Year‐round measurements of net ecosystem CO<sub>2</sub> flux over a montane larch forest in Mongolia

Li, Shenggong

doi:10.1029/2004jd005453

Cited by 46 publications

(35 citation statements)

References 89 publications

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“…forest, mixed with scattered or patchy B. platyphylla trees in some places. It is on a southwest-facing, gently sloping hill of the Khentii Mountains located about 25 km northeast of the Mongonmorit village in the Tov province of Mongolia (Li et al 2005). The mean stand height and density are 20 m and 1120 trees ha , respectively.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Larix species also have been planted intensively throughout northern Japan and China, because of their high cold tolerance and timber productivity (Hirata et al 2007). For these reasons, it is important to gain a comprehensive understanding of the carbon and energy exchange characteristics of larch forests (Li et al 2005;Machimura et al 2005;Wang et al 2005b;Hirata et al 2007;Nakai et al 2008;Ohta et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia

Takagi

Hirata

Ide

et al. 2015

Soil Science and Plant Nutrition

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Larch (Larix spp.) forests are predominantly distributed across high latitudes of Eurasia. They potentially have a strong influence on the terrestrial carbon and energy cycles, because of their vast area and the large carbon stocks in their peat soils in the permafrost. In this study, we elucidated intersite variation of ecosystem photosynthetic and respiratory parameters of eight larch forests in East Asia using the CarboEastAsia carbon flux and micrometeorology dataset. These parameters were determined using the empirical relationship between the carbon fluxes (photosynthesis and respiration) and micrometeorological variables (light and temperature). In addition, we examined leaf area index (LAI) determined by Moderate Resolution Imaging Spectroradiometer (MODIS) remote sensing data to explain the intersite variation. Linear or exponential relationships with annual mean temperature or seasonal maximum LAI at the study sites were found for the annual carbon fluxes (gross primary production [GPP] and total ecosystem respiration [RE]) as well as for four of the five seasonal maximum values of determined photosynthetic and respiratory parameters (maximum GPP at light saturation, initial slope of the light-response curve, daytime respiration, and RE at the reference temperature of 10°C). Phenological indices, such as start day of the growing season, growing season length and growing season degree days explained much of the intersite variation of GPP and RE of the studied larch forests; however, the relationship between MODIS LAI and photosynthetic or respiratory parameters implies that the intersite variation in GPP and RE was caused not only by the temperature variation (abiotic factor), but also by the variation in the photosynthetic and respiration activity by vegetation (biotic factor) through the change in leaf (or whole vegetation) biomass. Our analysis shows that MODIS LAI serves as a good index to explain the variation of the ecosystem photosynthetic and respiratory characteristics of East Asian larch forests.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia

Takagi

Hirata

Ide

et al. 2015

Soil Science and Plant Nutrition

Self Cite

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“…SKT is a Siberian larch (Larix sibirica) forest located at approximately 25 km northeast of the Mongonmorit village in the Tov province of Mongolia (Li et al, 2005(Li et al, , 2006(Li et al, , 2007. The age structure of the larch ranged from ∼ 70 to over 150 years old, but the oldest trees were older than 300 years.…”

Section: Site Descriptionsmentioning

confidence: 99%

“…Across Eurasia to East Asia, a number of eddy covariance measurements have been conducted for several larch forests near the arctic (e.g. Ohta et al, 2001;Machimura et al, 2005;Nakai et al, 2008) and over boreal (Wang et al, 2005;Li et al, 2005) and cool temperate (Hirata et al, 2007) regions. These measurements have revealed the important processes that determine the carbon and water cycles in larch forests, such as the environmental factors that control evapotranspiration and carbon flux (Hollinger et al, 1998;Wang et al, 2005;Li et al, 2005;Hirata et al, 2007;Nakai et al, 2008), and the role of stand disturbance (Machimura et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Simulating carbon and water cycles of larch forests in East Asia by the BIOME-BGC model with AsiaFlux data

et al. 2010

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Abstract. Larch forests are widely distributed across many cool-temperate and boreal regions, and they are expected to play an important role in global carbon and water cycles. Model parameterizations for larch forests still contain large uncertainties owing to a lack of validation. In this study, a process-based terrestrial biosphere model, BIOME-BGC, was tested for larch forests at six AsiaFlux sites and used to identify important environmental factors that affect the carbon and water cycles at both temporal and spatial scales.The model simulation performed with the default deciduous conifer parameters produced results that had large differences from the observed net ecosystem exchange (NEE), gross primary productivity (GPP), ecosystem respiration (RE), and evapotranspiration (ET). Therefore, we adjusted several model parameters in order to reproduce the observed rates of carbon and water cycle processes. This model calibration, performed using the AsiaFlux data, substantially improved the model performance. The simulated annual GPP, RE, NEE, and ET from the calibrated model were highly consistent with observed values.The observed and simulated GPP and RE across the six sites were positively correlated with the annual mean air temCorrespondence to: M. Ueyama (miyabi-flux@muh.biglobe.ne.jp) perature and annual total precipitation. On the other hand, the simulated carbon budget was partly explained by the stand disturbance history in addition to the climate. The sensitivity study indicated that spring warming enhanced the carbon sink, whereas summer warming decreased it across the larch forests. The summer radiation was the most important factor that controlled the carbon fluxes in the temperate site, but the VPD and water conditions were the limiting factors in the boreal sites. One model parameter, the allocation ratio of carbon between belowground and aboveground, was site-specific, and it was negatively correlated with the annual climate of annual mean air temperature and total precipitation. Although this study substantially improved the model performance, the uncertainties that remained in terms of the sensitivity to water conditions should be examined in ongoing and long-term observations.

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“…Such anomalous atmospheric patterns linked together in distant regions (thousands of kilometers) are called teleconnections, and the phenomenon has been studied in terms of atmospheric dynamics (e.g., Limpasuvan and Hartmann, 1999;Yamazaki and Shinya, 1999;Kimoto et al, 2001;Nakamura and Fukamachi, 2004). Although the mechanisms of the extreme weather conditions in the 2003 summer have not been fully clarified, such meteorological phenomena will provide valuable information to estimate impacts of large-scale climatic disturbances on the terrestrial carbon cycle at continental scale.…”

Section: Gpp In Continental Scalementioning

confidence: 99%

Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia

et al. 2010

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Abstract. Northern Eurasia experienced anomalous weather conditions in the 2003 summer. We examined how forest ecosystems responded to the meteorological anomalies during the period using the dataset collected at flux monitoring sites in Asia, including a boreal forest in Mongolia, temperate forests in China and Japan, and a sub-tropical forest in China, as well as the dataset from satellite remote sensing. From July to August 2003, an active rain band stayed in the mid-latitude in East Asia for an unusually long period. Under the influence of the rain band, the Gross Primary Production (GPP), of temperate forests was 20-30% lower in the 2003 summer than in other years due to significant reduction in the Photosynthetic Photon Flux Density (PPFD). The GPP of a cool-temperate forest in the north of the rain band was slightly enhanced by the higher PPFD; however, the GPP of a sub-tropical forest located in the south of the rain band was reduced by drought stress due to extremely hot and dry conditions. The correlation coefficients for the year-to-year changes in the PPFD and GPP during mid-summer were calculated, and the spatial distribution was examined. The spatial pattern of the PPFD was calculated by satellite data, and that of the GPP was estimated by a regression-type model,Correspondence to: N. Saigusa (n.saigusa@nies.go.jp) which was trained and tested by ground observation data. The correlation was positive in the mid-and high-latitudes since light was an essential factor of the summer GPP. On the other hand, a negative correlation appeared in the lower latitudes, suggesting that the water limitation was much more important than the PPFD in the region. Our study illustrated that the integration of flux data from wide areas by combining satellite remote sensing data can help us gain an understanding of the ecosystem responses to large-scale meteorological phenomena.

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Year‐round measurements of net ecosystem CO₂ flux over a montane larch forest in Mongolia

Cited by 46 publications

References 89 publications

Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia

Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia

Simulating carbon and water cycles of larch forests in East Asia by the BIOME-BGC model with AsiaFlux data

Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia

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Year‐round measurements of net ecosystem CO2 flux over a montane larch forest in Mongolia

Cited by 46 publications

References 89 publications

Spatial and seasonal variations of CO2flux and photosynthetic and respiratory parameters of larch forests in East Asia

Spatial and seasonal variations of CO2flux and photosynthetic and respiratory parameters of larch forests in East Asia

Simulating carbon and water cycles of larch forests in East Asia by the BIOME-BGC model with AsiaFlux data

Impact of meteorological anomalies in the 2003 summer on Gross Primary Productivity in East Asia

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Year‐round measurements of net ecosystem CO₂ flux over a montane larch forest in Mongolia

Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia

Spatial and seasonal variations of CO₂flux and photosynthetic and respiratory parameters of larch forests in East Asia