堆積腐植層の形態形成過程研究における新しいアプローチの試み

概要

論文の詳細を見る
The appearance of humus components changes greatly in a narrow space as they are decomposed. Such transformation process can be depicted in detail by observing small amount of the humus profile. In the three study sites, decomposition of litter is slowest in the Beech site and litter accumulates in a characteristic manner. Although the decomposition process is slow, activity of soil animals is well preserved and it is indicated that many soil biota exploit the food and space in the humus profile. At the Oak site, decomposition is relatively fast and soil biological activity is suggested to be high. On the other hand, decomposition of cedar (Cryptomeria japonica) litter is slightly different from those of deciduous leaves due to its leaf shape and it is recognized that the humus profile shows history of forest management. From these observations, decomposition and the formation process of humus form can be depicted in detail with additional information on top of micromorphological method by making thin section; i) identification of animal faeces, ii) evidence of feeding by different soil animals, iii) change in the appearance of litter such as bleaching by whit-rot fungi, vi) evidence of soil biological activities from the shape and/or state of the casts and aggregates. Therefore it can be said that the new approach is valid as a tool in investigation of many processes occurring in the plant-soil interface.
国立科学博物館の論文
2005-12-26