Download or read book Comparative Symptomatology of Waldsterben and Spruce Decline in the Northeastern United States and the Federal Republic of Germany Using Norway Spruce Red Spruce and White Spruce written by Heiko Liedeker and published by . This book was released on 1988 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the US FRG Research Symposium written by and published by . This book was released on 1989 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Journal of Botany written by and published by . This book was released on 1994 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decline and Mortality of Red Spruce in West Virginia written by and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Symptomatology Trend of Tree Condition of Red Spruce Balsam Fir written by and published by . This book was released on 1994 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Damage Agents Associated with Visual Symptoms on Red Spruce and Balsam Fir in the Northeastern United States written by Susan Marie Cox and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Northeastern Area Forest Health Report written by and published by . This book was released on 1993 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1986 with total page 1920 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Premature Needle Loss of Spruce written by and published by . This book was released on 1990 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Forest Die back Symptoms on Norway Spruce Picea Abies L Karst and Red Spruce Picea Rubens Sarg in Europe and America written by Heiko Liedeker and published by . This book was released on 1986 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Red Spruce Winter Injury in 2003 written by Brynne Lazarus and published by . This book was released on 2004 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Red spruce (Picea rubens Sarg.) winter injury is caused by freezing damage that results in late winter reddening and early summer abscission of the most recent foliar age class. Abundant winter injury to the current-year (2002) foliage of red spruce became apparent in the northeastern United States in late winter, 2003. To assess the severity and extent of this damage, we measured foliar winter injury at 28 locations in Vermont and adjacent states and bud mortality at a subset of these sites. Ninety percent of all trees assessed showed some winter injury, and trees lost an average of 46% of a current-year foliage. An average of 32% of buds formed in 2002 were killed in association with winter injury. Both foliar and bud mortality increased with elevation and with crown dominance, and bud mortality increased with greater foliar injury. Foliar injury in 2003 at a plantation near Colebrook, NH, was more than five times typical levels for nine previous years of measurement and more than twice that measured for another high-injury year. Plantation data also indicated that bud mortality in 2003 was greater than previously documented and that repeated winter injury was associated with increased tree mortality. Comparisons of our data with past studies for two native spruce sites also indicated that damage in 2003 was greater than other recently reported high-injury years. Because heavy foliar and bud losses can severely disrupt the carbon economies of trees, the 2003 winter injury event could lead to further spruce decline and mortality, particularly among dominant trees at higher elevations. Understanding the spatial patterns of this injury across the landscape may help support or refute hypotheses regarding causation and highlight areas most at risk for spruce decline and mortality. Relationships between winter injury on dominant and codominant trees and plot elevation, latitude, longitude, slope, and aspect were investigated. Least squares regression showed that injury was greater on west-facing than east-facing plots, was more severe in the western part of the study region, and increased with elevation. Many third and fourth order interactions among the measured variables were also significant using this approach, suggesting the presence of complex spatial relationships. Geographically weighted regression (GWR) was used to examine these relationships. This technique was designed to detect spatial nonstationarity (the variation of parameters over space), and to help distinguish effects that are global in scale from those that show localized patterns. The combined analyses detected the following set of spatial patterns: injury increased with elevation; injury increased from east to west across the study region; injury was greatest on steep slopes at high elevations and on shallower slopes at lower elevations; injury increased with degree to which plots faced west, except at the highest elevations, where injury was uniformly severe; and injury increased with degree to which plots faced south, except at the highest elevations in the northern part of the study region, where injury was uniformly severe. Because injury was greater in areas that historically received greater hydrogen ion inputs -- the western part of the study area, on west-facing slopes, and at higher elevations -- the observed pattern of injury supports the hypothesis that acidic deposition acts on a landscape scale to exacerbate winter injury to red spruce.

Download or read book Spruce Decline and Diaporthe written by Christine K. McTavish and published by . This book was released on 2019 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Damage Agents Associated with Visual Symptons on Red Spruce and Balsam Fire in the Northeastern United States written by Susan Cox and published by . This book was released on 1991 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimation of decay in old growth western hemlock and Sitka spruce in southeast Alaska written by Wilbur A. Farr and published by . This book was released on 1976 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cooperative Survey of Red Spruce and Balsam Fir Decline and Mortality in New York Vermont and New Hampshire 1984 written by and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluating the Influence of Disturbance and Climate on Red Spruce Picea Rubens Sarg Community Dynamics at Its Southern Range Margin written by Relena Rose Ribbons and published by . This book was released on 2011 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Picea rubens(red spruce) populations experienced a synchronous rangewide decline in growth and vigor starting in the 1960's, which was likely caused by climate change or environmental disturbances (e.g., acid deposition); However, it is yet unknown if populations continue to decline or have recovered. In the context of global warming, red spruce is a species of concern because it is at its southern continuous range margin in Massachusetts. This study uses tree-ring data coupled with population data from permanent plots to quantify the status of red spruce in Massachusetts. Tree cores were extracted from red spruce and used to examine radial growth rates, determine a growth-climate relationship, and document disturbance events. Red spruce at these plots ranged from 90 to 184 years old, and comprised 15 to 29 m2/ha-1 basal area. Over the past 50 years, red spruce has decreased in density, basal area, and relative importance while red maple, yellow birch, and American beech have increased. Red spruce saplings persisted in some plots, but the sapling layer was comprised mostly of American beech or red maple. However, red spruce seedlings were common at red spruce dominant plots indicating that if favorable conditions occur, it could return to its more dominant position in the canopy. Dendroclimatological analyses show that red spruce is sensitive to both temperature and precipitation. Most sites are correlated with temperature, while only two forests were correlated to precipitation. The general temperature response of the red spruce studied was positively correlated with winter temperatures while the general precipitation response was negatively correlated with precipitation. Temporal analysis of the climate-growth response indicates that red spruce here have not had a temporally-stable, climate-growth relationship. Prior to 1960, radial growth was positively correlated with temperatures from November of the previous growing season to January of the current year. After 1960, all sites showed a shift in growth responses consistent with increased summer temperature stress; narrowed tree rings were formed during warm temperatures in July and August. Precipitation remained relatively constant over the past century, while temperatures have increased up to 2°C across the study area. Of the two precipitation-sensitive forests, one forest shifted from being positively correlated with current January precipitation to negatively correlated with previous October precipitation while the second forest showed a strong positive relationship with August precipitation. Because the radial growth of red spruce here are mostly constrained by temperatures, there has been negative growth response to regional warming and precipitation has been stable, I suggest the change in climate response is potentially due to warming and a physiological threshold response to increasing temperatures. Interestingly, disturbance frequency and intensity have increased over the same time period, which could be either a trigger or a response to the shift in the growth-climate relationship.

Download or read book A Guide to Forest Disease Research in the Northeast written by United States. Forest Service and published by . This book was released on 1963 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: