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NATIONAL SCIENCE FOUNDATION (2019)

Community reordering alters ecosystem processes in desert grassland

Ecosystem Desert Grassland

NATIONAL SCIENCE FOUNDATION

Titre : Community reordering alters ecosystem processes in desert grassland

Organismes NSF : DEB Division Of Environmental Biology

Durée : May 15, 2019 // April 30, 2024 (Estimated)

Résumé
Global environmental change can cause large-scale disruptions to ecosystems by gradually shifting both the presence and abundance of different plant species. Many ecosytems are characterized by a few dominant plants, but it is unclear if these species will remain dominants as environmental conditions change. The loss of dominant species may have a large impact, creating a potential cascade of effects on the overall structure and function of the ecosystem. Ongoing work at the Sevilleta National Wildlife Refuge in New Mexico indicates that a common desert grass is gradually replacing a widespread Great Plains grass. To understand how changes in rainfall amount, timing and variability affect the rate, amount and direction of reordering among the dominant grass species, this project will link the effects of species reordering to carbon cycling and net primary production. Experiments will alter water, temperature and nitrogen availability to test how grasslands respond to these environmental changes. Dryland ecosystems, which cover 45% of global continental land area, have measurable impacts on the global carbon budget. Drylands are changing rapidly in response to droughts, air pollution, and increased rainfall variability. Community reordering may be key to advancing the understanding of different global change factors affecting dryland ecosystems in the southwestern United States and elsewhere.

Partenaire (s) : Scott Collins scollins unm.edu (Principal Investigator) Jennifer Rudgers (Co-Principal Investigator)

Sponsor  : University of New Mexico 1700 Lomas Blvd. NE, Suite 2200 Albuquerque, NM 87131-0001

Financement : $489,000.00

National Science Foundation

Page publiée le 10 juillet 2019