Effects of Adult Tree Density and Fire on the Demography of Pregrass Stage Juvenile Longleaf Pine (Pinus Palustris Mill.)

Grace, Susan L.; Platt, William

doi:10.2307/2261152

Cited by 97 publications

(83 citation statements)

References 24 publications

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“…Several studies support our observations that seedling survival is not influenced by overstory density in the absence of prescribed fire (Boyer, 1993;Palik et al, 1997;McGuire et al, 2001). However, higher litter accumulation occurs in denser stands, and it results in fires of higher intensity, and thus, higher mortality rates among understory seedlings occurring within these plots during fire (Boyer, 1963; Platt et al, 1988;Grace & Platt, 1995;Brockway & Outcalt 1998). Our findings during dormant-season prescribed fire substantiate this expectation as well.…”

Section: Seedling Survival and Growthsupporting

confidence: 89%

Effects of basal area on survival and growth of longleaf pine when practicing selection silviculture

2017

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Aim of study: Uneven-aged (UEA) management systems can achieve multiple-use objectives, however, use of UEA techniques to manage longleaf pine (Pinus palustris Mill.) forests are still open to question, because of the species' intolerance of competition. It was our aim to examine the influence of different levels (9.2, 13.8 and 18.4 m 2 ha -1 ) of residual basal area (RBA) on longleaf pine seedling survival and growth following three growing seasons.Area of study: This study was conducted at the Escambia Experimental Forest, located on the Southern Coastal Plain of Alabama, in the southeastern United States.Material and Methods: Selection silviculture was implemented with the Proportional-Basal Area (Pro-B) method. Prescribed burning was conducted before seed dispersal and in the second year after germination. Photosynthetically active radiation (PAR) was measured under the canopy in the study plots. Survival and growth of longleaf pine seedlings were observed for three growing seasons.Main results: An inverse relationship was found between the number of germinants and RBA, but the mortality of germinants and planted seedlings was not affected by RBA. At age three, an inverse relationship was observed between root-collar diameter (RCD) growth of the germinants and RBA, but RCD growth of planted seedlings was not affected by RBA. Most of the study plots contained more than the projected number of seedlings needed to sustain the target diameter structure.Research highlights: Long-term continuous monitoring of seedling development and recruitment into canopy is required to determine the efficacy of UEA management. However, current data suggest that UEA methods may be a viable alternative to the use of even-aged (EA) methods in longleaf ecosystems.

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Section: Seedling Survival and Growthsupporting

confidence: 89%

Effects of basal area on survival and growth of longleaf pine when practicing selection silviculture

2017

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“…These tests were used to examine Wre and livestock grazing eVects on survivorship, collective basal cover, and clone basal area for three size classes of B. eriopoda clones: small (0-10 cm 2 basal area), medium (10-30 cm 2 ), and large ( >30 cm 2 ) a F, Fire; N, no Wre; S, small clones; M, medium clones; L, large clones southeastern longleaf pine savannas (Grace and Platt 1995;Mulligan and Kirkman 2002) and savannas and shrublands of Belize (Miyanishi and Kellman 1986) and Australia (Radford et al 2001;Vesk et al 2004). Perennial grass clones of smaller size classes may be more susceptible to complete kill after Wre because their root systems are less developed than larger clones and thus they lack the necessary resources for resprouting (Grace and Platt 1995). In all of these Wre-prone ecosystems, including Chihuahuan Desert grasslands, Wre at these temperatures and followed by rain does not kill all clones, regardless of size, thus further emphasizing the non-catastrophic nature of such Wres on perennial grass responses.…”

Section: Discussionmentioning

confidence: 99%

Population and clonal level responses of a perennial grass following fire in the northern Chihuahuan Desert

2006

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Relationships involving fire and perennial grasses are controversial in Chihuahuan Desert grasslands of southern New Mexico, USA. Research suggests that fire delays the resprouting of perennial grasses well after two growing seasons. However, such results are confounded by livestock grazing, soil erosion, and drought. Additionally, post-fire grass responses may depend on initial clone size. We evaluated the effects of fire, grazing, and clone size on Bouteloua eriopoda (black grama) in southern New Mexico grasslands. Four 2-ha plots were established in each of four sites. Fire and grazing were applied or not applied in 1999 such that four treatment combinations were assigned randomly to plots within each site. Within each plot, small (0-10 cm(2) basal area), medium (10-30 cm(2)), and large ( > 30 cm(2)) clones were initially mapped in five 0.91-m(2) quadrats where grass attributes and litter cover were evaluated before and at the end of two growing seasons following fire. Maximum fire temperature was also measured. At a population level, canopy and litter cover were each approximately 50% less in burned than unburned areas. However, compared to initial levels, canopy height had increased by 10% at the end of the study, regardless of fire. At a clonal level, basal cover reductions were attributed mostly to large clones that survived fire. Smaller clone densities had decreased by as much as 19% in burned compared to unburned areas, and fire reduced the basal cover of medium clones. Basal and canopy cover, recruitment, and clone basal area decreased with increased fire temperatures. Almost all responses were independent of grazing, and interactive effects of grazing and fire were not detected. Fire did not kill all perennial grass clones, regardless of size. However, rapid responses were likely influenced by above-average precipitation after fire. Future studies in desert grasslands should examine how perennial grass dynamics are affected by fire, precipitation patterns, and interactions with grazing.

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“…The seedlings can withstand low-intensity fire the following growing season; fire is sometimes applied at this time to destroy seedlings of competing species to increase the longleaf pine component. If the longleaf pines are not yet fully established, they are often topkilled, but sometimes resprout (Grace and Platt 1995). With extended periods of fire exclusion, hardwoods dominate forest openings (Gilliam and Platt 1999).…”

Section: Longleaf Pinementioning

confidence: 99%

Wildland fire in ecosystems: effects of fire on flora

Brown¹,

Smith²

2000

299

156

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_____________________________________This state-of-knowledge review about the effects of fire on flora and fuels can assist land managers with ecosystem and fire management planning and in their efforts to inform others about the ecological role of fire. Chapter topics include fire regime classification, autecological effects of fire, fire regime characteristics and postfire plant community developments in ecosystems throughout the United States and Canada, global climate change, ecological principles of fire regimes, and practical considerations for managing fire in an ecosytem context.

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Effects of Adult Tree Density and Fire on the Demography of Pregrass Stage Juvenile Longleaf Pine (Pinus Palustris Mill.)

Cited by 97 publications

References 24 publications

Effects of basal area on survival and growth of longleaf pine when practicing selection silviculture

Effects of basal area on survival and growth of longleaf pine when practicing selection silviculture

Population and clonal level responses of a perennial grass following fire in the northern Chihuahuan Desert

Wildland fire in ecosystems: effects of fire on flora

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