DOI: 10.5281/zenodo.15180620
title: Database of the blue carbon inventory in Spain and Portugal. Organic carbon biomass and soil stocks and sequestration rates to the soil.

description: This database is a compilation of published and unpublished data used to estimate (i) the organic carbon biomass stocks, (ii) the soil organic carbon stock, and (iii) the rates of organic carbon sequestration to the soil associated to Spanish and Portuguese seagrass meadows and salt marshes.

The database is presented in five .csv files. Specific .csv files content:

 

1) General Information:

Site ID: ID of the location where the samples were collected

Locality: Locality where the samples were collected

Region: Spanish or Portuguese region where the samples were collected

Coast: Spanish or Portuguese coast where the samples were collected

Ecosystem: Type of blue carbon ecosystem

Predominant Species: Predominant species at the sampling location

Tidal Range: Tidal range at the sampling location. Intertidal and subtidal for seagrass meadows and Low, Medium, High and Microtidal for Salt Marshes

Sampling Year (yr): Year in which the sample was collected

Latitude (decimal degrees, WGS84): Latitude of sampling station. 

Longitude (decimal degrees, WGS84): Longitude of sampling station.

Water Depth (m): Water column depth at sampling station

Reference: Publications where the data has been used

Researcher: Name of the person responsible for the data.

Contact: Email contact of person responsible for the data.

 

2) Biomass:

Site ID: ID of the location where the samples were collected

Sample ID: ID of the sample

Ecosystem: Type of blue carbon ecosystem

Species: Predominant species at the sampling location

Month:  Month of the year in which the sample was collected

Abovegr DW (km m-2): Aboveground biomass dry weight

Abovegr sd (km m-2): Standard deviation of the aboveground biomass dry weight

Abovegr (n): Number of samples of the aboveground biomass dry weight

Belowgr DW (km m-2): Belowground biomass dry weight

Belowgr sd (km m-2): Standard deviation of the belowground biomass dry weight

Belowgr (n): Number of subsamples of the belowground biomass dry weight

 

3) Soil:

Site ID:  ID of the location where the samples were collected

Core ID: ID of the soil core

Ecosystem: Type of blue carbon ecosystem

Dominant Species: Predominant species at the sampling location

Tidal Range (m): Tidal range at the sampling location. Intertidal and subtidal for seagrass meadows and Low, Medium, High and Microtidal for Salt Marshes

Year of sampling (yr): Year in which the sample was collected

Core Compression (%): Percentage of compression due to core extraction

Min depth (compacted,  cm): Start depth of the sediment interval. Uncorrected for compression.

Max depth (compacted, cm): End depth of the sediment interval. Uncorrected for compression.

Dry Weight (g dw): Mass of dried sediment

Dry bulk density (g dw cm-3): Mass of dried sediment to the total volume

Organic matter (% dw): Percentage of organic matter in the sediment sample (based on dry weight)

Organic carbon (% dw): Percentage of organic carbon in the sediment sample (based on dry weight)

Estimated Age (years from sampling): Estimated age of the sediment

Raw dates: Dates used to estimate age of the sediment

Dating method: Dating method

 

4) OC Plant:

Site ID: ID of the location where the samples were collected

Sample ID: ID of the sample

Ecosystem: Type of blue carbon ecosystem

Species: Predominant species at the sampling location

Tissue: Tissues used to estimate the carbon content

TOC (%): Percentage of carbon in the plant sample (based on dry weight)

TOC sd: Standard deviation of the percentage of carbon in the plant sample (based on dry weight)

 

5) Published: published data from the studied categories (Posidonia oceanica, Zostera marina, Zostera noltii, Cymodocea nodosa, and Low, Medium, High and Microtidal salt marshes) from outside Spain and Portugal

Ecosystem: Type of blue carbon ecosystem

Tidal Range: Tidal range at the sampling location. Intertidal and subtidal for seagrass meadows and Low, Medium, High and Microtidal for Salt Marshes 

Genus: Predominant genus

Species: Predominant species at the sampling location

Seagrass type: Seagrass type following the classification of Kilminster et al. 2015 (https://doi.org/10.1016/j.scitotenv.2015.04.061): Persistent, classification and opportunistic.

Latitude (decimal degrees, WGS84): Latitude of sampling station. 

Longitude (decimal degrees, WGS84): Longitude of sampling station.

Abovegr DW (kg dw m-2): Aboveground biomass dry weight

Abovegr OC stock (kg dw OC m-2): Organic carbon stock in the aboveground biomass

SE Abovegr OC stock (kg dw OC m-2): Standard error of the aboveground biomass organic carbon stock

SD Abovegr OC stock (kg dw OC m-2): Standard deviation of the aboveground biomass organic carbon stock

Abovegr OC stock n: Number of subsamples of the aboveground biomass organic carbon stocks

Soil Stock 1m (kg dw OC m-2): Soil organic carbon stocks at 1m depth

SE Soil Stock 1m (kg dw OC m-2): Standard error of the soil organic carbon stocks at 1m depth

SD Soil Stock 1m (kg dw OC m-2): Standard deviation of the soil organic carbon stocks at 1m depth

Soil Stock (n): Number of cores used to estimate the soil organic carbon stocks at 1m depth

OC sequestration rate (kg dw OC m-2 yr-1): Average organic carbon sequestration rates

OC sequestration rate SE (kg dw OC m-2 yr-1): Standard error of the average organic carbon sequestration rates

Time frame (years): Time frame used to estimate the average organic carbon sequestration rates

OC sequestration rate last 100 years (kg dw OC m-2 yr-1): Average organic carbon sequestration rates in the last 100 years

OC sequestration rate last 100 SE (kg dw OC m-2 yr-1): Standard error of the average organic carbon sequestration rates in the last 100 years

OC sequestration rate last 100 (n): Number of cores used to estimate the average organic carbon sequestration rates in the last 100 years

Reference: DOI of the data origin