Faculty Profiles - SUDO Miki

Papers - SUDO Miki

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Long-term fluctuation and regional variation of nutrient loads from the atmosphere to lakes Reviewed

T. Kunimatsu and M. Sudo

Water Science & Technology 53 ( 2 ) 53 - 61 2006.4

Comparison of the Effects of Di(2-ethylhexyl)phthalate, a Peroxisome Proliferator, on the Vitamin Metabolism Involved in the Energy Formation in Rats Fed with a Casein or Gluten Diet Reviewed

Katsumi Shibata, Tsutomu Fukuwatari, Yoriko Iguchi, Yuko Kurata, Miki Sudo, and Ryuzo Sasaki

Biosci. Biothechnol. Biochem 70 ( 6 ) 1331 - 1337 2006.4

水田からの窒素・リン流出負荷の削減 Reviewed

金木亮一，須戸幹，芝原勉

水文・水資源学会誌 19 ( 5 ) 360 - 371 2006.4

Herbicide Discharge from Paddy Fields Located Around Lake Biwa Basin and Factors Affecting Herbicide Losses Reviewed

SUDO Miki, KAWACHI Takeshi

Japan journal of water pollution research 29 ( 11 ) 715 - 721 2006.4

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment

The concentrations and loadings of herbicides were investigated in three paddy field basins (4.7, 4.7 and 9.3 ha) from May to August 2002. The herbicide losses from the basins determined from cumulative load and application amount gathered by the questionnaire method were estimated to be 1.6% and 26% for Bromobutide, 8.9∼27% for Cafenstrol, 0.1% for Dimepiperate, 1.1∼2.0% for Mefenacet, 10.2∼25% for Simetryn, 0.9% and 14% for Thenylchlor, and 0.1∼1.6% for Thiobencarb. One of the important factors attributed to the differences in herbicide loss among the basins was water discharge from the basins. To generalize them, specific herbicide losses were calculated from herbicide losses and the height of daily dry weather flow. The specific herbicide losses suggested that transport with percolated water is the main factor for Cafenstrol and Simetryn losses, although other factors such as interaction with soil and degradation in soil may have also contribute to Bromotutide, Mefenacet, Thenylchlor and Thiobencarb losses from the paddy field basins.

DOI： 10.2965/jswe.29.715

CiNii Books

Other Link： https://jlc.jst.go.jp/DN/JALC/00288086338?from=CiNii

Reduction of Effluent Loads of Nitrogen and Phosphorus from Paddy Fields Reviewed

KANEKI Ryoichi, SUDO Miki, SHIBAHARA Tsutomu

JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 19 ( 5 ) 360 - 371 2006.4

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

Effects of no-puddling culture and reducing fertilizer culture are examined for two years on outflow loads of nitrogen and phosphorus. Four paddy fields are used, these are called "no-puddling and reducing fertilizer division," "puddling and reducing fertilizer division," "no-puddling and conventional fertilizer division" and "puddling and conventional fertilizer division." In the reducing fertilizer divisions, nitrogen is treated into a nursery box, and phosphorus is treated by using a side fertilizer transplanter. In the conventional fertilizer divisions, fertilizer is broadcasted as usual.

DOI： 10.3178/jjshwr.19.360

CiNii Books

Other Link： https://jlc.jst.go.jp/DN/JALC/00284176866?from=CiNii

Long-term fluctuation and regional variation of nutrient loads from the atmosphere to lakes Reviewed

T Kunimatsu, M Sudo

WATER SCIENCE AND TECHNOLOGY 53 ( 2 ) 53 - 61 2006

Language：English Publishing type：Research paper (scientific journal) Publisher：I W A PUBLISHING

The atmospheric depositions were collected by ordinary bulk-samplers mounted with a glass or polyethylene funnel of 30cm orifice. A long-term observation was carried out at a site (35 degrees 01'30"N, 135 degrees 58'07"E) in the urbanized area for 21 years since 1974. The annual volume-weighted average concentrations of total nitrogen (TN) and phosphorus (TP) were 1.02 +/- 0.30 and 0.031 +/- 0.015 mg1(-1), respectively, and the loading rates were 14.5 +/- 2.8 and 0.43 +/- 0.16 kg ha(-1) yr(-1). The rates neither had a relationship with the precipitation (1,492 343 mm yr(-1)) nor showed any diachronic tendencies. In order to obtain the loading rate of TN and TP within 10% uncertainty under the significant level of 0.01, there is no way but to continue the observation for seven and eleven years or more, respectively. In order to clarify the regional variation of the loading amounts of the depositions, the samplers were set at 12 sites distributing throughout the Kinki District for two years. The distance from northernmost (2322 mm yr(-1)) to southernmost (11242 mm yr(-1)) is about 150 km. The average loading rates of the 12 sites were 16.2 +/- 2.5 kg ha(-1) yr(-1) of TN and 0.730 +/- 0.247 kg ha(-1)yr(-1) of TP. The depositions of NO3-N, NH4-N, and TN as well as TP showed tendencies with distances neither from a big city nor from Japan Sea.

DOI： 10.2166/wst.2006.038

Web of Science

Decrease in herbicide concentrations and affected factors in lagoons located around Lake Biwa Reviewed

M Sudo, M Nishino, T Okubo

WATER SCIENCE AND TECHNOLOGY 53 ( 2 ) 131 - 138 2006

Language：English Publishing type：Research paper (scientific journal) Publisher：I W A PUBLISHING

The contamination levels and changes in the concentrations in four lagoons around Lake Biwa of paddy-use herbicide were studied. Four lagoons, Sone-numa (52 days of HIRT (hydraulic residence time) estimated from the lagoon volume and the average discharge at the outlet, 21 ha area), Yanagihira-ko (40 days, 5.0 ha), Noda-numa (11 days, 6.0 ha), and lba-naiko (2 days, 55.5 ha), were selected as monitoring sites. Intensive water sampling was carried out once a week from May to June at the outlet of each lagoon. Although twelve of the monitored herbicides were detected, the maximum concentrations did not exceed the guidelines for water-supply law in Japan. The relation between half-lives in herbicide concentrations and characteristics of a lagoon such as HRT and chlorophyll-a concentrations were examined. The shorter half-lives of herbicide concentrations in lagoons with shorter HRT means that replacement by influent water effectively decreased the pesticide concentrations. Shorter half-lives in lagoons with high chlorophyll-a concentrations between the lagoons with similar HIRT suggest that biological degradation during the residence time worked more efficiently in the lagoon with high chlorophyll-a concentrations.

DOI： 10.2166/wst.2006.046

Web of Science

Paddy herbicide inputs in the entire river inflow reaching Lake Biwa, Japan Reviewed

Miki Sudo, Takuya Okubo, Ryoichi Kaneki

Limnology 6 ( 2 ) 91 - 99 2005.8

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Limnology

This study estimated the inputs of four paddy herbicides in the entire river inflow reaching Lake Biwa, the largest lake in Japan, which serves as a water resource for 14 million people. The Uso River and the Hino River, the main contaminated rivers among the inflow rivers, were selected as daily and hourly monitoring sites to provide data on the seasonal trends in the concentration and load of herbicides and to determine the effect of rainfall events on load. The monitoring was also performed four times in 15 inflow rivers. The total input to the lake was calculated from the loads during fine weather conditions and additional loads during rainfall events. The former based on the lumped load from the two rivers and by prorating for the 15 rivers, and the latter was estimated from the relation between precipitation and increased load rate. The annual losses of herbicide from the basin to Lake Biwa were estimated to be 14.5% for bromobutide, 3.0% for pretilachlor, 5.2% for molinate, and 8.8% for simetryn. The loads caused by rainfall events accounted for 9%-18% of the total annual loads. © The Japanese Society of Limnology 2005.

DOI： 10.1007/s10201-005-0145-x

Scopus

Paddy-herbicide inputs in the entire river inflow reaching Lake Biwa (Japan) Reviewed

Miki Sudo, Takuya Okubo and Ryoichi Kaneki

Limnology 6 ( 2 ) 91 - 99 2005.4

琵琶湖とその流域における農薬の動態

須戸幹

混相流 21 ( 2 ) 160 - 167 2005.4

大きな湖：琵琶湖と小さな湖：周辺内湖における農薬の挙動と解析

須戸幹

農薬環境科学研究 15 ( － ) 19 - 26 2005.4

琵琶湖とその流域における農薬の動態

須戸幹

混相流 21 ( 2 ) 160 - 167 2005.4

大きな湖：琵琶湖と小さな湖：周辺内湖における農薬の挙動と解析

須戸幹

農薬環境科学研究 15 ( - ) 19 - 26 2005.4

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