Actual condition of sago palm forest and its starch productivity in East Sepik Province, Papua New Guinea. 1. Outline of survey area and natural environmental conditions of sago palm forest.:1. Outline of survey area and natural environmental conditions o

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Over the 1982-85 period we have been going with the investigations into sago palm forest in the Sepik River Basin, East Sepik Province, where"sago eaters"live.<BR>Acreage of sago palm forest in this area amounts to 400, 000ha, ranginjg from natural stands to semi-cultivated stands. The vegetation including sago palm are divided into three types: sago palm phragmites swamp, sago palm swamp and sago palm forest. Semi-cultivated sago stands in sago palm forest are utilized by natives in a limited area.<BR>Many of sago growing lands are distributed in low-lying swamps of the basin of river. The soils of these swamps cinsist of hydraquents, fluvaquents, and a part of histsols which are more or less the poor-drained alluvial soils. The ground water level changes seasonally, ranging from 1-2 meters deep from the surface during the minor rainy season to 50-60 cm above ground level with river floodwater during in the main rainy season. Over a distance of 80-90 km along Sepik River, staring from mangtrove forest to the upstream, Chlorine ion content was almost 40 ppm or bleow at all the survey points, which can be regarede as a fresh water area.<BR>There was a large difference in air and ground temperature between the sunny exposed ground and the forest inside. It was shown that crowns of tall sago trees work to supress the temperature rise.
日本熱帯農業学会の論文