bbdee8f801c7c9a57d2b20b2f75b
title: Hubbard Brook Experimental Forest: Log decomposition sensor data

description: This data set documents the temporal and spatial variation of soil and deadwood moisture, and nearby microclimate, for the a four-month period from June to October 2018. 
 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 main
tained by the USDA Forest Service, Northern Research Station.
DOI: 10.6073/pasta/074466a3e684220adb4ce15e8e43d280
title: Forest Inventory of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest

description: 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.
DOI: 10.6073/pasta/86d055125f1128290a637dcab45ae167
title: Ice thickness measurements from the Ice Storm Experiment (ISE) at the Hubbard Brook Experimental Forest

description: An ice storm simulation was performed at the Hubbard Brook
 Experimental Forest to evaluate impacts of these extreme weather
 events on northern hardwood forests. Water was pumped from the main
 branch of Hubbard Brook and sprayed above the forest canopy in
 subfreezing conditions so that it rained down and froze on contact
 with trees. The experiment consisted of five treatments, including a
 control (no ice) and three target levels of radial ice accretion: low
 (6.4 mm), mid (12.7 mm), and high (19.0 mm). Two of the mid-level
 treatment plots (midx2) were iced in back-to-back years to evaluate
 impacts of consecutive storms. The ice accretion values reported are
 measurements made on passive collectors using both digital calipers
 and a water volume approach.

 
 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.
DOI: 10.6073/pasta/834eb91736ed5f4a5e080494622354a3
title: Ice Storm Experiment (ISE) Canopy Structure Data, 2015-present

description: To evaluate the effects of ice storm disturbance on forest canopy
 structure and complexity terrestrial lidar data were collected within
 the Hubbard Brook Ice Storm Experiment plots starting in 2015 (prior
 to ice treatment) and annually thereafter. Data were collected using a
 ground-based portable canopy lidar (PCL) system during the growing
 season in August of each year along 5 permanently marked 30 m
 transects in each 20 x 30 m ISE plot.

 
 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.
DOI: 10.6073/pasta/156341bcc10b6a96dcfacf8c11d35be0
title: Throughfall water volume and chemistry from the Ice Storm Experiment (ISE) at the Hubbard Brook Experimental Forest

description: An ice storm simulation was performed at the Hubbard Brook
 Experimental Forest to evaluate impacts of these extreme weather
 events on northern hardwood forests. Water was pumped from the main
 branch of Hubbard Brook and sprayed above the forest canopy in
 subfreezing conditions so that it rained down and froze on contact
 with trees. 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. The volume and chemistry of throughfall was quantified and
 fluxes of major elements were calculated.

 
 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.
DOI: 10.18434/mds2-3087
title: Data for "Multi-frequency Antenna Metrology with Sparse Measurements", to be submitted to IEEE Transactions on Antennas and Propagation or IEEE Transactions on Signal Processing.
DOI: 10.6073/pasta/dc5880a6956f0cdd706d1c13b13e23c3
title: Hubbard Brook Experimental Forest: Total Daily Precipitation by Watershed, 1956 - present

description: From 1956 to 2014, watershed precipitation was estimated using the Thiessen Means weighting method. Daily watershed precipitation values were a weighted average of daily precipitation from standard gauges in or near the watershed. The weighting factor for each gauge was the fraction of the watershed area nearest that gauge. Beginning in 2015, a similar system was implemented using the 10 remaining rain gauges, however Inverse Distance Weighting was used to estimate the weighting of each gauge instead of the Theissen polygon approach. These data were gathered at the Hubbard Brook Experimental Forest in Thornton, NH, which is operated and maintained by the USDA Forest Service, Northern Research Station.
DOI: 10.6073/pasta/4eab26a01233f2404a36e4322dc844bb
title: Measurements of gross N cycling rates in the soils of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest

description: 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.
DOI: 10.6073/pasta/5f7a351e64dc4c0dc06bb8ff14edf245
title: Measurements of N cycling dynamics in the soils of the Ice Storm Experiment (ISE) plots at the Hubbard Brook Experimental Forest

description: 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.
DOI: 10.6073/pasta/fdbcdcd754d9dcc3788b4acfe0ee0b23
title: Hubbard Brook Experimental Forest: soil, litter, plant and microbial attributes on mycorrhizae litter decomposition plots

description: 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.