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Application of Soil Quality to Monitoring and Management

Paradigms from Rangeland Ecology

Jeffrey E. Herrick*,a, Joel R. Brownb, Arlene J. Tugelb, Patrick L. Shaverc and Kris M. Havstada

a Jornada Exp. Range, MSC 3JER, New Mexico State Univ., Box 30003, Las Cruces, NM 88003, USDA-ARS
b USDA-NRCS, Jornada Exp. Range, MSC 3JER, New Mexico State Univ., Box 30003, Las Cruces, NM 88003
c USDA-NRCS, Oregon State Univ., 202 Strand Agric. Hall, Corvallis, OR 97331



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  		Fig. 1. Example of how spatial variability in a soil property can serve as an early warning indicator of change in ecosystem function due to cascading effects and positive feedback loops.

 


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  		Fig. 2. Example of a state and transition diagram for a Simona soil in the northern Chihuahuan Desert. The structure of the model is based on Stringham et al. (2001). Arrows within boxes (states) represent easily reversible plant community composition and associated soil changes. Unidirectional arrows between states reflect that the transitions are nonreversible without external inputs. Text between states describes some of the processes associated with each transition. The diagram has been simplified and does not include all possible plant communities in States 3 and 4.

 




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 2002 by the American Society of Agronomy.