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This review is intended to introduce an outline of the results of community metabolism studies on various forest ecosystems of the Western Pacific area made by Japanese investigators in these past ten years. In 1955,SATOO opened this line of research by publishing his first report(65)on the productivity of artificial plantations in this country. A few years later, in 1957 and 1958,four groups of ecologists and forest scientists including ourselves began almost simultaneously to follow him, and the fields of study were expanded to include various types of natural and artificial vegetation ranging from subarctic conifer forests of Hokkaido to the tropical jungle of Southeast Asia. Since that time, more than one hundred stands belonging to some forty different forest types have been investigated, of course mostly within Japan Proper, but also in the Ryukyus(40), Thailand(21,22,24,42,44-47,93,100)and Cambodia(23). Steady progress has been made in the methodology for analysing the metabolism of forest community. These studies were, therefore, not always based on one and the same method, making it difficult to compare the results obtained by different authors. Thus the contents of this review are more or less tentative ; yet we hope, this may well be a useful starting point for more advanced studies to be made under the framework of the International Biological Programme.