Study evaluates how climate change affects rangelands

Awareness of and preparedness for changing climatic trends will promote the ability of rangelands to provide ecosystem services.

A GROUP of eight U.S. scientists, including Texas A&M University's Drs. David Briske and Bruce McCarl, recently published two assessments that identify trends and projections for how climate change affects rangeland and that evaluate adaptation strategies.

"These papers offer an objective, comprehensive assessment of climate trends and contingency planning as it relates to North American rangelands," said Briske, a professor in the department of ecosystem and science management at Texas A&M.

Changes in mean climatic trends and increased variability will affect the ability of rangelands to provide ecosystem services and support human livelihoods, but in varied and geographically specific ways, Briske said.

The researchers said climate models project that the U.S. Southwest and southern Plains will become warmer and drier. The Northwest will become warmer and drier during summer and will experience less snowpack in winter. The northern U.S. and southern Canada are projected to become warmer and wetter.

"Such developments will affect rangeland enterprises and productivity," said McCarl, a Texas A&M AgriLife Research economist.

The interacting effects of atmospheric warming, increased carbon dioxide concentrations and modified precipitation patterns will modify fire regimes, soil carbon content and forage quantity and quality, according to the scientists. This will, in turn, affect livestock production, plant community composition and the distribution of plants, animals and diseases.

Human actions to minimize negative impacts and to capture potential opportunities need to be geographically specific to effectively contend with these varied consequences, according to the researchers. The study also indicates that specific actions to increase carbon sequestration are not an economically viable mitigation strategy because carbon uptake is limited by low and variable precipitation.

However, they concluded, numerous adaptation strategies, including changing perceptions of risk, greater flexibility in production systems and policy changes to emphasize climatic variability rather than consistency, will prove highly valuable.

Livestock production systems also will need to adjust as a result of changing environmental conditions, according to the scientists. Some of the adaptations specific to livestock production may include flexible herd management, alternative livestock breeds or species, innovative pest management methods, modified enterprise structures and, in extreme cases, relocation.

Increasing awareness of and preparedness for changing climatic trends and increasing climatic variability will promote both the supply of ecosystem services and the maintenance of human livelihoods in future climates.

The full articles, "Climate Change & North American Rangelands: Trends, Projections & Implications" and "Climate Change & North American Rangelands: Assessment of Mitigation & Adaptation Strategies," appeared in Rangeland Ecology & Management.

Volume:85 Issue:43

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