Data Package Metadata View Summary

Nevada Desert FACE Facility Soil Organic Carbon Data

General Information

Data Package:

Local Identifier:

edi.1200.1

Title:

Nevada Desert FACE Facility Soil Organic Carbon Data

Alternate Identifier:

DOI PLACE HOLDER

Abstract:

This data set is the result of soils analysis from the Nevada Desert Free-Air CO2 Enrichment Facility (NDFF) experiment in the Mojave Desert and reports soil organic carbon (%C) and delta 13C stable isotope values. These soils were collected at the end of the NDFF experiment in 2007 and stored at Cornell University until analysis in 2018. Soils were harvested from 6 cover types (5 perennial vegetation covers and unvegetated interspace soils) from 0-100 cm in the soil profile in 20 cm increments. Soils were pretreated for inorganic carbon removal using an acid fumigation technique with HCl. Bulk density from NDFF plots is provided (kg soil* ha ^ -1) so that SOC stocks may be calculated. These data provide the basis for a publication challenging the prevailing idea that arid ecosystems will increase soil organic carbon stocks under long term elevated CO2.

Publication Date:

2022-08-26

For more information:
Visit:	DOI PLACE HOLDER

Time Period

Begin:

1997

End:

2007

People and Organizations
Contact:	Jensen, Jensen H (Skidmore College, Postdoctoral Researcher) [ email ]
Creator:	Jensen, Kelsey H (Cornell University, PhD Candidate)
Creator:	Sparks, Jed P (Cornell University, Professor)
Associate:	Guinness, Joe (Cornell University, Assistant Professor, Statistician)

Data Entities
Data Table Name:	NDFF_SOC_Data
Description:	Soil organic carbon %C and 13C raw data and bulk density information from samples harvested in 2007 at the Nevada Desert Free Air Carbon Dioxide Enrichment Facility. Samples are from 6 cover types and 5 depths (0-100 cm in 20 cm increments) across the 3 control and 3 elevated CO2 plots. Some samples could not be located at the time of measurements (i.e. Interspace Ring 2 samples for all depths).

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/1200/1/33b78ad34c874cf9bde886229aee7d87
Name:	NDFF_SOC_Data
Description:	Soil organic carbon %C and 13C raw data and bulk density information from samples harvested in 2007 at the Nevada Desert Free Air Carbon Dioxide Enrichment Facility. Samples are from 6 cover types and 5 depths (0-100 cm in 20 cm increments) across the 3 control and 3 elevated CO2 plots. Some samples could not be located at the time of measurements (i.e. Interspace Ring 2 samples for all depths).
Number of Records:	173
Number of Columns:	8

Table Structure

Object Name:

20201027_desert_data.csv

Size:

9427 byte

Authentication:

88c19a13031fb73c32941d97525bb819 Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

depth

ring

treatment

plant

plant_ID

perC

isoC

Column Name:

depth

ring

treatment

plant

plant_ID

perC

isoC

Definition:

depth (cm) of soil sample collected, identified by the middle of the profile (0-20 is labelled as 10)

Plots at NDFF called "rings", 1-3 are elevated CO2 (550 ppm) and 4-6 are ambient CO2

Ambient or elevated CO2 conditions within each ring

Vegetation Cover Type

Each plant within a ring was given a unique identifier to ensure that all soil samples (0-100 cm) used came from the same individual

Percent carbon after pretreatment for removal of soil inorganic carbon

13C stable isotope measurement from soil after pretreatment for inorganic carbon removal

Bulk density (kg soil * ha^-1) specific to each ring and each depth (20 cm increments from 0-100 cm)

Storage Type:

float

string

float

Measurement Type:

ratio

nominal

ratio

Measurement Values Domain:

Unit	centimeter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	1
Definition	Elevated CO2 (550 ppm treatment)
Source

Code Definition

Code	2
Definition	Elevated CO2 (550 ppm treatment)
Source

Code Definition

Code	3
Definition	Elevated CO2 (550 ppm treatment)
Source

Code Definition

Code	4
Definition	Ambient CO2 (control plots)
Source

Code Definition

Code	5
Definition	Ambient CO2 (control plots)
Source

Code Definition

Code	6
Definition	Ambient CO2 (control plots)
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	ambient
Definition	Ambient CO2 (control plots)
Source

Code Definition

Code	elevated
Definition	Elevated CO2 (550 ppm treatment)
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	AMDU
Definition	Ambrosia dumosa
Source

Code Definition

Code	INSP
Definition	Unvegetated Interspace
Source

Code Definition

Code	LATR
Definition	Larrea tridentata
Source

Code Definition

Code	LYAN
Definition	Lycium andersonii
Source

Code Definition

Code	LYPA
Definition	Lycium pallidum
Source

Code Definition

Code	PLRI
Definition	Pleuraphis rigida
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	1
Definition	unique ID for individual plant within each ring
Source

Code Definition

Code	2
Definition	unique ID for individual plant within each ring
Source

Code Definition

Code	3
Definition	unique ID for individual plant within each ring
Source

Unit	percent
Type	real

Unit	permil
Type	real

Unit	Kg/ha
Type	integer

Missing Value Code:

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Package Usage Rights

This data package is released to the "public domain" under Creative Commons CC0 1.0 "No Rights Reserved" (see: https://creativecommons.org/publicdomain/zero/1.0/). It is considered professional etiquette to provide attribution of the original work if this data package is shared in whole or by individual components. A generic citation is provided for this data package on the website https://portal.edirepository.org (herein "website") in the summary metadata page. Communication (and collaboration) with the creators of this data package is recommended to prevent duplicate research or publication. This data package (and its components) is made available "as is" and with no warranty of accuracy or fitness for use. The creators of this data package and the website shall not be liable for any damages resulting from misinterpretation or misuse of the data package or its components. Periodic updates of this data package may be available from the website. Thank you.

Keywords

By Thesaurus:
(No thesaurus)	Mojave Desert, Arid Ecosystem, Soil organic carbon, Elevated CO2, Global change, stable isotope, FACE

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Soils were pretreated for soil inorganic carbon removal by fumigation of HCl. Briefly, soils were weighed at 20 mg directly into silver capsules on a microbalance (Sartorius Cubis, Germany) and placed in a 96 well plate. Approximately 10 uL of DI water was added to each sample. The well-plate was then placed in a vacuum desiccator along with two open 100 mL beakers of 12 M HCl. The desiccator was sealed with silicon grease to avoid contamination associated with organic sealants (Schubert & Nielsen, 2000). The desiccator was placed under vacuum using a hand-held vacuum pump and then closed. Samples were fumigated for 24 hours. After removal from the desiccator, well-plates were dried at 60C for 24 hours, then double wrapped in tin before dry combustion.

Instrument(s):

All samples were analyzed for δ13C and %C using a continuous flow isotope ratio mass spectrometer (IR‐MS; Model V Advantage; Thermo Scientific, Bremen, Germany) and elemental analyzer (Thermo Finnigan Carlo Erba NC2500). Isotope ratios are expressed as δ values (per mil): δ13C = (Rsample/Rstandard−1) × 1000 (‰) where Rsample and Rstandard are the ratios of heavy to light isotope of the sample relative to the international standard Vienna-Pee-Dee Belemnite. All isotopic analyses were completed at the Cornell University Stable Isotope Laboratory (COIL).

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@edirepository.org

Web Address:

https://edirepository.org

Id:

https://ror.org/0330j0z60

Creators:

Individual:

Kelsey H Jensen

Organization:

Cornell University

Position:

PhD Candidate

Address:

E159 Corson Hall, Tower Rd,

Cornell University,

Ithaca, NY 14853 United States

Email Address:

khj22@cornell.edu

Id:

https://orcid.org/0000-0002-1060-8226

Individual:

Dr. Jed P Sparks

Organization:

Cornell University

Position:

Professor

Address:

E159 Corson Hall, Tower Rd,

Cornell University,

Ithaca, NY 14853 United States

Email Address:

jps66@cornell.edu

Contacts:

Individual:

Jensen H Jensen

Organization:

Skidmore College

Position:

Postdoctoral Researcher

Address:

815 North Broadway,

CIS,

Saratoga Springs, NY 12866

Email Address:

kjensen@skidmore.edu

Id:

https://orcid.org/0000-0002-1060-8226

Associated Parties:

Individual:

Joe Guinness

Organization:

Cornell University

Position:

Assistant Professor

Email Address:

guinness@cornell.edu

Id:

https://orcid.org/0000-0003-0564-6639

Role:

Statistician

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

1997

End:

2007

Sampling Site:

Description:

The Nevada Desert FACE Facility was located in Nye County, NV, USA, 15 km North of Mercury, NV

Site Coordinates:

Longitude (degree):	-115.92	Latitude (degree):	36.82
Altitude Minimum:	965.0	Altitude Maximum:	970.0

Project

Parent Project Information:

Title:

Examining Contrasting Results for a Single Elevated CO2 Study in the Mojave Desert: Are Arid Ecosystems Accruing Soil Organic Carbon?

Personnel:

Individual:

Jed P Sparks

Organization:

Cornell University

Position:

Professor

Email Address:

jps66@cornell.edu

Role:

Project Lead

Abstract:

Predicting the effects of elevated atmospheric CO2 (eCO2) on soil organic carbon (SOC) is critical to understanding changes to the global carbon cycle. Arid ecosystems have large spatial coverage globally and are known to be a critical component of the global land sink. However, because of low overall organic carbon content, high spatial heterogeneity, and the presence of inorganic carbon, measuring SOC in these environments is challenging. As an example, the intensively studied Nevada Desert Free-Air CO2 Enrichment Facility (NDFF) reports conflicting results regarding the effects of eCO2 on SOC. In this project, we compare our independent analysis of SOC stocks from NDFF and compare the results to the most prominent previous analysis of SOC stocks from the site. We found that eCO2 resulted in losses of SOC under the major plant cover type in this ecosystem but no change in ecosystem SOC stocks due to a lack of treatment effect on SOC in unvegetated soils. This contrasts with a previous analysis of these soils showing a 20% increase in ecosystem SOC stocks (Evans et al., 2014). As of the publication of this data we have not resolved the discrepancy between these two major studies.

Maintenance

Maintenance:

Description:	There is no ongoing maintenance of this data set
Frequency:

Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'unitList'
        |     |     |___text '\n        '
        |     |     |___element 'unit'
        |     |     |     |  \___attribute 'id' = 'Kg/ha'
        |     |     |     |  \___attribute 'name' = 'Kg/ha'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description'
        |     |     |     |     |___text 'Kilograms per hectare'
        |     |     |     |___text '\n        '
        |     |     |___text '\n      '
        |     |___text '\n    '
        |___text '\n  '

Additional Metadata

additionalMetadata
        |___text '\n    '
        |___element 'metadata'
        |     |___text '\n      '
        |     |___element 'emlEditor'
        |     |        \___attribute 'app' = 'ezEML'
        |     |        \___attribute 'release' = '2022.08.24'
        |     |___text '\n    '
        |___text '\n  '

Copyright 2024 Environmental Data Initiative. This material is based upon work supported by the National Science Foundation under grants #2223103 and #2223104. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Please contact us with questions, comments, or for technical assistance regarding this web site or the Environmental Data Initiative. Please read our privacy policy to know what information we collect about you and to understand your privacy rights.

EDI is a collaboration between the University of New Mexico and the University of Wisconsin – Madison, Center for Limnology:

Data Package Metadata View Summary

Nevada Desert FACE Facility Soil Organic Carbon Data

Data Entities

Data Table

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Additional Metadata

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Nevada Desert FACE Facility Soil Organic Carbon Data

+/- Data Entities

Data Table

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

+/- Additional Metadata

+/- Additional Metadata

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Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Metadata

Additional Metadata