| The ability of vegetative recovery after wildfire is one of natures greatest exhibits of life will have a way. The ability of vegetative recovery after repeated wildfires is one of mans greatest ways to assure it will not. What is happening in our American Southwest through abandoned campfires and thrown away torches by illegal aliens is criminal, and deadly to our native species of flora. The likeliness of plant tissue being killed by fire depends upon the amount of heat received during the fire. This is determined by the temperature reached and the duration of exposure. Most plant cells die at a core temperature of 122 to 131 degrees (F). The tissue of the plant withstands heat by a time-temperature manner. Morality occurs at high temperatures in a very short period of time, death at lower levels requires longer exposure. Another key factor is growing seasons, growing plants are much more hardy to fires then dormant ones. It is shown this is due to the higher tissue moisture involved during growing periods. Even in cases where death was not immediate. Resulting injury from the fires can bring about deaths in a few years. These deaths are associated with secondary agent causes such as disease, fungi, or insects. As the injury to the plant reduces its resistance against these secondary issues, the plants often succumb to them. In same manner, plants weakened by drought or other such weakening events prior to the fire or after are also more likely to die. The ability of a tree to withstand fire damage is based on its bark thickness, root depth, bud sizes, needle lengths and the sheer degree of the scorch. In repetitive uncontrolled fire conditions, many of these factors are futile to the trees ability to exist at all. Conifers, being cone-bearing rely on wind and wildlife to aid with seed dispersal, in locations where wildlife has been highly reduced or abandoned there is little to nothing to populate new forests. Even if the repopulation is successful, locations with repetitive wildfires kill the young saplings before they can grow to maturity (30 to 50 years). While fire prepares the soil for a suitable seedbed through exposure of minerals for good germination of plants. Repetitive or severe burns to the location can leach minerals from the soil making it barren to sustain life. Plant recovery depends upon the types of fires affecting them. In controlled burn situations the following burns are used to benefit the habitat as well as the plant life. Types of Fires: Each type can be used in a controlled environment to successfully aid the forest and its inhabitants. In cases of illegal alien set fires, no control exists, and some or all of the various types often exist, creating destruction to natural habitats. Understory Fire: Understory fires are used to change the canopy of the forest in a significant way, by killing or top-killing a few most fire susceptible trees, and/or by killing or top-killing a cohort of tree regeneration to aid in reduction of understory plant biomass. Such understory fires in and of themselves are not dramatic, but repeated understory fires, which result from illegal set fires burning the same forests each year, create a forest structure much like a park setting where some large, old trees exist, but few understory trees can be found and vegetation is scarce. Stand-Replacement Fire: Stand-replacement fires are used to remove old or dead debris, or to allow a regeneration of an area to congested to effectively regenerate itself. Grassland: In grasslands, where prefire structures of vegetation reassert quickly, old and dead stems and litter can pile up around the root systems causing a starvation of light for any new growth. Through Stand-Replacement fire techniques, this old growth is removed allowing fresh new foliage to thrive in the first and second post fire years, with full structure reestablishment obtained in 3 years post fire. Illegal set fires do not allow such lands the time needed to fully recover and reestablish, thus resulting in historic altering of the land, the flora and the fauna which dwells there. Shrublands: In shrub-dominated locations, stand-replacement fires are useful in top-killing or killing above ground vegetation While canopy cover is severely reduced, initial regrowth increases cover of grasses and forbs. Dead stems remain and serve as perch sites for songbirds, raptors and even lizards. Reduced canopy increases visibility to predators of small mammals, but also increases visibility of predators to small mammals. Recovery of such shrub regenerated locations can be anywhere from 2 years, to more then 50 years. Illegal fires do not give recovery time to these locations and thus repeatedly reduce the canopy and permanently alter the landscape. Forests and Woodlands: In tree dominated locations, stand-replacing fires have a dramatic change on habitat structure. These fires consume not only the tree crown, but also destroy surface vegetation as well. This destroys all cover and canopy. They transforming the habitat they once existed in. It takes 10 to 20 years to replace the forest floor biomass and an additional 30 to 50 years to replace the canopy. Uncontrolled Illegal set fires offer no time for this replacement of habitat to reestablish itself, and does not weight the dangers of where or what direction it impacts thus creating great threats to the flora and fauna existing in those affected locations, possibly even extinction of some species already threatened. Severe threats with illegal alien caused fires is that none of those stand-replacement fires are in controlled settings. As such some or all of them might apply at any given time to any fires set in our National Parks and Forests. They offer no recovery time for the ecosystems to reestablish themselves in affected locations. Trees Responses to fire varies considerable among coniferous and deciduous trees. While certain trees and shrubs have root systems which allow for regeneration by forming new stems or "suckers", other trees such as conifers do not have such response systems in place and suffer greatly. For a conifer to survive, some roots, the main trunk cambium , and the buds must survive. Species with no ability to spout after fire include: White Fir Douglas-Fir Sub alpine Fir Engelmann Spruce Colorado Blue Spruce Pinion Pine Lodgepole Pine Limber Pine Ponderosa Pine Sub alpine Pine Juniper Species able to root crown. Gambel Oak Birch Aspen Alder Cottonwood Shrubs. Forbs, Grasses Unlike trees, shrubs, forbs (common wildflowers), and grasses readily sprout from underground root systems after fires. These root systems vary in size, depth and shape due to the soil. Fire severity have heavy impacts upon these structures. Slow moving fires destroy what is called the duff layer and heat soils to lethal temperatures destroying shallow root systems. Such as shrubs have similar root structures and will resprout after fires. Their ability to resprout depends on the severity of the fire and depth of the root structures. Many grass species do regenerate readily after fires. The buds and growing points (meristems) are well protected deep in soil. Aeriel Crown Mortality Woody plants have high probability of destruction of their above ground portions during fire. Characteristics and factors which come into play are branch density, ratio of live to dead crown materials, location of base of crown in respect to fuels and the overall total crown size. Height plays a crucial element in survival, as small stature plants and trees are most often then not killed. As well species with self-pruning ability in which they shed their lower dead branches stand a greater chance of survival as the ires are less likely to be carried upward to the crowns. For the aeriel crown to survive, buds and branch cambium must survive. In conifers this means those with short needles, small buds and crown scorch will not survive the fire impact. In long needled, large bud trees where crown scorch is minimum survival is much greater in the species. Crown scorch is primarily caused due to peak temperature heat influxes which are associated with the passage of flame from the fire front. Fuel concentration burnouts, which happen after the passing of flame front if long term can also cause crown scorch. Surrounding heat also plays into factor of crown scorch, on hot days with minimum wind there can be as much as a 25 percent higher increase to crown scorch then on cooler days due to increase of overall temperature involved. Stem Mortality In fires where aeriel crowns are not burned, trees and shrubs still my be vulnerable due to girdling. Girdling is caused by lethal heat of the cambiel layer of the plant. The cambiel layer is the layer of active growth just beneath the bark itself. Fire resistance of the stems themselves are based on the thickness of the bark. This thickness is determined by several factors, which include: species, diameter, age, distance above ground, location and health of the tree. Additional factors are structure, compensation, density and moisture content of the bark itself. Complete basal girding in general is caused only by smoldering ground fires due to the amount and distribution of dead wood at or near tree base. Girdling causes fire scars, these scars often become infected by wood-inhabiting microorganisms including decay fungi with high mortality rate. Root Mortality Root growth also play a very important role in a trees survival from fire. Where trees structural support roots grow laterally near the surface, they are more susceptible to fire damage then those that grow deeper under the surface. As well roots formed under organic layers are more likely to be consumed or lethally heated then those located in mineral based soil layers. A plants feeder roots who's use is to collect the tree's water and nutrients are small in diameter and located near the ground surface. As such they are essential to the survival of the plants life. Fires set during dormant seasons generally have lesser effect upon the trees roots then those set during growing seasons. While the occasional burn may injure or kill a few feeder roots thus weakening the plant. Frequent burning at the trees root base is deadly to all species. Woody Plant Regeneration Many woody plants have what are known as dormant buds which are located in tissues of stems found above or below the ground surface. In some these buds sprout from the root collar itself at point where the root spreads out from the base stem. While in healthy forests a fire loss of these new sprouting buds is recoverable, in locations where repeat fires affect the newly sprouted saplings, species destruction is of high concern. Post fire sprouting can vary with plant age as well. Young plants which have developed seeds might be able to sprout until they reach certain age determined by that species. Older plants of certain species often are only able to produce few surviving sprouts. Plant regeneration is also determined by the severity of the fire affecting the area. Fire Severity Types
growing roots near surface and even unprotected stem buds, it has little effect on most buried plant parts and can actually aid in stimulating Post fire sprouting of species.
duff layer. It incinerates plant structures in litter and the upper duff layer, and may kill buds on portions of upright stems beneath the surface, and on upper part of root crowns.
species even with regenerative structures in duff layer, or duff-mineral soil interface. It as well is able to produce lethal heat to some plant parts in the upper soil layers as well. Forbs Forbs are broad leaf perennials which completely regrow their leaves and stems each year after dying back during winter colds or summer droughts. If fire occurs when herbaceous plants are seasonally dormant, the fire does not remove the sources of inhabitation due to the above ground leaves and stems are curled or decomposed. The ability of herbaceous species to recover after fire depends largely upon whether their regenerative structures have been exposed to lethal temperatures. Grasses Grasses are more forgiving to fires and burning is often used to rid areas of unwanted grass layers. Most grasses are only killed when all meristems and buds are lethally heated, or if fire burns in the cured litter of annual grass while perennial grass are still actively in their growth period. Fire vs Soil Fire creates significant changes in a burn sites conditions. Severity and pattern of the fire play key rolls in these changes. In bare mineral soil seedbeds, allelopathic chemicals are vilatized, nutrients more readily available and mineral soil does not dry as readily as organic materials. In severe fire locations, where feeder roots and seeds are killed off. There may be little shade in the first few Post fire years due to plant mortality. The physiological requirements of individual species determine whether Post fire conditions are favorable for seedlings to be established. Some species which reestablish from seed may be temporarily eliminated from burned areas due to unfavorable Post fire environments. In locations of repetitive fires, such as those caused by untended campfires and discarded torches from illegal aliens, time for nature to reestablish favorable conditions is not met and the land and flora can not regenerate. Hope It is not a matter of that nature can not rebuild herself from the damage done. Though quite possibly at the cost of some endangered species if action is not taken quickly to protect them. It is a matter that nature is not given the time to rebuild herself due to human actions from those who show no respect for nature herself |
Illegal Alien Wildfire Affects On Native Plant Species
BAG LADIES (and men)
| Cleaning up the environment isn't optional! |
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| We do not inherit the earth from our ancestors, we borrow it from our children. -Native American Proverb |
| Where have all the flowers gone? |
