森林立地学会誌 森林立地42（1），2000，29～35
Jpn.J.For.Environment42（1），29-35 2000
Methodological studies of Cryptomeria japonica D. Don root
sampling and
measurement techniques for
simultaneous analysis of root and arbuscular
mycorrhiza dynamics
Takeo Mizoguchi＊
Forestry and Forest Products Research Institute,
Inashiki, Ibaraki 305, Japan.＊
In order to modify of regular root sampling and
sorting techniques for simultaneous analysis of root and arbuscular mycorrhiza
dynamics, three kinds of root sampling were conducted in several Japanese cedar
(Cryptomeria japonica D. Don) stands
from 1988 to l992. The results of root mass analysis indicated that, compared
to other tree species, great sampling variation in Japanese cedar posed the
most serious problem to detecting subtle fluctuations in active root tips that
are capable of forming mycorrhiza. In place of direct root mass comparison,
several indices calculated from root parameters (e.g., number of living root tips per gram of living fine roots) can
be applied to reduce the influence of sample variation.