Regeneration Pulses and Climate-Vegetation Interactions in Nonpyrogenic Boreal Scots Pine Stands

Zackrisson, Olle; Nilsson, Marie‐Charlotte; Steijlen, Ingeborg; Hörnberg, Greger

doi:10.2307/2261600

Cited by 143 publications

(109 citation statements)

References 63 publications

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“…A higher temperature increases evapotranspiration and lowers the groundwater table in peatlands, creating favourable conditions for colonisation by pines (Gunnarsson 2000). Zackrisson et al (1995) observed that Scots pine regeneration pulses in boreal forests lag behind the temperature increase by 20 to 30 years. They explained this lag by the great variation in seed production, quality and germination ability, as well as variation in seedling survival caused by climate variability, and by gradual changes in the understorey vegetation composition towards a more favourable one for Scots pine development (Zackrisson et al 1995).…”

Section: Scots Pine Colonization In Natural and Drained Bogs In Latviamentioning

confidence: 99%

The colonization history of Scots pine (Pinus sylvestris) in pristine and drained raised bogs in Latvia

Čugunovs

Nikodemus²,

Dauškane³

et al. 2016

EEB

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In this study, we determined the spatio-temporal patterns of Scots pine (Pinus sylvestris L.) colonization in a drained and an undrained raised bog in Latvia, in relation to climate data and drainage history. The age of trees was estimated and mapped. In the drained mire, tree groups with age 20 to 60 years covered an extensive area, and the time of colonization corresponded to a period of low precipitation and bog drainage. In the undrained mire, the age of Scots pine was mostly 30 to 50 years and the peak colonization likely occurred when the ground water level was deeper in a period of low precipitation. Thus, the evidence suggests that drainage is not the only factor driving the development of Scots pine stands in bogs in Latvia. Our results show that the impacts of other factors, such as climate, should also be considered in ecosystem restoration and management plans.

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Section: Scots Pine Colonization In Natural and Drained Bogs In Latviamentioning

confidence: 99%

The colonization history of Scots pine (Pinus sylvestris) in pristine and drained raised bogs in Latvia

Čugunovs

Nikodemus²,

Dauškane³

et al. 2016

EEB

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“…The self-perpetuating regeneration patterns of latesuccessional natural pine forests in the northern boreal zone of Sweden are less recognized Zackrisson et al, 1995). Long intervals between fires, and the natural sparseness have resulted in uneven-aged Scots pine stands.…”

mentioning

confidence: 99%

“…Nevertheless, many of the pine trees in these stands are the result of regeneration during lengthy successions between fire-disturbance events. As the canopy is sparse, the microhabitat vegetation dominated by Vaccinium-Cladina mediates tree seedling establishment Zackrisson et al, 1995,) so the forest stand structures are typically multi-aged and multi-layered.…”

mentioning

confidence: 99%

Continuity of ectomycorrhizal fungi in self‐regenerating boreal Pinus sylvestris forests studied by comparing mycobiont diversity on seedlings and mature trees

et al. 1999

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Seedlings and old trees of Scots pine in self-regenerating, old, virgin boreal forest in northern Sweden were compared in terms of the species composition of their associated ectomycorrhizal (EM) fungi. The natural regeneration of seedlings was mimicked by annual seeding for 10 yr (1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995) in intact field vegetation at three sites. In 1995, all seedlings were harvested, and 171 were examined for mycorrhizas. Twenty-five soil cores were taken in order to study the mycorrhizas on the established trees. Most short roots were mycorrhizal. Using mycorrhizal morphology and restriction fragment length polymorphisms (RFLP) analysis, we were able to distinguish 43 ectomycorrhizal taxa. Fourteen of these taxa were identified using a sporocarp and mycelial culture based internal transcribed spacer (ITS)-RFLP reference database, and another three were identified by mycorrhizal morphology. Cenococcum geophilum, Piloderma croceum and Suillus variegatus were present on the seedlings, irrespective of age, as well as on the old trees. At one forest, 23 ectomycorrhizal taxa were found as mycorrhizas, of which 10 occurred on both seedlings and old trees. These 10 species accounted for 92 and 73% of the mycorrhizas on the seedlings and old trees, respectively. A 3-yr survey of ectomycorrhizal sporocarps at the same site revealed 62 EM taxa. The degree of similarity between the composition of EM species reflected by sporocarps and by mycorrhizas, was low. Ectomycorrhizal species present in our ITS-RFLP database constituted 7.5-19% of the mycorrhizas on seedlings and old trees, whereas they constituted 80-95% of the total production of epigeous sporocarps. The unidentified taxa comprised 70-87% of the mycorrhizas. Our findings support the view that the species composition of mycorrhizas colonizing naturally regenerated seedlings in forests is similar to that of mycorrhizas colonizing surrounding trees. We suggest that the concept of the mycelial network be expanded in order to embrace both the significance of interconnections between different trees as well as the continuity or perpetuation of EM fungal communities.

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“…This could explain the coherence or close succession of dying-off and germination phases. Zackrisson et al (1995) also take seed production into account to explain rejuvenation pulses in pine populations. Conditions stressful to the trees can enhance seed production.…”

Section: Rejuvenation Pulses and Suppressionmentioning

confidence: 99%

Dendrochronologically dated pine stumps document phase-wise bog expansion at a northwest German site between ca. 6700 and ca. 3400 BC

Achterberg¹,

Eckstein²,

Birkholz³

et al. 2018

Clim. Past

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Abstract. The investigated northwest German mire site at "Totes Moor" is densely covered with subfossil pine stumps (Pinus sylvestris L.) from the fen-bog transition. This facilitates the spatio-temporal reconstruction of mire development, which is based on 212 in situ tree stumps in the case study presented here. Six dendrochronologically dated site chronologies together cover 2345 years between 6703 and 3403 BC. The gaps in between are 6 to 550 years long. Additionally, a floating chronology of 309 years, containing 30 trees, was radiocarbon-dated to the beginning of the 7th millennium cal BC. Peat-stratigraphical survey was carried out additionally, and elevations a.s.l. were determined at several locations.Tree dying-off phases, which indicate water level rise at the site, mostly in context of the local fen-bog transition, are evident for ca. 6600-6450, ca. 6350-5750, ca. 5300-4900, ca. 4700-4550, ca. 3900-3850, ca. 3700-3600, ca. 3500-3450 and ca. 3400 BC. The spatial distribution of the dated in situ trees illustrates the phase-wise expansion of raised bog over fen peat at the site. The documented bog expansion pulses likely correspond to climatic wet sifts.

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Regeneration Pulses and Climate-Vegetation Interactions in Nonpyrogenic Boreal Scots Pine Stands

Cited by 143 publications

References 63 publications

The colonization history of Scots pine (Pinus sylvestris) in pristine and drained raised bogs in Latvia

The colonization history of Scots pine (Pinus sylvestris) in pristine and drained raised bogs in Latvia

Continuity of ectomycorrhizal fungi in self‐regenerating boreal Pinus sylvestris forests studied by comparing mycobiont diversity on seedlings and mature trees

Dendrochronologically dated pine stumps document phase-wise bog expansion at a northwest German site between ca. 6700 and ca. 3400 BC

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