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陸生スゲ類₂種の緑化試験地造成と初期生育（予報）

63

Establishing experimental revegetation plots using two terrestrial sedge species and

monitoring their early growth after planting

Teruo ARASE＊ and Taizo UCHIDA＊＊

＊＊

Faculty of Agriculture, Shinshu University

Faculty of Architecture and Urban Engineering, Kyushu Sangyo University, 813-8503 Fukuoka City

Summary

To assist with the revegetation of excavated slopes, we established experimental revegetation sites

using Carex oxyandra and C. satsumensis, two species of terrestrial sedges (Cyperaceae) that typically

colonize gravelly and disturbed areas such as landslides. The experimental design comprised a randomized

block design with a two-way layout; 2 species × 2 soil types (black-colored soil and weathered granite) × 2

replicates. The plot size was set to 1.5×0.9 m. Rootstocks of the sedges were collected and 15 rootstocks

per plot (1 to 3 tillers per rootstock) were transplanted at the end of May 2019. The experiment was started

on 1 June 2019. Plant height and number of tillers per rootstock were measured at one-month intervals. In

addition, leaf size (leaf length and leaf width) was measured in October (4 months after planting) in each

plot and the natural habitats from which the transplanted rootstocks were originally obtained. Colonization

by the sedge two species was not observed at 6 months after planting. However, based on the increase in

the number of tillers and changes in leaf size, C. oxyandra showed superior growth on black-colored soil,

while C. satsumensis grew better on weathered granite; however, both species could grow on both soil

types. Both species showed poor growth in the plot under shaded conditions. While the number of tillers

increased in autumn in both species, it was not possible to determine whether this was normal seasonal

growth, or delayed growth caused by the stress associated with transplantation. Consequently, additional

surveys of the experimental sites are needed in future. Further, revegetation experiments using seeding

(without transplanting) should also be undertaken.

Key Words: Carex oxyandra, Carex satzumensis, Revegetation of excavated slopes, weathered granite,

black-colored soil

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