Harukuni Tachibana
Hokkaido University
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Featured researches published by Harukuni Tachibana.
Archives of Agronomy and Soil Science | 2007
Rofiq Iqbal; Harukuni Tachibana
Abstract The changes in water chemistry regime and their effect on the composition of the vegetation were studied in Sarobetsu Mire, northern Hokkaido, Japan, an exotic plant-invaded bog. Water chemistry and plant species data were collected along the invasion stage which depicts the degradation gradient. Analysis of Variance (ANOVA) was conducted to assess the source of the variances in water chemistry and Canonical Correspondence Analysis (CCA) was then used to relate vegetation gradients to environmental factors. The water chemistry regimes between the natural and degraded area were found to be significantly different. They were found to change gradually from ombrotrophic to minerotrophic state along the invasion pattern. Sampling points (i.e. locations along the degradation gradient) accounted for most of the variation in water chemistry. It accounted for 30 – 80% of the total variation in pH, EC, NH4 +, DN, Na+, K+, Ca2+, Mg2+, alkalinity 4.3Bx, Si and Dissolved Organic Carbon. CCA ordination also revealed that besides hydrological parameters, nutrient contents, acidity-alkalinity gradient and base cation content (excluding K+) were also closely related to the composition of the vegetation. The results highlight the influence of hydrological parameters on water chemistry regime; they control the chemical as well as biotic processes in mire ecosystems.
Water Science and Technology | 2001
Harukuni Tachibana; K. Yamamoto; K. Yoshizawa; Yasumoto Magara
Water Science and Technology | 2006
Rofiq Iqbal; Saori Akimoto; K. Tokutake; Takashi Inoue; Harukuni Tachibana
Journal of global environment engineering | 2001
Hiroshi Kobayashi; Sachio Ohta; Naoto Murao; Harukuni Tachibana; Sadamu Yamagata
Tropics | 2006
Harukuni Tachibana; Rofiq Iqbal; Saori Akimoto; Mutsuko Kobayashi; Syunji Kanie; Akio Mori; Tadaoki Itakura; Hidenori Takahashi; Kohken Utosawa; Nyoman Sumawijaya; Salampak Dohong; Untung Darung; Suwido H. Limin
Doboku Gakkai Ronbunshu | 2005
Rofiq Iqbal; Stefan Hotes; Harukuni Tachibana
Journal of Japan Society on Water Environment | 2002
Ken-ichi Tatsumi; Takeyoshi Nakanowatari; Takahiro Narita; Yasumoto Magara; Harukuni Tachibana
Journal of Japan Society of Hydrology & Water Resources | 1996
Harukuni Tachibana; Tatsuo Shimizu; Yoshihisa Nakagawa
Journal of Japan Society on Water Environment | 2005
Ken-ichi Tatsumi; Kazuo Jin; Yasumoto Magara; Harukuni Tachibana
Japanese Journal of Limnology (rikusuigaku Zasshi) | 1996
Harukuni Tachibana; Takanobu Inoue