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関山 絢子 (セキヤマ アヤコ) SEKIYAMA Ayako 教授 |
学内職務経歴 【 表示 ／ 非表示 】
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東京農業大学 地域環境科学部 生産環境工学科 教授
2024年04月 - 現在
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東京農業大学 地域環境科学部 生産環境工学科 助教
2014年04月 - 2016年09月
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東京農業大学 地域環境科学部 生産環境工学科 准教授
2016年10月 - 2024年03月
学外略歴 【 表示 ／ 非表示 】
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東京大学生産技術研究所 人間・社会系部門 竹内研究室 特任助教
2012年04月 - 2014年03月
国名：日本国
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東京情報大学 総合情報科学部 助教
2010年04月 - 2012年03月
国名：日本国
所属学協会 【 表示 ／ 非表示 】
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日本沙漠学会
2013年04月 - 現在
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日本写真測量学会
2010年04月 - 現在
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日本リモートセンシング学会
2010年04月 - 現在
論文 【 表示 ／ 非表示 】
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Assessment of Agricultural Land-use/ Land-cover Change in the Diamphwe River Basin using Sentinel-2 Imageries
LUWEYA KENFORD A. B., ZHANG KE, FIWA LAMECK, MASKEY SARVESH, SEKIYAMA AYAKO, OKAZAWA HIROMU
International Journal of Environmental and Rural Development 16 ( 2 ) 149 - 156 2025年
記述言語：英語 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Land use and land cover (LU/LC) classification is an important aspect of research in various sectors of society. With technological advancements, LU/LC classification is a catalyst to achieve set goals, including the Malawi 2063 agenda. Diamphwe Basin, with over 90% farmers, is in central Malawi on vastly flat land, with a lot of potential in both commercial and subsistence agriculture production. Using the September 2017 and 2022 Sentinel-2 images, supervised classification and change detection were performed to track LU/LC changes using the maximum likelihood algorithm. The classes used for this classification were dense vegetation, wetland vegetation, agricultural land, settlement land, and bare land. The results showed that dense vegetation land increased by 10%, mostly converted from wetlands in forest reserves, and agricultural land decreased by 15.5%, of which a large proportion was converted to settlement land, thus increasing settlement land (urbanization) by 11.7%. The increased dense forest is expected to have a cooling effect and can increase baseflow to river discharge, whereas decreased agricultural land is expected to have a heating effect on the land mass. However, owing to the proximity to agricultural land, people in the basin experience more heating effects than cooling effects. Urbanization can create a ready market and can be leveraged to increase agricultural production through irrigation in the basin, as seen in the case of the Ganges River Basin. An increase in dense forest area could lead to an increase in river discharge owing to an increase in basin storage in the form of a baseflow increase. Since almost all human developments occur on land, LU/LC change detection is the key to policymakers and other stakeholders in achieving the three pillars of the Malawi 2063 agenda, thus agricultural development, industrialization, and urbanization by keeping abreast of the changes on the land.</p>
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Plant Growth and Fruit Quality of Tomato (<i>Solanum lycopersicum</i>) Using Advanced Treated Water in Hydroponics
FUENTES ANTONIO PEREZ, WAKASUGI KAZUHA, MASKEY SARVESH, MAZIBUKO DICKSON M., NAKAMURA TAKAHIKO, OSHIMA HIROYUKI, KATO TAKU, SEKIYAMA AYAKO, OKAZAWA HIROMU
International Journal of Environmental and Rural Development 15 ( 2 ) 123 - 128 2024年
記述言語：英語 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Biologically Treated Water (BTW) and Chlorinated Disinfected Water (CDW) are byproducts of wastewater treatment. Both BTW and CDW contain significant amounts of nutrients that can be used in agricultural systems. Although the use of BTW has been investigated relative to nutrient recovery, filtering treatment, and social and economic development, more research is required to determine the applicability of using CDW and BTW in hydroponic systems. This study evaluated the growth and quality of Cindy Sweet tomatoes irrigated by BTW and CDW and demonstrated the effectiveness of low application of fertilizer in hydroponic systems. The results demonstrated that tomato plants irrigated with CDW tend to have higher fresh-weight than those irrigated with BTW. Statistical analysis of fruit quality showed that the fruits of plants grown in BTW were larger in diameter and weight, but further t-test analysis showed no significant differences between water types. This study also discovered that hydroponic irrigation with BTW and CDW resulted in larger fruit clusters without a corresponding increase in fruit density. The Index for Relative Chlorophyll content (IRC) showed no difference between BTW and CDW. In contrast, despite presenting lower levels of pH, the control performed best with twice the chlorophyll content in terms of IRC. These results show that even with low IRC of plants from BTW and CDW, there were no differences in fruit size and weight among the treatments. The study also suggests that plants irrigated with CDW have higher biomass accumulation, which can be useful for comparing yields in leafy vegetables.</p>
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Effects of LED Lighting and Media on Vitamin C and Phenol Content in Ethiopian Kale (<i>Brassica carinata</i>) Microgreens
MARU RUTH, WESONGA JOHN, MAZIBUKO DICKSON, AKIYAMA SATOKO, SEKIYAMA AYAKO, KAWAKAMI SHOTARO, MASKEY SARVESH, KAVOO AGNES, NEONDO JOHNSTONE, OKAZAWA HIROMU
International Journal of Environmental and Rural Development 15 ( 2 ) 151 - 156 2024年
記述言語：英語 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Microgreens are innovative vegetable products related to their novelty and health-promoting benefits. However, growth media and light conditions affect microgreens’ nutritional content, which may limit their production in rural community settings. <i>Brassica carinata</i> is an essential local Kenyan vegetable, but its production and full utilization are limited by its early maturity. The potential of using <i>B. carinata</i> as a microgreen would be an excellent alternative production technique to minimize its early maturity limitation. This study investigated the influence of white and blue light on Vitamin C and phenol content in <i>B. carinata</i> microgreens grown using sand and cocopeat. <i>B. carinata</i> microgreens were grown for 14 days in a growth chamber using plastic punnet containers filled with cocopeat and sand under white and blue light. The capillary wick watering technique was used for irrigation. Temperature and relative humidity were monitored and maintained at 26°C± 2, and 60%, respectively. The photoperiod and intensity of light were also maintained at 12 hr and 160 ± 2.5 µmol m<sup>−2</sup>s<sup>−1</sup>) respectively. After 14 days, microgreens were harvested and freeze-dried to analyze Vitamin C and phenol content. And. Data was subjected to ANOVA and was separated by Tukey’s multiple comparison test. Results indicated that light had no significant effect on <i>B. carinata</i> microgreens phenol content. However, microgreens grown in locally available sand showed statistically higher amounts of phenol content than those grown using cocopeat. For vitamin C content, media and light had no significant effect. Our results show that sand medium can be used equally to produce microgreens with higher phenol content for <i>Brassica carinata.</i></p>
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Crop Growth Model for Hydroponic Cultivation of <i>Solanum lycopersicum </i>(Tomato) in a Semi-automated System
PEREZ-FUENTES ANTONIO, MASKEY SARVESH, MAZIBUKO DICKSON M., OKAZAWA HIROMU, NAKAMURA TAKAHIKO, SEKIYAMA AYAKO
International Journal of Environmental and Rural Development 15 ( 1 ) 35 - 40 2024年
記述言語：英語 出版者・発行元：Institute of Environmental Rehabilitation and Conservation, Research Center
<p>Hydroponics can be integrated into Controlled Environment Agriculture (CEA), in combination with greenhouses. They can successfully optimize the use of fertilizers and water for arid zones. Elevated costs of this type of agriculture lead farmers to implement semiautomated systems and use recyclable materials to stabilize plant productivity. This paper discusses the different growth ratios of tomato plants estimated with logistic curves when tap water with fertilizer (T1), Oxidixed Water-OW [reclaimed water] (T2), and Disinfected Tertiary Recycled Water- DTRW [renewable water] (T3) are used; additionally, a new module is presented to avoid underestimation of plant height when fertilization is carried out at the flowering stage. This model was adapted only for treatment 1. Logistic curves were created with low RMSE values using the least-square method. Despite presenting better mass volume and fruit quantity in OW [reclaimed water] treatment at the final stage of the plant, a t-test revealed that there is not a significant difference among treatments of OW and DTRW [renewable and reclaimed water] for the height of plants. The adjustment of a logistic equation with the inclusion of a linear module allowed to decrease in the RMSE from 73 to 21 mm.</p>
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Applicability of Farmlands Detection in Djibouti from Satellite Imagery using Deep Learning 査読あり
Takumi SATO, Ayako Sekiyama*, Syuhei SAITO and Sawahiko SHIMADA
Journal of Arid Land Studies 32 ( S ) 181 - 185 2022年12月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
書籍等出版物 【 表示 ／ 非表示 】
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生物科学系・農学系のための情報処理2022
東京農業大学情報教育センター（ 担当： 共著）
東京農業大学情報教育センター 2022年03月
記述言語：日本語 著書種別：教科書・概説・概論
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沙漠学事典
日本沙漠学会（ 担当： 分担執筆）
丸善株式会社 2020年07月
記述言語：日本語 著書種別：学術書
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はかる つくる えがく・そだてる みどりの地域を育む～地域環境科学がわかる本
東京農業大学地域環境科学部教員一同（ 担当： 共著）
東京農業大学出版会 2015年07月 （ ISBN:4-88694-450-4 ）
記述言語：日本語 著書種別：学術書
MISC 【 表示 ／ 非表示 】
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Tea Plantation Monitoring using UAV in Shizuoka, Japan 査読あり
SHIMADA S, SATO K, SEKIYAMA A and FUJIKAWA T
Esri Map Book 33 2018年07月
記述言語：英語 掲載種別：機関テクニカルレポート，技術報告書，プレプリント等
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茶葉分光反射特性把握を目指したドローン付属カメラのフィルタリング検討
荻野高嶺・佐藤聖久・島田沢彦・関山絢子・豊田裕道
JACEM ( 一般社団法人 農業土木機械化協会 ) 62 27 - 32 2016年05月
記述言語：英語 掲載種別：記事・総説・解説・論説等（大学・研究所紀要）
科研費（文科省・学振）獲得実績 【 表示 ／ 非表示 】
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リモートセンシングデータを用いたモンゴル草地における 草地劣化分布の把握
2012年04月 - 2014年03月
科学研究費補助金 若手研究(B)
担当区分：研究代表者
受託研究受入実績 【 表示 ／ 非表示 】
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空間情報利活用の海外先進事例等の調査
2019年08月 - 2021年03月
株式会社パスコ 一般受託研究 一般受託研究
関山絢子
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衛星測位データを利用した首都圏の地震予測に関する研究
2017年04月 - 2020年03月
（株）地震科学探査機構 一般受託研究 一般受託研究
國井洋一
担当区分：研究代表者
講演・口頭発表等 【 表示 ／ 非表示 】
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Applicability of Farmlands Detection in Djibouti from Satellite Imagery using Deep Learning 国際会議
Ayako SEKIYAMA, Takumi SATO, Syuhei SAITO, Sawahiko SHIMADA
DT14 International Conference on Arid Land 2021年09月
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Applicability of Estimation Method for Soil Moisture in Mongolian Grasslands using a Pattern Decomposition Method 国際会議
Ayako Sekiyama, Sawahiko Shimada, Michinari Yokohama and Hiromichi Toyoda
The 6th International Conference on Environmental and Rural Development 2015年03月
開催年月日： 2015年03月
記述言語：英語 会議種別：口頭発表（一般）
開催地：フィリピン
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MONITORING OF GRASSLAND DEGRADATION USING REMOTE SENSING DATA IN MONGOLIA 国際会議
Ayako Sekiyama, Wataru Takeuchi, Sawahiko Shimada
The 11th Desert Technology 2013年11月
開催年月日： 2013年11月
記述言語：英語 会議種別：口頭発表（一般）
委員歴 【 表示 ／ 非表示 】
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日本写真測量学会 論文抄録委員会
2013年06月 - 2020年08月
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日本写真測量学会 講演会実行委員会
2022年05月 - 現在
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日本リモートセンシング学会 学術委員会
2014年06月 - 現在