000			032920000a22005530004500
911			_aXL1996503005
901			_aK10
903			_aE
903			_aV
904			_aBCO
905			_aC
906			_a19960101
908			_aJ
909			_aAS
912			_aEn
912			_aEn
914			_aBCO1
914			_aINFOR
914			_aBN
082	0	4	_a24729
100	1		_946898 _aBarros, P.L.C. de
100	1		_989078 _aMachado, S. do A.
100	1		_951947 _aBurger, D.
100	1		_9119518 _aSiqueira, J.D.P.
260			_c1979
041	0		_aPt
500			_a2 ilus. 4 tab. Sum. (En, Pt)
520			_aThe objectives of this research were to test several mathematical models which express the diameter distribution, as well as to verify the influence of the diameter class interval in the fitness of the tested models. The models were applied individually for all species in the area, for the most frequent species and for the commercial species. The data for this research came from the National Forest of Tapajós, located in the county of Santarem, state of Para, Brazil. A total number of 11.173 trees with diameter breast height above 15 centimeters, and totalling 167 species were measured. The following mathematical models were tested to describe the diameter distribution of the area: Two negative exponential equations having the diameter and the square of the diameter as the independent variable, constituting respectively the models 1 and 2; other tested models were: Potential of Mervart, hyperbolic of Pierlot, Polymonial of Golff West, Weibull function and Beta function. The sum of squares of residual was used as a criterium to select the equations by group of species, and by class intervals. The probability associated with the number of runs of residuals, which gives the probability that the observed number of signs changes in the plot of residuals ocurred randomly, was also used. Following these criteria, among the seven tested models, to represent the relationship of the number of trees by 100 ha on diameter classes, the Beta function, the polymonial and the exponential models presented the best results in fitting such relationship. The Weibull function also seems to estimate very well the percentages of the number of trees smaller or equal to a specified diameter of the stand. In comparing class intervals the models in general presented the best results for the 10 cm class interval. The precision of the equations decreased with the decreasing of the class intervals.
650	1	4	_9144341 _aDIAMETRO
650	1	4	_9155140 _aMODELOS MATEMATICOS
650	1	4	_9143732 _aDENSIDAD DE LA POBLACION
650	1	4	_9135570 _aAMAZONIA
650	1	4	_92040 _aBRASIL
691			_9315060 _aDIAMETER
691			_9326437 _aMATHEMATICAL MODELS
691			_9332806 _aPOPULATION DENSITY
691			_9135570 _aAMAZONIA
691			_922604 _aBRAZIL
692			_aDIAMETRE
692			_aMODELE MATHEMATIQUE
692			_aDENSITE DE POPULATION
692			_aAMAZONIE
692			_aBRESIL
773	0		_tFloresta (Brasil) _d1979 _gv. 10(2) p. 19-32
040			_aCR-TuBCO _cCR-TuBCO _bEs
245	1	0	_aComparacao de modelos descritivos da distribuicao diamétrica em uma floresta tropical
942			_cANA
003			CR-TuBCO
999			_c58271 _d58271