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Publications Found: 1437

Influence Of Biotic Exchange And Combustion Sources On Atmospheric CO2 Concentrations In New England From Observations At A Forest Flux Tower
Potosnak, M. J., Wofsy, S. C., Denning, A. S., Conway, T. J., Munger, J. W., Barnes, D. H.

Hourly data for concentrations and fluxes of CO₂ at 30 m in Harvard Forest (Petersham, Massachusetts) are analyzed using linear modeling to obtain regionally representative CO₂ concentrations …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D8): 9561-9569 (1999). DOI: 10.1029/1999jd900102 Sites: US-Ha1

Structure Analysis And Classification Of Boreal Forests Using Airborne Hyperspectral BRDF Data From ASAS
Sandmeier, S., Deering, D.

A new approach is presented for deriving vegetation canopy structural characteristics from hyperspectral bidirectional reflectance distribution function (BRDF) data. The methodology is based on the relationship between spectral variability of BRDF effects and canopy geometry. …

Journal: Remote Sensing Of Environment, Volume 69 (3): 281-295 (1999). DOI: 10.1016/s0034-4257(99)00032-2 Sites: CA-Obs, CA-Ojp

Measurements Of PAR Transmittance Within Boreal Forest Stands During BOREAS
Roujean, J.

This paper shows the results of solar flux measurements routinely collected within boreal conifer forests during BOREAS 1994. Such vegetation have open canopies with a high level of clumping and covered by crowns which yields strong directional effects on the spectral hemispherical …

Journal: Agricultural And Forest Meteorology, Volume 93 (1): 1-6 (1999). DOI: 10.1016/s0168-1923(98)00110-5 Sites: CA-Obs, CA-Ojp

Spatial And Temporal Variation In The Carbon And Oxygen Stable Isotope Ratio Of Respired CO2 In A Boreal Forest Ecosystem
Flanagan, L. B., Kubien, D. S., Ehleringer, J. R.

We measured the stable isotope ratio of respired carbon dioxide at two spatial scales in a black spruce forest in northern Canada: CO₂ released from the forest floor and CO₂ released from the entire ecosystem at night. Despite wide variation in the δ13C values of organic matter among above-ground plant species, …

Journal: Tellus Series B-Chemical and Physical Meteorology., Volume 51 (2): n/a-n/a (1999). DOI: 10.3402/tellusb.v51i2.16306 Sites: CA-Let

Interacting Influence Of Mycorrhizal Symbiosis And Competition On Plant Diversity In Tallgrass Prairie
Smith, M. D., Hartnett, D. C., Wilson, G. W.

In tallgrass prairie, plant species interactions regulated by their associated mycorrhizal fungi may be important forces that influence species coexistence and community structure; however, the mechanisms and magnitude of these interactions remain unknown. The objective of this study was to determine how interspecific competition, …

Journal: Oecologia, Volume 121 (4): 574-582 (1999). DOI: 10.1007/s004420050964 Sites: US-KFB, US-Kon

Environmental Controls Over Net Exchanges Of Carbon Dioxide From Contrasting Florida Ecosystems
Clark, K. L., Gholz, H. L., Moncrieff, J. B., Cropley, F., Loescher, H. W.

Journal: Ecological Applications, Volume 9 (3): 936-948 (1999). DOI: 10.2307/2641340 Sites: US-SP1, US-SP2, US-SP3, US-SP4

Wintertime CO2 Efflux From Arctic Soils: Implications For Annual Carbon Budgets
Fahnestock, J. T., Jones, M. H., Welker, J. M.

Estimates of annual carbon loss from arctic tundra ecosystems are based nearly entirely on measurements taken during the growing season in part because of methodological limitations but also reflecting the assumption that respiration during winter is near zero. Measurements of CO₂ flux during winter, however, indicate …

Journal: Global Biogeochemical Cycles, Volume 13 (3): 775-779 (1999). DOI: 10.1029/1999gb900006 Sites: US-Upa

Seasonal And Annual Respiration Of A Ponderosa Pine Ecosystem
Law, B. E., Ryan, M. G., Anthoni, P. M.

The net ecosystem exchange of CO₂ between forests and the atmosphere, measured by eddy covariance, is the small difference between two large fluxes of photosynthesis and respiration. Chamber measurements of soil surface CO₂ efflux (F_s), wood respiration (F_w) and foliage respiration (F_f) …

Journal: Global Change Biology, Volume 5 (2): 169-182 (1999). DOI: 10.1046/j.1365-2486.1999.00214.x Sites: US-Me4

Nitrogen Dry Deposition At An Ameriflux Site In A Hardwood Forest In The Midwest
Pryor, S. C., Barthelmie, R. J., Jensen, B.

This paper presents observations of ammonia, nitric acid and size segregated chemically speciated aerosols above the canopy of a secondary successional deciduous forest in Indiana during spring. Average nitric acid concentrations range between 0.1–1 µg m⁻³ and vertical gradients from 1 to 9 ng m⁻³ / m. …

Journal: Geophysical Research Letters, Volume 26 (6): 691-694 (1999). DOI: 10.1029/1999gl900066 Sites: US-MMS

Long-Term Observation Of The Atmospheric Exchange Of CO2 With A Temperate Deciduous Forest In Southern Ontario, Canada
Lee, X., Fuentes, J. D., Staebler, R. M., Neumann, H. H.

This paper reports the results of the analysis of eddy covariance CO₂ data obtained at a successional forest of maple and aspen at Camp Borden in southern Ontario, Canada, between July 1995 and December 1997. Main findings are (1) The Michaelis-Menton model explains >50–65% of the observed variance of the daytime …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D13): 15975-15984 (1999). DOI: 10.1029/1999jd900227 Sites: CA-Cbo

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