Articles, data, and reports are available at the following websites:
Plants: Images from USDA ARS - Photos of plants provided by the USDA's Agricultural Research Service.
Ag Data Commons - U.S. Dept. of Agriculture
Search Science.gov for authoritative federal science information including research and development results and regulations.
For example, search for: plants AND communities AND earthworms
Refine your search (left menu) by date or topic.
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Excellent research guide for statistics, reports, websites, and more.
Note: Some resources are restricted to Princeton affiliates.