Year: 1993
Type: article
Abstract: A field survey was made of the annual biomass changes of Trapa natans L., a floating-leaved plant, from 1985 to 1986 in a natural stand in Takahamairi Bay of Lake Kasumigaura, Japan.Aerial photographic surveys were done from 1985 to 1990.In addition to the photographs, vegetation maps from 1972 to 1990 were made, based on photographs of 1972, 1976, 1980, 1984.A violent wind during a typhoon in late August 1985 caused a subsequent decrease in the stand of Trapa natans whose maximum biomass was 340 g dry weight m-2 before the typhoon.The stand recovered in 1986 from buried seed and seed generated before the typhoon.Because the plant floats at the end of a long stem, the sudden rise in water level (100 cm) after the typhoon in August 1986 did not cause a subsequent decrease in the stand of Trapa natans wherever strong water current were absent.The violence of winds and water currents during the growing period are important factors in determining the survival of Trapa natans in Lake Kasumigaura.Due to buried seeds and long stem length, the stands of Trapa natans survive in spite of frequent disturbances.
Author: Seiichi NOHARA
Institution: National Institute for Environmental Studies
Language: English
Subfield: Environmental Chemistry
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2316508482