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Publications Found: 1437

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

Diurnal And Annual Exchanges Of Mass And Energy Between An Aspen-Hazelnut Forest And The Atmosphere: Testing The Mathematical Model Ecosys With Data From The BOREAS Experiment
Grant, R. F., Black, T. A., den Hartog, G., Berry, J. A., Neumann, H. H., Blanken, P. D., Yang, P. C., Russell, C., Nalder, I. A.

There is much uncertainty about the net carbon (C) exchange of boreal forest ecosystems, although this exchange may be an important part of global C dynamics. To resolve this uncertainty, net C exchange has …

Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D22): 27699-27717 (1999). DOI: 10.1029/1998jd200117 Sites: CA-Oas

Below-Canopy And Soil CO2 Fluxes In A Ponderosa Pine Forest
Law, B., Baldocchi, D., Anthoni, P.

Below-canopy eddy covariance measurements of CO₂ flux (F_cb) and soil surface CO₂flux measurements (F_s) were made seasonally in a ponderosa pine forest in central Oregon in 1996 and 1997. The forest ecosystem has …

Journal: Agricultural And Forest Meteorology, Volume 94 (3-4): 171-188 (1999). DOI: 10.1016/s0168-1923(99)00019-2 Sites: US-Me4

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