Data/hora: 17/06/2024 03:23:44

Biblioteca(s): 	Embrapa Florestas; Embrapa Pantanal.	
Data corrente: 	30/08/1991	
Data da última atualização: 	25/08/2009	
Autoria: 	SOARES, R. V.	
Título: 	The use of prescribed fire in forest management in the State of Parana, Brazil.	
Ano de publicação: 	1977	
Fonte/Imprenta: 	1977.	
Páginas: 	203 p.	
Idioma: 	Inglês	
Notas: 	Dissertation (Doctor of Philosophy) - University of Washington.	
Conteúdo: 	A main concert about using fire in forest managemet in the effect thatburning might have upon the envoroment.In order to test the hypotesis that prescribe fire could be used as a management tool in Parana State, a review of the pescribe fire effects on several regions troughout the world was done.The review was, as much as posible, matched aganist theenviromental conditions of Parana. Results from this comparative analysis indicate that prescribe fire can be used of fire are expected to outweigh any eventual damage to the environment. Most soils used for reforestation in Parana are acid and poor in nutrients.The use of pescribed burning rather than damaging the soil would possibly bring about twoimmediate benifitis: reduce acidity and recicle nitrients. Organic matter prior to mineralization is not avaiable to plants and are  only important as a nutrient reserve for the distant future. Some nutrientes maybe lost  by leaching after a fire, but these losses may be compensated for may be lost leaching after fire, but these lots of a considerable quantity of available nutrients. Even though no fire should be pescribe to improve soil fertility,the use of fire for other purposes probably will be more benenficial than harmful to the those soils. Highly erodable soils on steep slopes could be damaged by the use of prescribe burning and fire should not be on such areas.The efect of fire on soil depends primarily on the  fire. Extremely intense long lasting fires can severely danage soils of different types. On prescribed fires,however,the intensity can be controlled by proper prescription and firing techiniques. Besides the direct beneficial effects to the soil, prescribed fire would  decrease the chance of a not hot wildfire occurrence, wich wolud be harmful to the soil. Prescribed fire is one of reducing the accumulation of fuel in forest areas. Even thought there are other means of reducing fuel acculmulation, fire should be a preferred treatment  because of its low cost,comparatibly with other land-use objectives and compatibily of accomnplishing several management obljectives at one time. The planted forests in Parana have accimulated large amounts of fuel. On pine yers old.After the first thining operation, a 7 years-old  slash or loblolly pine stand presents aproximately 15.3 tons of total fuel per hactare. A wildfire burning on such conditions would certainly destroy the plantation. Even thoght there is no means to calculate the fuel per hectare.A wildifire burning on such conditions would certainly destroy the plantation. Prescribed burning seems to be the best alternative to alleviate the problem of fuel accumulation in planted forests in Parana. The principal forest types planted in Parana region are fireresistant after the trees are about 6 meters high.Therefore they can support a mild backfire for a first fuel reduction. After the first fuelreduction, interval between burns should be determined according to thefuel reduction, be interval between burns should be determined according to the fuel reduction, be interval between burns to the fuel acumulation and other firing techiniques may be used.The old natural stands of Brazilian pine, the most important natural species in the coutry, are being gradually replaced by hardwoods because there is no satisfactory natural regeneration of the species nder present conditions.The comparative analysis used here indicates that Brazilian pine probably is a sereal species that needs some disturbance to regenerate and perpetue itself, prescribed fire is a disturbance that could succional trend toward the hardwood climax, favoring the continuance of the Braziliam pine is a fire resistant species in its juvenal and adult stages. Site preparation,improvement of wildlife habitat,control of parasites and diseases,control of unwanted vegetation are some examples of other objectives that the compsarative analysis suggests could be accomplished with the use of carefully planned prescribed fire. Prescribed burning is not intendend to replace or displace orthodox protetion. Prescribed fire has its limitations and even a strong prescribed fire program cannot completely eliminate the risk of wildfire occurrences. Traditional wildfire protection is to be continued troughout the State of Parana. The estimation of fire protection budget however,could be done in more analytical basis rether than relying only on experience and julgement of pastpolicies. A suggestion for budget estimation and resorce allocation based on the value of the forest and the potential wildfire risk in the area is developed in the Appendix I. The results presented here the first step or the  basis for prescribed fire program in the State of Parana. Theoretically,  the use of prescribed fire  aimed to achieve certain forest management goals in the region  is perfectly viable.The next step on the program should be fiel reserch.Some experimental burns should be carried  out on stands where fire could help in achieving some management goals, like  fuel reduction  for example. Prescriptions for those burns would be writhen important to minimize the risk of damage or losing control of the fires. The first burns sould be carried out on sites where  fuel loading is not experimental burns is important in determining the feasibility and practicality of the third step, the use  ofprescribed burning in large scale consist only in checking wether the prescriptions were met but also in observing post-effects of fire on soil and vegetation.	
Palavras-Chave: 	Ecosystem; Efeito; Fire; Forest; Magagement; Management; Parana.	
Thesagro: 	Agronomia; Ecossistema; Floresta; Fogo; Incêndio Florestal; Manejo; Queimada; Vegetação.	
Thesaurus Nal: 	agriculture; agronomy; Brazil; forest fires; vegetation.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (29904-1) - ADC - TS - -- - TS0159 -  - TS0159 - DIS
CPAP - (32512-1) - ADC - TS - PP - TS91.00024 -  - 1991.00024 - DIS