Observations of isoprene and its oxidation products methacrolein (MACR) and methyl vinyl ketone (MVK) are used to quantify the impact of isoprene oxidation on ozone production along the western slope of the Sierra Nevada mountains. Regular daytime up-slope wind flow patterns transport anthropogenic volatile organic compounds (VOC) …
Journal: Journal Of Geophysical Research, Volume 107 (D19): n/a-n/a (2002), ISBN . DOI: 10.1029/2001jd001490 Sites: US-Blo
This study examined the ability of the Photochemical Reflectance Index (PRI) to track seasonal variations in carotenoid pigments and photosynthetic activity of mature evergreen chaparral shrubs. Our results confirm that PRI scales with photosystem two (PSII) …
Journal: Oecologia, Volume 131 (3): 366-374 (2002), ISBN . DOI: 10.1007/s00442-002-0905-9 Sites: US-SO2, US-SO3
Differences in the seasonal pattern of assimilatory and respiratory processes are responsible for divergences in seasonal net carbon exchange among ecosystems. Using FLUXNET data (
Journal:
Agricultural And Forest Meteorology, Volume 113 (1-4): 53-74 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00102-8
Sites: US-Blo, US-Dk3, US-Ho1, US-Me4
We measured net atmospheric exchanges of energy and water vapor using eddy covariance along a chronosequence of Pinus elliottii plantations in north Florida: a recent clear-cut, a mid-rotation stand, and a 24-year-old, rotation-aged stand. Reflected energy averaged 0.26 of incoming solar radiation at the clear-cut and 0.18 …
Journal: Agricultural And Forest Meteorology, Volume 112 (2): 87-102 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00059-x Sites: US-SP1, US-SP2, US-SP3, US-SP4
Allocation of C to belowground plant structures is one of the most important, yet least well quantified fluxes of C in terrestrial ecosystems. In a literature review of mature forests worldwide, Raich …
Journal: Agricultural And Forest Meteorology, Volume 113 (1-4): 39-51 (2002), ISBN . DOI: 10.1016/s0168-1923(02)00101-6 Sites: CR-Lse, US-Dk3, US-Ho1, US-Me4, US-MMS, US-UMB, US-WBW
For two species of oak, we determined whether increasing atmospheric CO2 concentration (Ca) would decrease leaf mitochondrial respiration (R) directly, or indirectly owing to their growth in elevated Ca, or both. In particular, we tested whether acclimatory decreases in leaf-Rubisco …
Journal: Global Change Biology, Volume 8 (4): 317-328 (2002), ISBN . DOI: 10.1046/j.1354-1013.2001.00472.x Sites: US-KS2
The effect of elevated atmospheric CO2 concentration (Ca) on the aboveground biomass of three oak species, Quercus myrtifolia, Q. …
Journal: Global Change Biology, Volume 8 (1): 90-103 (2002), ISBN . DOI: 10.1046/j.1354-1013.2001.00458.x Sites: US-KS2
Quantification of forest structure is important for developing a better understanding of how forest ecosystems function. Additionally, estimation of forest structural attributes, such as aboveground biomass (AGBM), is an important step in identifying the amount of carbon in terrestrial vegetation pools and is central to global carbon …
Journal: Remote Sensing Of Environment, Volume 79 (2-3): 305-319 (2002), ISBN . DOI: 10.1016/s0034-4257(01)00281-4 Sites: CR-Lse
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), ISBN . DOI: 10.1016/s0034-4257(02)00013-5 Sites: CR-Lse
Forests around Manaus have staged the oldest and the longest forest-atmosphere CO2 exchange studies made anywhere in the Amazon. Since July 1999 the exchange of CO2, water, and energy, as well as weather variables, have been measured almost continuously over two forests, 11 km apart, in the Cuieiras reserve near Manaus, Brazil. This …
Journal: Journal Of Geophysical Research, Volume 107 (D20): (2002), ISBN . DOI: 10.1029/2001JD000676 Sites: BR-Ma2