Two-year throughfall and fertilization effects on leaf physiology and growth of loblolly pine in the Georgia Piedmont

Samuelson, Lisa J.; Pell, Charles J.; Stokes, Tom; Bartkowiak, Stan M.; Akers, Madison; Kane, Michael B.; Markewitz, Daniel; McGuire, Mary Anne; Teskey, Robert O.

doi:10.1016/j.foreco.2014.06.030

Cited by 33 publications

(41 citation statements)

References 34 publications

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“…Compared to throughfall reduction experiments on planted pine, both predawn and midday Ψ L of the TE treated trees were more negative in our study than reported in previous research [37,38]. Mean predawn Ψ L of the TE trees in our study reached levels more negative than those previously reported for planted loblolly pine during natural drought [34][35][36] but midday Ψ L did not quite reach midday values previously reported [36,52].…”

Section: Discussioncontrasting

confidence: 85%

“…However, research on the effects of drought on loblolly pine has focused on seedlings [15,[31][32][33], short-term natural drought [34][35][36], or induced moderate drought [37][38][39][40][41]. During short-term, natural drought or induced, moderate drought (removal of 30% of throughfall), loblolly pine typically exhibit more negative water potentials and respond by reducing stomatal conductance to avoid water loss [15,38,42]. We currently lack an understanding of how sustained, more severe droughts will impact the physiology and productivity of loblolly pine.…”

Section: Introductionmentioning

confidence: 99%

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Response of Mid-Rotation Loblolly Pine (Pinus taeda L.) Physiology and Productivity to Sustained, Moderate Drought on the Western Edge of the Range

Maggard

Will

Wilson

et al. 2016

Forests

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Abstract:The productivity of the approximately 11 million ha of loblolly pine plantations in the southeastern USA could be threatened by decreased water availability in a future climate. To determine the effects of sustained drought on leaf gas exchange, whole-tree water use, and individual tree growth, we examined the response of loblolly pine trees to 100% throughfall exclusion cumulatively spanning the sixth and seventh growing seasons of a plantation in southeastern Oklahoma. Throughfall exclusion reduced volumetric soil water content for 0-12 cm soil depth from 10.8% to 4.8% and for 12-45 cm soil depth from 24.2% to 15.6%. Compared to ambient throughfall trees, leaf water potential of the throughfall exclusion trees became more negative, −0.9 MPa vs. −1.3 MPa for predawn measurements and −1.5 MPa vs. −1.9 MPa for midday measurements. Throughfall exclusion did not significantly reduce leaf gas exchange or tree water use. However, throughfall exclusion significantly reduced leaf biomass by 21% and stem volume growth by 23%. These results indicate that sustained drought may cause downward shifts in leaf quantity to conserve water rather than reducing leaf-level water use.

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Section: Discussioncontrasting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Response of Mid-Rotation Loblolly Pine (Pinus taeda L.) Physiology and Productivity to Sustained, Moderate Drought on the Western Edge of the Range

Maggard

Will

Wilson

et al. 2016

Forests

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show abstract

“…Water stress has been found to result in a decrease in net photosynthesis in loblolly pine [61], which is accompanied by a decrease in transpiration rate [62]. Seiler and Johnson [63] found evidence that water stress conditioning allowed loblolly pine seedlings to photosynthesize at lower water potentials than usual.…”

Section: Discussionmentioning

confidence: 99%

Simulated Summer Rainfall Variability Effects on Loblolly Pine (Pinus taeda) Seedling Physiology and Susceptibility to Root-Infecting Ophiostomatoid Fungi

Chieppa

Eckhardt

Chappelka

2017

Forests

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Abstract:Seedlings from four families of loblolly pine (Pinus taeda L.) were grown in capped open-top chambers and exposed to three different weekly moisture regimes for 13 weeks. Moisture regimes varied in intensity and frequency of simulated rainfall (irrigation) events; however, the total amounts were comparable. These simulated treatments were chosen to simulate expected changes in rainfall variability associated with climate change. Seedlings were inoculated with two root-infecting ophiostomatoid fungi associated with Southern Pine Decline. We found susceptibility of loblolly pine was not affected by water stress; however, one family that was most sensitive to inoculation was also most sensitive to changes in moisture availability. Many studies have examined the effects of drought (well-watered vs. dry conditions) on pine physiology and host-pathogen interactions but little is known about variability in moisture supply. This study aimed to elucidate the effects of variability in water availability, pathogen inoculation and their interaction on physiology of loblolly pine seedlings.

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“…However, in 4-year-old trees, the values observed in this study were almost twice as high as those reported in the previous study. Also in Georgia, Samuelson et al (2014) obtained lower values in the treatments with the best results in that study (with fertilization and without exclusion of rainwater). Minor differences were observed in comparison with previous experiments performed in Brazil (Valeri, 1988).…”

Section: Discussionmentioning

confidence: 62%

“…Aside from the climatic differences, it is important to consider that differences between the cited studies are probably also associated to the properties of each forest site, e.g., the low content of clay in the soil used by Adegbidi et al (2002) and of organic matter in the study of Samuelson et al (2014).…”

Section: Discussionmentioning

confidence: 99%

Tree Growth and Nutrient Dynamics in Pine Plantations in Southern Brazil

Filho

Schumacher

Neves

et al. 2017

Rev. Bras. Ciênc. Solo

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For the development of nutrient budget models to recommend lime and fertilizers for agricultural and forestry crops, curves of plant growth and nutrient accumulation are required. Information about how nutrients are partitioned between the different plant organs is also necessary, but still scarce for pine in Brazil. This study evaluated the growth, biomass partitioning, and nutrient dynamics in pine forests in southern Brazil. To this end, we assessed unthinned 2, 4, 6, and 8-year-old stands of Pinus taeda L. Three plots of 20 × 30 m per stand were delimited, in which three trees of different classes of diameter at breast height (DBH) were chosen. These trees were measured, felled, and the weight of their fresh components (leaves, branches, bark, and wood) was evaluated. Samples of each tree compartment and from the forest litter were taken to determine dry weight and nutrient content. From trees of the mean DBH class, the roots were also collected and the dry weight and nutrient contents determined. The same sampling procedure was carried out with soil for physical and chemical characterization. Regression models were adjusted to estimate growth, nutrient uptake, and nutrient use efficiency of pine trees, based on data collected in this and previous studies. The equations developed in this research can be used in nutrient budget models as well as in other simulation models, to establish recommendations of lime and fertilizers for Pinus taeda stands in southern Brazil.

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Two-year throughfall and fertilization effects on leaf physiology and growth of loblolly pine in the Georgia Piedmont

Cited by 33 publications

References 34 publications

Response of Mid-Rotation Loblolly Pine (Pinus taeda L.) Physiology and Productivity to Sustained, Moderate Drought on the Western Edge of the Range

Response of Mid-Rotation Loblolly Pine (Pinus taeda L.) Physiology and Productivity to Sustained, Moderate Drought on the Western Edge of the Range

Simulated Summer Rainfall Variability Effects on Loblolly Pine (Pinus taeda) Seedling Physiology and Susceptibility to Root-Infecting Ophiostomatoid Fungi

Tree Growth and Nutrient Dynamics in Pine Plantations in Southern Brazil

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