Detail of Grant Awarded Academic Researches
Development of a method to recover kawara nogiku and gravel bar ecosystems, making full use of the characteristics of the river environment
(at that time)
|Professor, Department of Agriculture, Meiji University|
The decline of gravel bars has been observed on many rivers, and the gravel bars are being transformed into forests and large perennial prairies. On the Tama River, gravel bars were commonly observed until the 1960s, from Hamura in the middle region to Mizonokuchi. The gravel bar ecosystem is characterized by pioneer plants such as kawara nogiku (Aster kantoensis Kitam) and kawara nigana (Ixeris tamagawaensis) and plants that appear later in the transition such as Artemisia capillaris and kawara saiko (Potentilla chinensis). The ecosystem is also characterized by the kawarabatta (Eusphingonotus japonicus) and Teleogryllus yezoemma var. kawara insects and the long-billed plover and the little tern birds. In the 2010s, the kawara nogiku planted in the dry river bed escaped to the surroundings and has been seen becoming semi-wild in multiple places. Clarification of the dynamics of the meta population, including the escaped population, would contribute to the recovery of not only kawara nogiku but also the gravel bar ecosystem. In addition, since recovery of gravel bars is being performed in the Kinu River, Sagami River, and Tenryu River, simple surveys will be performed there and the results will be compared to the Tama River case. The purpose of this research is to clarify a method to recover the gravel bar ecosystem characteristic of the middle region of the Tama River and kawara nogiku, the symbol of the gravel bar ecosystem.
|Full Text||Download (Japanese Only)|