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Natural Resource Ecology and Management

NREM Faculty - Jim Ansley

Department Head

011 Agriculture Hall (office)
008C Agriculture Hall (mail)
Stillwater, OK 74078

Educational Background
BA: Hastings College, Hastings, Nebraska; Biology
MS: Utah State University; Range Science
PhD: University of Wyoming; Agronomy

Curriculum Vita




Research Interests

My research at Texas A&M AgriLife Research in Vernon, TX centered around invasive woody plants on rangelands.  In particular, I studied the impacts of encroachment of honey mesquite (Prosopis glandulosa) and several juniper species (redberry juniper, Juniperus pinchotii and Ashe juniper; J. ashii) on grasslands and savannas in north central Texas.  Within that overall scope, I studied woody plant/grass competition, woody plant water use and growth rates, mesquite root responses to long-term drought and wet periods, and ecology of mesquite seedling recruitment. I also studied several aspects of woody plant (“brush”) control, including effects of fire intensity and seasonal fires on mesquite, juniper, grasses and soil nutrients, and effects of various herbicides on mesquite and associated non-target species.  Finally, in an attempt to alleviate the cost of brush control, I investigated the potential of mesquite and juniper species for bioenergy uses.  This work involved determining regrowth rates of mesquite following harvest, GIS applications to determining landscape-level stand biomass using aerial and satellite images, some initial studies on the ecological economics of mesquite for bioenergy and, in collaboration with colleagues at Texas A&M, the potential of mesquite and juniper for gasification or co-firing with coal.

Recent Publications (see CV for full list; asterisk denotes grad student or post-doc mentored by Dr. Ansley)

Ansley, R.J., T. Zhang and C. Cooper. 2018. Soil moisture, grass production and mesquite resprout architecture following mesquite above-ground mortality. Water 10, doi:10.3390/w10091243.

Ansley, R.J., W.E. Pinchak and M.K. Owens. 2017. Mesquite pod removal by cattle, feral hogs and native herbivores. Rangeland Ecology and Management 70: 469-476.

Kreuter, U.P., A.D. Iwaasa, G.L. Theodori, R.J. Ansley, R.B. Jackson,L.H. Fraser, M.A. Naeth, S. McGillivrayand E.G. Moya.2016. State of knowledge about energy development impact on North American rangelands: an integrative approach. J. Environmental Management 180: 1-9.

Chen, W.*, S. Thanapal, K. Annamalai andR.J. Ansley. 2016. Kinetics of pyrolysis of mesquite biomass fuel from TGA data. International Journal of Green Energy 13: 1380-1387.

Thanapal, S.S.*, K. Annamalai, R.J. Ansleyand D. Ranjan.  2015. Cofiring carbon dioxide torrified woody biomass with coal on emission characteristics. Biomass Conversion and Biorefinery 6: 91-104.

Jain, S.*, S. Ale, C.L. Munster, R.J. Ansleyand J.R. Kiniry. 2015. Simulating the hydrologic impact of Arundo donaxinvasion on headwaters of the Nueces River in Texas. Hydrology 2: 134-147.

Ansley, R.J., B.A. Kramp and D.L. Jones. 2015.  Honey mesquite (Prosopis glandulosa) seedling responses to seasonal timing of fire and fireline intensity. Rangeland Ecology and Management 68: 194-203.

Chen, W.*, S. Thanapal, K. Annamalai andR.J. Ansley. 2015.  Liquid yield from juniper and mesquite bio-fuel gasification. International Journal of Energy Research 39: 621-633.