TITLE:
Effects of Bare-Ground Revegetation Techniques Using Imperata cylindrica on Changes in the Plant Cover and Species Richness during Early Succession
AUTHORS:
Susumu Yamada, Masayuki Nemoto
KEYWORDS:
Restoration, Riverdike, Sod, Sowing, Transplanting
JOURNAL NAME:
Open Journal of Ecology,
Vol.6 No.8,
July
21,
2016
ABSTRACT: Riverdikes
are habitats that must be revegetated quickly in order to prevent soil erosion.
With increasing pressure to improve the cost efficiency of management, new
revegetation techniques suitable under reduced mowing frequencies are required. Imperata cylindrica (L.) P. Beauv. is
an important component of grasslands in several Asian countries. Its vigorous
rhizome elongation should be useful for quickly covering bare ground. We tested
the effects of sowing (at two densities), transplanting, and sodding of I. cylindrica on plant cover and species richness of established vegetation
over 3 years. The sodding and high-density sowing treatments achieved the most
rapid increase in cover, followed by low-density sowing, transplanting, and the
control. By year 2, however, the cover in the low- and high-density sowing
treatments was similar. The sodding treatment had significantly fewer species
than the other treatments in year 1. Between years 1 and 2 and years 2 and 3,
the total number of species increased in the transplanting treatment, whereas
it decreased in the sodding and two sowing treatments. Accordingly, if
stabilization and erosion control are the priority, introduction of I. cylindrica using sod and high-density sowing is the most suitable method.
If immediate green-up is not imperative, low-density sowing is likely to
provide available resources for new seedlings of diverse species to become
established, allowing the introduction of representative species in
semi-natural grasslands. More research will be needed on the effects of
introducing diverse species (e.g., sowing seed mixtures) that include I. cylindrica on the resulting floristic composition.