| General Information: |
| Title: | Anion (NO3-, Cl-, SO42-) concetrations in 18 Japanese forest rivers in 2000-2001 |
| Identifier: | JaLTER-Hokkaido-Kita.1434.2 |
| Abstract: |
We measured nitrate (NO3-), chloride (Cl-) and sulfate (SO42-) ions concentrations from July 2000 to June 2001 in streams in 18 experimental forests located throughout the Japanese archipelago and belonging to the Japanese Union of University Forests. Higher nitrate concentrations in stream water were present in central Japan, an area that receives high rates of atmospheric N deposition. See details in a following paper.
Shibata, H., Kuraji, K., Toda, H. and Sasa, K. (2001) Regional comparison of nitrogen export to Japanese forest streams. TheScientificWorld 1: 572-580. DOI 10.1100/tsw.2001.371
Available at https://www.hindawi.com/journals/tswj/2001/947580/
We are grateful to Prof. T. Okano (Kyushu University, Japan), Prof. M. Nakata (Niigata University, Japan), Prof. K. Uchida and Prof. T. Ohtsuki (Tsukuba University, Japan), Prof. N. Tanaka (The University of Tokyo, Japan), Prof. N. Katagiri and Prof. T. Yamashita (Shimane University, Japan), Prof. A. Nakanishi and Prof. T. Nakashima (Kyoto University, Japan), Mr. S. Kohno (Ehime University, Japan), Prof. J. Tsukamoto (Kouchi University, Japan), Prof. K. Nogami and Prof. M. Takagi (Miyazaki University, Japan), and Prof. Y. Inokura (Kagoshima University, Japan). We are also grateful to Ms. Megumi Ozawa, Mr. Taku Hashiba, and Ms. Satomi Takaya (Hokkaido University) for their assistance in sample collection and analysis of stream water and for sharing data. We would also like to thank the technicians who conducted the joint monitoring programs in this study.
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| Keywords: |
- river water quality
- streamwater quality
- forest watershed
- nitrogen cycling
- nitrate
- nitrogen saturation
- ion concentration
- university forests
- regional comparison
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Involved Parties
| Data Set Owners: |
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Individual: | Hideaki Shibata |
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Organization: | Hokkaido University |
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Position: | Professor |
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Email Address:
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| Data Set Contacts: |
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Individual: | Hideaki Shibata |
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Organization: | Hokkaido University |
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Position: | Professor |
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Email Address:
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| Associated Parties: |
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Organization: | Japanese Union of University Forests
(ja)
全国大学演習林協議会 |
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Data Set Characteristics
| Geographic Region: |
| Geographic Description: | Location of 18 studied sites |
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Bounding Coordinates:
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| West: | 130.77 degrees
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| East: | 143.52 degrees
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| North: | 44.35 degrees
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| South: | 31.53 degrees
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Mimimum Altitude: | 220.0 meter |
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Maximum Altitude: | 2167.0 meter |
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Sampling, Processing and Quality Control Methods
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Step by Step Procedures
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| Step 1: |
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Description:
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Study sites
Eighteen watersheds located throughout the Japanese archipelago
were studied . The basin area, annual precipitation, and annual mean temperature in each watershed ranged from 0.008 to 4.8 km2, from 770 to 3010 mm year-1, and from 2.5 to 16oC, respectively. Bedrock underlying the watersheds includes sandstone, slate, biotite, granite, diorite, shale, andesite, tuff breccia, mudstone, quartzite, granodiorite porphyry, deposited pumice, chert, and tuff. Five of the watersheds contain plantations of Japanese cedar (Criptomeria japonica) and Hinoki cypress (Chamaecyparis obtusa), which are common species for commercial wood in Japan. Nine of the watersheds are covered by natural forests of deciduous broad-leaved, evergreen broadleaved, and coniferous evergreen species. Some of the “natural” forests were second-growth forests. Seven of the watersheds (HKM3, NG-SR, NK-SR, TB-KH, TK-DS, TK-FA, and MY-7N) are gauged to measure the stream discharge, although the annual runoff during the studied period was not available in most sites due
to data limitation.
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Citation:
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| Title: | Regional comparison of nitrogen export to Japanese forest streams |
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Author(s): |
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Individual: | Hideaki Shibata |
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Organization: | Hokkaido University |
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Author(s): |
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Individual: | Koichiro Kuraji |
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Organization: | The University of Tokyo |
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Author(s): |
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Individual: | Hiroto Toda |
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Organization: | Tokyo University of Agriculture and Technology |
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Author(s): |
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Individual: | Kaichiro Sasa |
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Organization: | Hokkaido University |
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Publication Date: | 2001 |
| ARTICLE: |
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Journal: | TheScientificWorld |
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Volume: | 1 |
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Issue: | S2 |
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Page Range: | 572-580 |
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| Step 2: |
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Description:
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Sampling and chamical analysis
Stream water was collected at the outlet of each watershed every other month during the base flow period from July 2000 to June 2001. Some streams were sampled during extended high flow periods, especially during the early spring when snowmelt occurs
in northern Japan (HK-M3 and KS-KW). At KS-KW, stream water was collected monthly. Water was collected in polyethylene bottles that were washed with ultrapure water before sampling. The sampled water was immediately transported to the laboratory of the Northern Forestry Research and Development Office, Field Science Center for Northern Biosphere, Hokkaido University. The temperature of the samples was kept below 4 oC during transportation. In the laboratory, each sample was filtered using a GF/F filter that had been heated in advance for 3 h at 450 oC. Nitrate, chrolide and sulfate ions concentrations in the stream water were measured by ion chromatography (Dionex Co. Ltd, DX-500) after filtering through a membrane filter (pore size: 0.2 μm). All samples collected every other month were analyzed by the same analyzer using the same analytical protocol in order to eliminate possible errors due to different analytical processes used in the laboratories.
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Instrument(s):
| Ion chromatography (Dionex Co. Ltd, DX-500) |
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Data Set Usage Rights
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