----- GENERAL INFORMATION ----- DATA TITLE: Files accompanying "Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus" PROJECT TITLE: Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus DATA ABSTRACT: Here, we present data files including a datalogger code and example datafile, an r script to clean the datafile, and the full cleaned gas flux dataset to accompany the publication "Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus". AUTHORS: Author: Nathaniel C. Lawrence ORCID: 0000-0001-6775-514X Institution: Iowa State University Email: natelaw@iastate.edu Author: Steven J. Hall ORCID: 0000-0002-5366-8931 Institution: Iowa State University Email: stevenjh@iastate.edu Corresponding author: stevenjh@iastate.edu ASSOCIATED PUBLICATIONS: Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus, Nathaniel C. Lawrence and Steven J. Hall, Atmospheric Measurement Techniques, 2020, https://doi.org/10.5194/amt-2020-36. COLLECTION INFORMATION: Time period(s): February 2017 - October 2019 Location(s): The gas flux data was collected near 41.98° N, 93.69° W. ----- FILE DIRECTORY ----- ----- FILE LIST----- A. Files accompanying Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus A.a. Full_Soil_Gas_Flux_Dataset.csv - A dataset of plot location, soil nitrous oxide, and soil carbon dioxide fluxes required to create the statistics and plots present in the accompanying publication. Flux values are rounded to two digits. Occasionally, near-zero values rounded to zero. Therefore, zeros represent true zero values and not null values. A.b. Data_Codebook_For_Full_Gas_Flux_Dataset.csv - An ANSI encoded codebook that defines and describes variables in the Full_Soil_Gas_Flux_Dataset.csv A.c. Example_Datalogger_Program.CR3 - An example datalogger program in the Campbell Scientific, Logan UT file format which operates a Campbell CR3000 as described in the accompanying publication. The program can be opened in a text editor to read and preview the code and comments. A.d. Example_Cleaning_Code - An example R script used to clean data stored on the Campbell CR3000 running the program provided in the Example_Datalogger_Program.CR3 A.e. Example_Dataset.csv - An example dataset which accompanies the example cleaning code. Do not open or save the file with Microsoft Excel, the resulting file will be missing critical time information. The data is presented as a .csv file created from the .dat file downloaded from the Campbell CR3000 datalogger. ----- CODEBOOK ----- A specific codebook is provided for the Full_Gas_Flux_Dataset.csv and is found in A.b. in the file list above. ----- METHODS AND MATERIALS ----- Text is paraphrased from "Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus, Nathaniel C. Lawrence and Steven J. Hall, Atmospheric Measurement Techniques, 2020, https://doi.org/10.5194/amt-2020-36". More details can be found in the publication. Soil greenhouse gas chambers were located at eight plots on approxamately 17 m intervals along a topographic gradient in a conventionally managed corn–soybean (Zea mays–Gycine max) agricultural field in central Iowa, USA (41.98° N, 93.69° W). The transect spanned 120 linear m (Fig. 1a), 2.25 m elevation, and included very poorly to moderately poorly drained soils (Mollisols classified as Okoboji to Clarion series under the USDA taxonomy). Chambers were placed immediately adjacent to crop plants; due to frequent tillage and herbicide application, recruitment of other plants inside the chamber collars was uncommon, but any plants were removed from the chamber interiors as soon as they were observed. Roots from crop plants were not excluded and likely grew beneath chambers. ----- DATA COLLECTION METHODS ----- Text is paraphrased from "Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus, Nathaniel C. Lawrence and Steven J. Hall, Atmospheric Measurement Techniques, 2020, https://doi.org/10.5194/amt-2020-36". More details can be found in the publication. The chambers we utilized were constructed in-house and various aspects were modified from previously published methods. ----- DATA PROCESSING METHODS ----- Data was collected and recorded by a Campbell Scientific CR3000 datalogger (Logan, UT). An example program used to operate the datalogger and store raw data is provided in A.c. above. We also provide an example of both raw data (A.e) and a coinciding cleaning code (A.d). The flux data reported (A.a) is the product of many similar raw datafile and cleaning codes. Specific values within the cleaning code, such as the concentration of the standard gases that we used to calibrate the analyzers were adjusted in each cleaning code. ------- SOFTWARE ------- Name: Loggernet Version: 4.5 System Requirements: Windows 7,8,10 URL:https://www.campbellsci.com/loggernet Developer: Campbell Scientific -Logan UT Additional Notes: The loggernet language Campbell Basic was used to operate our datalogger. The custom program is supplied in A.c. above. Name: R Project for Statistical Computing Version: 3.6.1 System Requirements: Windows 10 /8.1/8 /7 /Vista /XP /2000 Windows Server 2019 /2016 /2012 /2008 /2003 URL:https://cran.r-project.org/bin/windows/base/old/3.6.1/ Developer: R Core Team Additional Notes: R was used for data cleaning. The cleaning code is supplied in A.d. above. ------- EQUIPMENT ------- Manufacturer:Campbell Scientific Model: CR3000 Embedded Software/Firmware Name: Loggernet Embedded Software/Firmware Version: 4.5 Additional equipment used, along with manufacturer, manufacturer identification numbers, and the item price at the time of publication can be found in the associated publication "Capturing temporal heterogeneity in soil nitrous oxide fluxes with a robust and low-cost automated chamber apparatus, Nathaniel C. Lawrence and Steven J. Hall, Atmospheric Measurement Techniques, 2020, https://doi.org/10.5194/amt-2020-36". ------- Licensing ------- This work is licensed under the Creative Commons Attribution (CC-BY) 4.0 International License. For more information visit: https://creativecommons.org/licenses/by/4.0