000			028160000a22005290004500
911			_aXL1996502608
901			_aF40
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	_a24650
100	1		_9130220 _aWadsworth, F.H.
260			_c1969
041	0		_aEn
500			_a1 tab. 11 ref. Sum. (En, Pt)
520			_aUncontrolled explotation of tropical forests is unnecessarily destructive of the environment. Prior to exploitation the forest may produce good timber, productive soil, and attractive scenery. Afterward the forest at best no longer produces useful timber. At worst the trees are gone and the soil is not only incapable of producing any crop but its erosion damages other lands downstream. To utilize fully tropical forests and yet to sustain their usefulness it is necessary to inventory all of their resources, determine and respect the use limits they can sustain, and so integrate the uses as to protect those most vulnerable to conflict and provide maximum sustainable benefits. Multiple-use management cannot be perfected without continuing research. Its virtues must be demonstrated, and logically by foresters, if they are to be generally accepted and supported. Timber production areas must be diagnosed to determine the adequacy and silvicultural needs of advance regeneration. If adequate it may be managed with almost no disturbance of the soil. If inadequate it must be replaced with a new crop, a practice which may also be protective of soil values. Good management of the best timber sites not needed for other purposes could produce yields adequate to supply not only the foreseeable timber requirements of the tropics but also a substantial contribution toward those of the temperate zone as well.
650	1	4	_9145083 _aECOLOGIA FORESTAL
650	1	4	_9154696 _aMETODOS
650	1	4	_9136371 _aAPROVECHAMIENTO FORESTAL
650	1	4	_9160264 _aPRODUCCION DE MADERA
650	1	4	_9167824 _aUSO MULTIPLE DEL BOSQUE
650	1	4	_9138300 _aBOSQUE TROPICAL
691			_9148309 _aFOREST ECOLOGY
691			_9154652 _aMETHODS
691			_9343318 _aWOOD PRODUCTION
691			_9328005 _aMULTIPLE USE FORESTRY
691			_9341801 _aTROPICAL FORESTS
692			_aECOLOGIE FORESTIERE
692			_aMETHODE
692			_aPRODUCTION DU BOIS
692			_aFORESTERIE A OBJECTIFS INTEGRES
692			_aFORET TROPICALE
773	0		_tAnais da Academia Brasileira de Ciencias (Brasil) _d1969 _gv. 41 (supl.) p. 101-109
040			_aCR-TuBCO _cCR-TuBCO _bEs
245	1	0	_aTechniques for surveys and the ecological exploitation of tropical forests
942			_cANA
003			CR-TuBCO
999			_c58174 _d58174