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  1. Article ; Online: Corrigendum to: Using δ13C and δ18O to analyze loblolly pine (Pinus taeda L.) response to experimental drought and fertilization.

    Lin, Wen / Domec, Jean-Christophe / Ward, Eric J / Marshall, John / King, John S / Laviner, Marshall A / Fox, Thomas R / West, Jason B / Sun, Ge / McNulty, Steve / Noormets, Asko

    Tree physiology

    2021  Volume 42, Issue 4, Page(s) 703

    Language English
    Publishing date 2021-12-21
    Publishing country Canada
    Document type Published Erratum
    ZDB-ID 743341-4
    ISSN 1758-4469 ; 0829-318X
    ISSN (online) 1758-4469
    ISSN 0829-318X
    DOI 10.1093/treephys/tpab162
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Spatial variability in tree-ring carbon isotope discrimination in response to local drought across the entire loblolly pine natural range.

    Lin, Wen / Noormets, Asko / King, John S / Marshall, John / Akers, Madison / Cucinella, Josh / Fox, Thomas R / Laviner, Marshall A / Martin, Timothy A / Mcnulty, Steve / Meek, Cassandra / Samuelson, Lisa / Sun, Ge / Vogel, Jason / Will, Rodney E / Domec, Jean-Christophe

    Tree physiology

    2021  Volume 42, Issue 1, Page(s) 44–58

    Abstract: Considering the temporal responses of carbon isotope discrimination (Δ13C) to local water availability in the spatial analysis of Δ13C is essential for evaluating the contribution of environmental and genetic facets of plant Δ13C. Using tree-ring Δ13C ... ...

    Abstract Considering the temporal responses of carbon isotope discrimination (Δ13C) to local water availability in the spatial analysis of Δ13C is essential for evaluating the contribution of environmental and genetic facets of plant Δ13C. Using tree-ring Δ13C from years with contrasting water availability at 76 locations across the natural range of loblolly pine, we decomposed site-level Δ13C signals to maximum Δ13C in well-watered conditions (Δ13Cmax) and isotopic drought sensitivity (m) as a change in Δ13C per unit change of Palmer's Drought Severity Index (PDSI). Site water status, especially the tree lifetime average PDSI, was the primary factor affecting Δ13Cmax. The strong spatial correlation exhibited by m was related to both genetic and environmental factors. The long-term average water availability during the period relevant to trees as indicated by lifetime average PDSI correlated with Δ13Cmax, suggesting acclimation in tree gas-exchange traits, independent of incident water availability. The positive correlation between lifetime average PDSI and m indicated that loblolly pines were more sensitive to drought at mesic than xeric sites. The m was found to relate to a plant's stomatal control and may be employed as a genetic indicator of efficient water use strategies. Partitioning Δ13C to Δ13Cmax and m provided a new angle for understanding sources of variation in plant Δ13C, with several fundamental and applied implications.
    MeSH term(s) Carbon Isotopes/analysis ; Droughts ; Pinus taeda ; Trees/physiology ; Water/physiology
    Chemical Substances Carbon Isotopes ; Water (059QF0KO0R)
    Language English
    Publishing date 2021-10-06
    Publishing country Canada
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 743341-4
    ISSN 1758-4469 ; 0829-318X
    ISSN (online) 1758-4469
    ISSN 0829-318X
    DOI 10.1093/treephys/tpab097
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Using δ13C and δ18O to analyze loblolly pine (Pinus taeda L.) response to experimental drought and fertilization.

    Lin, Wen / Domec, Jean-Christophe / Ward, Eric J / Marshall, John / King, John S / Laviner, Marshall A / Fox, Thomas R / West, Jason B / Sun, Ge / McNulty, Steve / Noormets, Asko

    Tree physiology

    2019  Volume 39, Issue 12, Page(s) 1984–1994

    Abstract: Drought frequency and intensity are projected to increase throughout the southeastern USA, the natural range of loblolly pine (Pinus taeda L.), and are expected to have major ecological and economic implications. We analyzed the carbon and oxygen ... ...

    Abstract Drought frequency and intensity are projected to increase throughout the southeastern USA, the natural range of loblolly pine (Pinus taeda L.), and are expected to have major ecological and economic implications. We analyzed the carbon and oxygen isotopic compositions in tree ring cellulose of loblolly pine in a factorial drought (~30% throughfall reduction) and fertilization experiment, supplemented with trunk sap flow, allometry and microclimate data. We then simulated leaf temperature and applied a multi-dimensional sensitivity analysis to interpret the changes in the oxygen isotope data. This analysis found that the observed changes in tree ring cellulose could only be accounted for by inferring a change in the isotopic composition of the source water, indicating that the drought treatment increased the uptake of stored moisture from earlier precipitation events. The drought treatment also increased intrinsic water-use efficiency, but had no effect on growth, indicating that photosynthesis remained relatively unaffected despite 19% decrease in canopy conductance. In contrast, fertilization increased growth, but had no effect on the isotopic composition of tree ring cellulose, indicating that the fertilizer gains in biomass were attributable to greater leaf area and not to changes in leaf-level gas exchange. The multi-dimensional sensitivity analysis explored model behavior under different scenarios, highlighting the importance of explicit consideration of leaf temperature in the oxygen isotope discrimination (Δ18Oc) simulation and is expected to expand the inference space of the Δ18Oc models for plant ecophysiological studies.
    MeSH term(s) Droughts ; Oxygen Isotopes ; Photosynthesis ; Pinus ; Pinus taeda ; Plant Leaves ; Trees
    Chemical Substances Oxygen Isotopes
    Language English
    Publishing date 2019-11-16
    Publishing country Canada
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 743341-4
    ISSN 1758-4469 ; 0829-318X
    ISSN (online) 1758-4469
    ISSN 0829-318X
    DOI 10.1093/treephys/tpz096
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Regional Assessment of Carbon Pool Response to Intensive Silvicultural Practices in Loblolly Pine Plantations

    Vogel, Jason G. / Bracho, Rosvel / Akers, Madison / Amateis, Ralph / Bacon, Allan / Burkhart, Harold E. / Gonzalez-Benecke, Carlos A. / Grunwald, Sabine / Jokela, Eric J. / Kane, Michael B. / Laviner, Marshall A. / Markewitz, Daniel / Martin, Timothy A. / Meek, Cassandra / Ross, Christopher Wade / Will, Rodney E. / Fox, Thomas R.

    Forests. 2021 Dec. 30, v. 13, no. 1

    2021  

    Abstract: Tree plantations represent an important component of the global carbon (C) cycle and are expected to increase in prevalence during the 21st century. We examined how silvicultural approaches that optimize economic returns in loblolly pine (Pinus taeda L.) ...

    Abstract Tree plantations represent an important component of the global carbon (C) cycle and are expected to increase in prevalence during the 21st century. We examined how silvicultural approaches that optimize economic returns in loblolly pine (Pinus taeda L.) plantations affected the accumulation of C in pools of vegetation, detritus, and mineral soil up to 100 cm across the loblolly pine’s natural range in the southeastern United States. Comparisons of silvicultural treatments included competing vegetation or ‘weed’ control, fertilization, thinning, and varying intensities of silvicultural treatment for 106 experimental plantations and 322 plots. The average age of the sampled plantations was 17 years, and the C stored in vegetation (pine and understory) averaged 82.1 ± 3.0 (±std. error) Mg C ha⁻¹, and 14.3 ± 0.6 Mg C ha⁻¹ in detrital pools (soil organic layers, coarse-woody debris, and soil detritus). Mineral soil C (0–100 cm) averaged 79.8 ± 4.6 Mg C ha⁻¹ across sites. For management effects, thinning reduced vegetation by 35.5 ± 1.2 Mg C ha⁻¹ for all treatment combinations. Weed control and fertilization increased vegetation between 2.3 and 5.7 Mg C ha⁻¹ across treatment combinations, with high intensity silvicultural applications producing greater vegetation C than low intensity (increase of 21.4 ± 1.7 Mg C ha⁻¹). Detrital C pools were negatively affected by thinning where either fertilization or weed control were also applied, and were increased with management intensity. Mineral soil C did not respond to any silvicultural treatments. From these data, we constructed regression models that summarized the C accumulation in detritus and detritus + vegetation in response to independent variables commonly monitored by plantation managers (site index (SI), trees per hectare (TPH) and plantation age (AGE)). The C stored in detritus and vegetation increased on average with AGE and both models included SI and TPH. The detritus model explained less variance (adj. R² = 0.29) than the detritus + vegetation model (adj. R² = 0.87). A general recommendation for managers looking to maximize C storage would be to maintain a high TPH and increase SI, with SI manipulation having a greater relative effect. From the model, we predict that a plantation managed to achieve the average upper third SI (26.8) within our observations, and planted at 1500 TPH, could accumulate ~85 Mg C ha⁻¹ by 12 years of age in detritus and vegetation, an amount greater than the region’s average mineral soil C pool. Notably, SI can be increased using both genetic and silviculture technologies.
    Keywords Pinus taeda ; carbon ; carbon sinks ; detritus ; mineral soils ; models ; site index ; understory ; variance ; weed control
    Language English
    Dates of publication 2021-1230
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2527081-3
    ISSN 1999-4907
    ISSN 1999-4907
    DOI 10.3390/f13010036
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Carbon accumulation in loblolly pine plantations is increased by fertilization across a soil moisture availability gradient

    Bracho, Rosvel / Akers, Madison K / Cucinella, Joshua / Fox, Thomas R / Gezan, Salvador A / Gonzalez-Benecke, Carlos A / Jokela, Eric J / Kane, Michael B / Laviner, Marshall A / Lin, Wen / Markewitz, Daniel / Martin, Timothy A / McElligot, Kristin M / Meek, Cassandra R / Noormets, Asko / Samuelson, Lisa J / Seiler, John R / Strahm, Brian D / Teskey, Robert O /
    Vogel, Jason G / Will, Rodney E / Yang, Jinyan

    Forest ecology and management. 2018 Sept. 15, v. 424

    2018  

    Abstract: Silvicultural practices, particularly fertilization, may counteract or accentuate the effects of climate change on carbon cycling in planted pine ecosystems, but few studies have empirically assessed the potential effects. In the southeastern United ... ...

    Abstract Silvicultural practices, particularly fertilization, may counteract or accentuate the effects of climate change on carbon cycling in planted pine ecosystems, but few studies have empirically assessed the potential effects. In the southeastern United States, we established a factorial throughfall reduction (D) × fertilization (F) experiment in 2012 in four loblolly pine (Pinus taeda L.) plantations encompassing the climatic range of the species in Florida (FL), Georgia (GA), Oklahoma (OK), and Virginia (VA). Net primary productivity (NPP) was estimated from tree inventories for four consecutive years, and net ecosystem productivity (NEP) as NPP minus heterotrophic respiration (RH). Soil respiration (RS) was measured biweekly-monthly for at least one year at each site and simultaneous measurements of RS & RH were taken five to eight times through the year for at least one year during the experiment. Reducing throughfall by 30% decreased available soil water at the surface and for the 0–90 cm soil profile. Fertilization increased NPP at all sites and D decreased NPP (to a lesser extent) at the GA and OK sites. The F + D treatment did not affect NPP. Mean annual NPP under F ranged from 10.01 ± 0.21 MgC·ha−1·yr−1 at VA (mean ± SE) to 17.20 ± 0.50 MgC·ha−1·yr−1 at FL, while the lowest levels were under the D treatment, ranging from 8.63 ± 0.21 MgC·ha−1·yr−1 at VA to 14.97 ± 0.50 MgC·ha−1·yr−1 at FL. RS and RH were, in general, decreased by F and D with differential responses among sites, leading to NEP increases under F. Throughfall reduction increased NEP at FL and VA due to a negative effect on RH and no effect on NPP. Mean annual NEP ranged from 1.63 ± 0.59 MgC·ha−1·yr−1 in the control at OK to 8.18 ± 0.82 MgC·ha−1·yr−1 under F + D at GA. These results suggest that fertilization will increase NEP under a wide range of climatic conditions including reduced precipitation, but either NPP or RH could be the primary driver because F can increase stand growth, as well as suppress RS and RH. Moreover, D and F never significantly interacted for an annual C flux, potentially simplifying estimates of how fertilization and drought will affect C cycling in these ecosystems.
    Keywords carbon ; carbon cycle ; climate change ; climatic factors ; drought ; ecosystems ; inventories ; net ecosystem production ; Pinus taeda ; plant available water ; plantations ; primary productivity ; silvicultural practices ; soil profiles ; soil respiration ; throughfall ; trees ; Florida ; Georgia ; Oklahoma ; Virginia
    Language English
    Dates of publication 2018-0915
    Size p. 39-52.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2018.04.029
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  6. Article: A Range-Wide Experiment to Investigate Nutrient and Soil Moisture Interactions in Loblolly Pine Plantations

    Will, Rodney E / Akers, Madison / Domec, Jean-Christophe / Fox, Thomas / González-Benecke, Carlos / Jokela, Eric J / Kane, Michael / Laviner, Marshall A / Lokuta, Geoffrey / Markewitz, Daniel / Martin, Timothy A / McGuire, Mary Anne / Meek, Cassandra / Noormets, Asko / Samuelson, Lisa / Seiler, John / Strahm, Brian / Teskey, Robert / Vogel, Jason /
    Ward, Eric / West, Jason / Wilson, Duncan

    Forests. 2015 June 03, v. 6, no. 6

    2015  

    Abstract: The future climate of the southeastern USA is predicted to be warmer, drier and more variable in rainfall, which may increase drought frequency and intensity. Loblolly pine (Pinus taeda) is the most important commercial tree species in the world and is ... ...

    Abstract The future climate of the southeastern USA is predicted to be warmer, drier and more variable in rainfall, which may increase drought frequency and intensity. Loblolly pine (Pinus taeda) is the most important commercial tree species in the world and is planted on ~11 million ha within its native range in the southeastern USA. A regional study was installed to evaluate effects of decreased rainfall and nutrient additions on loblolly pine plantation productivity and physiology. Four locations were established to capture the range-wide variability of soil and climate. Treatments were initiated in 2012 and consisted of a factorial combination of throughfall reduction (approximate 30% reduction) and fertilization (complete suite of nutrients). Tree and stand growth were measured at each site. Results after two growing seasons indicate a positive but variable response of fertilization on stand volume increment at all four sites and a negative effect of throughfall reduction at two sites. Data will be used to produce robust process model parameterizations useful for simulating loblolly pine growth and function under future, novel climate and management scenarios. The resulting improved models will provide support for developing management strategies to increase pine plantation productivity and carbon sequestration under a changing climate.
    Keywords carbon sequestration ; climate ; climate change ; drought ; growing season ; models ; nutrients ; physiology ; Pinus taeda ; plantations ; rain ; soil water ; throughfall ; trees ; Southeastern United States
    Language English
    Dates of publication 2015-0603
    Size p. 2014-2028.
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2527081-3
    ISSN 1999-4907
    ISSN 1999-4907
    DOI 10.3390/f6062014
    Database NAL-Catalogue (AGRICOLA)

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