CO2 fluxes over an old, temperate mixed forest in northeastern China

Guan, Dexin; Wu, Jiabing; Zhao, Xiaoyan; Han, Shijie; Yu, Guirui; Sun, Xiaomin; Jin, Changjie

doi:10.1016/j.agrformet.2006.02.003

Cited by 103 publications

(63 citation statements)

References 33 publications

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“…With the exception of the original and spike-removed fluxes, the daytime fluxes show remarkable similarity between processing approaches, peaking at around −12 µmols CO 2 m −2 s −1 in June. However, the use of different techniques and corrections when processing raw flux data can have a large impact upon NEE (Guan et al, 2006;Zhang et al, 2006). In our study, there is a marked difference between the night-time average hourly fluxes for secondary stage processing approaches.…”

Section: Meteorological Datamentioning

confidence: 78%

“…Valentini et al, 1996). An unmanaged mixed temperate forest in northeast China, parts of which are estimated to be greater than 450 years old, yielded an estimated carbon sink of around 2 Mg C ha −1 yr −1 (Guan et al, 2006), with vapour pressure deficits acting to restrict further carbon assimilation. Although NEP may decline with stand age (Ryan et al, 1997), mature temperate deciduous forests still have the potential to act as carbon sinks through natural regeneration, diversity of vegetation age and species turnover (Luyssaert et al, 2008) and possibly increased tree growth through CO 2 fertilisation, earlier bud-break or increased nutrient availability.…”

Section: Comparison With Other Woodlandsmentioning

confidence: 99%

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Carbon dioxide fluxes over an ancient broadleaved deciduous woodland in southern England

et al. 2011

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Abstract.We present results from a study of canopyatmosphere fluxes of carbon dioxide from 2007 to 2009 above a site in Wytham Woods, an ancient temperate broadleaved deciduous forest in southern England. Gapfilled net ecosystem exchange (NEE) data were partitioned into gross primary productivity (GPP) and ecosystem respiration (R e ) and analysed on daily, monthly and annual timescales. Over the continuous 24 month study period annual GPP was estimated to be 21.1 Mg C ha −1 yr −1 and R e to be 19.8 Mg C ha −1 yr −1 ; net ecosystem productivity (NEP) was 1.2 Mg C ha −1 yr −1 . These estimates were compared with independent bottom-up estimates derived from net primary productivity (NPP) and flux chamber measurements recorded at a plot within the flux footprint in 2008 (GPP = 26.5 ± 6.8 Mg C ha −1 yr −1 , R e = 24.8 ± 6.8 Mg C ha −1 yr −1 , biomass increment = ∼1.7 Mg C ha −1 yr −1 ). Over the two years the difference in seasonal NEP was predominantly caused by changes in ecosystem respiration, whereas GPP remained similar for equivalent months in different years. Although solar radiation was the largest influence on daily values of CO 2 fluxes (R 2 = 0.53 for the summer months for a linear regression), variation in R e appeared to be driven by temperature. Our findings suggest that this ancient woodland site is currently a substantial sink for carbon, resulting from continued growth that is probably a legacy of past management practices abandoned over 40 years ago. Our GPP and R e values are generally higher than other broadleaved temperate deciduous woodlands and may represent the influence of the UK's maritime climate, or the particular species composition of this site. The carbon sink value of Wytham Woods Correspondence to: Y. Malhi (yadvinder.malhi@ouce.ox.ac.uk) supports the protection and management of temperate deciduous woodlands (including those managed for conservation rather than silvicultural objectives) as a strategy to mitigate atmospheric carbon dioxide increases.

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Section: Meteorological Datamentioning

confidence: 78%

Section: Comparison With Other Woodlandsmentioning

confidence: 99%

Carbon dioxide fluxes over an ancient broadleaved deciduous woodland in southern England

et al. 2011

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“…The anemometer and the infrared gas analyzer (IRGA) provide digital outputs of the three wind components, sonic temperature, water vapor, and CO2 density. Raw data were recorded at a frequency of 10 Hz and stored every 10 s as the 30 min averages into separate files [39]. …”

Section: Study Areamentioning

confidence: 99%

Narrowband Bio-Indicator Monitoring of Temperate Forest Carbon Fluxes in Northeastern China

Wang

Mickler

et al. 2014

Remote Sensing

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Developments in hyperspectral remote sensing techniques during the last decade have enabled the use of narrowband indices to evaluate the role of forest ecosystem variables in estimating carbon (C) fluxes. In this study, narrowband bio-indicators derived from EO-1 Hyperion data were investigated to determine whether they could capture the temporal variation and estimate the spatial variability of forest C fluxes derived from eddy covariance tower data. Nineteen indices were divided into four categories of optical indices: broadband, chlorophyll, red edge, and light use efficiency. Correlation tests were performed between the selected vegetation indices, gross primary production (GPP), and ecosystem respiration (Re). Among the 19 indices, five narrowband indices (Chlorophyll Index RedEdge 710, scaled photochemical reflectance index (SPRI)*enhanced vegetation index (EVI), SPRI*normalized difference vegetation index (NDVI), MCARI/OSAVI [705, 750] and the Vogelmann Index), and one broad band index (EVI) had R-squared values with a good fit for GPP and Re. The SPRI*NDVI has the highest significant coefficients of determination OPEN ACCESSRemote Sens. 2014, 6 8987 with GPP and Re (R 2 = 0.86 and 0.89, p < 0.0001, respectively). SPRI*NDVI was used in atmospheric inverse modeling at regional scales for the estimation of C fluxes. We compared the GPP spatial patterns inversed from our model with corresponding results from the Vegetation Photosynthesis Model (VPM), the Boreal Ecosystems Productivity Simulator model, and MODIS MOD17A2 products. The inversed GPP spatial patterns from our model of SPRI*NDVI had good agreement with the output from the VPM model. The normalized difference nitrogen index was well correlated with measured C net ecosystem exchange. Our findings indicated that narrowband bio-indicators based on EO-1 Hyperion images could be used to predict regional C flux variations for Northeastern China's temperate broad-leaved Korean pine forest ecosystems.

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“…Yu et al, 2013b;Chen et al, 2014;FLUXNET, 2013;Du et al, 2012;Wang et al, 2008;Liu et al, 2011aLiu et al, , 2011bDong et al, 2011aDong et al, , 2011bZhang et al, 2007 Grassland Yu et al, 2013b;Chen et al, 2014 Cool temperate forests showed lower carbon sink compared to warm temperate and temperate forests. Studies of specific ecosystem suggest that mature forests in Northeast, Southeast, and Southwest (Zhang et al, 2006a;Liu et al, 2014a;Tan et al, 2010Tan et al, , 2012Guan et al, 2006;Zhang et al, 2006b;Yan et al, 2012) and subtropical plantations (Liu et al, 2006;Wen et al, 2010) had strong carbon sequestration capacity. The carbon sink magnitude of grasslands was obviously lower than that of forests.…”

Section: Evaluation Of Ecosystem Carbon Sink/source Based On Flux Meamentioning

confidence: 99%

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

Wang

Chen

et al. 2016

J. Geogr. Sci.

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Eddy Covariance technique (EC) achieves the direct measurement on ecosystem carbon, nitrogen and water fluxes, and it provides scientific data for accurately assessing ecosystem functions in mitigating global climate change. This paper briefly reviewed the construction and development of Chinese terrestrial ecosystem flux observation and research network (ChinaFLUX), and systematically introduced the design principle and technology of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation system of ChinaFLUX. In addition, this paper summarized the main progress of ChinaFLUX in the ecosystem carbon, nitrogen and water exchange and environmental controlling mechanisms, the spatial pattern of carbon, nitrogen and water fluxes and biogeographical mechanisms, and the regional terrestrial ecosystem carbon budget assessment. Finally, the prospects and emphases of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation of ChinaFLUX are put forward to provide theoretical references for the development of flux observation and research in China.

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CO2 fluxes over an old, temperate mixed forest in northeastern China

Cited by 103 publications

References 33 publications

Carbon dioxide fluxes over an ancient broadleaved deciduous woodland in southern England

Carbon dioxide fluxes over an ancient broadleaved deciduous woodland in southern England

Narrowband Bio-Indicator Monitoring of Temperate Forest Carbon Fluxes in Northeastern China

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

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