Using cover measurements to estimate aboveground understorey biomass in Maritime pine stands

Porté, Annabel J.; Samalens, Jean‐Charles; Dulhoste, Raphaël; Cros, Rémi Teissier Du; Bosc, Alexandre; Meredieu, Céline

doi:10.1051/forest/2009005

Cited by 26 publications

(15 citation statements)

References 34 publications

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“…The total carbon storage was only 0.3-2.9 Mg ha -1 , with an average of 1.0 Mg ha -1 . These values are lower than those obtained for Pinus pinaster stands in the south west of France, with mean carbon stocks for the understorey of 1.7 Mg ha -1 and a range of 0.7-4.1 Mg ha -1 (Porté et al 2009). Under our conditions, the aboveground carbon stocks in the understorey decrease with increasing cork oak stand density, which can be explained by the competition for light between trees and the understorey.…”

Section: Iforest -Biogeosciences and Forestrycontrasting

confidence: 63%

Carbon storage in degraded cork oak (Quercus suber) forests on flat lowlands in Morocco

Oubrahim¹,

Boulmane²,

Bakker³

et al. 2016

iForest

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The present study aims to quantify the carbon stored in a degraded cork oak (Quercus suber L.) ecosystem in the north west of Morocco, in view of potential management implications. To this end, carbon stocks were evaluated in the first 100 cm of the soil, the cork oak trees, and the understorey species (both above-and belowground). Results show that the total carbon stocks in the cork oak ecosystem ranges from 65 to 237 Mg ha -1 with a mean value of 121 Mg ha -1 . The first 100 cm of the soil (including the forest floor) represents the largest carbon pool (~51% of the total organic carbon) of the ecosystem. Tree biomass (above-and belowground tissues of cork oak) represents the second largest pool (47%), whereas the contribution of the understorey is less than 2%. Within the first 100 cm of the soil, over 87% of all the soil organic carbon is situated in the first 40 cm of the soil depth. The amount of carbon stored here ranges from 30 to 110 Mg ha -1 and these organic carbon stocks vary considerably with the stand basal area of the cork oak (R 2 = 0.82). In practice, the carbon stocks of the different pools considered are strongly correlated with the stand density of the cork oak stands. In the semi-arid forest ecosystems of our study, management prescriptions aiming at increasing the standing biomass of the cork oak should thus considerably contribute, both directly through tree biomass and indirectly through increased soil organic matter, to efficient carbon sequestration.

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Section: Iforest -Biogeosciences and Forestrycontrasting

confidence: 63%

Carbon storage in degraded cork oak (Quercus suber) forests on flat lowlands in Morocco

Oubrahim¹,

Boulmane²,

Bakker³

et al. 2016

iForest

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“…One exception is Godinho-Ferreira et al (2005), which, using NFI data, indicate that closed P. pinaster forests in Portugal typically have higher shrub cover than open stands. For this species, Porté et al (2009) did not found any significant relationship between overstory stand variables and understory cover in south-western France.…”

Section: Mean Response Modelscontrasting

confidence: 61%

Shrub fuel characteristics estimated from overstory variables in NW Spain pine stands

Castedo‐Dorado

Gómez-Vázquez

Fernandes

et al. 2012

Forest Ecology and Management

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“…Other studies have shown that understory vegetation can represent a considerable fraction of total LAI (Oren et al 1987, Loustau and Cochard 1991, Baldocchi et al 2000, Porté et al 2009) and be the main driver of the increase in whole stand ET and thus carbon exchange after regeneration or until the stand reaches canopy closure (Jarosz et al 2008. However, our comparison of methods to determine ET revealed that great care should be taken when using both soil water balance methods to estimate understory transpiration (Table 2).…”

Section: Partitioning the Effect Of Soil Evaporation Tree Transpiratmentioning

confidence: 83%

A Comparison of Three Methods to Estimate Evapotranspiration in Two Contrasting Loblolly Pine Plantations: Age-Related Changes in Water Use and Drought Sensitivity of Evapotranspiration Components

Domec¹,

Sun²,

Noormets³

et al. 2012

Forest Science

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Increasing variability of rainfall patterns requires detailed understanding of the pathways of water loss from ecosystems to optimize carbon uptake and management choices. In the current study we characterized the usability of three alternative methods of different rigor for quantifying stand-level evapotranspiration (ET), partitioned ET into tree transpiration (T), understory transpiration, interception, and soil evaporation (E S ) and determined their sensitivity to drought, and evaluated the reliability of soil moisture measurements by taking into account deep soil moisture dynamic. The analyses were conducted in an early-and in a mid-rotation stand of loblolly pine, the predominant species of southern US forest plantations. The three alternative methods for estimating ET were the eddy covariance measurements of water vapor fluxes (ET EC ), the water table fluctuation (ET WT ), and the soil moisture fluctuation (ET SM ). On annual and monthly scales, the three methods agreed to within 10 -20%, whereas on a daily scale, the values of ET SM and ET EC differed by up to 50% and ET SM and ET WT differed by up to 100%. The differences between the methods were attributed to root water extraction below measurement depth and to the sampling at different spatial scales. Regardless of the method used, ET at the early-rotation site was 15-30% lower than that at the mid-rotation site. The dry years did not affect ET at the mid-rotation site but reduced significantly ET at the early-rotation site. Soil moisture trends revealed the importance of measuring water content at several depths throughout the rooting zone because less than 20% of the water is stored in the top 30 cm of soil. Annually, E S represented approximately 9 and 14% of ET EC at the mid-rotation site and the early-rotation site, respectively. At the mid-rotation site, T accounted for approximately 70% of ET EC . Canopy interception was estimated to be 5-10% of annual precipitation and 6 -13% of total ET EC . At the early-rotation site, T accounted for only 35% of ET EC . At this site, transpiration from subdominant trees and shrubs represented 40 -45% of ET EC , indicating that understory was a significant part of the water budget. We concluded that the eddy covariance method is best for estimating ET at the fine temporal scale (i.e., daily), but other soil moisture and water table-based methods were equally reliable and cost-effective for quantifying seasonal ET dynamics. FOR. SCI. 58(5):497-512.Keywords: eddy covariance, loblolly pine, Pinus taeda, sapflow, soil moisture probes, water table L OBLOLLY PINE (PINUS TAEDA L.) REPRESENTS ONE-HALF OF THE STANDING PINE VOLUME in the southern United States (11.7 million ha) and is by far the single most commercially important forest tree species for the region, with more than 1 billion seedlings planted annually (McKeand et al. 2003). More than 1 million ha of intensively managed loblolly pine plantations are found along the lower coastal plain in eastern North Carolina. Large areas of the North Carolina...

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Using cover measurements to estimate aboveground understorey biomass in Maritime pine stands

Cited by 26 publications

References 34 publications

Carbon storage in degraded cork oak (Quercus suber) forests on flat lowlands in Morocco

Carbon storage in degraded cork oak (Quercus suber) forests on flat lowlands in Morocco

Shrub fuel characteristics estimated from overstory variables in NW Spain pine stands

A Comparison of Three Methods to Estimate Evapotranspiration in Two Contrasting Loblolly Pine Plantations: Age-Related Changes in Water Use and Drought Sensitivity of Evapotranspiration Components

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