Rarity of shortleaf, slash, and longleaf pine seedlings in oak-pine forest types: An assessment of associated environmental, stand, site, and disturbance factors

Ojha, Santosh K.; Naka, Kozma; Dimov, Luben D.; Bhatta, Dilli

doi:10.1016/j.foreco.2019.02.013

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Therefore, an adequate number of seed trees should be maintained in those stands to increase the natural regeneration of longleaf pine. An earlier study [ 15 ] found that a one-unit increase in the overstory basal area ratio of longleaf pine likely increases the odds of occurrence of their seedlings by approximately seven times in oak-pine forest type groups of the southeast US.…”

Section: Discussionmentioning

confidence: 99%

“…Longleaf pine masts every seven to ten years and a profusion of cones are necessary for successful longleaf pine regeneration [ 14 ]. A declining proportion of longleaf pine in the overstory reduces its seed availability and natural regeneration occurrence in mixed forests [ 15 ]. It is still a matter of investigation whether the distributional pattern and compositional dominance of longleaf pine changed across the longleaf pine range during the last two decades.…”

Section: Introductionmentioning

confidence: 99%

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Growth, proportion, and distribution pattern of longleaf pine across southeastern forests and disturbance types: A change assessment for the period 1997-2018

2021

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The long-term decline of longleaf pine-dominated forests has received considerable attention among land managers and conservation professionals in the last few decades. The objective of this study was to investigate the change in and the variation of the proportion, density, growth, and dominance of longleaf pine across the longleaf pine ecosystems for the 1997–2018 period. We used two sets of measurements of 1,432 plots from the Forest Inventory and Analysis (FIA) dataset covering the entire current longleaf pine range. The relationship between disturbances and longleaf pine basal area ratio and basal area growth were analyzed using linear mixed modeling. Change detection maps were produced using the Inverse Distance Weighted (IDW) interpolation method. The total basal area and aboveground biomass per hectare increased in 64% and 72%, but decreased in 30% and 28% of the study area, respectively, between the first and last inventory intervals. Species richness and diversity generally decreased across the studied plots. Longleaf pine tree density and importance value percent increased during the period. However, longleaf basal area ratio and aboveground biomass ratio in the stands decreased on average by 5% during the period, although these ratios increased in some locations in southwest Georgia and near the west coast of Florida. The longleaf pine basal area ratio and aboveground biomass ratio decreased equally in 37%, and increased in 19% and 21% of the study area, respectively. There was about 79% variation in the ratio of longleaf pine basal area among plots. When compared to the natural control of no disturbance, fire disturbance was significantly associated with greater longleaf pine basal area ratio and basal area growth. Understanding the change in growth and distribution patterns of longleaf pine across its range over time is vital to restore these critical ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Growth, proportion, and distribution pattern of longleaf pine across southeastern forests and disturbance types: A change assessment for the period 1997-2018

2021

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“…Changes in disturbance regimes have reduced the abundance of shortleaf pine across the landscape and shifted mixedwoods toward hardwood dominance (Guyette et al 2007;Ojha et al 2019). Historically, fire has been an important disturbance for maintaining shortleaf pine -oak mixtures.…”

Section: Shortleaf Pine -Oakmentioning

confidence: 99%

Mixedwood silviculture in North America: the science and art of managing for complex, multi-species temperate forests

et al. 2021

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Temperate mixedwoods (hardwood – softwood mixtures) in central and eastern U.S. and Canada can be classified into two overarching categories: those with shade-tolerant softwoods maintained by light to moderate disturbances and those with shade-intolerant to mid-tolerant softwoods maintained by moderate to severe disturbances. The former includes red spruce (Picea rubens Sarg.), balsam fir (Abies balsamea (L.) Mill.), or eastern hemlock (Tsuga canadensis (L.) Carr.) in mixture with northern hardwood species; the latter includes pine (Pinus) – oak (Quercus) mixtures. Such forests have desirable socio-economic values, wildlife habitat potential, and/or adaptive capacity, but management is challenging because one or more softwood species in each can be limited by depleted seed sources, narrow regeneration requirements, or poor competitive ability. Appropriate silvicultural systems vary among mixedwood compositions depending on shade tolerance and severity of disturbance associated with the limiting softwoods, site quality, and level of herbivory. Sustainability of mixedwood composition requires that stand structure and composition be managed at each entry to maintain vigorous trees of species with different growth rates and longevities and to encourage development of advance reproduction or seed-producing trees of desired species. Regardless of silvicultural system, maintaining seed sources of limiting softwoods, providing suitable germination substrates, and controlling competition are critical. Here, we describe commonalities among temperate mixedwoods in central and eastern North America, and present a framework for managing them.

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Occurrence, density, and distribution of longleaf pine regeneration in southeastern forests: An assessment by forest type, disturbance and site quality

Ojha

Tadesse

Oswalt

et al. 2021

Forest Ecology and Management

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Rarity of shortleaf, slash, and longleaf pine seedlings in oak-pine forest types: An assessment of associated environmental, stand, site, and disturbance factors

Cited by 5 publications

References 19 publications

Growth, proportion, and distribution pattern of longleaf pine across southeastern forests and disturbance types: A change assessment for the period 1997-2018

Growth, proportion, and distribution pattern of longleaf pine across southeastern forests and disturbance types: A change assessment for the period 1997-2018

Mixedwood silviculture in North America: the science and art of managing for complex, multi-species temperate forests

Occurrence, density, and distribution of longleaf pine regeneration in southeastern forests: An assessment by forest type, disturbance and site quality

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