Search Results - "Emmerich, W.E."

Partitioning evapotranspiration in semiarid grassland and shrubland ecosystems using time series of soil surface temperature by Moran, M.S., Scott, R.L., Keefer, T.O., Emmerich, W.E., Hernandez, M., Nearing, G.S., Paige, G.B., Cosh, M.H., O’Neill, P.E.

“…Information about the ratio of transpiration ( T) to total evapotranspiration ( T/ET) is related to critical global change concerns, including shrub…”
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Partitioning of evapotranspiration and its relation to carbon dioxide exchange in a Chihuahuan Desert shrubland by Scott, R.L, Huxman, T.E, Cable, W.L, Emmerich, W.E

“…Key to evaluating the consequences of woody plant encroachment on water and carbon cycling in semiarid ecosystems is a mechanistic understanding of how…”
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Precipitation thresholds for CO2 uptake in grass and shrub plant communities on Walnut Gulch Experimental Watershed by Emmerich, W.E

“…In semiarid ecosystems, precipitation is the major driving force for carbon uptake and subsequent plant growth. The hypothesis for this study was that the…”
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Sedimentation source identification in a semiarid watershed at soil mapping unit scales by RHOTON, F.E, EMMERICH, W.E, NEARING, M.A, MCCHESNEY, D.S, RITCHIE, J.C

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Long-term carbon dioxide and water flux database, Walnut Gulch Experimental Watershed, Arizona, United States by Emmerich, W.E, Verdugo, C.L

“…We present the carbon dioxide and water flux data along with associated meteorological data collected by the U.S. Department of Agriculture Agricultural…”
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Preface to special section on Fifty Years of Research and Data Collection: U.S. Department of Agriculture Walnut Gulch Experimental Watershed by Moran, M.S, Emmerich, W.E, Goodrich, D.C, Heilman, P, Holifield Collins, C.D, Keefer, T.O, Nearing, M.A, Nichols, M.H, Renard, K.G, Scott, R.L

“…This special section of Water Resources Research and the associated Web site ( http://www.tucson.ars.ag.gov/dap/) describe 50 years of data collection and the…”
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Identification of Suspended Sediment Sources Using Soil Characteristics in a Semiarid Watershed by Rhoton, F.E, Emmerich, W.E, DiCarlo, D.A, McChesney, D.S, Nearing, M.A, Ritchie, J.C

“…Identification of primary sediment source areas in watersheds is necessary to ensure that best management practices are installed in areas that maximize…”
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Sediment source identification in a semiarid watershed at soil mapping unit scales by Rhoton, F.E., Emmerich, W.E., Nearing, M.A., McChesney, D.S., Ritchie, J.C.

“…Selective erosion and transport of silt and clay particles from watershed soil surfaces leads to enrichment of suspended sediments by size fractions that are…”
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Soil Geomorphological Characteristics of a Semiarid Watershed: Influence on Carbon Distribution and Transport by Rhoton, F.E, Emmerich, W.E, Goodrich, D.C, Miller, S.N, McChesney, D.S

“…In the marginally productive rangelands of the semiarid, southwestern USA, the maintenance of organic C (OC) is essential to the stability of the ecosystem…”
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A remote sensing approach for estimating distributed daily net carbon dioxide flux in semiarid grasslands by Holifield Collins, C.D, Emmerich, W.E, Moran, M.S, Hernandez, M, Scott, R.L, Bryant, R.B, King, D.M, Verdugo, C.L

“…Semiarid systems compose a significant portion of the world's terrestrial area and may play an important role in the global carbon cycle. A model was developed…”
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Aggregation/Erodibility Index for Soils in a Semiarid Watershed, Southeastern Arizona by Rhoton, F.E, Emmerich, W.E, Goodrich, D.C, Miller, S.N, McChesney, D.S

“…Variations in soil profile thickness, surface soil properties, erosion rates, runoff, and sediment properties within similar soils and watersheds are…”
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Ecosystem Water Use Efficiency in a Semiarid Shrubland and Grassland Community by Emmerich, William E.

“…Ecosystem water use efficiency (EWUE) is defined as the net carbon uptake per amount of water lost from the ecosystem and is a useful measure of the…”
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Season and erosion pavement influence on saturated soil hydraulic conductivity by Emmerich, W.E

“…Soil infiltration controls the partitioning of rainfall into surface runoff, groundwater recharge, and soil moisture. Understanding seasonal variability and…”
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Effect of polyethylene glycol exclusion on the water potential of solution-saturated filter paper by Hardegree, Stuart P., William E. Emmerich

“…Solutions of high molecular weight polyethylene glycol are often used to control water potential in seed germination studies. There is an implicit assumption…”
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Partitioning water potential and specific salt effects on seed germination of four grasses by Hardegree, S.P, Emmerich, W.E

“…In this study water potential (ψw) and the salt contribution to the osmotic component of ψw(ψw) of the germination solution were controlled separately to…”
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Changes in surface runoff and sediment production after repeated rangeland burns by Emmerich, W.E, Cox, J.R

“…Prescribed burning of vegetation may increase the potential for surface runoff and erosion. Changes in surface runoff and sediment production were evaluated…”
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Nutrient dynamics of rangeland burns in southeastern Arizona by Emmerich, W.E

“…Burning of vegetation generally increases surface runoff and erosion and potentially can change the nutrient dynamics of an ecosystem with loss of nutrients…”
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Relation between soil properties and effectiveness of low-cost water-harvesting treatments by Emmerich, W.E, Frasier, G.W, Fink, D.H

“…Knowledge of the relationship between soil properties and treatment performance is important to obtain maximum benefit from low‐cost water‐harvesting…”
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Hydrologic characteristics immediately after seasonal burning on introduced and native grasslands by Emmerich, W.E. (USDA, ARS, Southwest Watershed Research Center, Tucson, AZ), Cox, J.R

“…Fire on rangelands used as a management tool or as an unwanted wildfire removes vegetation cover. Vegetation cover is thought to be a dominate factor…”
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Partial and full dehydration impact on germination of 4 warm-season grasses by Emmerich, W.E. (USDA-ARS, Southwest Watershed Research Center, Tucson, AZ.), Hardegree, S.P

“…Precipitation patterns in the arid southwest U.S. can be highly variable during the summer monsoon season. The ability of germinating seeds to withstand…”
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