Effects of water and nitrogen stresses on a shortgrass prairie ecosystem
Response of a shortgrass prairie ecosystem to stresses created by excess inputs of water and nitrogen were studied during a two year period in northeastern Colorado. Nitrogen stress was created by maintaining soil water potential greater than -0.8 bars during the growing season. Responses measured were net primary productivity, species composition and organization of primary producers, evapotranspiration, and small mammal densities. Net primary productivity was more responsive to water and nitrogen in combination than to either individually. Aboveground contribution to net primary productivity ...
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