LTER Data Portal
This web site hosts a search engine for the United States Long Term Ecological Research Network.
Data Location: http://metacat.lternet.edu/das/lter/advancedsearch.jsp
Comments: Search by LTER station, subject, title, abstract, keywords, author, organization, geographic location, taxon. The LTER network continually produce data on primary productivity, organic matter, inorganic nutrients, disturbance, and populations for all field locations.