Publications

Publications Found: 1373

Simulated Variations In Atmospheric CO2 Over A Wisconsin Forest Using A Coupled Ecosystem-Atmosphere Model
Scott Denning, A., Nicholls, M., Prihodko, L., Baker, I., Vidale, P., Davis, K., Bakwin, P.

Ecosystem fluxes of energy, water, and CO2 result in spatial and temporal variations in atmospheric properties. In principle, these variations can be used to quantify …


Journal: Global Change Biology, Volume 9 (9): 1241-1250 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00613.x Sites: US-Los, US-PFa, US-WCr

Remote Estimation Of Leaf Area Index And Green Leaf Biomass In Maize Canopies
Gitelson, A. A., Viña, A., Arkebauer, T. J., Rundquist, D. C., Keydan, G., Leavitt, B.

Leaf area index (LAI) is an important variable for climate modeling, estimates of primary production, agricultural yield forecasting, and many other diverse studies. Remote sensing provides a considerable potential for estimating LAI at local to regional and global scales. Several spectral vegetation indices have been proposed, but …


Journal: Geophysical Research Letters, Volume 30 (5): n/a-n/a (2003), ISBN . DOI: 10.1029/2002gl016450 Sites: US-Ne2, US-Ne3

Modelling Carbon Balances Of Coastal Arctic Tundra Under Changing Climate
Grant, R. F., Oechel, W. C., Ping, C.

Rising air temperatures are believed to be hastening heterotrophic respiration (Rh) in arctic tundra ecosystems, which could lead to substantial losses of soil carbon …


Journal: Global Change Biology, Volume 9 (1): 16-36 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00549.x Sites: US-Brw

Classification Of Crop Yield Variability In Irrigated Production Fields
Dobermann, A., Ping, J. L., Adamchuk, V. I., Simbahan, G. C., Ferguson, R. B.

Crop yield maps reflect stable yield patterns and annual random yield variation. Procedures for classifying a sequence of yield maps to delineate yield zones were evaluated in two irrigated maize (Zea mays L.) fields. Yield classes were created using empirically defined yield categories or through hierarchical or nonhierarchical …


Journal: Agronomy Journal, Volume 95 (5): 1105-1120 (2003), ISBN . DOI: 10.2134/agronj2003.1105 Sites: US-Ne1, US-Ne2, US-Ne3

Soil-Nitrogen Cycling In A Pine Forest Exposed To 5 Years Of Elevated Carbon Dioxide
Finzi, A. C., Schlesinger, W. H.

Empirical and modeling studies have shown that the magnitude and duration of the primary production response to elevated carbon dioxide (CO2) can be constrained by limiting supplies of soil nitrogen (N). We have studied the response of a southern …


Journal: Ecosystems, Volume 6 (5): 444-456 (2003), ISBN . DOI: 10.1007/s10021-003-0205-1 Sites: US-Dk3

Environmental Controls On Net Ecosystem-Level Carbon Exchange And Productivity In A Central American Tropical Wet Forest
Loescher, H. W., Oberbauer, S. F., Gholz, H. L., Clark, D. B.

Difficulty in balancing the global carbon budget has lead to increased attention on tropical forests, which have been estimated to account for up to one third of global gross primary production. Whether tropical forests are sources, sinks, or neutral with respect to their carbon balance with the atmosphere remains unclear. To address …


Journal: Global Change Biology, Volume 9 (3): 396-412 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00599.x Sites: CR-Lse

Arbuscular Mycorrhizal Communities In Tropical Forests Are Affected By Host Tree Species And Environment
Lovelock, C. E., Andersen, K., Morton, J. B.

Arbuscular mycorrhizal (AM) fungi are mutualists with plant roots that are proposed to enhance plant community diversity. Models indicate that AM fungal communities could maintain plant diversity in forests if functionally different communities are spatially separated. In this study we assess the spatial and temporal distribution …


Journal: Oecologia, Volume 135 (2): 268-279 (2003), ISBN . DOI: 10.1007/s00442-002-1166-3 Sites: CR-Lse

Substantial Labile Carbon Stocks And Microbial Activity In Deeply Weathered Soils Below A Tropical Wet Forest
Veldkamp, E., Becker, A., Schwendenmann, L., Clark, D. A., Schulte-Bisping, H.

Contrary to large areas in Amazonia of tropical moist forests with a pronounced dry season, tropical wet forests in Costa Rica do not depend on deep roots to maintain an evergreen forest canopy through the year. At our Costa Rican tropical wet forest sites, we found a large carbon stock in the subsoil of deeply weathered Oxisols, …


Journal: Global Change Biology, Volume 9 (8): 1171-1184 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00656.x Sites: CR-Lse

Inter-annual carbon dioxide uptake of a wet sedge tundra ecosystem in the Arctic
Harazono Y, Mano M, Miyata A, Zulueta RC, Oechel WC


Journal: Tellus, Volume 55B: 215-231 (2003), ISBN . DOI: Sites: US-Cms

An evaluation of ozone exposure metrics for a seasonally drought-stressed ponderosa pine ecosystem
Panek, J. A., Kurpius, M. R., Goldstein, A. H.

Ozone stress has become an increasingly significant factor in cases of forest decline reported throughout the world. Current metrics to estimate ozone exposure for forest trees are derived from atmospheric concentrations and assume that the forest is physiologically active at all times of the growing season. This may be inaccurate …


Journal: Environmental Pollution, Volume 117 (1): 93-100 (2002), ISBN . DOI: 10.1016/S0269-7491(01)00155-5 Sites: US-Blo