Data/hora: 24/06/2024 13:39:35

Biblioteca(s): 	Embrapa Cerrados; Embrapa Solos; Embrapa Solos / UEP-Recife.	
Data corrente: 	13/11/1996	
Data da última atualização: 	13/11/1996	
Autoria: 	LAL, R.	
Título: 	Methods and guidelines for assessing sustainable use of soil and water resources in the tropics.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Columbus, OH: Ohio State University/SMSS/USDA, 1994.	
Páginas: 	78p.	
Série: 	(SMSS Technical Monograph, 21).	
Idioma: 	Inglês	
Conteúdo: 	Degradation of soil and water resources, and environmental pollution are perceived to be major problems in the tropics. Vast areas of land are claimed to be accelerated erosion and desertification, compaction and hard setting, acidification, decline in soil organic matter content and biodiversity, and depletion in soil fertility. Theland area degraded by different processes in the tropics is estimed to be 915 x 10 6 ha by water erosion, 474 x 10 6 ha by wind erosion, 50 x 10 6 ha by physical degradation. Soil and environmental degradation, low productivity, and resource-based low-input agriculture go hand-in-hand. Soil and environmental degradation are perpetued by land misuse, and exploitative and fertility-mining systems of subsistence agriculture. Resource-poor farmers of the tropics are trapped in the ever-tightening grip of the soil degradation-low productively-poverty-low input-more degradation cycle. The concept of sustainability, useful and relevant as it is, needs to be made quantitative, objective, and reliable. There is a need to develop criteria and methods for quantitative assessment of sustainable use of soil and water resources. To do this is to: (i) identify soil and water indicators of sustainability, (ii) establish quantitative relationships between soil and water indicators and soil-modifying degradative processes on the one hand and productivity on the other, (iii) define critical limits of soil and water indicators in relation to threshold value beyond which productivity decline is...	
Palavras-Chave: 	Avaliacao; Environmental impact assessment; Evaluation; Methods; Nature conservation; Regiao tropical; Soil sustainability criteria; Sustentabilidade; Sustentability; Tropical zones.	
Thesagro: 	Água; Conservação; Conservação do Solo; Meio Ambiente; Método; Preservação da Natureza; Recurso Natural; Solo.	
Thesaurus Nal: 	guidelines; natural resources; soil; soil conservation; tropics; water; water conservation.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Cerrados (CPAC)	
Exemplares: 	CNPS - (3757-1) - ADD - LV - -- - 631.4. - L193m - 1996.00323 - DIS
CPAC - (13300-1) - ADD - LV - -- - 631.4 - L193m - 1996.0050 - DIS
CNPS-UEPR - (2506-1) - ADD - LV - PP - 631.4 - L193m - 2016.02816 - DIS