Publications

Publications Found: 1437

Net Carbon Fluxes From Forest Clearance And Regrowth In The Amazon
Steininger, M. K.

Estimates of net carbon exchange resulting from forest clearance and regrowth were made for three areas in the Brazilian and Bolivian Amazon. The study areas, ranging in size from 600 to 10 000 km2, include communities that practice a range of land uses from small-scale, rotational agriculture to long-term pasture. Carbon …


Journal: Ecological Applications, Volume 14 (sp4): 313-322 (2004). DOI: 10.1890/02-6007 Sites: BR-Sa3

Interannual And Seasonal Variation In Fluxes Of Water And Carbon Dioxide From A Riparian Woodland Ecosystem
Scott, R. L., Edwards, E. A., Shuttleworth, W., Huxman, T. E., Watts, C., Goodrich, D. C.

Fluxes of water, energy and carbon dioxide (CO2) were measured using the eddy covariance technique over a mesquite (Prosopis velutina) woodland along the San Pedro River in southeastern Arizona for the entire growing seasons of 2001 and 2002, between the last freeze event of spring and the first of fall. Although the general pattern …


Journal: Agricultural And Forest Meteorology, Volume 122 (1-2): 65-84 (2004). DOI: 10.1016/j.agrformet.2003.09.001 Sites: US-CMW

Carbon Dioxide Exchange Between An Old-Growth Forest And The Atmosphere
Paw U, K., Falk, M., Suchanek, T., Ustin, S., Chen, J., Park, Y., Winner, W., Thomas, S., Hsiao, T., Shaw, R., King, T., Pyles, R., Schroeder, M., Matista, A.

Eddy-covariance and biometeorological methods show significant net annual carbon uptake in an old-growth Douglas-fir forest in southwestern Washington, USA. These results contrast with previous assumptions that old-growth forest ecosystems are in carbon …


Journal: Ecosystems, Volume 7 (5): 513-524 (2004). DOI: 10.1007/s10021-004-0141-8 Sites: US-Wrc

Rapid And Transient Response Of Soil Respiration To Rain
Lee, X., Wu, H., Sigler, J., Oishi, C., Siccama, T.

The influence of rainstorm on soil respiration of a mixed forest in southern New England, USA was investigated with eddy covariance, rain simulation and laboratory incubation. …


Journal: Global Change Biology, Volume 10 (6): 1017-1026 (2004). DOI: 10.1111/j.1529-8817.2003.00787.x Sites: US-GMF

Airflows And Turbulent Flux Measurements In Mountainous Terrain: Part 2: Mesoscale effects
Turnipseed, A. A., Anderson, D. E., Burns, S., Blanken, P. D., Monson, R. K.

The location of the Niwot Ridge Ameriflux site within the rocky mountains subjects it to airflows which are common in mountainous terrain. In this study, we examine the effects of some of these mesoscale features on local turbulent flux measurements; most notably, the formation of valley/mountain flows and mountain lee-side …


Journal: Agricultural And Forest Meteorology, Volume 125 (3-4): 187-205 (2004). DOI: 10.1016/j.agrformet.2004.04.007 Sites: US-NR1

How Soil Moisture, Rain Pulses, And Growth Alter The Response Of Ecosystem Respiration To Temperature
Xu, L., Baldocchi, D. D., Tang, J.

 In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration …


Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004). DOI: 10.1029/2004gb002281 Sites: US-Ton, US-Var

On The Construction And Calibration Of Dual-Probe Heat Capacity Sensors
Ham, J. M., Benson, E. J.

Dual-probe heat-capacity (DPHC) sensors can be used to measure soil heat capacity (C), water content, and temperature. Research was conducted to test design factors that affect sensor calibration, including: (i) calibration media, (ii) diameter and length of the needle probes, (iii) sensor body material, and (vi) duration …


Journal: Soil Science Society Of America Journal, Volume 68 (4): 1185-1190 (2004). DOI: 10.2136/sssaj2004.1185 Sites: CA-Mer

Supply-Side Controls On Soil Respiration Among Oregon Forests
Campbell, J. L., Sun, O. J., Law, B. E.

To test the hypothesis that variation in soil respiration is related to plant production across a diverse forested landscape, we compared annual soil respiration rates with net primary production and the subsequent allocation of carbon to various ecosystem pools, including leaves, fine roots, forests floor, and mineral soil for 36 …


Journal: Global Change Biology, Volume 10 (11): 1857-1869 (2004). DOI: 10.1111/j.1365-2486.2004.00850.x Sites: US-Me2, US-Me4, US-Me5

Disturbance And Net Ecosystem Production Across Three Climatically Distinct Forest Landscapes
Campbell, J. L., Sun, O. J., Law, B. E.

Biometric techniques were used to measure net ecosystem production (NEP) across three climatically distinct forest chronosequences in Oregon. NEP was highly negative immediately following stand-replacing disturbance in all forests and recovered to positive values by 10, 20, and 30 years of age for the mild and mesic Coast Range, …


Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004). DOI: 10.1029/2004gb002236 Sites: US-Me2, US-Me4

Age-Related Changes In Ecosystem Structure And Function And Effects On Water And Carbon Exchange In Ponderosa Pine
Irvine, J., Law, B. E., Kurpius, M. R., Anthoni, P. M., Moore, D., Schwarz, P. A.

As forests age, their structure and productivity change, yet in some cases, annual rates of water loss remain unchanged. To identify mechanisms that might explain such observations, and to determine if widely different age classes of forests differ functionally, we examined young (Y, 25 years), mature (M, 90 years) …


Journal: Tree Physiology, Volume 24 (7): 753-763 (2004). DOI: 10.1093/treephys/24.7.753 Sites: US-Me4, US-Me5