Faculty Profiles - MAEDA Morihiro

Papers - MAEDA Morihiro

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Effects of aged microplastics on paddy soil properties and greenhouse gas emissions under laboratory aerobic conditions Reviewed

Tian Zhang, Hiroaki Somura, Satoshi Akao, Nozomi Nakahara, Gamamada Liyanage Erandi Priyangika Perera, Chiyu Nakano, Morihiro Maeda

Soil Science and Plant Nutrition 1 - 10 2024.12

Heat-Induced alterations in water repellency of tropical and temperate Soils: A laboratory experiment using Ultisols and Andosols Reviewed

H. T.M. Perera, D. A.L. Leelamanie, Yasushi Mori, Morihiro Maeda

Catena 243 2024.8

Publishing type：Research paper (scientific journal)

Water repellency (WR) is commonly reported in soils covered with several plant species that are rich in waxes/resins, including Pinus caribaea (PIN) and Cryptomeria japonica (CED). Due to waxy and resinous litter, these forests are highly prone to wildfires. The heat produced during wildfires alters soil WR, and these alterations may vary between tropical and temperate soils and between soil separates (SS; soil particles ≤ 2 mm) and aggregates (AG; naturally available aggregates; d = 3–5 mm). This study aims to investigate the heat-induced changes in WR of SS and AG in tropical and temperate soils. The SS and AG obtained from four different depths (0–5, 5–10, 10–15, 15–20 cm) in a PIN forest in Sri Lanka (tropical) (PINSS, PINAG) and a CED forest in Japan (temperate) (CEDSS, CEDAG) were heated to 7 heating temperatures (TH) (50, 100, 150, 200, 250, 300, 350 °C) with 2 exposure durations (DE) (1 h, 2 h). The WR were measured using the molarity of an ethanol droplet test and water drop penetration time test. The WR in PINSS and PINAG increased with increasing TH up to 100–150 °C and decreased to be non-repellent with further heating, while that of CEDSS and CEDAG progressively decreased to be non-repellent with heating. Both soil types were non-repellent at higher TH levels (≥250 °C), and 0–5 and 5–10 cm layers became non-repellent at 150–250 °C, while 10–15 and 15–20 cm layers became non-repellent at 50–150 °C. Compared to TH, DE did not significantly alter WR. The WR in two soils showed different responses to heat, especially at lower TH levels. In AG and SS, the degree of WR altered with heating similarly, while persistence (how long soil remains water-repellent) altered differently in both soil types. Research on organic matter composition and soil mineralogy may provide future insights into heat-induced alterations in WR of tested soils.

DOI： 10.1016/j.catena.2024.108230

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Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka Reviewed

B.C.L. Athapattu, S. Himanujahn, G.M.H.M. Muhandiram, Sandun Sandanayake, W.L.G.D. Perera, W.D.C. Bandara, E.A.N.V. Edirisinghe, Morihiro Maeda, Meththika Vithanage

Groundwater for Sustainable Development 25 2024.5

Heat-induced alterations in moisture-dependent repellency of water-repellent forest soils: A laboratory approach with Japanese Andosols Reviewed

H. T.M. Perera, Yasushi Mori, Morihiro Maeda, D. A.L. Leelamanie

Journal of Hydrology and Hydromechanics 72 ( 1 ) 25 - 33 2024.3

Publishing type：Research paper (scientific journal)

Soil water repellency (SWR) is a phenomenon that prevents the spontaneous wetting of numerous forest soils. It is a moisture-dependent characteristic, which disappears when soil moisture reaches near saturation. The heat generated during forest fires affects soil characteristics including SWR. The possibility of heat influencing moisture-dependent repellency (MDR) is not well understood. The present study aimed to investigate the effects of different heating temperatures (HT) and exposure durations (ED) on MDR using water-repellent Japanese Cedar (CED) and Japanese Cypress (CYP) forest soils. Soil samples collected from 0–5 cm depth were exposed to heat separately at 50, 100, and 150 °C (HT) for 1 h and 2 h durations (ED). The MDR of heated and non-heated soils was determined using the water drop penetration time (WDPT) test in a drying process. During the drying process of the tested soils, SWR appeared and then increased with drying to reach an extreme level (WDPT ≥3600 s) that persisted for a range of decreasing moisture contents, and declined to be non-repellent again (WDPT = 0 s). The critical moisture content at which soils become water-repellent with drying (CMC), the highest and the lowest moisture contents when soils showed maximum SWR (HMCmax and LMCmax, respectively), and the integrated area below the MDR curve (SWR) decreased with increasing HT in both CED and CYP soils. The moisture content at which soils become non-repellent again during drying, MCNR, was independent of the type of soil and heat treatment. The range of moisture contents between HMCmax and LMCmax, where soils show maximum SWR during drying, decreased with increasing HT, from 50 to 150 °C in CED and from 100–150 °C in CYP. The SWR showed strong positive linear correlations with CMC and HMCmax. The heat generated during wildfires can alter the MDR and all the related repellency parameters of water-repellent forest soils. SWR prevails over a narrower range of moisture contents in heated soil compared with non-heated soils. Further investigations with higher temperature levels using different soil types would be important for a comprehensive understanding of the heat impacts on MDR.

DOI： 10.2478/johh-2023-0035

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Phosphorus Release from Agricultural Drainage Sediments with Iron-Added Sediment Microbial Fuel Cells Reviewed

Perera GLEP, Maeda M, Akao S, Somura H, Nakano C, Nishina Y

Journal of Water and Environment Technology 2024.1

Emissions of CO<inf>2</inf> and CH<inf>4</inf> from Agricultural Soil with Kitchen Compost at Different Temperatures Reviewed

Tran Thi Minh Chau, Takashi Someya, Satoshi Akao, Masato Nakamura, Fumiko Oritate, Hiroaki Somura, Shinzo Yamane, Morihiro Maeda

Journal of Soil Science and Plant Nutrition 2024

Publishing type：Research paper (scientific journal)

Emissions of CO2 from the soil are mainly derived from soil microbial respiration, whereas CH4 emissions originate from anaerobic degradation of organic matter via microbial processes. Kitchen waste compost is used in the agricultural sector to improve soil quality. However, abiotic CO2 and CH4 emissions from soils amended with kitchen waste compost under aerobic conditions remain uncertain. Temperature plays an important role in organic matter decomposition in both biotic and abiotic pathways. This study aimed to evaluate biotic and abiotic emissions of CO2 and CH4 from soils receiving kitchen compost at different temperatures. Ten grams of soil amended with or without 0.1 g kitchen compost (1%) were sterilized or non-sterilized. The mixture and soil-only samples were incubated in 100-mL glass bottles at 20, 30, and 35 °C for 28 d under an aerobic condition. The results showed that CO2 and CH4 emissions increased at higher temperatures and compost application rates (p < 0.05). Emissions of CO2 mainly occurred via biotic pathways. Abiotic processes were potential pathways for CH4 generation, particularly at high temperatures of 35 °C. There was 20–24% of C in kitchen compost changed to CO2 and less than 0.1% to CH4. Our results suggest that global warming enhances abiotic CO2 and CH4 emissions and may contribute to further global warming.

DOI： 10.1007/s42729-024-01919-2

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キトサン施用が土壌中の細菌群集と機能に与える影響 Reviewed

寺畠正悟, 赤尾聡史, 前田守弘

土木学会論文集 80 ( 25 ) 2024

Effects of Sediment Microbial Fuel Cells on CH<sub>4</sub> and CO<sub>2</sub> Emissions from Straw Amended Paddy Soil Reviewed

Adhena Tesfau Bekele, Morihiro Maeda, Satoshi Akao, Hiroaki Somura, Chiyu Nakano, Yuta Nishina

Journal of Water and Environment Technology 22 ( 6 ) 271 - 285 2024

Iron-Added Sediment Microbial Fuel Cells to Suppress Phosphorus Release from Sediment in an Agricultural Drainage Reviewed

Perera GLEP, Maeda M, Somura H, Nakano C, Nishina Y

Journal of Water and Environment Technology 21 ( 5 ) 237 - 248 2023.10

原材料と焼成温度の異なるバイオ炭の酸化処理が土壌からの一酸化二窒素放出に及ぼす影響 Reviewed

増倉勇樹, 前田守弘, 中野知佑, 宗村広昭, 山根信三, 仁科勇太

日本土壌肥料学雑誌 94 ( 4 ) 245 - 253 2023.8

Alterations in aggregate characteristics of thermally heated water-repellent soil aggregates under laboratory conditions Reviewed

H. T.M. Perera, D. A.L. Leelamanie, Morihiro Maeda, Yasushi Mori

Journal of Hydrology and Hydromechanics 71 ( 2 ) 177 - 187 2023.6

Publishing type：Research paper (scientific journal)

The heat generated during wildfires modifies soil characteristics, including soil water repellency (SWR) and the water stability of aggregates, which are known to be interrelated. SWR lowers the rate of water entry into aggregates, minimizing aggregate disruption and subsequent erosion. This study aimed to examine these aggregate characteristics (SWR, water stability of aggregates) of thermally heated water-repellent soil aggregates under laboratory conditions. Water-repellent aggregates were collected from Eucalyptus grandis forest soil separately from four soil depths (0-5, 5-10, 10-15, and 15-20 cm) with varying initial repellency levels. Using an automated programmable muffle furnace, aggregates were separately exposed to three heating temperatures, TH (150, 200, 250 °C), three rates of heating (speed of rising temperature to reach relevant TH), RH (200, 400, 800 °C h-1), and three durations of exposure to relevant TH, ED (30, 60, 120 min). The molarity of an ethanol droplet test was used to measure the contact angle (contact angle>90°). The water drop penetration time (WDPT) was also measured. The SWR of aggregates declined with the increasing TH and ED. All aggregates were wettable once exposed to 250 °C. At the lowest TH and ED (150 °C, 30 min), the contact angle was <90° only in the least repellent aggregates collected from 10-15 and 15-20 cm depths. Although RH indicated the least influence on the measured parameters, the slowest RH (200 °C h-1) caused a comparatively greater decline in SWR. Water stability of aggregates increased with heating irrespective of decreasing SWR. Further investigations on heat-induced changes in organic compounds at molecular levels would be necessary to understand the theories for the behavior of aggregates.

DOI： 10.2478/johh-2023-0009

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Greenhouse gas emissions from agricultural soil amended with kitchen compost of varying ages Reviewed

Tran T.M.C, Someya T, Akao S, Nakamura M, Oritate F, Somura H, Yamane S, Maeda M

Soil Science and Plant Nutrition 69 ( 2 ) 137 - 147 2023.1

Development of international collaboration and our challenges to regional issues in soil science and plant nutrition research： 1. Introduction

Maeda Morihiro, Nakamura Masato

Japanese Journal of Soil Science and Plant Nutrition 93 ( 6 ) 403 - 404 2022.12

Artificial macropores and water management effects on reduction of greenhouse gas emissions from rice paddy fields Reviewed

Thanh Long Bui, Yasushi Mori, Morihiro Maeda, Hiroaki Somura

Environmental Challenges 9 100657 - 100657 2022.12

Effects of local land-use policies and anthropogenic activities on water quality in the upstream Sesan River Basin, Vietnam Reviewed

Vo Ngoc Quynh Tram, Hiroaki Somura, Toshitsugu Moroizumi, Morihiro Maeda

Journal of Hydrology: Regional Studies 44 101225 - 101225 2022.12

Nitrous oxide and carbon dioxide emissions from two soils amended with different manure composts in aerobic incubation tests

Thanuja Deepani Panangala Liyanage, Morihiro Maeda, Hiroaki Somura, Nguyen Thi Thu Thuong, Makito Mori, Taku Fujiwara

Soil Science and Plant Nutrition 68 ( 4 ) 491 - 504 2022.7

Nitrous oxide and carbon dioxide emissions from two types of soil amended with manure compost at different ammonium nitrogen rates

Thanuja Deepani Panangala Liyanage, Morihiro Maeda, Hiroaki Somura, Makito Mori, Taku Fujiwara

Soil Science and Plant Nutrition 68 ( 4 ) 1 - 18 2022.6

Macropore structure and water management affect greenhouse gas emissions in agricultural fields Reviewed

Bui T.L., Mori Y., Yamamoto Y., Maeda M.

Paddy and Water Environment 19 ( 4 ) 661 - 672 2021.7

Potential sources of ammonium-nitrogen in the coastal groundwater determined from a combined analysis of nitrogen isotope, biological and geological parameters, and land use Reviewed

Anna Fadliah Rusydi, Shin Ichi Onodera, Mitsuyo Saito, Fujio Hyodo, Morihiro Maeda, Khori Sugianti, Sunarya Wibawa

Water (Switzerland) 13 ( 1 ) 2021.1

Language：English Publishing type：Research paper (scientific journal)

The origin of ammonium-nitrogen in Indonesian coastal groundwater has not been intensively examined, meanwhile the elevated concentration remains a concern. This research aims at tracing the potential sources of ammonium-nitrogen in the groundwater of Indramayu, Indonesia where groundwater is vital for livelihood. From results, a combined examination of nitrogen isotope, coliform bacteria, land-use, and geology confirmed the natural and anthropogenic origins of ammonium-nitrogen in the groundwater. In the brackish-water aquaculture region, groundwater has δ N values from +1.8 to +4.8‰ signifying that ammonium-nitrogen is derived from mineralization of organic nitrogen to ammonium. Furthermore, ammonium has a significantly positive relationship with sodium indicating the exchangeable ammonium is mobilized to groundwater via cation exchange. Meanwhile ammonium-nitrogen from anthropogenic waste was detected in agricultural and residential region. The groundwater has more varied δ N values, from −2.9 to +16.1‰, which implies attenuation of ammonium-nitrogen from several sources namely manure, mineral fertilizer, sewage, and pit latrines. Also, the presence of E. coli confirms the indication of human and animal waste contamination. However, since ammonium has no relationship with sodium, cation exchange is not feasible and ammonium-nitrogen flows into the groundwater from anthropogenic sources along with liquid wastes. 15 15 NH4 NH4

DOI： 10.3390/w13010025

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Simultaneous recovery of phosphorus and potassium from biomass as magnesium salt Reviewed

H. Nagare, T. Iwata, A. Ebi, S. Akao, M. Maeda, D. Yasutake, T.Fujiwara

土木学会論文集G（環境） 76 ( 7 ) 181 - 187 2020.12

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