Publications

Publications Found: 1437

Ecosystem-Atmosphere Exchange Of Carbon Dioxide Over A Mixed Hardwood Forest In Northern Lower Michigan
Schmid, H. P.

We report results from the first 3 years (1999–2001) of long-term measurements of net ecosystem exchange (NEE) at an AmeriFlux site over a mixed hardwood forest in northern lower Michigan. The primary measurement methodology uses eddy covariance systems with closed-path infrared gas analyzers at two heights (46 and 34 m) above …


Journal: Journal Of Geophysical Research, Volume 108 (D14): 4417-n/a (2003). DOI: 10.1029/2002JD003011 Sites: US-UMB

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). DOI: 10.1029/2002gl016450 Sites: 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). DOI: 10.1007/s10021-003-0205-1 Sites: US-Dk3

Sensitivity Of Large-Footprint Lidar To Canopy Structure And Biomass In A Neotropical Rainforest
Drake, J. B., Dubayah, R. O., Knox, R. G., Clark, D. B., Blair, J.

Accurate estimates of the total biomass in terrestrial vegetation are important for carbon dynamics studies at a variety of scales. Although aboveground biomass is difficult to quantify over large areas using traditional techniques, lidar remote sensing holds great promise for biomass estimation because it directly measures components …


Journal: Remote Sensing Of Environment, Volume 81 (2-3): 378-392 (2002). DOI: 10.1016/s0034-4257(02)00013-5 Sites: CR-Lse

How The Environment, Canopy Structure And Canopy Physiological Functioning Influence Carbon, Water And Energy Fluxes Of A Temperate Broad-Leaved Deciduous Forest–An Assessment With The Biophysical Model CANOAK
Baldocchi, D. D., Wilson, K. B., Gu, L.
This paper focuses on how canopy structure, its physiological functioning and the environment interact to control and drive the exchange of carbon dioxide (CO2) and water vapor between a temperate forest stand and the atmosphere. First, we present an overview of how temporal and spatial variations …


Journal: Tree Physiology, Volume 22 (15-16): 1065-1077 (2002). DOI: 10.1093/treephys/22.15-16.1065 Sites: US-WBW

Carbon Sequestration In A High-Elevation, Subalpine Forest
Monson, R. K., Turnipseed, A. A., Sparks, J. P., Harley, P. C., Scott-Denton, L. E., Sparks, K., Huxman, T. E.

We studied net ecosystem CO2 exchange (NEE) dynamics in a high-elevation, subalpine forest in Colorado, USA, over a two-year period. Annual carbon sequestration for the forest was 6.71 mol C m−2(80.5 g C m−2) for the year between November 1, 1998 and October 31, 1999, and 4.80 mol C m−2(57.6 g C m−2) …


Journal: Global Change Biology, Volume 8 (5): 459-478 (2002). DOI: 10.1046/j.1365-2486.2002.00480.x Sites: US-NR1

Environmental Controls On Carbon Dioxide Flux From Black Spruce Coarse Woody Debris
Wang, C., Bond-Lamberty, B., Gower, S.

Carbon dioxide flux from coarse woody debris (CWD) is an important source of CO2 in forests with moderate to large amounts of CWD. A process-based understanding of environmental controls on CWD CO2 flux (RCWD) is needed to accurately model carbon exchange between …


Journal: Oecologia, Volume 132 (3): 374-381 (2002). DOI: 10.1007/s00442-002-0987-4 Sites: CA-NS3, CA-NS5, CA-NS6

Inversion Of Net Ecosystem CO2 Flux Measurements For Estimation Of Canopy PAR Absorption
Hanan, N. P., Burba, G., Verma, S. B., Berry, J. A., Suyker, A., Walter-Shea, E. A.

The fractional absorption of photosynthetically active radiation (fPAR) is frequently a key variable in models describing terrestrial ecosystem–atmosphere interactions, carbon uptake, growth and biogeochemistry. We present a novel approach to the estimation of the fraction of incident photosynthetically active …


Journal: Global Change Biology, Volume 8 (6): 563-574 (2002). DOI: 10.1046/j.1365-2486.2002.00488.x Sites: US-Pon, US-Shd

Elevated Atmospheric CO2 Lowers Herbivore Abundance, But Increases Leaf Abscission Rates
Stiling, P., Cattell, M., Moon, D. C., Rossi, A., Hungate, B. A., Hymus, G., Drake, B.

Increased levels of atmospheric carbon dioxide (CO2) are likely to affect the trophic relationships that exist between plants, their herbivores and the herbivores’ …


Journal: Global Change Biology, Volume 8 (7): 658-667 (2002). DOI: 10.1046/j.1365-2486.2002.00501.x Sites: US-KS2

Direct Estimation Of Aboveground Forest Productivity Through Hyperspectral Remote Sensing Of Canopy Nitrogen
Smith, M., Ollinger, S. V., Martin, M. E., Aber, J. D., Hallett, R. A., Goodale, C. L.


Journal: Ecological Applications, Volume 12 (5): 1286-1302 (2002). DOI: 10.2307/3099972 Sites: US-Bar