Armazenagem da agua num solo com Floresta de Terra Firme e com seringal implantado / Water storage in the of terra firme forest and a Rubber tree plantation

AUTOR(ES)
DATA DE PUBLICAÇÃO

1991

RESUMO

Routine measurements of soil water content (neutron probe) and matric potentials (tensiometers), were made in a soil with a rubber tree plantation and a "Terra Firme" forest, during 1985 and 1986, in Manaus. The soil moisture content in the rubber tree plantation was greater than 70% of the storage capacity, and during 10 months (November to August), the drainage process was detected. The largest water storage variation, associated with the dry season of 1985, was (-27.4 ± 6.6) mm, over the (0-170) cm layer, showing the main radicular activity in the depths ranging from 50 to 120 cm, as a consequence of surface compaction. In the forest, even during the wet season (January to April), significant amounts of water were absorbed by the vegetation at the surface layer, related with short dry spells, which stop temporarly the drainage process. The highest quantity of water extracted by the root system was (-57.0 ± 7.0) mm, down to 170cm depth, and the soil moisture was maintained above 60% of the soil storage capacity. The average daily evapotranspiration in the forest, estimated in 1985 was (3.4 ± 0.4) mm/day; in the rubber tree plantation, the estimative was (2.5 ± 0.6) mm/day, or a difference of 27% in relation to the Terra Firme forest.

ASSUNTO(S)

florestas interacao ciencias meteorologicas solos seringal micrometeorologia evapotranspiracao

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