Faculty Profiles - TSUJIMOTO Kumiko

Papers - TSUJIMOTO Kumiko

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Validation of AMSR2 and SMOS soil moisture products with worldwide in-situ observations from 2012 to 2020 Reviewed

Kumiko Tsujimoto, Tetsu Ohta

The Journal of Japan Society of Civil Engineers 2024

人工衛星搭載マイクロ波放射計AMSR2に基づく全球土壌水分量推定アルゴリズムの改良提案と結果の検証 Reviewed

辻本久美子, 太田哲

土木学会論文集B1(水工学) 2023

Comparison of the Dobson model with other dielectric models at the C-band microwave band Invited Reviewed

Kumiko Tsujimoto

Journal of JJSCE 2023

Effect of the change of the wet-soil dielectric model in the microwave soil moisture retrieval algorithm from satellite Reviewed

Kumiko Tsujimoto, Tetsu Ohta

The Journal of Japan Society of Civil Engineers 78 ( 2 ) I_517 - I_522 2022.11

Dielectric behavior of wet soils in the 1-36 GHz microwave range: Modeling and validation Reviewed

Kumiko Tsujimoto, Tetsu Ohta, Hideyuki Fujii, Mitsuru Komatsu

Journal of the Japanese Society of Soil Physics 151 ( 151 ) 3 - 24 2022.7

Backwater Effect of Clogging of Aquatic Plants at Fine-Particle Screens on Inland Flooding in Okayama Reviewed

Takumi Inaba, Kumiko Tsujimoto, Yoshitaka Nakashima

Water 14 ( 13 ) 1980 - 1980 2022.6

Quantifying the GCM-related uncertainty for climate change impact assessment of rainfed rice production in Cambodia by a combined hydrologic - rice growth model Reviewed

Kumiko Tsujimoto, Nana Kuriya, Tetsu Ohta, Koki Homma, Monichoth So Im

Ecological Modelling 464 109815 - 109815 2022.2

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

The effects of climate change on agriculture are a major concern for global food security. In this study, the impacts of climate change on rainfed rice production in the granary of Cambodia were examined on a basin scale by developing and applying a combined model consisting of a crop model and a basin-scale distributed hydrological model. The response of rice production to soil-water availability was simulated for past (1981–2000) and future (2041–2060, 2081–2100) periods. From 34 general circulation models (GCMs) that participated in the Coupled Model Intercomparison Project Phase 5 (CMIP5), 5 GCMs were selected by evaluating monthly rainfall in the past. Although annual rainfall was projected to increase by all five selected GCMs, notable decreases in rainfed rice production were projected with 3 GCMs, while small changes were projected with the other 2 GCMs. The main factor restricting future rice production was soil water availability, brought by the projected change in the seasonal distribution of rainfall and the projected more severe dry spells in the early monsoon season. The results suggest the importance of the selection and bias correction of GCMs to force rice crop models and of the simulation of soil water flow on a basin scale for the assessment of rain-fed rice production. In particular, improvements in projections of rainfall amounts over shorter periods rather than annual or seasonal periods, which fit within the time scales of rice plant growth, were suggested to be important.

DOI： 10.1016/j.ecolmodel.2021.109815

Scopus

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Multiyear analysis of the dependency of the planting date on rainfall and soil moisture in paddy fields in Cambodia, 2003–2019 Reviewed

Kumiko Tsujimoto, Kotaro Ono, Tetsu Ohta, Koemorn Chea, E-Nieng Muth, Sanara Hor, Lyda Hok

Paddy and Water Environment 19 ( 4 ) 635 - 648 2021.7

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

<title>Abstract</title>The dependencies of the planting date on rainfall and soil moisture in paddy fields in Cambodia were analyzed to quantify farmers’ empirical knowledge regarding their decision of the planting date. Remote sensing data from multiple satellites covering the 2003–2019 period were analyzed. The planting dates in rain-fed paddies ranged from April to August, with large spatial variations and year-to-year fluctuations. In years when planting was suppressed in April and May, planting was extensively enhanced in June and August compared to normal years, and vice versa. Over the northeastern side of Tonle Sap Lake and south of Phnom Penh city, the areas planted in April and May were found to have positive correlations with rainfall and soil moisture, suggesting that wetter-than-average conditions encouraged farmers to plant earlier in the season. In contrast, this relationship was unclear on the western side of Tonle Sap Lake, where the rainfall amounts were larger throughout the year than in other areas in Cambodia. In this region, the relationship between the planting area and soil water availability was either unclear or was even slightly negative from June to August. Since more frequent dry spells have been detected after the onset of the rainy season in recent years, further studies and disseminations of potential changes in dry spells are important for the agronomic adaptation of planting dates under climate change.

DOI： 10.1007/s10333-021-00863-6

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Other Link： https://link.springer.com/article/10.1007/s10333-021-00863-6/fulltext.html

Dielectric mixing models of moist soils for microwave satellite observation of soil moisture: a theoretical analysis Reviewed

Kumiko Tsujimoto

75 ( 2 ) I_7 - I_12 2019.8

When do rice terraces become rice terraces? Invited Reviewed

Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

Paddy and Water Environment 1 ( 8 ) 2019.3

Estimation of planting date in paddy fields by time-series MODIS data for basin-scale rice production modeling. Invited Reviewed

Kumiko Tsujimoto, Tetsu Ohta, Yoshihiro Hirooka, Koki Homma

Paddy and Water Environment 1 ( 8 ) 2019.3

Numerical and experimental study on the risk of paddy field damage due to river bank breach during serious floods. Invited Reviewed

Tetsuro Tsujimoto, Kumiko Tsujimoto

Paddy and Water Environment 1 ( 8 ) 2019.3

Land-Lake-Atmosphere Interaction under Global Climate Change and Regional Landuse Change over a Large Tropical Lake and its Vicinities: case study in Cambodia

Kumiko Tsujimoto

Environmental Risks for Socioeconomic Development: Proceedings of the 3rd (2nd STEPS) Russian-Japanese Collaboration Seminar for Sustainable Development 171 - 176 2018.9

Diurnal pattern of rainfall in Cambodia: its regional characteristics and local circulation Reviewed

Kumiko Tsujimoto, Tetsu Ohta, Kentaro Aida, Katsunori Tamakawa, Monichoth So Im

Progress in Earth and Planetary Science 39 ( 5 ) 2018.8

Parallel improvement of hydrological simulation and microwave satellite soil moisture observation with a unified soil water model Reviewed

Kumiko Tsujimoto, Tetsu Ohta, Yasushi Mori

The Journal of Japan Society of Civil Engineers 74 ( 4 ) I_979 - I_984 2018.2

Risk of paddy field damage due to river bank breach during serious flood Reviewed

Tetsuro Tsujimoto, Kumiko Tsujimoto

proceedings of PAWEES-INWEPF 2018

When do rice terraces become rice terraces? Reviewed

Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

proceedings of PAWEES-INWEPF 2018

Estimation of planting date in paddy fields by time-series MODIS data for basin-scale rice production modelling Reviewed

Kumiko Tsujimoto, Tetsu Ohta, Yoshihiro Hirooka, Koki Homma

proceedings of PAWEES-INWEPF 2018

Climate change impact on rice production in Musi river basin in Indonesia

Koki Homma, Toshio Koike, Kumiko Tsujimoto, Tetsu Ohta

Journal of Earth Science & Climatic Change 08 ( 10 ) 31 2017

Evaluation of cultivation environment and management based on LAI measurement in farmers' paddy fields in Pursat province, Cambodia

Yoshihiro Hirooka, Koki Homma, Taisuke Kodo, Tatsuhiko Shiraiwa, Kim Soben, Mithona Chann, Kumiko Tsujimoto, Katsunori Tamagawa, Toshio Koike

FIELD CROPS RESEARCH 199 150 - 155 2016.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Rice is by far the most important crop in Cambodia. The improvement of its productivity is strongly recommended, but information about cultivation environment, management and their effects on rice production in farmers' paddy fields is quite limited. This study periodically measured the leaf area index (LAI) by using a plant canopy analyzer and conducted yield, water, soil and management investigations in 77 farmers' paddy fields in the Bakan district, Pursat province, Cambodia in 2014. Because the LAI showed linear growth in almost all farmers' fields, the LAI growth rate was determined by linear regression. The grain yield ranged from 70.8 gm(-2) to 499.0 gm(-2) and was positively correlated with the maximum LAI. The variability in the maximum LAI was mainly explained by the LAI growth rate, while the growth period had a significant correlation with the maximum LAI only in the broadcast fields, where earlier planting led to larger LAI. The result of the ANCOVA shows that the LAI growth rate was affected by seeding date, water status and soil condition (C content and C/N ratio) while the effect of planting method (transplanting/broadcasting) and N fertilizer was non-significant. The non-significance of effect of N fertilizer may imply the timing or method of application is improper. The results suggest that the key means to improve rice productivity are effective application of fertilizer and selection of planting methods dependent on the soil fertility, together with water-saving irrigation method. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.fcr.2016.08.031

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