Data/hora: 21/09/2024 10:01:06

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	01/10/1997	
Data da última atualização: 	05/04/2017	
Autoria: 	PARTON, W. J.; OJIMA, D. S.; SCHIMEL, D. S.	
Título: 	Environmental change in grasslands: assessment using models.	
Ano de publicação: 	1994	
Fonte/Imprenta: 	Climate Change, v.28, p.111-141, Oct. 1994.	
Idioma: 	Inglês	
Conteúdo: 	Modeling studies and observed data suggest vthat plant production, species distribution, disturbance regimes, grassland biome boundaries and secondary production (i.e., animal productivity) could be affected by potential changes in climate and by changes in land use practices. There are may studies in which computer models have been used to assess the impact of climate changes on grassland ecosystems. A global assessment of climate change impacts suggest that some grassland ecosystems will have higher plant production (humid temperate grassland) while the production of extreme continental steppes (e.g., more arid regions of the temperate grasslands of North America and Eurassia) could be reduced substantially. All of the grassland system studied are projected to lose soil carbon, with the greatest losses in the extreme continental grassland systems. There are large differences in the project changes in plant production for some regions,  while alterations in soil C are relatively similar over a range of climate change projections drawn from various General Circulation Models (GCM's ). The potential impact of climate change on cattle weight gains is unclear. The results of modeling studies also suggest that the direct impact of increased atmospheric CO2 on photosynthesis and water use in grassland must be considered since these direct impacts could be as large as those due to climatic changes. In addition to its direct effects on photosynthesis and water use, elevated CO2 concentrations lower N content and reduce digestibility of the forage.	
Palavras-Chave: 	Ecosystem; Grassland; Model; Modelo; Plant production.	
Thesagro: 	Ecossistema; Pastagem Nativa; Planta; Produção.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (35057-1) - ADC - SP - PP - SP15419 -  - 15419 - DIS