Relationship between Decline of Cryptmeria and Soil Acidity in Kanto Plain

Abstract

This paper is concerend with the relationsip between decline of Cryptmeriae (Cryptmeria japonica) and soil acidity in kanto plain.
The results of this study are as follows;
1) PH are lower and values of exchange aluminium (Ex-Al) are less at the soil of the root or the heavy declining grade direction.
2) E/R value of fine roots increases in proportion to E/R value of Ex-Al.
3) E/R rate of fine roots is higher at the heavy declining grade of Cryptmeria. For results mentioned above, it is expectable and prisipitation caught at the crown fllows down along the main shoot of Cryptmeria and soil acidity affects decline of the grow of the tree.