Biomass surveys conducted each fall from 2015 to 2018 at the Global Change Research Wetland (GCREW) marsh, Corn Island, Bear Neck Creek, and other tidal wetland sites located at the Smithsonian Environmental Research Center in Edgewater, Maryland. Biomass measurements include allometry and percent cover classes.
| Start date | End date |
|---|---|
| 2015-10-30 | 2018-10-03 |
| Rank name | Value |
|---|---|
| Species | Amaranthus cannabinus |
| Species | Atriplex patula |
| Species | Baccharis halimifolia |
| Species | Distichlis spicata |
| Species | Hibiscus moscheutos |
| Species | Hydrocotyle umbellata |
| Species | Iva frutescens |
| Species | Juniper communis |
| Species | Juniperus virginiana |
| Species | Kosteletzkya virginica |
| Species | Limonium carolinianum |
| Species | Morella cerifera |
| Species | Panicum dichotomoflorum |
| Species | Panicum virgatum |
| Species | Peltandra virginica |
| Species | Phragmites australis |
| Species | Pluchea odorata |
| Species | Polygonum hydropiperoides |
| Species | Rhynchospora rariflora |
| Species | Sagittaria latifolia |
| Species | Samolus valerandi |
| Species | Schoenoplectus americanus |
| Species | Schoenoplectus robustus |
| Species | Smilax rotundifolia |
| Species | Solidago sempervirens |
| Species | Spartina alterniflora |
| Species | Spartina cynosuroides |
| Species | Spartina patens |
| Species | Symphyotrichum lanceolatum |
| Species | Symphyotrichum tenuifolium |
| Species | Typha angustifolia |
| attribute name | definition | format, unit or codes |
|---|---|---|
| site | Site in which transects were located | |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| latitude | Latitude in decimal degrees, World Geodetic System 1984 | degree |
| longitude | Longitude in decimal degrees, World Geodetic System 1984 | degree |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| fractional_cover | Midpoint of fractional cover class (Braun Blonquet) of live plant matter | dimensionless |
| flag | Error or note for species composition | |
| species_comp_notes | Additional notes for species composition |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| area | Area of sampling plot | squareMeter |
| bare_ground | Midpoint of fractional cover class (Braun Blonquet) of bare ground | dimensionless |
| leaf_litter | Midpoint of fractional cover class (Braun Blonquet) of fallen leaf litter | dimensionless |
| standing_dead | Midpoint of fractional cover class (Braun Blonquet) of still standing dead plant material (not species specific) | dimensionless |
| open_water | Midpoint of fractional cover class (Braun Blonquet) of any water in the plot (tides excluded--only ponding/holes) | dimensionless |
| wrack | Midpoint of fractional cover class (Braun Blonquet) of anything else in plots (fallen branch, things washed in on tide, etc) | dimensionless |
| sampled | Indicates whether plot had herbaceous biomass to sample/was sampled | yes = plot was sampled for herbaceous biomass no = plot was not sampled for herbaceous biomass. |
| environment_notes | Additional notes for environmental cover |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| mass | Mass of dried herbaceous sample | gram |
| biomass_notes | Additional notes for harvested biomass | |
| total_biomass | Estimated biomass per plot, either from scaling harvest, or applying allometric equations. | gramsPerSquareMeter |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| stem1_hgt | Height of stem | centimeter |
| stem1_basal | Diameter of stem at base of stem | millimeter |
| stem1_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem2_hgt | Height of stem | centimeter |
| stem2_basal | Diameter of stem at base of stem | millimeter |
| stem2_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem3_hgt | Height of stem | centimeter |
| stem3_basal | Diameter of stem at base of stem | millimeter |
| stem3_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| total_biomass | Estimated biomass per plot, either from scaling harvest, or applying allometric equations. | gramsPerSquareMeter |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| bush | Identifies how many bushes were in the plot, and which bush these measurements are for | dimensionless |
| hgt | Height of the bush measured as overall height | centimeter |
| live_count | Number of live stems on the bush | number |
| dead_count | Number of dead stems on the bush | number |
| diam_1 | Diameter of one stem (to use for allometric biomass equation) | millimeter |
| diam_1_flag | Code indicating whether branch was live or dead. | live = branch is alive dead = branch is dead. |
| diam_2 | Diameter of one stem (to use for allometric biomass equation) | millimeter |
| diam_2_flag | Code indicating whether branch was live or dead. | live = branch is alive dead = branch is dead. |
| diam_3 | Diameter of one stem (to use for allometric biomass equation) | millimeter |
| diam_3_flag | Code indicating whether branch was live or dead. | live = branch is alive dead = branch is dead. |
| diam_4 | Diameter of one stem (to use for allometric biomass equation) | millimeter |
| diam_4_flag | Code indicating whether branch was live or dead. | live = branch is alive dead = branch is dead. |
| diam_5 | Diameter of one stem (to use for allometric biomass equation) | millimeter |
| diam_5_flag | Code indicating whether branch was live or dead. | live = branch is alive dead = branch is dead. |
| crown_1 | Diameter of bush crown cover (one direction/radius) | centimeter |
| crown_2 | Diameter of bush crown cover (one direction/radius) | centimeter |
| bush_health | Indicates whether bush was alive or dead (or a mix) | |
| total_biomass | Estimated biomass per plot, either from scaling harvest, or applying allometric equations. | gramsPerSquareMeter |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| stem1_hgt | Height of stem | centimeter |
| stem1_basal | Diameter of stem at base of stem | millimeter |
| stem1_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem2_hgt | Height of stem | centimeter |
| stem2_basal | Diameter of stem at base of stem | millimeter |
| stem2_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem3_hgt | Height of stem | centimeter |
| stem3_basal | Diameter of stem at base of stem | millimeter |
| stem3_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem5_hgt | Height of stem | centimeter |
| stem5_basal | Diameter of stem at base of stem | millimeter |
| stem5_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem6_hgt | Height of stem | centimeter |
| stem6_basal | Diameter of stem at base of stem | millimeter |
| stem6_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem7_hgt | Height of stem | centimeter |
| stem7_basal | Diameter of stem at base of stem | millimeter |
| stem7_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| stem8_hgt | Height of stem | centimeter |
| stem8_basal | Diameter of stem at base of stem | millimeter |
| stem8_40cm | Diameter of stem at 40 cm above ground (knee height) | millimeter |
| total_biomass | Estimated biomass per plot, either from scaling harvest, or applying allometric equations. | gramsPerSquareMeter |
| attribute name | definition | format, unit or codes |
|---|---|---|
| species_code | Code indicating plant family, or genus and/or species | |
| family | Plant family | |
| genus | Plant genus | |
| species | Plant species | |
| authority | Authority describing genus and species |
| attribute name | definition | format, unit or codes |
|---|---|---|
| year | Year samples were collected | nominalYear |
| month | Month samples were collected | nominalMonth |
| day | Day samples were collected | nominalDay |
| transect | Transect at site in which plots were located | |
| plot | 1 by 1 meter plots along a transect | dimensionless |
| species_code | Code indicating plant family, or genus and/or species | |
| area | Area of sampling plot | squareMeter |
| method | Method used to estimate total biomass | harvest = biomass was estimated directly by harvesting allometry = biomass was estimated indirectly using allometric equations. |
| total_biomass | Estimated biomass per plot, either from scaling harvest, or applying allometric equations. | gramsPerSquareMeter |
| unit name | parent SI unit | unit type | description |
|---|---|---|---|
| nominalMonth | second | time | one month excluding leap seconds and leap days, 2628000 seconds |
This dataset is listed under a Creative Commons BY 4.0 and can be used with attribution. https://creativecommons.org/licenses/by/4.0/