Initial evidence for simultaneous, bi-directional sap flow in roots of interconnected aspen ramets (Populus tremuloides)

Bretfeld, Mario; Franklin, Scott B.; Hubbard, Robert M.

doi:10.1007/s12224-017-9285-0

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…This is likely driven by greater competition for light, nutrients, and water resources (McAuliffe, 1984) with light likely being the dominant factor due to the shading effects of the evergreen conifers (Calder et al, 2011). Despite aspen being a clonal species with the potential for resource sharing among interconnected roots (Bretfeld et al, 2017), it did not appear to mitigate growth reductions for aspen trees with conifers established next to them (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

Facilitation differentially affects competitive responses of aspen and subalpine fir through stages of stand development

et al. 2022

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Spatial interactions between trees influence forest community succession. The objective of this study was to investigate how shifts in forest composition and proximity between tree species affect stand development over time in mixed forest systems. At six locations across the Fishlake National Forest, Utah, USA, in stands where facilitation has been documented previously, tree‐ring samples were collected from aspen and subalpine fir trees. Basal area increment was calculated to characterize the effects of the proximity of overstory trees on multidecadal growth responses of aspen and subalpine fir in aspen‐dominant and mixed aspen–conifer stands. Subalpine fir seedlings were established next to aspen (within 10 cm) when aspen was between 15 and 120 years old with a mean age of 60 years. Aspen and subalpine fir growth rates were reduced with increasing conifer abundance. Aspen trees growing next to a proximate subalpine fir tree had slower growth rates over time than aspen trees growing independently. Growth rates of subalpine fir in aspen‐dominated stands were similar when growing independently or near aspen trees. However, subalpine fir in conifer‐dominated stands maintained higher growth rates when growing next to an aspen tree than when growing independently. The data suggest that as stand competition increases with conifer abundance, the proximity of overstory trees increases competitive exclusion of aspen while having a beneficial growth effect on subalpine fir. These results underscore the importance of maintaining natural fire regimes in forest systems that keep competitive interactions in balance.

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Section: Discussionmentioning

confidence: 99%

Facilitation differentially affects competitive responses of aspen and subalpine fir through stages of stand development

et al. 2022

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“…They contribute to the further understanding of the core process that makes clonal plants successful in heterogeneous environments, specifically the importance of resource sharing via connections between ramets. Included here are papers describing the role of clonal integration in plant performance under different conditions (Portela and Roiloa 2017;Wan et al 2017;Wang et al 2017), benefits of ramet connections in response to nutrient availability (Duchoslavová and Weiser 2017), with a welcome addition of one of the few studies on nutrient sharing in a clonal tree (Bretfeld et al 2017). Also in this issue are three studies done at the population level, which has been rarely explored in studies on clonal plants.…”

Section: Clonality At the Level Of Individuals And Populationsmentioning

confidence: 99%

Introduction to special issue on the ecology of clonal plants

2017

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“…Isohydric species, such as P. tremuloides and P. grandidentata regulate their response to moisture deficit by closing their stomata, while anisohydric species, like Q. rubrum, maintain transpiration levels throughout the drought (Abrams, 1990;Galvez et al, 2011). The clonal aspect of interconnected root systems in Populus species could also influence how P. grandidentata and P. tremuloides respond to the drought as connected root systems have been shown to reduce the negative impacts of drought stress through the sharing of resources (Kokouvi Emmanuel et al, 2016;Bretfeld et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Aspen-dominated forest response to drought in the Lake States

Schwager¹

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The Long Term Soil Productivity (LTSP) program was founded to examine the effects of soil disturbance, specifically impacts to soil organic matter and soil compaction, on fundamental forest productivity. This project takes place on the LTSP installation in the northern lower peninsula of Michigan, on the Huron National Forest which has a primary composition of aspenbirch forest type that was clear-cut harvested and treated according to LTSP principles in early 1994. This project examines the stand-scale and individual tree scale response of this forest to a region-wide drought that occurred in 2012. The ecological indices of resistance, resilience, and recovery and tree cores collected from the site in 2018 were used to evaluate drought responses.Our work showed that there were no stand-scale growth responses to the 2012 drought associated with treatments, but species responses varied. At the individual tree scale, model selection showed that size, species, the interaction between size and species, and the interaction between crowding and species were better indicators of drought resistance and recovery to drought than treatments and their interaction, and drought resilience was best modeled by size, species, crowding, the interaction between size and species, and the interaction between crowding and species.

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Initial evidence for simultaneous, bi-directional sap flow in roots of interconnected aspen ramets (Populus tremuloides)

Cited by 9 publications

References 40 publications

Facilitation differentially affects competitive responses of aspen and subalpine fir through stages of stand development

Facilitation differentially affects competitive responses of aspen and subalpine fir through stages of stand development

Introduction to special issue on the ecology of clonal plants

Aspen-dominated forest response to drought in the Lake States

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