Photosynthetic production of ground vegetation in different-aged Scots pine (Pinus sylvestris) forests

2011 ◽  
Vol 41 (10) ◽  
pp. 2020-2030 ◽  
Author(s):  
L. Kulmala ◽  
J. Pumpanen ◽  
P. Kolari ◽  
P. Muukkonen ◽  
P. Hari ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Forest Succession ◽  
Gross Primary Production ◽  
Light Availability ◽  
Primary Objective ◽  
Stand Age ◽  
Ground Vegetation ◽  
Photosynthetic Production

The photosynthesis of ground vegetation is dependent on species composition and environmental factors that are extremely diverse during forest succession. However, present in situ measurements over the gross primary production (GPP) of ground vegetation are unable to cover this variability. The primary objective of the present study was to estimate the GPP of ground vegetation in five differently aged Scots pine (Pinus sylvestris L.) forests in southern Finland during the growing season of 2006 by using temperature, soil moisture, photosynthetically active radiation, and biomass of the ground vegetation to run a known process-based model. The GPP of ground vegetation was ~350 g·m–2 at the 6- and 12-year-old sites and 168, 146, and 41 g·m–2 thereafter at the 20-, 45-, and 120-year-old sites, respectively. The values decreased with stand age, because as the stand ages, light availability decreases, the dominant species below the canopy show lower rates of photosynthesis than species in open areas, and the biomass of the ground vegetation decreases. Grasses and herbs took up nearly half of the value at the youngest site but their role decreased thereafter, whereas low shrubs were responsible for most of the GPP of ground vegetation below closed canopies.

Does climate-related in situ variability of Scots pine (Pinus sylvestris L.) needles have a genetic basis? Evidence from common garden experiments

2019 ◽  
Vol 39 (4) ◽  
pp. 573-589 ◽  
Author(s):  
Artur Jankowski ◽  
Tomasz P Wyka ◽  
Roma Żytkowiak ◽  
Darius Danusevičius ◽  
Jacek Oleksyn
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Genetic Basis ◽  
Common Garden ◽  
Common Garden Experiments

scholarly journals No tropospheric ozone impact on the carbon uptake by a Belgian pine forest

2016 ◽  
Author(s):  
Lore Verryckt ◽  
Maarten Op de Beeck ◽  
Johan Neirynck ◽  
Bert Gielen ◽  
Marilyn Roland ◽  
...  
Keyword(s):  
Scots Pine ◽  
Tropospheric Ozone ◽  
Crop Yields ◽  
Gross Primary Production ◽  
Carbon Uptake ◽  
Tree Seedlings ◽  
Forest Trees ◽  
Negative Effects ◽  
Uptake Rates

Abstract. High stomatal ozone (O3) uptake has been shown to negatively affect crop yields and the growth of tree seedlings. However, little is known about the effect of O3 on the carbon uptake by mature forest trees. This study investigated the effect of high O3 events on gross primary production (GPP) for a Scots pine stand near Antwerp, Belgium over the period 1998–2013. Stomatal O3 fluxes were modelled using in situ O3 concentration measurements and a multiplicative stomatal model, which was parameterised and validated for this Scots pine stand. Ozone-induced GPP reduction is most likely to occur during or shortly after days with high stomatal O3 uptake. Therefore, a GPP model parameterised for days with low stomatal O3 uptake rates was used to simulate GPP during periods of high stomatal O3 uptake. Eventual negative effects of high stomatal O3 uptake on GPP would then result in an overestimation of GPP by the model during or after high stomatal O3 uptake events. The O3 effects on GPP were linked to AOT40 and PODy. Although the critical levels for both indices were exceeded in every single year, no significant negative effects were found of ozone on GPP and no correlations between GPP residuals and AOT40 and PODy were found. Overall, we conclude that no O3 effects were detected on the carbon uptake by this Scots pine stand.

scholarly journals A review of thinning effects on Scots pine stands: From growth and yield to new challenges under global change

2017 ◽  
Vol 26 (2) ◽  
pp. eR03S ◽  
Author(s):  
Miren Del Río ◽  
Andrés Bravo-Oviedo ◽  
Hans Pretzsch ◽  
Magnus Löf ◽  
Ricardo Ruiz-Peinado
Keyword(s):  
Ecosystem Services ◽  
Pinus Sylvestris ◽  
Scots Pine ◽  
Growth And Yield ◽  
Distribution Area ◽  
Stand Age ◽  
Positive Effects ◽  
Pine Stands ◽  
The Impact ◽  
Scots Pine Stands

Aim of the study: Thinning experiments in Scots pine (Pinus sylvestris L.) stands have been carried out since long in different regions of its distribution. The aim of this paper is to gather the knowledge about the thinning effects on Scots pine stands, from the effects on growth and yield to the provision of ecosystem services in the framework of climate change.Area of study: The review covered studies from different regions of the distribution area of Scots pineAim of the study: Thinning experiments in Scots pine (Pinus sylvestris L.) stands have been carried out for many years in different regions of its distribution. The aim of this paper is to gather knowledge regarding the effects of thinning on Scots pine stands, from the effects on growth and yield to the provision of ecosystem services in the context of climate change.Area of study: The review covers studies from different regions of the distribution area of Scots pineMaterial and methods: We reviewed the effect of thinning on four aspects: growth and yield, stability against snow and wind, response to drought, and ecosystem services.Main results: Heavy thinning involves a loss in volume yield, although the magnitude depends on the region, site and stand age. Thinning generally does not affect dominant height while the positive effect on tree diameter depends on the thinning regime. The stability of the stand against snow and wind is lower after the first thinning and increases in the long term. The impact of extreme droughts on tree growth is lower in thinned stands, which is linked to a better capacity to recover after the drought. Thinning generally reduces the wood quality, litter mass, and stand structural diversity, while having neutral or positive effects on other ecosystem services, although these effects can vary depending on the thinning regime. However, scarce information is available for most of the ecosystem services.Research highlight: Existing thinning experiments in Scots pine stands provided valuable information about thinning effects, but new experiments which cover a broad range of ecosystem services under different site conditions are still needed.

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