Abstract
The vegetation cover rate of a greening-type block revetment in a steep installation depends on the block shape. We evaluated the greening performance of several greening type block revetments set up in the same river during 8 years. The block revetments are classifiable as gap type, pot type, or box type, with average opening areas of 0.06，0.07，and 0.25 m2/m2, respectively, and average respective planted base soil volumes of 0.29，0.13，and 0.33 m3/m2 each. The pot type average vegetation cover ratio was low: 24 %. In September, plants grew sufficiently except the pot type is unsuitable for greening. The box type with a large opening had a high vegetation cover rate as 70 %, with arbors invading into each box type division. Therefore, the box type accommodated the invasion of arbors. River management taking advantage of arbors was expected. The gap type showed a difference in the vegetation rate in the adjoining division: 41 % on average. Regarding the herbs, alien species accounted for most. The need for measures to push forward greening because of the native species was suggested.
