著者

Tatsuto AOKI

出版者

The Association of Japanese Geographers

雑誌

Geographical review of Japan, Series B (ISSN:02896001)

巻号頁・発行日

vol.73, no.2, pp.105-118, 2000-12-01 (Released:2008-12-25)

参考文献数

48

被引用文献数

9 10

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Geomorphological equilibrium line altitude (ELAg), as defined by steady-state equilibrium line altitude estimated based on geomorphological method, has been used to reconstruct Last Glacial palaeoclimate. However, the ELAg is influenced not only by temperature, but also by other factors. This paper discusses factors affecting Last Glacial ELAg in the Kiso mountain range, central Japan. The weathering-rind thickness of gravel was used for dating moraines. The dating results have shown that glaciers advanced at the Last Glacial Maximum and the Younger Dryas stages. The ELAg for each stage was reconstructed based on the Accumulation-Area-Ratio method (AAR=0.6). The results indicate that the ELAg of each reconstructed glacier was affected not only by temperature but also by the altitude of mountain ridges. Although some previous studies have reconstructed palaeoclimate based on the ELAg, the results of the present study cast doubt on such reconstruction. For better reconstruction, the effects of temperature on the ELAg should be separated from those of topographic factors.

著者

Keiji KIMURA Tatsuto AOKI Shigeki SANO Yasuhiro SUZUKI

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.78, no.5, pp.276-288, 2005-04-01 (Released:2008-12-25)

参考文献数

30

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The relationships between successional vegetation change and geomorphic conditions were analyzed by using a high-resolution digital terrain model (DTM) and a time series of converted digital vegetation maps combined within a geographical information system (GIS). The results of the analysis confirmed that the pattern of vegetation change is a function of geomorphic conditions (measured in terms of spatio-statistical values of various parameters and time series of those values). Current geoecological studies are usually carried out by means of detailed field observations with high spatial resolution, and the results of our study suggest that a GIS can easily deal with such data over a large area and long time period. In the study area, unforested sites were reforested using Japanese red pine (Pinus densiflora) as part of the forest rehabilitation work that occurred in the early 1950s. After that, two main patterns of vegetation change from pine forest to deciduous broadleaved forest occurred. In one type, the deciduous broadleaved forest reappeared quickly. In the other, the pine forests remained for a long time. Stands that underwent relatively rapid succession were found on north-facing gentle slopes close to large bodies of water. Stands that did not undergo rapid succession were found on steeper, warmer, and drier slopes (often south-facing slopes farther from bodies of water). The rate of forest succession towards deciduous broadleaved forest is a function of these geomorphic conditions. This suggests that forest succession is influenced by intermediate factors controlling by geomorphic conditions of site, such as soil moisture and soil thickness.

著者

Hiroyuki KOSAKA Atsushi SUZUKI Yoshio SUGIURA Teruko USUI Atsushi SUZUKI Tatsuto AOKI Isao MIZUNO Hitoshi FUKUSAWA Yasunori NAKAYAMA Yoshiki WAKABAYASHI Yugo ONO

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.78, no.12, pp.878-886, 2005-10-01 (Released:2008-12-25)