Density reduction in loblolly pine (Pinus taeda L.) stands to increase tree C assimilation: an approach with the dual δ13C and δ18O isotope signatures in needles

Bose, Arun K.; Nelson, Andrew S.; Kane, Michael B.; Rigling, Andreas

doi:10.1007/s13595-017-0687-1

Cited by 11 publications

(4 citation statements)

References 55 publications

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“…Tree growth responses to drought can depend on tree sizes (D'Amato et al 2013;Schwarz & Bauhus 2019) and stand characteristics (Bottero et al 2017;Bose et al 2018;Andrews et al 2020). For example, small Pinus nigra trees were more drought sensitive, in terms of growth, in mixed conifer stands in Spain (Martı ´n-Benito et al 2008), while large trees were more sensitive in mixed Picea abies and Fagus sylvatica stands in Germany (Pretzsch et al 2018), as well as in pure Pinus nigra stands in Spain (Lucas-Borja et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Did the 2018 megadrought change the partitioning of growth between tree sizes and species? A Swiss case‐study

et al. 2021

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By killing or weakening trees, drought could change the partitioning of growth between tree sizes or species, thereby altering stand structure. Growth partitioning, often quantified using the growth dominance coefficient (DC) or the shape of tree size versus growth relationships (SGR), indicates the relative contribution of differently sized trees to the total stand growth. Changes in growth partitioning due to droughts are rarely examined but provide valuable information that links tree‐ and stand‐level responses to droughts. The objective of this study was to test whether the 2018 European megadrought altered the growth partitioning among tree sizes and species. For this purpose, we first evaluated whether DC or SGR can be calculated from small sample sizes of trees typical of individual forest inventory plots. DC, and particularly SGR, were sensitive to sample size, forest type (even‐aged and uneven‐aged), target variable (tree diameter, basal area or stem mass) and range of tree sizes within the sample. SGR could therefore not be used for our analyses. We found no differences in DC prior to and during the 2018 drought. However, when considering only beech (Fagus sylvatica)‐dominated stands, DC was lower during post‐drought years than during the 2018 drought. The growth of larger trees, especially beech, was more negatively affected during post‐drought years. Therefore, an extreme drought event can indeed alter the growth partitioning within forest stands. The DC indicates such changes in partitioning and, hence, which trees can be selected for commercial thinning, or released from competition, to minimize potential impacts of droughts.

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Section: Introductionmentioning

confidence: 99%

Did the 2018 megadrought change the partitioning of growth between tree sizes and species? A Swiss case‐study

et al. 2021

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“…Climate observations at a global scale indicate an increased frequency and severity of drought events [1], though uncertainties remain concerning the responses of tree species to extreme droughts [2]. Tree growth responses to droughts depend on tree and stand characteristics [3][4][5]. Although several studies have investigated the potential impacts of droughts in drought-prone forests (e.g., [6][7][8]), we still need research focusing on identifying the morphological characteristics of vulnerable individuals across different species to accurately prepare and understand drought responses in forests [9].…”

Section: Introductionmentioning

confidence: 99%

Assessing Tree Drought Resistance and Climate-Growth Relationships under Different Tree Age Classes in a Pinus nigra Arn. ssp. salzmannii Forest

Lucas‐Borja

Bose

Andivia

et al. 2021

Forests

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The magnitude of drought impact in forest ecosystems depends on which group of trees are more severely affected; greater mortality of smaller trees can modulate the trajectories of succession, while the mortality of larger trees can disproportionately offset the ecosystem’s carbon balance. Several studies have documented a greater vulnerability of large trees to extreme droughts while some other studies reported a greater growth reduction in smaller trees during droughts. We tested these hypotheses by comparing tree basal area increment (BAI), drought resistance (i.e., magnitude of growth decline during drought), and resilience (i.e., magnitude of growth recovery after drought) across five different age-classes in black pine (Pinus nigra Arn. Ssp salzmannii) forests in Spain. Our results showed that the BAI patterns, drought resistance, and resilience were strongly influenced by tree age-classes. In addition, the effect of climatic water balance (precipitation minus potential evapotranspiration) on BAI significantly varied among age-classes. The effect of water balance on BAI was lower for younger age-classes (1–39 years of age) compared to older age-classes. We observed a greater growth reduction (i.e., lower resistance) in older trees (>40 years of age) during droughts compared to younger trees (<40 years of age). However, all trees, irrespective of their ages, were able to recover the growth rates after the drought. In general, younger trees showed a greater capacity in recovering the growth rate (i.e., more resilient) than older trees. We detected no significant effects of stand basal area and stand density on BAI, drought resistance, and resilience. Overall, our results indicated that growth of older trees was more negatively affected during drought. Therefore, these older/larger trees can be selected for commercial thinning, or can be released from competition, which can minimize the potential impacts of future droughts in black pine forests in Spain.

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“…Leaf stable isotope abundance of C (δ 13 C) is associated with the ratio of photosynthetic rate to stomatal conductance for water vapor (Farquhar et al 1982;Bose et al 2018), which can reveal the environment in which biomass was produced and be used to infer the intrinsic water utilization efficiency (iWUE). Generally, with rising atmospheric CO 2 concentration, plants experience a similar diffusion of CO 2 into the leaf with relatively small stomatal (Huang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen addition accelerates the nitrogen cycle in a young subtropical Cunninghamia lanceolata (Lamb.) plantation

Zhang

Zhou

et al. 2019

Annals of Forest Science

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& Key message The nitrogen (N) cycle is likely to accelerate under future climate change. Leaf δ 15 N enrichment factor is an indicator of N status in young Cunninghamia lanceolata (Lamb.) plantation ecosystems. Given that N dynamics across the plant-soil continuum respond more strongly to N addition during the dry season when N leaching is minimal, fertilization during this period represents an optimal strategy for improving soil fertility. & Context The effects of N deposition on N dynamics across the plant-soil continuum in subtropical regions are poorly understood. & Aims We investigated the effects of N addition on the N dynamics across the plant-soil continuum in young C. lanceolata plantations in different seasons as well as the effects of N addition on the soil microbial community. & Methods During the dry and wet seasons, we measured the concentrations of soil inorganic N, dissolved organic N in soil solution, leaf and root N concentrations, and stable isotope abundances, and soil microbial community characteristics. & Results Short-term N addition decreased the levels of inorganic N, dissolved organic N, and leaf N concentration in the dry season; root N concentration was significantly higher in the high N and low N addition plots. Irrespective of treatment, the NH 4 + / NO 3 − ratio was higher in the wet season than in the dry season. The δ 15 N enrichment factors of the leaf and root in our experiments were closer to zero for all N addition treatments. Redundancy analysis revealed that the variation in the soil microbial community had low correlation with pH. & Conclusion Nitrogen dynamics across the plant-soil continuum respond more strongly to N addition in the dry season. High N deposition in N-saturated subtropical forest soil may rapidly increase leaching, particularly during the wet season. Nutrients in roots are more sensitive to changes in soil nutrient availability than those in leaves. The microbial community is primarily regulated by nutrient availability in the soil rather than by pH.

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Density reduction in loblolly pine (Pinus taeda L.) stands to increase tree C assimilation: an approach with the dual δ13C and δ18O isotope signatures in needles

Cited by 11 publications

References 55 publications

Did the 2018 megadrought change the partitioning of growth between tree sizes and species? A Swiss case‐study

Did the 2018 megadrought change the partitioning of growth between tree sizes and species? A Swiss case‐study

Assessing Tree Drought Resistance and Climate-Growth Relationships under Different Tree Age Classes in a Pinus nigra Arn. ssp. salzmannii Forest

Nitrogen addition accelerates the nitrogen cycle in a young subtropical Cunninghamia lanceolata (Lamb.) plantation

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