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sábado, 24 de octubre de 2015

NSF: Morticulture: Forests of the living dead .- Morticulture: Bosques de los muertos vivientes

Hola amigos: A VUELO DE UN QUINDE EL BLOG., ¿Qué es más vivo: un árbol vivo o un muerto? La respuesta podría sorprenderle.
En un árbol vivo, sólo una fina capa de madera y corteza crecen y se transportan agua y nutrientes desde las raíces hasta las hojas. Un árbol muerto está llena de vida: insectos, hongos, bacterias y otros organismos. Muchos árboles caídos tienen alfombras verdes de las plantas cubiertas a través de sus superficies.
Árboles muertos tardan mucho tiempo en desaparecer, lo que permite una nueva vida a surgir dentro de ellos. El biólogo Mark Harmon, de la Universidad Estatal de Oregon (OSU), también conocido como "Doctor Muerte" por su interés científico en la mortalidad bosque, participa en un estudio de 200 años de duración para controlar la descomposición de los árboles.
Puede parecer un proyecto de ciencias de largo, pero refleja el ritmo al que se produce el cambio en los registros.
"La vida en el interior de un tronco en descomposición es un bosque microscópica dentro de un bosque, lleno de vida en miniatura," dice Matt Kane de la División de Biología Ambiental de la Fundación Nacional de Ciencia (NSF), que financia la investigación de Harmon través de su OPUS o Oportunidades para la Promoción Comprender a través de síntesis, el programa. "Estas formas de vida más pequeñas - insectos, hongos y bacterias - son reservas de diversidad que reciclan nuestra biosfera."
More information............
Scientists unearth importance of dead wood to forest ecosystems
dead trees in a forest
Nutrients from decomposing logs go back to the forest floor, where they feed life in soils.
Credit and Larger Versión
October 19, 2015
The following is part 19 in a series on the National Science Foundation's Long-Term Ecological Research (LTER) Network. Visit parts one, two, three, four, five, six, seven, eight, nine, 10, 11, 12,13, 14, 15, 16, 17, and 18.
Which is more alive: a live tree or a dead one? The answer might surprise you.
In a live tree, only a thin layer of wood and bark grow and transport water and nutrients from roots to leaves. A dead tree teems with life: insects, fungi, bacteria and other organisms. Many downed trees have verdant carpets of plants draped across their surfaces.
Dead trees take a long time to disappear, allowing new life to spring up within them. Biologist Mark Harmon of Oregon State University (OSU), also known as "Dr. Death" for his scientific interest in forest mortality, is taking part in a 200-year-long study to monitor the decomposition of trees.
It may seem like a long science project, but it reflects the pace at which change happens in logs.
"Life inside a decaying log is a microscopic forest within a forest, teeming with miniature life," says Matt Kane of the Division of Environmental Biology at the National Science Foundation (NSF), which funds Harmon's research through its OPUS, or Opportunities for Promoting Understanding through Synthesis, program. "These tiniest life forms--insects, fungi and bacteria--are reservoirs of diversity that recycle our biosphere."
From death, life
In the mid-1980s, Harmon and other scientists dragged hundreds of logs with different diameters into an old-growth Douglas fir forest at NSF's H.J. Andrews Long-Term Ecological Research (LTER) site in Oregon.
They watched as beetles moved into the dead logs. "Beetles foster decomposition through the fungal spores they track deep into the logs," says Harmon. "The fungi use the toughest part of the wood as food. In doing so, they help release nutrients into the soil."
Over 30 years of observation, scientists estimate that hundreds of species have moved in and called the dead trees home.
Despite the expectation that all dead wood would decompose at a slow and steady rate, Harmon has found that tree rotting is a unique process. It depends on the tree species, the fungi that take up residence, the moisture content, the geographic location and the size of the tree.
Decomposing logs replenish soils
Scientists now know that some of the nutrients from a rotting log are returned to the forest floor to replenish the soil almost immediately.
Before Harmon's study, foresters often spent considerable expense and effort on removing dead trees and log debris. Now it's common for loggers to leave downed trees in the forest, a practice Harmon calls "morticulture."
Doing so creates a more diverse landscape, leaves nutrients on site, and provides habitat for species like bluebirds and woodpeckers that nest in tree cavities.
Dead wood: an important resource
Dead wood was long considered a wasted resource and a hazard in forest landscapes.
But it performs a range of ecological functions: as habitat and food sources for many terrestrial and aquatic species; seedbeds for plants, including new trees; a source of water, energy, carbon and nutrients for the entire forest; and an agent that controls stream structure and function, reports Harmon in a 2013 paper in the journal Forest Ecology and Management.
Research on dead wood has since gone global. Dead wood is now a key feature of understanding forest biodiversity and carbon cycling as well as how stream systems function.
Knowing the ecological value of dead wood influenced forestry practices and development in the Pacific Northwest. That, in turn, changed forest management plans throughout North America and around the world.
Today, many stream habitat restoration projects, for example, focus on the reintroduction and maintenance of large pieces of dead wood in channels to create habitat for species such as salmon.
The art of dead Wood
Harmon and other scientists at OSU have invited artists to use the idea of dead wood as a starting point for creating various types of artwork. An exhibit, "Rot: The Art of Dead Wood or The Afterlife of Trees," will be unveiled in February 2016 at the Corvallis Art Center.
Harmon hopes the exhibit will bring an awareness of the value of dead trees to the public.
"Dead trees don't go to Heaven," Harmon says. "They're right here, sometimes buried under leaf litter, but nonetheless present."
Logs aren't forest ghosts, says Dr. Death. They're still among us, filled with life.
-- Cheryl Dybas, NSF (703) 292-7734 cdybas@nsf.gov
Investigators Mark Harmon
Related Institutions/Organizations Oregon State University
Total Grants $146,900
Related WebsitesNSF H.J. Andrews LTER Site:
NSF News: Opportunities for Promoting Understanding through Synthesis program awards $1.5 million in new grants:
logs and tress near a stream
Scientists are finding that dead wood is very much alive.
Credit and Larger Version
Biologist Mark Harmon in the forest holding a piece of dead tree
Biologist Mark Harmon, also known as "Dr. Death," studies the importance of dead trees to forests.
Credit and Larger Version
A decaying log covered with plants
A decaying log is a microscopic forest within a forest.
Credit and Larger Version
trees killed by an infestation of the spruce budworm
Trees killed by an infestation of the spruce budworm will soon fall.
Credit and Larger Version
New growing trees next to dead log in a forest
From death, life. New growth sprouts from lifeless logs, and will soon replenish the forest.
Credit and Larger Version
the National Science Foundation (NSF),
Guillermo Gonzalo Sánchez Achutegui
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