Topic: Forest Health

Showing 51 – 60 of 107 resources

Age, allocation and availability of nonstructural carbon in mature red maple trees

The allocation of nonstructural carbon (NSC) to growth, metabolism and storage remains poorly understood, but is critical for the prediction of stress tolerance and mortality. We used the radiocarbon (14C) Ôbomb spikeÕ as a tracer of substrate and age of carbon in stemwood NSC, CO2 emitted by stems, tree ring cellulose and stump sprouts regenerated followingharvesting in mature red maple trees. We addressed the following questions: which factors influence the age of stemwood NSC?; to what extent is stored vs new NSC used for metabolism and growth?; and, is older, stored NSC available for use?

Publication:
New Phytologist
Date:
July 14, 2013

Seasonal dynamics and age of stemwood nonstructural carbohydrates in temperate forest trees

Nonstructural carbohydrate reserves support tree metabolism and growth when current photosynthates are insufficient, offering resilience in times of stress. We monitored stemwood nonstructural carbohydrate (starch and sugars) concentrations of the dominant tree species at three sites in the northeastern United States. We estimated the mean age of the starch and sugars in a subset of trees using the radiocarbon (14C) bomb spike. With these data, we then tested different carbon (C) allocation schemes in a process-based model of forest C cycling.

Publication:
New Phytologist
Date:
October 7, 2012

Asian Longhorned Beetle and its Host Trees

This pictorial guide provides basic information for identifying the Asian longhorned beetle, its injury characteristics, and its common host trees. The guide will help users detect the beetle in both urban and forested settings.

Date:
September 1, 2012

Indicator Species, Fact Sheets: Red Maple, Acer rubrum

Red Maple is a deciduous tree that can be 50 to 60 feet tall at maturity. It is wide ranging, and native throughout the eastern half of the United States. Red maple can be used for syrup production. However, it tends to bud and flower very early in the season, which has a negative effect on the sap, making the syrup season for the red maple very short.

Date:
July 21, 2012

Indicator Species, Fact Sheets: Sugar Maple, Acer saccharum

Sugar maple is a deciduous tree that can grow to a height of 50 to 130 feet. It is native to the US, and found throughout the eastern states. Sugar maple is the primary source for maple sugar and syrup. Trees are tapped for syrup in late winter/early spring throughout New England. Sugar maple is also a valuable hardwood for a variety of products from flooring to cabinets.

Date:
July 21, 2012

Influence of experimental snow removal on root and canopy physiology of sugar maple trees in a northern hardwood forest

Due to projected increases in winter air temperatures in the northeastern USA over the next 100 years, the snowpack is expected to decrease in depth and duration, thereby increasing soil exposure to freezing air temperatures. To evaluate the potential physiological responses of sugar maple (Acer saccharum Marsh.) to a reduced snowpack, we measured root injury, foliar cation and carbohydrate concentrations, woody shoot carbohydrate levels, and terminal woody shoot lengths of trees in a snow manipulation experiment in New Hampshire, USA. Snow was removed from treatment plots for the first 6 weeks of winter for two consecutive years, resulting in lower soil temperatures to a depth of 50 cm for both winters compared to reference plots with an undisturbed snowpack.

Publication:
Oecologia
Date:
July 3, 2012

Long-term impact of liming on growth and vigor of northern hardwoods

Sugar maple (Acer saccharum Marsh.) is a keystone species in the northern hardwood forest, and decline episodes have negatively affected the growth and health of sugar maple in portions of its range over the past 50+ years. Crown health, growth, survival, and flower and seed production of sugar maple were negatively affected by a widespread decline event in the mid-1980s on the unglaciated Allegheny Plateau in northern Pennsylvania. A long-term liming study was initiated in 1985 to evaluate responses to a one-time application of 22.4 MgáhaÐ1 of dolomitic limestone in four northern hardwood stands.

Publication:
Canadian Jounal of Forest Research
Date:
May 25, 2011

Root pressure in trees: a spring phenomenon

Root pressure occurs when the soil begins to warm, and when snow has melted, and icy water from snow melt has largely drained from the soil, forest soils warm quickly.

Publication:
Farming, the Journal of Northeast Agriculture
Date:
May 1, 2011

More invasive plants of the sugarbush

Identifying and removing invasive plants when they are few and small is the only way to keep from having a permanent infestation, one that will be a constant annoyance and expense.

Publication:
Farming, the Journal of Northeast Agriculture
Date:
November 1, 2010