Similarity of nutrient uptake and root dimensions of Engelmann spruce and subalpine fir at two contrasting sites in Colorado

Yanai, Ruth D.; McFarlane, K. J.; Lucash, Melissa S.; Kulpa, Sarah E.; Wood, Dustin M.

doi:10.1016/j.foreco.2009.04.035

Cited by 14 publications

(8 citation statements)

References 35 publications

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“…Thus we conclude that our in situ measurements of natural variation in soil N provide a relatively accurate index of seedling soil N environments over the duration of the treatments (2007)(2008)(2009)(2010). Lastly, growth or uptake responses to N form, or nitrate reductase activity, have been reported for some of our study species and these patterns are generally consistent with the pattern that we documented (Truax et al 1994;Rothstein et al 1996;Bauer and Berntson 2001;Miller and Hawkins 2007;Yanai et al 2009;Scott and Rothstein 2011;Tang et al 2012; but for white ash, see Scott and Rothstein 2011). Thus, we conclude that our statistical modeling of growth responses to natural variation in soil N forms provided an accurate assessment of species N-form specificity.…”

Section: Fig 5 Species Responses Tosupporting

confidence: 88%

Seedling growth responses to light and mineral N form are predicted by species ecologies and can help explain tree diversity

2014

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Tree species distributions and diversity could be explained by rank changes in performance over multiple spatiotemporal resource gradients, i.e., resource partitioning. For 14 species planted in 45 harvest gap and closed canopy locations in a mesic northern hardwood forest community, Michigan, USA, we asked the following questions: (i) are species growth responses to light, nitrogen (N), or N form (ammonium vs. nitrate) related to their ecological distributions and phylogenies? and (ii) is there evidence of growth-based resource partitioning over measured resource gradients? Growth responses to the N form were consistent with both differences in uptake energy requirements between N forms and their availability through succession and across fertility gradients; height growth was negatively related to the species shade-tolerance score, especially in high light, i.e., shade-intolerant species responded to soil nitrate-N and shade-tolerant species responded to ammonium-N; fertile soil associated species responded to nitrate-N and infertile soil associated species to ammonium-N; and gymnosperms responded to ammonium-N and angiosperm responses varied. Modeled growth responses to resources showed only modest evidence for rank changes over resource gradients, with N contributing less to rank changes than light. Thus, growth responses to resources were accurately predicted by species ecology and (or) phylogeny; however, there was only modest support for the notion that growth-based resource partitioning underlies community-scale diversity in a northern hardwood forest.Résumé : La distribution et la diversité des espèces d'arbre pourraient être expliquées par des changements de classe de performance selon de multiples gradients spatiotemporels de ressources, c'est-à -dire la répartition des ressources. Pour 14 espèces plantées à 45 endroits (trouée forestière ou couvert fermé) dans une communauté de feuillus nordiques établie sur une station mésique du Michigan, aux États-Unis, nous avons posé les questions suivantes : (i) est-ce que la réaction de croissance des espèces à la lumière, à l'azote (N) ou à la forme de N (ammonium ou nitrate) est reliée à leur distribution écologique et à leur phylogénie? et (ii) est-ce qu'il y a des signes de répartition des ressources fondée sur la croissance selon le gradient des ressources mesurées? La croissance en hauteur était négativement reliée au degré de tolérance à l'ombre des espèces, particulièrement en conditions de forte luminosité. En fonction des gradients de succession et de fertilité, la réaction de croissance à N était généralement cohérente avec la disponibilité des formes de N et des exigences énergétiques pour leur absorption : les espèces intolérantes à l'ombre réagissaient à N du sol sous forme de nitrate et les espèces tolérantes à l'ombre à N sous forme d'ammonium; les espèces associées aux stations fertiles réagissaient à N sous forme de nitrate et les espèces associées aux sols infertiles à N sous forme d'ammonium; les gymnospermes réagissaient à N sous forme d'am...

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Section: Fig 5 Species Responses Tosupporting

confidence: 88%

Seedling growth responses to light and mineral N form are predicted by species ecologies and can help explain tree diversity

2014

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“…We are not aware of a study that has explored the extent to which aspen and conifer trees directly affect soil C turnover and microbial biomass through their rhizodeposits. Higher specific root length (SRL) of aspen compared to conifers [50,51,53,92,93] suggests a higher volume of soil exploited and affected by rhizosphere processes like root exudation and detritus input [94]. This could suggest more dynamic belowground processes under aspen.…”

Section: Rooting Pattern and Rhizosphere Processesmentioning

confidence: 99%

A Tree Species Effect on Soil That Is Consistent Across the Species’ Range: The Case of Aspen and Soil Carbon in North America

Laganière

Boča

Miegroet

et al. 2017

Forests

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Trembling aspen covers a large geographic range in North America, and previous studies reported that a better understanding of its singular influence on soil properties and processes is of high relevance for global change questions. Here we investigate the potential impact of a shift in aspen abundance on soil carbon sequestration and soil carbon stability at the continental scale by conducting a systematic literature review using 23 published studies. Our review shows that aspen's effect on soil carbon is relatively consistent throughout the species range. Aspen stores less C in the forest floor but similar amounts in the mineral soil relative to conifers. However, a robust set of indicators of soil C stability, for example, degree of organo-mineral associations, proportion of readily-available or labile C estimated during long-term soil incubations or using hot-water extraction, pattern of soil C distribution, and temperature sensitivity of soil heterotrophic respiration, reveals that the soil organic carbon (SOC) stock under aspen is more stable, rendering it more protected against environmental changes and soil disturbances. Therefore, our continental-scale analysis highlights that an increase in the abundance of trembling aspen in North American forests may increase the resistance and resilience of soil C stocks against global changes.

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“…Unfortunately, this has not always been the case. For example, published estimates of specific root length (m g À1 ) in fine roots of Quercus alba vary by an order of magnitude (Comas et al, 2002;Yanai et al, 2009;McCormack et al, 2012). Among these studies and many others, the portion of the fine-root pool on which measurements are made ranges from individual root tips to small root branches or to all roots below a fixed diameter cutoff (Comas et al, 2002;Pregitzer et al, 2002;Guo et al, 2008b;Holdaway et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Redefining fine roots improves understanding of below‐ground contributions to terrestrial biosphere processes

et al. 2015

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505I.506II.506III.508IV.512V.513VI.514515References515 Summary Fine roots acquire essential soil resources and mediate biogeochemical cycling in terrestrial ecosystems. Estimates of carbon and nutrient allocation to build and maintain these structures remain uncertain because of the challenges of consistently measuring and interpreting fine‐root systems. Traditionally, fine roots have been defined as all roots ≤ 2 mm in diameter, yet it is now recognized that this approach fails to capture the diversity of form and function observed among fine‐root orders. Here, we demonstrate how order‐based and functional classification frameworks improve our understanding of dynamic root processes in ecosystems dominated by perennial plants. In these frameworks, fine roots are either separated into individual root orders or functionally defined into a shorter‐lived absorptive pool and a longer‐lived transport fine‐root pool. Using these frameworks, we estimate that fine‐root production and turnover represent 22% of terrestrial net primary production globally – a c. 30% reduction from previous estimates assuming a single fine‐root pool. Future work developing tools to rapidly differentiate functional fine‐root classes, explicit incorporation of mycorrhizal fungi into fine‐root studies, and wider adoption of a two‐pool approach to model fine roots provide opportunities to better understand below‐ground processes in the terrestrial biosphere.

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Similarity of nutrient uptake and root dimensions of Engelmann spruce and subalpine fir at two contrasting sites in Colorado

Cited by 14 publications

References 35 publications

Seedling growth responses to light and mineral N form are predicted by species ecologies and can help explain tree diversity

Seedling growth responses to light and mineral N form are predicted by species ecologies and can help explain tree diversity

A Tree Species Effect on Soil That Is Consistent Across the Species’ Range: The Case of Aspen and Soil Carbon in North America

Redefining fine roots improves understanding of below‐ground contributions to terrestrial biosphere processes

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