This dataset was used as part of a continent-wide analysis of tree fecundity and its association with climate and tree size. This dataset consists of: plotinfo.csv, which contains basic attribute information for the field plots where the data were collected; seeddata.csv, which contains the data for seeds collected (how many, what type, etc.); trapxycoord.csv, which contains location and identification information for the seed traps used to collect the seeds; treexycoord.csv, which contains location and attribute information for the standing trees in the plot where the seeds were collected; and treedata.csv, which contains data on the size and species of standing trees in the plot where the seeds were collected.

These tables include data from 25 long-term forest plots located in either Sequoia or Yosemite national park. Trees in these plots (established between 1982 and 2001) are censused annually for mortality and measured for diameter every 4 to 6 years. Plots were mostly 1 hectare (ha) in size (range 0.9 – 2.5 ha) and contained at least two 25 by 25 meter seedling sub-plots to monitor natural seedling recruitment. The largest plot, at 2.5 ha, included four such seedling sub-plots. Each sub-plot was divided into 5 by 5 meter quadrats. In almost all the plots these seedling sub-plots were established in 1999, but four plots (those with names starting with FF) were added to the study in 2002 and seedling data was only available from this date. Seedlings taller than 10 centimeters (which were at least 3 years old) were given numbered tags so that their survival and height class could be recorded individually. If there were more than 20 seedlings per quadrat of a species entering the greater-than-10 centimeters category, a sample of 20 was tagged, but this was unusual. Individual-level mortality and growth could be tracked for these seedlings. In each annual seedling census, the presence of the tagged seedling (live or dead) was recorded and it was assigned to a height category (10-25 cm, 25-50 cm, 50-75 cm, 75-100 cm, and 100-137 cm). Those that grew to 137 centimeters (tall enough to record a diameter-at-breast height (DBH)) were re-tagged as trees. This release contains 2 CSV and 3 TXT files: TaggedSdl.txt, PlotInfogeneral.txt, quadrat_precise.csv, treedata.csv, and treeyears.txt.

These tables include data from 25 long-term forest plots located in either Sequoia or Yosemite national park. Trees in these plots (established between 1982 and 2001) are censused annually for mortality and measured for diameter every 4 to 6 years. Plots were mostly 1 hectare (ha) in size (range 0.9 – 2.5 ha) and contained at least two 25 by 25 meter seedling sub-plots to monitor natural seedling recruitment. The largest plot, at 2.5 ha, included four such seedling sub-plots. Each sub-plot was divided into 5 by 5 meter quadrats. In almost all the plots these seedling sub-plots were established in 1999, but four plots (those with names starting with FF) were added to the study in 2002 and seedling data was only available from this date. Seedlings taller than 10 centimeters (which were at least 3 years old) were given numbered tags so that their survival and height class could be recorded individually. If there were more than 20 seedlings per quadrat of a species entering the greater-than-10 centimeters category, a sample of 20 was tagged, but this was unusual. Individual-level mortality and growth could be tracked for these seedlings. In each annual seedling census, the presence of the tagged seedling (live or dead) was recorded and it was assigned to a height category (10-25 cm, 25-50 cm, 50-75 cm, 75-100 cm, and 100-137 cm). Those that grew to 137 centimeters (tall enough to record a diameter-at-breast height (DBH)) were re-tagged as trees. This release contains 2 CSV and 3 TXT files: TaggedSdl.txt, PlotInfogeneral.txt, quadrat_precise.csv, treedata.csv, and treeyears.txt.

These datasets provide spatially-explicit estimates of the magnitude of giant sequoia foliage dieback along selected trail corridors in Sequoia and Kings Canyon national parks, California, from 2014 through 2017. They additionally provide giant sequoia tree-ring measurements, through the year 1989, for two locations in the Giant Forest grove, Sequoia National Park, California. These data support the following publications: Nathan L. Stephenson, Adrian J. Das, Nicholas J. Ampersee, Kathleen G. Cahill, Anthony C. Caprio, John E. Sanders, A. Park Williams, Patterns and correlates of giant sequoia foliage dieback during California’s 2012–2016 hotter drought, Forest Ecology and Management, Available online 7 November 2017, ISSN 0378-1127, https://doi.org/10.1016/j.foreco.2017.10.053. Martin, R. E., G. P. Asner, E. Francis, A. Ambrose, W. Baxter, A. J. Das, N. R. Vaughn, T. Paz-Kagan, T. Dawson, K. Nydick, and N. L. Stephenson. Submitted. Remote measurement of canopy water content in giant sequoias (Sequoiadendron giganteum) during drought. Submitted to special section in Forest Ecology and Management.

These datasets provide spatially-explicit estimates of the magnitude of giant sequoia foliage dieback along selected trail corridors in Sequoia and Kings Canyon national parks, California, from 2014 through 2017. They additionally provide giant sequoia tree-ring measurements, through the year 1989, for two locations in the Giant Forest grove, Sequoia National Park, California. These data support the following publications: Nathan L. Stephenson, Adrian J. Das, Nicholas J. Ampersee, Kathleen G. Cahill, Anthony C. Caprio, John E. Sanders, A. Park Williams, Patterns and correlates of giant sequoia foliage dieback during California’s 2012–2016 hotter drought, Forest Ecology and Management, Available online 7 November 2017, ISSN 0378-1127, https://doi.org/10.1016/j.foreco.2017.10.053. Martin, R. E., G. P. Asner, E. Francis, A. Ambrose, W. Baxter, A. J. Das, N. R. Vaughn, T. Paz-Kagan, T. Dawson, K. Nydick, and N. L. Stephenson. Submitted. Remote measurement of canopy water content in giant sequoias (Sequoiadendron giganteum) during drought. Submitted to special section in Forest Ecology and Management.

This data publication contains tabular data with repeat measurements of tree and shrub data for a set of transects located in Stanislaus National Forest (STF) and Yosemite National Park (YOSE) in California. These transects represent part of a systematic timber inventory collected across a large mixed-conifer dominated landscape by the U.S. Forest Service in 1911. Trees were tallied by species, diameter and height within 40 x 400 meter (m) strips that spanned the center of quarter-quarter sections (QQs) delineated by the Public Land Survey System. Shrub cover was determined using an ocular estimate. Repeat data were collected in either 2005, 2007 or 2013 in three to four 0.1 hectare circular plots (radius 17.8 m) per transect, centered at random, non-overlapping distances along the historical transect centerline. This data publication therefore contains measurements such as the percentage cover of shrubs for multiple species, basal area of dead and live conifer trees, and density of live conifer trees with various diameters at breast height for both STF and YOSE in 1911 and the remeasurement year of 2005, 2007, or 2013.

These data were converted from the originally delivered Microsoft Access PLOTs database from the Vegetation Mapping Inventory Project of Sequoia and Kings Canyon National Parks. These comma-delimited data tables contain(s) vegetation mapping plot classification and accuracy assessment data, as well as summary information about the data itself. If a table is empty, then it was empty in the original database.

These data were converted from the originally delivered Microsoft Access PLOTs database from the Vegetation Mapping Inventory Project of Sequoia and Kings Canyon National Parks. These comma-delimited data tables contain(s) vegetation mapping plot classification and accuracy assessment data, as well as summary information about the data itself. If a table is empty, then it was empty in the original database.

Provided are data containing condition assessments on individual giant sequoia (Sequoiadendron giganteum; SEGI) stems and post-fire regeneration counts within Board Camp, Suwanee, New Oriole Lake, Homer’s Nose, and a subset of Redwood Mountain and Dillonwood groves of Sequoia and Kings Canyon national parks, respectively. Stem data contain condition-related attributes (e.g., spatial location, diameter breast height, status - live or dead, percent canopy that is live, scorched or torched). Regeneration plots are located using a spatially-balanced sampling design (Generalized Random Tessellation Stratified - 'GRTS'). Each regeneration plot is a fixed radius circle (11.35 meters or 17.84 meters) and contain count data of giant sequoia seedlings.

Provided are data containing condition assessments on individual giant sequoia (Sequoiadendron giganteum; SEGI) stems and post-fire regeneration counts within Board Camp, Suwanee, New Oriole Lake, Homer’s Nose, and a subset of Redwood Mountain and Dillonwood groves of Sequoia and Kings Canyon national parks, respectively. Stem data contain condition-related attributes (e.g., spatial location, diameter breast height, status - live or dead, percent canopy that is live, scorched or torched). Regeneration plots are located using a spatially-balanced sampling design (Generalized Random Tessellation Stratified - 'GRTS'). Each regeneration plot is a fixed radius circle (11.35 meters or 17.84 meters) and contain count data of giant sequoia seedlings.