Sensitivity and uncertainty of the carbon balance of a Pacific Northwest Douglas-fir forest during an El Niño/La Niña cycle

Morgenstern, K.; Black, T. Andrew; Humphreys, Elyn; Griffis, Timothy J.; Drewitt, G. B.; Cai, Tiebo; Nesic, Zoran; Spittlehouse, David L.; Livingston, N. J.

doi:10.1016/j.agrformet.2003.12.003

Cited by 262 publications

(212 citation statements)

References 45 publications

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“…The spatial scale of an EC flux tower is about 1 km 2 (Kljun et al 2004) and the temporal resolution is given by the integration of high frequency data, usually at a half hourly basis (Morgenstern et al, 2004). GPP can be determined from EC data by adding estimates of ecosystem respiration (R) to measured NEP values, and can be obtained from additional measurements of f PAR and PAR using radiation sensors above and below the canopy (Humphreys et al, 2006).…”

Section: Validation Approachesmentioning

confidence: 99%

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

Hilker

Coops

Wulder

et al. 2008

Science of The Total Environment

246

173

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Section: Validation Approachesmentioning

confidence: 99%

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

Hilker

Coops

Wulder

et al. 2008

Science of The Total Environment

246

173

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“…Oregon grape (Berberis nervosa Pursh), vanilla-leaf deer foot (Achlys triphylla (Smith) DC), various ferns and mosses (Morgenstern et al, 2004). A 1998 site survey found that the stand density was 1100 stems ha -1 , and tree height was 30-35 m, and the average diameter at breast height (DBH) was 29 cm.…”

Section: Research Areamentioning

confidence: 99%

“…Sarg.) (Morgenstern et al, 2004) and is considered second-growth planted in 1949, after harvesting of the original stand (Goodwin, 1937). The understorey consists mainly of salal (Gaultheria shallon Pursh.…”

Section: Research Areamentioning

confidence: 99%

“…The site is among the most productive in Canada, with harvest rotation cycles as short as 60 years (Morgenstern et al, 2004). The soil is a humo-ferric podzol with a gravelly sandy loam texture and a surface organic layer ranging from 1 to 10 cm in depth.…”

mentioning

confidence: 99%

“…The soil is a humo-ferric podzol with a gravelly sandy loam texture and a surface organic layer ranging from 1 to 10 cm in depth. The total soil C content to 1m is 11.5 kg Cm −2 , of which 2.5 kg Cm −2 is in the surface organic layer (Drewitt et al, 2002, Morgenstern et al, 2004. The research area is part of the dry maritime Coastal Western Hemlock biogeoclimatic subzone (CWHxm) with an average annual precipitation of 1500 mm and mean annual temperature of 8.5ºC (Humphreys et al, 2006 Ltd., Burwell, UK).…”

mentioning

confidence: 99%

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Separating physiologically and directionally induced changes in PRI using BRDF models

Hilker¹,

Coops²,

Hall³

et al. 2008

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Remote sensing‐based estimation of annual soil respiration at two contrasting forest sites

Huang

Black

et al. 2015

JGR Biogeosciences

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Soil respiration (R s ), an important component of the global carbon cycle, can be estimated using remotely sensed data, but the accuracy of this technique has not been thoroughly investigated. In this study, we proposed a methodology for the remote estimation of annual R s at two contrasting FLUXNET forest sites (a deciduous broadleaf forest and an evergreen needleleaf forest). A version of the Akaike's information criterion was used to select the best model from a range of models for annual R s estimation based on the remotely sensed data products from the Moderate Resolution Imaging Spectroradiometer and root-zone soil moisture product derived from assimilation of the NASA Advanced Microwave Scanning Radiometer soil moisture products and a two-layer Palmer water balance model. We found that the Arrhenius-type function based on nighttime land surface temperature (LST-night) was the best model by comprehensively considering the model explanatory power and model complexity at the Missouri Ozark and BC-Campbell River 1949 Douglas-fir sites. In addition, a multicollinearity problem among LST-night, root-zone soil moisture, and plant photosynthesis factor was effectively avoided by selecting the LST-night-driven model. Cross validation showed that temporal variation in R s was captured by the LST-night-driven model with a mean absolute error below 1 μmol CO 2 m À2 s À1 at both forest sites. An obvious overestimation that occurred in 2005 and 2007 at the Missouri Ozark site reduced the evaluation accuracy of cross validation because of summer drought. However, no significant difference was found between the Arrhenius-type function driven by LST-night and the function considering LST-night and root-zone soil moisture. This finding indicated that the contribution of soil moisture to R s was relatively small at our multiyear data set. To predict intersite R s , maximum leaf area index (LAI max ) was used as an upscaling factor to calibrate the site-specific reference respiration rates. Independent validation demonstrated that the model incorporating LST-night and LAI max efficiently predicted the spatial and temporal variabilities of R s . Based on the Arrhenius-type function using LST-night as an input parameter, the rates of annual C release from R s were 894-1027 g C m À2 yr À1 at the BC-Campbell River 1949 Douglas-fir site and 818-943 g C m À2 yr À1 at the Missouri Ozark site. The ratio between annual R s estimates based on remotely sensed data and the total annual ecosystem respiration from eddy covariance measurements fell within the range reported in previous studies. Our results demonstrated that estimating annual R s based on remote sensing data products was possible at deciduous and evergreen forest sites.

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Sensitivity and uncertainty of the carbon balance of a Pacific Northwest Douglas-fir forest during an El Niño/La Niña cycle

Cited by 262 publications

References 45 publications

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

The use of remote sensing in light use efficiency based models of gross primary production: A review of current status and future requirements

Separating physiologically and directionally induced changes in PRI using BRDF models

Remote sensing‐based estimation of annual soil respiration at two contrasting forest sites

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