Carbon dioxide and water vapour exchange from understory species in boreal forest

Heijmans, M.M.P.D.; Arp, Wim J.; Chapin, F. Stuart

doi:10.1016/j.agrformet.2003.12.006

Cited by 96 publications

(89 citation statements)

References 35 publications

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“…spatial variability of soil respiration has been related to the physical (micro-topography, porosity, organic horizon depth, temperature, humidity), chemical (nutrient status of mineral and organic horizons, organic matter quantity and quality) and biological (microbial and fine root biomass, microbial community composition) properties of the soil which can influence either the production of CO 2 , its transport to the surface or both (Fang et al, 1998;Longdoz et al, 2000;Rayment and Jarvis, 2000;Xu and Qi, 2001;Heijmans et al, 2004;Khomik et al, 2006;Saiz et al, 2006). These properties are linked to micro-site structural characteristics that are in turn related to the distribution and composition of mosses and lichens (Bisbee et al, 2001;Sulyma and Coxson, 2001).…”

Section: Figmentioning

confidence: 99%

“…Furthermore, there is apparently little information available for the vast area of cool humid boreal forest that is characteristic of eastern North America. On the other hand, photosynthesis of the moss stratum has been studied in different ecosystems (e.g., Swanson and Flanagan, 2001;Heijmans et al, 2004;Botting and Fredeen, 2006;Kolari et al, 2006). However, the extent to which it might contribute to the interannual variability in gross ecosystem productivity has apparently not been studied for boreal forests of eastern North America.…”

Section: Introductionmentioning

confidence: 99%

“…The productivity of the forest floor depends on favourable light, temperature and moisture conditions O. Bergeron et al: Forest floor carbon exchange of a boreal black spruce forest (Swanson and Flanagan, 2001;Kolari et al, 2006;Tupek et al, 2008) and also on the composition and relative presence of different forest floor communities in the ecosystem (O'Connell et al, 2003;Heijmans et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Forest floor carbon exchange of a boreal black spruce forest in eastern North America

2009

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Abstract. This study reports continuous automated measurements of forest floor carbon (C) exchange over feathermoss, lichen, and sphagnum micro-sites in a black spruce forest in eastern North America during snow-free periods over three years. The response of soil respiration (R s-auto ) and forest floor photosynthesis (P ff ) to environmental factors was determined. The seasonal contributions of scaled up R s-auto adjusted for spatial representativeness (R s-adj ) and P ff (P ff -eco ) relative to that of total ecosystem respiration (R e ) and photosynthesis (P eco ), respectively, were also quantified.Shallow (5 cm) soil temperature explained 67-86% of the variation in R s-auto for all ground cover types, while deeper (50 and 100 cm) soil temperatures were related to R s-auto only for the feathermoss micro-sites. Base respiration was consistently lower under feathermoss, intermediate under sphagnum, and higher under lichen during all three years. The R s-adj /R e ratio increased from spring through autumn and ranged from 0.85 to 0.87 annually for the snow-free period. The R s-adj /R e ratio was negatively correlated with the difference between air and shallow soil temperature and this correlation was more pronounced in autumn than summer and spring.Maximum photosynthetic capacity of the forest floor (P ff max ) saturated at low irradiance levels (∼200 µmol m −2 s −1 ) and decreased with increasing air temperature and vapor pressure deficit for all three ground cover types, suggesting that P ff was more limited by desiccation than by light availability. P ff max was lowest for sphagnum, intermediate for feathermoss, and highest for lichen for two of the three years. P ff normalized for light Correspondence to: O. Bergeron (onil.bergeron@mcgill.ca) peaked at air temperatures of 5-8 • C, suggesting that this is the optimal temperature range for P ff . The P ff -eco /P eco ratio varied from 13 to 24% over the snow-free period and reached a minimum in mid-summer when both air temperature and P eco were at their maximum. On an annual basis, P ff -eco accounted for 17-18% of P eco depending on the year and the snow-free season totals of P ff -eco were 23-24% that of R s-adj .

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Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forest floor carbon exchange of a boreal black spruce forest in eastern North America

2009

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“…Leaf area index (LAI) measured with a plant canopy analyzer (LAI-2000, Li-Cor, USA) above the moss surface was typically 2.0 during summer. The soil is silt-loam overlain by an organic layer of 25−45 cm (Heijmans et al 2004), and it is poorly drained due to the presence of permafrost. The depth of the active layer is 40−50 cm.…”

Section: Mature Forest Sitementioning

confidence: 99%

Quick Recovery of Carbon Dioxide Exchanges in a Burned Black Spruce Forest in Interior Alaska

Iwata

Ueyama

Harazono

et al. 2011

SOLA

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Observations of carbon dioxide (CO 2 ) flux with the eddy covariance technique were conducted at a burned boreal forest site five years after a wildfire and at a mature forest site in Interior Alaska to investigate the effects of wildfire on CO 2 exchange in a boreal forest. Both gross primary productivity and ecosystem respiration were lower at the burned site. The lower amount of vegetation explains the lower gross primary productivity and ecosystem respiration at the burned site. The reduced soil organic layer at the burned site further explains the lower respiration. On an annual basis, the five-year-old burned site was a CO 2 sink, which indicated earlier recovery of CO 2 exchange compared to other burned boreal forests in North America reported in the literature. The quick recovery of net CO 2 exchange is associated with constrained heterotrophic respiration, rather than recovery of vegetation. Burn severity can be a key variable in determining CO 2 exchange during the early stage of succession after wildfire.

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“…This has resulted in the changes in global carbon cycle and carbon budget, and induced climate warming and other global climate change problems, which threaten human survival and sustainable development (Yu et al, 2001). Terrestrial ecosystems are vital in climate system, for they not only change passively with climate change, but have significant feedback on biogeochemical cycle and climate system (Heijmans et al, 2004). It is necessary to develop long-term monitoring to estimate precisely terrestrial ecosystem carbon budget.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation and meteorological control of CO2 flux in a hilly plantation in the mountain areas of North China

et al. 2011

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The carbon cycle of terrestrial ecosystems is an important scientific issue in global climate change research. Plantation forest plays an important role in terrestrial carbon budget in China. In this study, eddy covariance flux data measured at Xiaolangdi forest ecosystem research station (XLD) in 2007 and 2008 are used to analyze the seasonal variation and meteorological control of CO 2 flux in a 30-yr-old mixed plantation. The plantation forest mainly consists of Quercus variabilis, Platycladus orientalis, and Robinia pseudoacacia. The results show that the seasonal variations of net ecosystem exchange of CO 2 (NEE), gross primary production (GPP), and ecosystem respiration (R e) display single-peak curves. The maximum of carbon sequestration appears during May and June each year. The relative contribution of carbon release from ecosystem respiration to GPP varied slightly between 2007 and 2008. The relationship between NEE and photosynthetic active radiation (Q p) accords with the rectangular hyperbola model on diurnal scale, and shows a good linear correlation on monthly scale. The ecosystem photosynthetic parameters: the maximum photosynthetic rate (P max), the ecosystem photosynthetic photonyield (α), and the daytime ecosystem respiration (R d ) exhibit seasonal variations. Pmax reaches the maximum in August each year, with small interannual difference. The interannual differences of α and R d are obvious, which is attributed to the changes of meteorological factors, such as solar radiation, vapor pressure deficit (D), precipitation, etc. Parameters R e, GPP, and NEP (net ecosystem production) have obvious exponential relations with temperature on monthly scale. There is a hysteresis in the response of GPP and NEP to temperature, i.e., the carbon sequestration is not the maximum when the temperature reaches the peak value. The Q 10 values were 1.37 and 1.45 in 2007 and 2008, respectively. On monthly scale, R e, GPP, and NEE increase as D increases, but rise slowly and even decrease when D is higher than 1.5 kPa.

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Carbon dioxide and water vapour exchange from understory species in boreal forest

Cited by 96 publications

References 35 publications

Forest floor carbon exchange of a boreal black spruce forest in eastern North America

Forest floor carbon exchange of a boreal black spruce forest in eastern North America

Quick Recovery of Carbon Dioxide Exchanges in a Burned Black Spruce Forest in Interior Alaska

Seasonal variation and meteorological control of CO2 flux in a hilly plantation in the mountain areas of North China

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