The enhanced decorrelation of fluctuations by the combined effects of
the ExB flow (V(E)) shear, the parallel flow (V(parallel-to)) shear, a
nd the magnetic shear is studied in toroidal geometry. A two-point non
linear analysis previously utilized in a cylindrical model [Phys. Flui
ds B 2, 1 (1990)] shows that the reduction of the radial correlation l
ength below its ambient turbulence value (DELTAr0) is characterized by
the ratio between the shearing rate omega(s), and the ambient turbule
nce scattering rate DELTAomega(T). The derived shearing rate is given
by omega(s)2 = (DELTAr0)2[(1/DELTAphi2){(partial derivative/partial de
rivative r)(qV(E)/r)}2 +(1/DELTAeta2){(partial derivative/partial deri
vative r)(V(parallel-to)/qR)}2], where DELTAphi and DELTAeta are the c
orrelation angles of the ambient turbulence along the toroidal and par
allel directions. This result deviates significantly from the cylindri
cal result for high magnetic shear or for ballooning-like fluctuations
. For suppression of flute-like fluctuations, only the radial shear of
qV(E)/r contributes, and the radial shear of V(parallel-to)/qR is irr
elevant regardless of the plasma rotation direction.