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The Red Hills region of south Georgia and north Florida contains one of the most biologically diverse ecosystems in North America, with longleaf pine trees that are up to four hundred years old and an understory of unparalleled plant life. At first glance, the longleaf woodlands at plantations like Greenwood, outside Thomasville, Georgia, seem undisturbed by market economics and human activity, but Albert G. Way contends that this environment was socially produced and that its story adds nuance to the broader narrative of American conservation. The Red Hills woodlands were thought of primarily as a healthful refuge for northern industrialists in the early twentieth century. When notable wildlife biologist Herbert Stoddard arrived in 1924, he began to recognize the area's ecological value. Stoddard was with the federal government, but he drew on local knowledge to craft his land management practices, to the point where a distinctly southern, agrarian form of ecological conservation emerged. This set of practices was in many respects progressive, particularly in its approach to fire management and species diversity, and much of it remains in effect today. Using Stoddard as a window into this unique conservation landscape, Conserving Southern Longleaf positions the Red Hills as a valuable center for research into and understanding of wildlife biology, fire ecology, and the environmental appreciation of a region once dubbed simply the \"pine barrens.\"

Research linking soil moisture availability to nonstructural carbohydrate (NSC) storage suggests greater NSC reserves promote survival under acute water stress, but little is known about how NSC allocation responds to long-term differences in water availabilty. We hypothesized populations experiencing chronic or frequent water stress shift carbon allocation to build greater NSC reserves for increased survival probability during drought relative to populations rarely experiencing water stress. Over a year, we measured soluble sugar and starch concentrations from branches, stems, and coarse roots of mature Pinus palustris trees at two sites differing in long-term soil moisture availability. Xeric and mesic populations exhibited a cycle of summer depletion-winter accumulation in root starch. Xeric populations reached a maximum root starch concentration approximately 1–2 months later than mesic populations, indicating delayed summer depletion. Xeric and mesic populations reached the same minimum root starch at similar times, suggesting extended winter accumulation for xeric populations. These results suggest seasonal mobilization from root starch is compressed into a shorter interval for xeric populations instead of consistently greater reserves as hypothesized. Seasonal trends differed little between xeric and mesic populations for starch and sugars, suggesting the importance of roots in seasonal carbon dynamics and the primacy of starch for storage. If roots are the primary organ for longterm storage, then our results suggest that whole-plant mobilization and allocation respond to chronic differences in water availability.

Greenwood Plantation in the Red Hills region of southwest Georgia includes a rare one-thousand-acre stand of old-growth longleaf pine woodlands, a remnant of an ecosystem that once covered close to ninety million acres across the Southeast. The Art of Managing Longleaf documents the sometimes controversial management system that not only has protected Greenwood's \"Big Woods\" but also has been practiced on a substantial acreage of the remnant longleaf pine woodlands in the Red Hills and other parts of the Coastal Plain. Often described as an art informed by science, the Stoddard-Neel Approach combines frequent prescribed burning, highly selective logging, a commitment to a particular woodland aesthetic, intimate knowledge of the ecosystem and its processes, and other strategies to manage the longleaf pine ecosystem in a sustainable way. The namesakes of this method are Herbert Stoddard (who developed it) and his colleague and successor, Leon Neel (who has refined it). In addition to presenting a detailed, illustrated outline of the Stoddard-Neel Approach, the book-based on an extensive oral history project undertaken by Paul S. Sutter and Albert G. Way, with Neel as its major subject-discusses Neel's deep familial and cultural roots in the Red Hills; his years of work with Stoddard; and the formation and early years of the Tall Timbers Research Station, which Stoddard and Neel helped found in the pinelands near Tallahassee, Florida, in 1958. In their introduction, environmental historians Sutter and Way provide an overview of the longleaf ecosystem's natural and human history, and in his afterword, forest ecologist Jerry F. Franklin affirms the value of the Stoddard-Neel Approach.

We monitored plant community assembly during the first five years of longleaf pine—wiregrass (Pinus palustris—Aristida stricta) savanna restoration on four former bahiagrass (Paspalum notatum) pastures in peninsular Florida, which were restored via removal of exotic vegetation followed by mechanical planting with a wild-harvested native seed mix. We sampled randomly selected vegetation quadrats in each restored pasture annually, as well as randomly selected quadrats in each of four reference sites. All species were assigned to one of five functional groups (C4 graminoids, C3 graminoids, forbs, legumes, or shrubs) and one of three floristic quality categories (characteristic, pioneer, or weedy). Five years after restoration, we found that native C4 graminoids had supplanted the sod-forming P. notatum as the dominant graminoids on all sites. Restored sites had higher average C4 graminoid and forb cover than reference sites, but lower average species richness in both categories. Reference sites had much higher shrub species richness and cover than restored sites. Pioneer and weedy species accounted for the bulk of the species richness on restored sites, while the majority of species on the reference sites were characteristic. Using indicator species analysis (ISA) and nonmetric multidimensional scaling, we identified species and functional groups abundant on reference sites but scarce on restored sites, and vice versa. Although species composition differed greatly between restored and reference sites, some of the pioneer species on restored sites may serve as functional analogs for wildlife food provisioning. Species richness and cover of graminoids and legumes (both important classes of wildlife foods) were comparable on reference sites and restored sites, though pioneers made up a much larger proportion of both functional groups on restored sites. Mast-producing shrubs, however, were largely absent from the restored sites, representing a deficiency in a major class of wildlife foods.

Rising atmospheric CO₂ concentration will affect belowground processes and forest function. However, the direction and magnitude of change for many soil processes are unknown. We used minirhizotrons to observe fine root and fungal dynamics in response to elevated CO₂ in a model regenerating longleaf pine community in open-top chambers. The model community consisted of five plant species common to xeric sandhills longleaf pine stands: Pinus palustris, Quercus margaretta, Aristida stricta, Crotalaria rotundifolia, and Asclepias tuberosa. Elevated CO₂ significantly increased both fine root and mycorrhizal tip standing crop by more than 50% in the deeper soil horizon (17-34 cm). Rhizomorph standing crop was nearly doubled in both deep and shallow soil (P = 0.04). Survivorship results for fine roots and rhizomorphs varied between soil depths. Fine root survivorship was likely influenced more by changes in community composition and species interactions driven by elevated CO₂ rather than by direct effects of elevated CO₂ on the fine roots of individual species. In this system, it appears that elevated CO₂ led to a greater reliance on fungal symbionts to meet additional nutrient requirements rather than substantially increased root growth.

Large wildfires are increasing across numerous regions of the globe. While the West has remained a primary focus of wildfire research and resources in the U.S., recent signals suggest that wildfire risk is increasing in the eastern U.S. as well. We conducted an in‐depth assessment of large (>200 ha) wildfire regime characteristics (size, number, total hectares burned, seasonality, probability of occurrence, and ignition source) over a 36‐year period across the Eastern Temperate Forests of the U.S. to quantify geographic patterns in large‐wildfire regime and identify changing spatio‐temporal large wildfire patterns. We found increases in large wildfire size, occurrence, number, and total hectares burned in the southern and eastern regions of the Eastern Temperate Forests. In contrast, large wildfires declined or were minimal in northern ecoregions. We demonstrate increasing large wildfires across some of the most populated regions of the United States. Plain Language Summary Large wildfires are increasing across numerous regions of the globe. While the western U.S. has remained a primary focus for wildfire research and resources, recent signals suggest that wildfire risk is also increasing in the eastern U.S. We assess patterns and changes in large (>200 ha) wildfire size, number, total hectares burned, seasonality, probability of occurrence, and ignition source over 36 years in the Eastern Temperate Forests, a region comprising most of the eastern U.S. We found that large wildfire size, occurrence, number, and total hectares burned increased in the southern and eastern portions of the Eastern Temperate Forests. In contrast, large wildfires declined or there were too few wildfires to assess in northern portions of the Eastern Temperate Forests. Our findings suggest the potential for increasing wildfire risk across some of the most populated regions of the U.S. Key Points Large wildfires are increasing in portions of the eastern U.S. The southern and eastern regions experienced the greatest increases in large wildfire number, occurrence, size, and total hectares burned Large wildfire seasonality shifted across the Eastern Temperate Forests

Ecological restoration is essential for maintaining biodiversity in the face of dynamic, global changes in climate, human land use, and disturbance regimes. Effective restoration requires understanding bottlenecks in plant community recovery that exist today, while recognizing that these bottlenecks may relate to complex histories of environmental change. Such understanding has been a challenge because few long-term, well-replicated experiments exist to decipher the demographic processes influencing recovery for numerous species against the backdrop of multiyear variation in climate and management. We address this challenge through a long-term and geographically expansive experiment in longleaf pine savannas, an imperiled ecosystem and biodiversity hotspot in the southeastern United States. Using 48 sites at three locations spanning 480 km, the 8-y experiment manipulated initial seed arrival for 24 herbaceous plant species and presence of competitors to evaluate the impacts of climate variability and management actions (e.g., prescribed burning) on plant establishment and persistence. Adding seeds increased plant establishment of many species. Cool and wet climatic conditions, low tree density, and reduced litter depth also promoted establishment. Once established, most species persisted for the duration of the 8-y experiment. Plant traits were most predictive when tightly coupled to the process of establishment. Our results illustrate how seed additions can restore plant diversity and how interannual climatic variation affects the dynamics of plant communities across a large region. The significant effects of temperature and precipitation inform how future climate may affect restoration and conservation via large-scale changes in the fundamental processes of establishment and persistence.

Tight coupling between below-ground autotrophic respiration and the availability of recently assimilated carbon (C) has become a paradigm in the ecophysiological literature. Here, we show that stored carbohydrates can decouple respiration from assimilation for prolonged periods by mobilizing reserves from transport roots to absorptive roots. We permanently disrupted the below-ground transfer of recently assimilated C using stem girdling and root trenching and measured soil CO2 efflux for over 1 yr in longleaf pine (Pinus palustris), a species that has large reserves of stored carbohydrates in roots. Soil CO2 efflux was not influenced by girdling or trenching through the 14-month observation period. Stored carbohydrate concentrations in absorptive roots were not affected by the disrupted supply of current photosynthate for over 1 yr; however, carbohydrate concentrations in transport roots decreased. Our results indicate that root respiration can be decoupled from recent canopy assimilation and that stored carbohydrates can be mobilized from transport roots to absorptive roots to maintain respiration for over 1 yr. This refines the current paradigm that canopy assimilation and below-ground respiration are tightly coupled and provides evidence of the mechanism and dynamics responsible for decoupling the above- and below-ground processes.

Fire can be a destructive, deadly element of nature, capable of obliterating forests, destroying homes, and taking lives. Den Latham's Painting the Landscape with Fire describes this phenomenon but also tells a different story, one that reveals the role of fire ecology in healthy, dynamic forests. Fire is a beneficial element that allows the longleaf forests of America's Southeast to survive. In recent decades foresters and landowners have become intensely aware of the need to \"put enough fire on the ground\" to preserve longleaf habitat for red-cockaded woodpeckers, quail, wild turkeys, and a host of other plants and animals. Painting the Landscape with Fire is a hands-on primer for understanding the role of fire in longleaf forests. Latham joins wildlife biologists, foresters, wildfire fighters, and others as they band and translocate endangered birds, survey snake populations, improve wildlife habitat, and conduct prescribed burns on public and private lands. Painting the Landscape with Fire explores the unique Southern biosphere of longleaf forests. Throughout Latham beautifully tells the story of the resilience of these woodlands and of the resourcefulness of those who work to see them thrive. Fire is destructive in the case of accidents, arson, or poor policy, but with the right precautions and safety measures, it is the glowing life force that these forests need.

Ecological restoration is a global priority, with potential to reverse biodiversity declines and promote ecosystem functioning. Yet, successful restoration is challenged by lingering legacies of past land-use activities, which are pervasive on lands available for restoration. Although legacies can persist for centuries following cessation of human land uses such as agriculture, we currently lack understanding of how land-use legacies affect entire ecosystems, how they influence restoration outcomes, or whether restoration can mitigate legacy effects. Using a large-scale experiment, we evaluated how restoration by tree thinning and land-use legacies from prior cultivation and subsequent conversion to pine plantations affect fire-suppressed longleaf pine savannas. We evaluated 45 ecological properties across four categories: 1) abiotic attributes, 2) organism abundances, 3) species diversity, and 4) species interactions. The effects of restoration and land-use legacies were pervasive, shaping all categories of properties, with restoration effects roughly twice the magnitude of legacy effects. Restoration effects were of comparable magnitude in savannas with and without a history of intensive human land use; however, restoration did not mitigate numerous legacy effects present prior to restoration. As a result, savannas with a history of intensive human land use supported altered properties, especially related to soils, even after restoration. The signature of past human land-use activities can be remarkably persistent in the face of intensive restoration, influencing the outcome of restoration across diverse ecological properties. Understanding and mitigating land-use legacies will maximize the potential to restore degraded ecosystems.