Stream water chemistry of university forests over

H. Toda; K. Sasa; F. Sato; H. Shibata; M. Nomura; K. Ichikawa; E. Fujito; T. Takanishi; K. Seiwa; H. Tsukahara; T. Iida; N. Taniguchi; M. Nakata; S. Kuwabara; T. Uchida; Y. Haruta; M. Inoue; H. Yagi; T. Tsukagoshi; K. Kuraji; M. Futada; H. Ono; M. Suzuki; Y. Imaizumi; N. Yamaguchi; C. Takenaka; Y. Yurugi; S. Kawanabe; M. Ando; A. Nakanishi; K. Nishimura; M. Yamasaki; Y. Nagayama; N. Doi; S. Katagiri; R. Kofuji; Y. Shinmura; S. Inoue; T. Ezaki; S. Kohno; M. Fujihisa; I. Iwamatsu; K. Imayasu; S. Nakamura; J. Tsukamoto; K. Nogami; T. Enoki

doi:10.11519/jjfs1953.82.3_308

H. Toda, K. Sasa, F. Sato, H. Shibata, M. Nomura, K. Ichikawa, E. Fujito, T. Takanishi, K. Seiwa, H. Tsukahara, T. Iida, N. Taniguchi, M. Nakata, S. Kuwabara, T. Uchida, Y. Haruta, M. Inoue, H. Yagi, T. Tsukagoshi, K. Kuraji, M. Futada, H. Ono, M. Suzuki, Y. Imaizumi, N. Yamaguchi, C. Takenaka, Y. Yurugi, S. Kawanabe, M. Ando, A. Nakanishi, K. Nishimura, M. Yamasaki, Y. Nagayama, N. Doi, S. Katagiri, R. Kofuji, Y. Shinmura, S. Inoue, T. Ezaki, S. Kohno, M. Fujihisa, I. Iwamatsu, K. Imayasu, S. Nakamura, J. Tsukamoto, K. Nogami, T. Enoki

Author information

H. Toda
Faculty of Agriculture, Tokyo University of Agriculture and Technology
K. Sasa
Hokkaido Univ. For.
F. Sato
Hokkaido Univ. For.
H. Shibata
Hokkaido Univ. For.
M. Nomura
Hokkaido Univ. For.
K. Ichikawa
Hokkaido Univ. For.
E. Fujito
Hokkaido Univ. For.
T. Takanishi
Hokkaido Univ. For.
K. Seiwa
Grad. Sch. of Agric., Tohoku Univ.
H. Tsukahara
Fac. of Agric., Yamagata Univ.
T. Iida
Fac. of Agric., Yamagata Univ.
N. Taniguchi
Fac. of Agric., Niigata Univ.
M. Nakata
Fac. of Agric., Niigata Univ.
S. Kuwabara
Faculty of Agriculture, Tokyo University of Agriculture and Technology
T. Uchida
Faculty of Agriculture, Tokyo University of Agriculture and Technology
Y. Haruta
The Tokyo Univ. For.
M. Inoue
The Tokyo Univ. For.
H. Yagi
The Tokyo Univ. For.
T. Tsukagoshi
The Tokyo Univ. For.
K. Kuraji
Interdiscipl. Grad. Sch. Sci. Eng., Tokyo Inst. Tech.
M. Futada
Agric. and Forestry Res. Ctr. Univ. of Tsukuba
H. Ono
Fac. of Agric., Shinshu Univ.
M. Suzuki
Tech. Off., Sch. of Agric. Sci., Grad. Sch. of Bioagr. Sci., Nagoya Univ.
Y. Imaizumi
Tech. Off., Sch. of Agric. Sci., Grad. Sch. of Bioagr. Sci., Nagoya Univ.
N. Yamaguchi
Tech. Off., Sch. of Agric. Sci., Grad. Sch. of Bioagr. Sci., Nagoya Univ.
C. Takenaka
Grad. Sch. of Bioagr. Sci., NagoyaUniv.
Y. Yurugi
Mie Univ. For.
S. Kawanabe
Grad. Sch. of Agric., Kyoto Univ.
M. Ando
Kyoto Univ. For.
A. Nakanishi
Kyoto Univ. For.
K. Nishimura
Kyoto Univ. For.
M. Yamasaki
Kyoto Univ. For.
Y. Nagayama
Life Env. Sci. (LES), Shimane Univ.
N. Doi
Life Env. Sci. (LES), Shimane Univ.
S. Katagiri
Life Env. Sci. (LES), Shimane Univ.
R. Kofuji
Life Env. Sci. (LES), Shimane Univ.
Y. Shinmura
ERCBR, LES, Shimane Univ.
S. Inoue
Coll. of Agric., Ehime Univ.
T. Ezaki
Ehime Univ. For.
S. Kohno
Ehime Univ. For.
M. Fujihisa
Ehime Univ. For.
I. Iwamatsu
Kochi Univ. For.
K. Imayasu
Kochi Univ. For.
S. Nakamura
Kochi Univ. For.
J. Tsukamoto
Kochi Univ. For.
K. Nogami
Miyazaki Univ. For.
T. Enoki
Ryukyus Univ. For.

Keywords: forested watershed, proton, stream water, university forest, water chemistry

JOURNAL FREE ACCESS

2000 Volume 82 Issue 3 Pages 308-312

DOI https://doi.org/10.11519/jjfs1953.82.3_308

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Abstract

Extensive research on forest stream water chemistry gives important information in understanding the effects of environmental changes in forest ecosystems. The chemical properties of stream water from 45 forested watersheds in university forests over Japan were investigated in June, 1998. The average pH was 7.1 (maximum 8.1, minimum 6.1). The average electric conductivity (EC) was 64 (maximum 178, minimum 19) μS/cm. The EC of stream water in Okinawa and Sado Island sites tended to be high because the effects of sea salt. Except for the island sites, EC had a positive correlation with pH, summation of cation and alkalinity (mostly HCO₃^-). This suggests that the water showed a high EC value and a high pH value caused by the consumption of proton (H⁺) in streams where carbonate weathering brings a high cation concentration. The NO₃^- concentration in the Kanto mountainous region sites was high compared with the concentration of other sites. In Gunma sites, the relationships between NO₃^- and Ca2⁺ concentration had a close positive correlation. It was considered that exchangeable Ca2⁺ in the surface soil was discharged due to the increase of H⁺ produced by nitrification.

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