AmeriFlux Publications from the Community

Filtering Airborne Laser Scanning Data With Morphological Methods
Chen, Q., Gong, P., Baldocchi, D., Xie, G.

Filtering methods based on morphological operations have been developed in some previous studies. The biggest challenge for these methods is how to keep the terrain features unchanged while using large window sizes for the morphological opening. Zhang et al. (2003) tried to achieve this goal, but their method required the assumption …

Journal: Photogrammetric Engineering & Remote Sensing, Volume 73 (2): 175-185 (2007), ISBN . DOI: 10.14358/pers.73.2.175 Sites: US-Ton

Mature Semiarid Chaparral Ecosystems Can Be A Significant Sink For Atmospheric Carbon Dioxide
Luo, H., Oechel, W. C., Hastings, S. J., Zulueta, R., Qian, Y., Kwon, H.

Carbon flux in arid and semiarid area shrublands, especially in old-growth shrub ecosystems, has been rarely studied using eddy covariance techniques. In this study, eddy covariance measurements over a 100-year old-growth chamise-dominated chaparral shrub ecosystem were conducted for 7 years from 1996 to 2003. A carbon sink, from …

Journal: Global Change Biology, Volume 13 (2): 386-396 (2007), ISBN . DOI: 10.1111/j.1365-2486.2006.01299.x Sites: US-SO2, US-SO3, US-SO4

What The Towers Don'T See At Night: Nocturnal Sap Flow In Trees And Shrubs At Two Ameriflux Sites In California
Fisher, J. B., Baldocchi, D. D., Misson, L., Dawson, T. E., Goldstein, A. H.

At the leaf scale, it is a long-held assumption that stomata close at night in the absence of light, causing transpiration to decrease to zero. Energy balance models and evapotranspiration equations often rely on net radiation as an upper bound, and some models reduce evapotranspiration to zero at night when there is no solar radiation. …

Journal: Tree Physiology, Volume 27 (4): 597-610 (2007), ISBN . DOI: 10.1093/treephys/27.4.597 Sites: US-Ton

What Limits Evaporation From Mediterranean Oak Woodlands – The Supply Of Moisture In The Soil, Physiological Control By Plants Or The Demand By The Atmosphere?
Baldocchi, D. D., Xu, L.

The prediction of evaporation from Mediterranean woodland ecosystems is complicated by an array of climate, soil and plant factors. To provide a mechanistic and process-oriented understanding, we evaluate theoretical and experimental information on water loss of Mediterranean oaks at three scales, the leaf, tree and woodland. …

Journal: Advances In Water Resources, Volume 30 (10): 2113-2122 (2007), ISBN . DOI: 10.1016/j.advwatres.2006.06.013 Sites: US-Ton

Plant Species Composition And Productivity Following Permafrost Thaw And Thermokarst In Alaskan Tundra
Schuur, E. A., Crummer, K. G., Vogel, J. G., Mack, M. C.

Climate warming is expected to have a large impact on plant species composition and productivity in northern latitude ecosystems. Warming can affect vegetation communities directly through temperature effects on plant growth and indirectly through alteration of soil nutrient availability. In addition, warming can cause permafrost …

Journal: Ecosystems, Volume 10 (2): 280-292 (2007), ISBN . DOI: 10.1007/s10021-007-9024-0 Sites: US-EML

Inter-Annual Variability In Carbon Dioxide Exchange Of An Oak/Grass Savanna And Open Grassland In California
Ma, S., Baldocchi, D. D., Xu, L., Hehn, T.

To understand the dynamics of ecosystem carbon cycling, CO₂ fluxes were measured over and under an oak–grass savanna and over a proximate grassland in California. The measurements were made from 2000 to 2006 using the eddy covariance technique. Annual net carbon exchange (NEE) ranged from −155 to −56 gC m⁻² year⁻¹ …

Journal: Agricultural And Forest Meteorology, Volume 147 (3-4): 157-171 (2007), ISBN . DOI: 10.1016/j.agrformet.2007.07.008 Sites: US-Ton, US-Var

Eco-Hydrological Controls On Summertime Convective Rainfall Triggers
Juang, J., Katul, G. G., Porporato, A., Stoy, P. C., Siqueira, M. S., Detto, M., Kim, H., Oren, R.

Triggers of summertime convective rainfall depend on numerous interactions and feedbacks, often compounded by spatial variability in soil moisture and its impacts on vegetation …

Journal: Global Change Biology, Volume 13 (4): 887-896 (2007), ISBN . DOI: 10.1111/j.1365-2486.2007.01315.x Sites: US-Dk3

Refining Light-Use Efficiency Calculations For A Deciduous Forest Canopy Using Simultaneous Tower-Based Carbon Flux And Radiometric Measurements
Jenkins, J., Richardson, A., Braswell, B., Ollinger, S., Hollinger, D., Smith, M.

The concept of light-use efficiency (LUE) is the underlying basis for estimating carbon exchange in many ecosystem models, especially those models that utilize remote sensing to constrain estimates of canopy photosynthesis. An understanding of the factors that control the efficiency with which forest canopies harvest available …

Journal: Agricultural And Forest Meteorology, Volume 143 (1-2): 64-79 (2007), ISBN . DOI: 10.1016/j.agrformet.2006.11.008 Sites: US-Bar

Estimating Basal Area And Stem Volume For Individual Trees From Lidar Data
Chen, Q., Gong, P., Baldocchi, D., Tian, Y. Q.

This study proposes a new metric called canopy geometric volume G, which is derived from small-footprint lidar data, for estimating individual-tree basal area and stem volume. Based on the plant allometry relationship, we found that basal area B is exponentially related to G (B = β₁G^3/4, where β₁ …

Journal: Photogrammetric Engineering & Remote Sensing, Volume 73 (12): 1355-1365 (2007), ISBN . DOI: 10.14358/pers.73.12.1355 Sites: US-Ton

Regional Carbon Fluxes From An Observationally Constrained Dynamic Ecosystem Model: Impacts Of Disturbance, CO2 Fertilization, And Heterogeneous Land Cover
Desai, A.R., Moorcroft, P.R., Bolstad, P.V., and Davis, K.J.

The Ecosystem Demography (ED) model was parameterized with ecological, forest inventory, and historical land use observations in an intensively managed, wetland-rich forested landscape in the upper midwest United States. Model results were evaluated against a regional network of eddy covariance flux towers and analyzed about the …

Journal: Journal Of Geophysical Research: Biogeosciences, Volume 112 (G1): n/a-n/a (2007), ISBN . DOI: 10.1029/2006JG000264 Sites: US-PFa

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