Long-Term Ecological Research (LTER):

Full Proposal Deadline Date: August 14, 2020

Program Guidelines: NSF 19-594

To address ecological questions that cannot be resolved with short-term observations or experiments, NSF established the Long-Term Ecological Research Program (LTER) in 1980. Two components differentiate LTER research from projects supported by other NSF programs: 1) the research is located at specific sites chosen to represent major ecosystem types or natural biomes, and 2) it emphasizes the study of ecological phenomena over long periods of time based on data collected in five core areas. ...
More at https://www.nsf.gov/funding/pgm_summ.jsp?pims_id=505675&WT.mc_id=USNSF_39&WT.mc_ev=click

This is an NSF Upcoming Due Dates item.