Search Results - "Ojima, D."

Nutrient Imbalances in Agricultural Development by Vitousek, P.M, Naylor, R, Crews, T, David, M.B, Drinkwater, L.E, Holland, E, Johnes, P.J, Katzenberger, J, Martinelli, L.A, Matson, P.A, Nziguheba, G, Ojima, D, Palm, C.A, Robertson, G.P, Sanchez, P.A, Townsend, A.R, Zhang, F.S

“…Nutrient additions to intensive agricultural systems range from inadequate to excessive--and both extremes have substantial human and environmental costs…”
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Model-data synthesis in terrestrial carbon observation: methods, data requirements and data uncertainty specifications by Raupach, M.R, Rayner, P.J, Barrett, D.J, Defries, R.S, Heimann, M, Ojima, D.S, Quegan, S, Schmullius, C.C

“…Systematic, operational, long‐term observations of the terrestrial carbon cycle (including its interactions with water, energy and nutrient cycles and…”
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Smallholder Farmer Adoption of Climate-Related Adaptation Strategies: The Importance of Vulnerability Context, Livelihood Assets, and Climate Perceptions by Shinbrot, X. A., Jones, K. W., Rivera-Castañeda, A., López-Báez, W., Ojima, D. S.

“…Despite increased research characterizing the adaptive capacity of households and communities, there are few empirical studies that test why farmers adopt…”
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DAYCENT National-Scale Simulations of Nitrous Oxide Emissions from Cropped Soils in the United States by Del Grosso, S.J, Parton, W.J, Mosier, A.R, Walsh, M.K, Ojima, D.S, Thornton, P.E

“…Until recently, Intergovernmental Panel on Climate Change (IPCC) emission factor methodology, based on simple empirical relationships, has been used to…”
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Generalized model for NOx and N2O emissions from soils by PARTON, W. J, HOLLAND, E. A, DEL GROSSO, S. J, HARTMAN, M. D, MARTIN, R. E, MOSIER, A. R, OJIMA, D. S, SCHIMEL, D. S

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High resolution modeling of the regional impacts of climate change on irrigation water demand by Elgaali, E, Garcia, L. A, Ojima, D. S

“…In the Arkansas River Basin in southeastern Colorado, surface irrigation provides most of the water required for agriculture. Consequently, the region's future…”
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Estimation of Soil Organic Carbon Changes in Turfgrass Systems Using the CENTURY Model by Bandaranayake, W, Qian, Y.L, Parton, W.J, Ojima, D.S, Follett, R.F

“…Soil organic C (SOC) directly affects soil quality by influencing aeration and water retention and serving as a major repository and reserve source of plant…”
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Simulated effects of dryland cropping intensification on soil organic matter and greenhouse gas exchanges using the DAYCENT ecosystem model by Del Grosso, S, Ojima, D, Parton, W, Mosier, A, Peterson, G, Schimel, D

“…The DAYCENT model predicts dryland agricultural soils will be net sources of greenhouse gases but the magnitude can be reduced through management practices. We…”
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Dynamic replacement and loss of soil carbon on eroding cropland by Harden, J. W., Sharpe, J. M., Parton, W. J., Ojima, D. S., Fries, T. L., Huntington, T. G., Dabney, S. M.

“…Links between erosion/sedimentation history and soil carbon cycling were examined in a highly erosive setting in Mississippi loess soils. We sampled soils on…”
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U.S. agriculture and climate change: New results by REILLY, J, TUBIELLO, F, MEARNS, L, OJIMA, D, PAUL, E, PAUSTIAN, K, RIHA, S, ROSENBERG, N, ROSENZWEIG, C, MCCARL, B, ABLER, D, DARWIN, R, FUGLIE, K, HOLLINGER, S, IZAURRALDE, C, JAGTAP, S, JONES, J

“…We examined the impacts on U.S. agriculture of transient climate change as simulated by 2 global general circulation models focusing on the decades of the…”
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Using simple environmental variables to estimate below-ground productivity in grasslands by Gill, R. A., Kelly, R. H., Parton, W. J., Day, K. A., Jackson, R. B., Morgan, J. A., Scurlock, J. M. O., Tieszen, L. L., Castle, J. V., Ojima, D. S., Zhang, X. S.

“…In many temperate and annual grasslands, above-ground net primary productivity (NPP) can be estimated by measuring peak above-ground biomass. Estimates of…”
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Grassland to Woodland Transitions: Integrating Changes in Landscape Structure and Biogeochemistry by Hibbard, K. A., Schimel, D. S., Archer, S., Ojima, D. S., W. Parton

“…In many of the world's drylands, human-induced alteration of grazing and fire regimes over the past century has promoted the replacement of grasses by woody…”
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DAYCENT model analysis of past and contemporary soil N2O and net greenhouse gas flux for major crops in the USA by Del Grosso, S.J, Mosier, A.R, Parton, W.J, Ojima, D.S

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Integrative geospatial approaches for the comprehensive monitoring and assessment of land management sustainability: Rationale, Potentials, and Characteristics by Buenemann, M., Martius, C., Jones, J. W., Herrmann, S. M., Klein, D., Mulligan, M., Reed, M. S., Winslow, M., Washington-Allen, R. A., Lal, R., Ojima, D.

“…Sustainable dryland management seeks to improve the conditions of people and ecosystems affected by degradation, but it is often unclear which land management…”
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Intra-annual and interannual variability of ecosystem processes in shortgrass steppe by Kelly, R. H., Parton, W. J., Hartman, M. D., Stretch, L. K., Ojima, D. S., Schimel, D. S.

“…We used a daily time step ecosystem model (DAYCENT) to simulate ecosystem processes at a daily, biweekly, monthly, and annual time step. The model effectively…”
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Ecological impact of historical and future land-use patterns in Senegal by Parton, W, Tappan, G, Ojima, D, Tschakert, P

“…The CENTURY model was used to simulate changes in total system carbon resulting from land-use history (1850–2000), and impacts of climatic changes and improved…”
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Seasonal and interannual variability in surface energy partitioning and vegetation cover with grazing at shortgrass steppe by Jamiyansharav, K., Ojima, D., Pielke, R.A., Parton, W., Morgan, J., Beltrán-Przekurat, A., LeCain, D., Smith, D.

“…We evaluated shortgrass steppe energy budgets based on the Bowen Ratio Energy Balance method for three different grazing intensity treatments at the Central…”
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Elevated atmospheric CO2 effects and soil water feedbacks on soil respiration components in a Colorado grassland by Pendall, E., Del Grosso, S., King, J. Y., LeCain, D. R., Milchunas, D. G., Morgan, J. A., Mosier, A. R., Ojima, D. S., Parton, W. A., Tans, P. P., White, J. W. C.

“…The shortgrass steppe is a semi‐arid grassland, where elevated CO2 reduces stomatal conductance and promotes soil moisture storage. Enhanced biomass growth…”
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Implementation of a Two-Way Interactive Atmospheric and Ecological Model and Its Application to the Central United States by Lu, Lixin, Pielke, Roger A., Liston, Glen E., Parton, William J., Ojima, Dennis, Hartman, Melannie

“…A coupled Regional Atmospheric Modeling System (RAMS) and ecosystem (CENTURY) modeling system has been developed to study regional-scale two-way interactions…”
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Comparison of N2O emissions from soils at three temperate agricultural sites: simulations of year-round measurements by four models by Frolking, SE, Mosier, A R, Ojima, D S, C Li, Parton, W J, Potter, C S, Priesack, E, Stenger, R, Haberbosch, C, Dörsch, P, Flessa, H, Smith, KA

“…Nitrous oxide (N2O) flux simulations by four models were compared with year-round field measurements from five temperate agricultural sites in three countries…”
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