An initial intercomparison of micrometeorological and ecological inventory estimates of carbon exchange in a mid‐latitude deciduous forest

Ehman, Jeffrey L.; Schmid, Hans‐Peter; Grimmond, Sue; Randolph, J. C.; Hanson, Paul J.; Wayson, Craig; Cropley, Ford

doi:10.1046/j.1365-2486.2002.00492.x

Cited by 109 publications

(92 citation statements)

References 39 publications

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“…From these definitions, the NEP was regarded as the net carbon budget of ecosystems (NRCB). For natural ecosystems, which had no strong natural and anthropogenic disturbances, previous studies showed that the NEP obtained by the biomass inventory method and eddy covariance method agreed well with each other [80][81][82]. However, for ecosystems strongly affected by human activities at a regional scale (biomesociety system), especially at a long-term scale, anthropogenic and natural disturbances still exist, including food collection, timber harvesting, burning of plant residues, fires, water erosion and other geological processes that cause carbon leakage.…”

Section: Carbon Budget Components Of Terrestrial Ecosystems In Chinamentioning

confidence: 65%

Primary estimation of Chinese terrestrial carbon sequestration during 2001–2010

et al. 2015

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Quantifying the carbon budgets of terrestrial ecosystems is the foundation on which to understand the role of these ecosystems as carbon sinks and to mitigate global climate change. Through a re-examination of the conceptual framework of ecosystem productivity and the integration of multi-source data, we assumed that the entire terrestrial ecosystems in China to be a large-scale regional biome-society system. We approximated the carbon fluxes of key natural and anthropogenic processes at a regional scale, including fluxes of emissions from reactive carbon and creature ingestion, and fluxes of emissions from anthropogenic and natural disturbances. The gross primary productivity, ecosystem respiration and net ecosystem productivity (NEP) in China were 7.78, 5.89 and 1.89 PgC a -1 , respectively, during the period from 2001 to 2010. After accounting for the consumption of reactive carbon and creature ingestion (0.078 PgC a -1 ), fires (0.002 PgC a -1 ), water erosion (0.038 PgC a -1 ) and agricultural and forestry utilization (0.806 PgC a -1 ), the final carbon sink in China was about 0.966 PgC a -1 ; this was considered as the climate-based potential terrestrial ecosystem carbon sink for the current climate conditions in China. The carbon emissions caused by anthropogenic disturbances accounted for more than 42 % of the NEP, which indicated that humans can play an important role in increasing terrestrial carbon sequestration and mitigating global climate change. This role can be fulfilled by reducing the carbon emissions caused by human activities and by prolonging the residence time of fixed organic carbon in the large-scale regional biome-society system through the improvement of ecosystem management.

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Section: Carbon Budget Components Of Terrestrial Ecosystems In Chinamentioning

confidence: 65%

Primary estimation of Chinese terrestrial carbon sequestration during 2001–2010

et al. 2015

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“…In a study performed in five North American deciduous forests (Curtis et al, 2002), such discrepancies were observed between NEE and BI, with the largest difference being 220 g C m −2 y −1 . In a North American mixed deciduous forest, Ehman et al (2002) reported estimates of carbon uptake from inventories to be 34 and 90 g C m −2 y −1 higher for two successive years, than from eddy covariance measurements. In a mixed hardwood forest, both estimates agreed within 5% (Schmid et al, 2000).…”

Section: Tree Biomass Increment and Delayed Effects Of Droughtmentioning

confidence: 91%

Ten years of fluxes and stand growth in a young beech forest at Hesse, North-eastern France

et al. 2008

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Keywords:Carbon balance / evapotranspiration / climate / biomass increment / interannual variability / net primary productivity / drought / Fagus sylvatica Abstract • Water and carbon fluxes, as measured by eddy covariance, climate, soil water content, leaf area index, tree biomass, biomass increment (BI), litter fall and mortality were monitored for 10 successive years in a young beech stand in Hesse forest (north-eastern France) under contrasting climatic and management conditions.• Large year-to-year variability of net carbon fluxes (NEE) and to a lesser extent, of tree growth was observed. The variability in NEE (coefficient of variation, CV = 44%) was related to both gross primary production (GPP) and to variations in total ecosystem respiration (TER), each term showing similar and lower interannual variability (CV = 14%) than NEE. Variation in the annual GPP was related to: (i) the water deficit duration and intensity cumulated over the growing season, and (ii) the growing season length, i.e. the period of carbon uptake by the stand. Two thinnings occurring during the observation period did not provoke a reduction in either GPP, water fluxes, or in tree growth. Interannual variation of TER could not be explained by any annual climatic variables, or LAI, and only water deficit duration showed a poor correlation. Annual biomass increment was well correlated to water shortage duration and was significantly influenced by drought in the previous year.• The relationship between annual NEE and biomass increment (BI) was poor: in some years, the annual carbon uptake was much higher and in others much lower than tree growth. However this relationship was much stronger and linear (r 2 = 0.93) on a weekly to monthly time-scale from budburst to the date of radial growth cessation, indicating a strong link between net carbon uptake and tree growth, while carbon losses by respiration occurring after this date upset this relationship.• Despite the lack of correlation between annual data, the NEE and BI cumulated over the 10 years of observations were very close.• On the annual time-scale, net primary productivity calculated from eddy fluxes and from biological measurements showed a good correlation. Mots-clés :bilan de carbone / évapotranspiration / climat / accroissement en biomasse / variabilité interannuelle / productivité primaire nette / contrainte hydrique / Fagus sylvatica Résumé -Dix années de mesures de flux et de croissance dans une jeune hêtraie du nord-est de la France, en forêt de Hesse.• Les flux d'eau et de dioxyde de carbone, mesurés par la méthode des corrélations turbulentes, le climat, le contenu en eau du sol, l'indice foliaire, la biomasse et l'accroissement en biomasse (BI) des arbres, les chutes de litière et la mortalité ont été suivis en continu pendant 10 années successives dans une jeune hêtraie de la forêt de Hesse (nord-est de la France) en conditions de climat et de gestion contrastées.• Une forte variabilité interannuelle des flux nets de carbone (NEE) et dans une moindre mesure de la crois...

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“…In southern pine forests, most of the belowground biomass is in coarse roots Laiho and Finer 1996;Johnsen et al 2001). Coarse-root and stump biomass has been found to increase with the age of the stand, constituting up to 90% of the total living root biomass (Laiho and Finer 1996;Ehman et al 2002). Following harvest or natural tree mortality, root systems become a ''source'' of carbon as they decay in a negative exponential Carbon content of root systems is estimated at the time of harvest, representing the maximum amount of C in decomposing roots pattern over decades, releasing CO 2 to the atmosphere.…”

Section: Discussionmentioning

confidence: 99%

Accounting Carbon Storage in Decaying Root Systems of Harvested Forests

Wang

Lear

Kapeluck

2011

AMBIO

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Decaying root systems of harvested trees can be a significant component of belowground carbon storage, especially in intensively managed forests where harvest occurs repeatedly in relatively short rotations. Based on destructive sampling of root systems of harvested loblolly pine trees, we estimated that root systems contained about 32% (17.2 Mg ha -1 ) at the time of harvest, and about 13% (6.1 Mg ha -1 ) of the soil organic carbon 10 years later. Based on the published roundwood output data, we estimated belowground biomass at the time of harvest for loblolly-shortleaf pine forests harvested between 1995 and 2005 in South Carolina. We then calculated C that remained in the decomposing root systems in 2005 using the decay function developed for loblolly pine. Our calculations indicate that the amount of C stored in decaying roots of loblolly-shortleaf pine forests harvested between 1995 and 2005 in South Carolina was 7.1 Tg. Using a simple extrapolation method, we estimated 331.8 Tg C stored in the decomposing roots due to timber harvest from 1995 to 2005 in the conterminous USA. To fully account for the C stored in the decomposing roots of the US forests, future studies need (1) to quantify decay rates of coarse roots for major tree species in different regions, and (2) to develop a methodology that can determine C stock in decomposing roots resulting from natural mortality.

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An initial intercomparison of micrometeorological and ecological inventory estimates of carbon exchange in a mid‐latitude deciduous forest

Cited by 109 publications

References 39 publications

Primary estimation of Chinese terrestrial carbon sequestration during 2001–2010

Primary estimation of Chinese terrestrial carbon sequestration during 2001–2010

Ten years of fluxes and stand growth in a young beech forest at Hesse, North-eastern France

Accounting Carbon Storage in Decaying Root Systems of Harvested Forests

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