Temporal Changes in Crown Condition Indices, Needle Litterfall, and Collateral Needle Injuries of Ponderosa and Jeffrey Pines

Miller, Paul R.; Rechel, J.

doi:10.1007/978-1-4612-1436-6_8

Cited by 11 publications

(9 citation statements)

References 9 publications

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“…Measurements of crown conditions in 1974 clearly showed a trend for decreased amounts of O 3 injury from plots on the western edge of the forest closest to Los Angeles to those in the northeast. Remeasurements of those same trees in 1988 showed general improvements in crown conditions at all plots except Camp Paivika, the plot with the highest amount of O 3 injury and the highest input of ambient O 3 (Miller and Rechel 1999). Data from remeasurements of a smaller subset of plots in 1994 showed that pines at Camp Paivika showed no improvement in O 3 injury scores over the 20-year period and that the condition of trees at Camp Angeles and Heart Bar had only slightly improved ( fig.…”

Section: Air Pollution Effects On Conifer Forests-temple and Othersmentioning

confidence: 99%

“…Although the FPM injury score showed only slight improvement over the 20-year period from the 1970s until the 1990s, other measures of tree health indicated that severely injured pines were capable of recovering in response to lower ambient O 3 in recent years (Miller and Rechel 1999). Measurements of the number of annual whorls retained on a sample of over 200 ponderosa pines at Dogwood campground, near Blue Jay, showed that in 1973 most pines held only two to three annual whorls ( fig.…”

Section: Air Pollution Effects On Conifer Forests-temple and Othersmentioning

confidence: 99%

“…By 1992 many more pines retained four to five annual whorls ( fig. 3), and 43 percent of all the pines showed improvements in crown condition as indicated by increased needle retention (Miller and Rechel 1999). Increased needle retention has been reflected in increased tree growth in recent years in the same area (Arbaugh and others 1999).…”

mentioning

confidence: 99%

“…Despite the relatively high O 3 injury scores and high rates of foliar senescence and abscission of ponderosa pines at Camp Paivika, many of these trees have greater relative growth rates and higher standing biomass than ponderosa pines growing in less polluted areas (Grulke and Balduman 2000). The high rates of N deposition at the western end of the gradient appear to compensate for, or indeed override, the adverse effects of O 3 in this area.Although the FPM injury score showed only slight improvement over the 20-year period from the 1970s until the 1990s, other measures of tree health indicated that severely injured pines were capable of recovering in response to lower ambient O 3 in recent years (Miller and Rechel 1999). Measurements of the number of annual whorls retained on a sample of over 200 ponderosa pines at Dogwood campground, near Blue Jay, showed that in 1973 most pines held only two to three annual whorls ( fig.…”

mentioning

confidence: 99%

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Planning for biodiversity: bringing research and management together; Proceedings of a Symposium for the South Coast Ecoregion

Kus¹,

Beyers²

2005

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Southern California, recognized as a major center of biodiversity, contains some of the most diverse habitats of any landscape in North America. The ever-expanding human population of the region desires land, water, resources, and recreation, creating conflict with the habitat requirements of many rare species. Managing resources in a way that maximizes biodiversity in remaining habitats, while providing opportunities for other appropriate uses of the land, presents a formidable challenge, requiring coordination between scientists and resource managers. The papers in this proceedings volume reflect the breadth of issues facing the science and management communities in southern California, ranging from the threats of fire, air pollution, grazing, exotic species invasion, and habitat loss on native habitats and sensitive species, including birds, mammals, reptiles and amphibians, to the role of mycorrhizal fungi as indicators of biological change.Retrieval Terms: air pollution impacts, biological diversity, California south coast ecoregion, fire management, habitat management, rare species Technical CoordinatorsBarbara IntroductionSouthern California contains some of the most diverse habitats of any landscape in North America and is recognized as a major center of biodiversity. It is also home to an ever-expanding human population, with needs for land, water, resources, and recreation that conflict directly with the habitat requirements of many species. As a result, this region has more endangered and threatened species than any other area in the continental United States, and once-extensive natural communities, many of which are unique to the ecoregion, have been reduced to mere remnants.Managing resources in a way that maximizes biodiversity in remaining habitats while providing opportunities for other appropriate uses of the land presents a formidable challenge requiring coordination between scientists and resource managers, yet few opportunities exist for regular exchange of information and ideas between these groups. In response to this need, the U.S. Geological Survey and the USDA ForestService partnered to co-host a symposium on "Planning for Biodiversity: Bringing California. The goal of the 3-day conference was to identify the current status of our knowledge and gaps in our understanding of regional biodiversity and ecosystem processes, present and future threats to species and habitats, and effective monitoring strategies for southwestern and central coastal California resources. Through a program of 52 invited presentations, 18 contributed posters, and 10 focused discussion groups, the conference created an environment for formal and informal communication among the 300 attendees about the results of scientific studies and their application to resource conservation and management, as well as the information needs of managers responsible for determining and implementing management on the ground.Of the 45 technical papers presented at the conference, 14 are included in this volume. Authors were asked to...

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Section: Air Pollution Effects On Conifer Forests-temple and Othersmentioning

confidence: 99%

Section: Air Pollution Effects On Conifer Forests-temple and Othersmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Planning for biodiversity: bringing research and management together; Proceedings of a Symposium for the South Coast Ecoregion

Kus¹,

Beyers²

2005

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“…Ponderosa pine is among the most susceptible plant species to ozone injury in the San Bernardino Mountains, and many have already died due to a combination of stresses, including oxidant injury, bark beetle attacks and disease (Pronos et al, 1999). Pine trees from highly polluted western areas of the mountain range had greater symptoms associated with ozone injury, including decreased radial growth (Miller, 1992), reduced fine root mass and belowground allocation of carbohydrates (Grulke et al, 1998), chlorotic mottling of needles and reduced needle retention (Miller, 1973;Miller and Rechel, 1999). Both ozone and nitrogen deposition decreased needle retention in pines (Grulke and Balduman, 1999).…”

Section: Introductionmentioning

confidence: 98%