Title: Data from: Linking agricultural diversification practices, soil arthropod communities, and soil health DOI: 10.7923/rcbw-kx90 Data, code and/or products within this dataset support the following manuscript: Manuscript Title: Linking agricultural diversification practices, soil arthropod communities, and soil health Journal: Journal of Applied Ecology DOI: 10.1111/1365-2664.14453 Description/Abstract: These data are associated with the manuscript "Linking agricultural diversification practices, soil arthropod communities, and soil health". Data were collected from the strip plots associated with the Landscapes in Transition Project (www.pnwlit.org). We used these data to evaluate the effects of agricultural diversification through rotation on soil arthropods and soil properties using replicated large-plot field studies representing two climatically distinct agroecological classes in the dryland cereal-growing region of the inland Pacific Northwest, USA. We investigated how different three-year annual crop rotations affected soil arthropod biodiversity and community structure. Treatments reflected “business-as-usual” rotations in dryland systems and diversified rotations achieved by incorporating novel winter pea or forage crops. We also assessed relationships between the Soil Biological Quality index (QBS-ar), which uses soil arthropods as bioindicators of soil health, and other biological and physiochemical soil health indicators. We collected 710 community samples with 82,509 arthropod specimens across 66 taxa. Novel crops in diversified rotations promoted soil arthropod abundance and biodiversity relative to crops they could replace in rotation. Crop type determined community composition. Most taxa driving differences in community structure were predators and detritivores associated with winter pea and forage crops. In addition to effects on soil arthropods associated with specific crops, effects were also detected across rotations. Incorporating winter pea into rotations improved QBS-ar across entire rotations, not just in the winter pea phases, in both AECs. Links between QBS-ar and other soil health indicators were complex and varied by AEC. **Data Use**: *License*: [Creative Commons Attribution (CC-BY)](https://creativecommons.org/licenses/by/4.0/) *Recommended Citation*: Elmquist D, Kahl KB, Johnson-Maynard J, Eigenbrode S. 2023. Data from: Linking agricultural diversification practices, soil arthropod communities, and soil health (Version 1.0) [Data set]. University of Idaho. https://doi.org/10.7923/rcbw-kx90 **Funding** USDA-NIFA CAP: 2017-68002-26819 Resource URL: https://data.nkn.uidaho.edu/dataset/data-linking-agricultural-diversification-practices-soil-arthropod-communities-and-soil Creator(s): 1. Full Name: Dane C. Elmquist Unique identifier: https://orcid.org/0000-0002-2575-4066 Affiliation(s): University of Idaho 2. Full Name: Kendall B. Kahl Unique identifier: NULL Affiliation(s): University of Idaho 3. Full Name: Jodi L. Johnson-Maynard Unique identifier: https://orcid.org/0000-0002-4450-4636 Affiliation(s): University of Idaho, University of Georgia 4. Full Name: Sanford D. Eigenbrode Unique identifier: https://orcid.org/0000-0003-0054-8511 Affiliation(s): University of Idaho Other Contributor(s): None Publisher: University of Idaho Publication Year: 2023 Language(s): American English Subject(s): 1. Natural Sciences 1.6 Biological Sciences Keywords/Tags: agricultural diversification; biodiversity; community ecology; QBS-ar; soil arthropods; soil health Resource Type General: Dataset Dates: NULL Date available for the public: 2023-05-31 Sizes: 386 kb Format(s): xlsx Version: 1.0 Funding References: United States Department of Agriculture: National Institute of Food and Agriculture Award Number: 2017-68002-26819 Award Title: INLAND PACIFIC NORTHWEST WHEAT-BASED SYSTEMS: LANDSCAPES IN TRANSITION Award URI: https://reeis.usda.gov/web/crisprojectpages/1012733-inland-pacific-northwest-wheat-based-systems-landscapes-in-transition.html Spatial/Geographical Coverage Location: Study Area Description: St. John, WA, USA -117.53987197100328, 47.12030302190407 Genesee, ID, USA -116.82433547392037, 46.51614962855061 Temporal Coverage: Start Date: 2018-05-22 End Date: 2020-09-25 Granularity of the Data: NULL Contact Info: Contact Name: Dane Elmquist Contact Email: elmqu059@gmail.com Related Content: Peer Reviewed Manuscript-Journal of Applied Ecology | https://doi.org/10.1111/1365-2664.14453 Data/Code Files: Data and data dictionary are contained within a single excel data file. Elmquist_et_al_Data_2023.xlsx Data and metadata are contained in separate tabs within the excel spreadsheet. Metadata1 tab corresponds to Database1 tab Metadata2 tab corresponds to Database2 tab