Article
Environmental Sciences
Ouyuan Jiang, Yong Li, Yue Zheng, Williamson Gustave, Xianjin Tang, Jianming Xu
Summary: This study revealed the effect and mechanism of Cd on CH4 emissions in paddy soils. The results showed that the addition of Cd reduced CH4 emissions and promoted the conversion of CH4 to CO2. The abundance of methanotrophs increased with Cd addition and showed a positive correlation with CH4 emissions. Furthermore, the composition of the microbial community was barely affected by Cd. This study provides a better understanding of the role of rice paddies in global CH4 cycling.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Xiong Yang, Dongming Wang, Ye Tao, Min Shen, Wei Wei, Chuang Cai, Changfeng Ding, Jiuyu Li, Lian Song, Bin Yin, Chunwu Zhu
Summary: This study investigates the effects and mechanisms of elevated CO2 concentration on cadmium (Cd) uptake by rice in a 3-year experiment. The results show that increased CO2 concentration leads to higher levels of dissolved Fe2+ in soil, resulting in more low-crystalline Fe oxides being deposited on the root surface. This inhibits the uptake of Cd by rice.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Can Feng, Heng Zhang, Yi Ren, Mengfan Luo, Siying Yu, Zhaokun Xiong, Yang Liu, Peng Zhou, Bo Lai
Summary: Copper sulfide was found to enhance the degradation of organic pollutants in the zerovalent iron/hydrogen peroxide system by accelerating the dissolution of iron and the cycling of Fe(III)/Fe(II). The introduction of copper sulfide resulted in a sustainable and high-efficiency iron-based oxidation system for the removal of organic contaminants. This study provides insights into the promotion effects of copper sulfide on zerovalent iron dissolution and Fe(III)/Fe(II) cycling in zerovalent iron-based Fenton-like processes.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Ning Ma, Ruining Cai, Chaomin Sun
Summary: Biomineralization is an important process utilized by microorganisms to sequester heavy metal ions, with this study showing the significant improvement of cadmium resistance and removal abilities in a deep-sea bacterium through CdS nanoparticle biomineralization using L-cysteine. The psTD enzyme was identified as a key factor in enhancing bacterial cadmium resistance and directing the formation of CdS nanoparticles. Results also showed the development of single-enzyme biomineralization of CdS nanoparticles driven by psTD, indicating its potential as a capping reagent for controlling the size and structure of nanocrystals.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Geosciences, Multidisciplinary
Yu Wang, Yuanyuan Huang, Lian Song, Jiahui Yuan, Wei Li, Yongguan Zhu, Scott X. Chang, Yiqi Luo, Philippe Ciais, Josep Penuelas, Julie Wolf, Barbara J. Cade-Menun, Shuijin Hu, Lei Wang, Dengjun Wang, Zengwei Yuan, Yujun Wang, Jishuang Zhang, Ye Tao, Shenqiang Wang, Gang Liu, Xiaoyuan Yan, Chunwu Zhu
Summary: Long-term free air carbon dioxide enrichment experiments on rice plants show that plant-available phosphorus declines in paddy soils as atmospheric CO2 increases. The decline in phosphorus concentration is attributed to the production of soil organic phosphorus that is not readily available to plants, as well as increased loss through crop harvest. These findings suggest that future CO2 scenarios may lead to reduced rice yields, particularly in low-income countries, unless additional phosphorus fertilizers are applied.
Article
Agronomy
Rui Yuan, Tianren Si, Qingquan Lu, Cheng Liu, Rongjun Bian, Xiaoyu Liu, Xuhui Zhang, Jufeng Zheng, Kun Cheng, Stephen Joseph, Yan Wang, Lianqing Li, Genxing Pan
Summary: The mechanisms of rape straw biochar in fixing cadmium in paddy soil by influencing redox reactions of iron and sulfur are unclear. This study found that biochar produced at higher pyrolysis temperature increased the electron exchange capacity and electrical conductivity of soil, enhancing the reduction of Fe oxide and increasing the binding of Cd with Fe and Mn oxides. In contrast, biochar produced at lower pyrolysis temperature increased the sulfide content in soil, increasing the contribution of sulfide to Cd fixation.
Article
Plant Sciences
Yangxia Zheng, Ran Zhang, Ying Zhu, Qiaoman Ao, Han Liu, Aihui Li, Lijin Lin, Li Wang
Summary: This study investigated the effects of salicylic acid (SA) on the growth and Cd phytoremediation capability of the aquatic accumulator plant Nasturtium officinale. The results showed that 150 mg/L of SA concentration had the most significant promoting effect on the growth and phytoremediation capability of N. officinale.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Engineering, Environmental
Yunyun Li, Nali Zhu, Wenjun Hu, Yu-rong Liu, Wen Jia, Guoming Lin, Hong Li, Yufeng Li, Yuxi Gao, Jiating Zhao
Summary: Sulfur can effectively treat mercury pollution, but recent studies have found conflicting effects between reducing mercury mobility and promoting mercury methylation. The potential mechanism of MeHg production under different sulfur-treated species and doses is not well understood. This study investigated MeHg production in Hg-contaminated paddy soil and its accumulation in rice under elemental sulfur or sulfate treatment at different levels. The results provide insights into the mechanism of sulfur-induced MeHg production and suggest potential strategies for decreasing mercury mobility.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Huiling Yu, Delai Zhong, Hongyuan Zeng, Bojun Huang, Xin Wang, Bo Peng, Baoshan Xing
Summary: Liming acidic paddy soils to near-neutral pH is the most cost-effective strategy to minimize cadmium (Cd) accumulation by rice. However, the effect of liming on arsenic (As) (im)mobilization is still controversial and warrants further investigation, especially for paddy soils co-contaminated with As and Cd. This study explored As and Cd dissolution along pH gradients in flooded paddy soils and identified the relative availability of Fe under competition from dissolved organic carbon (DOC) as a key factor. The mole ratio of porewater Fe/DOC at pH 6.5-7.0 is suggested as an indicator of whether co-immobilization of As and Cd can occur in limed paddy soils.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Yun Wang, Hai Liang, Shun Li, Zihan Zhang, Yulin Liao, Yanhong Lu, Guopeng Zhou, Songjuan Gao, Jun Nie, Weidong Cao
Summary: Co-utilizing milk vetch and rice straw with lime can reduce the cadmium content in rice, change the distribution of different chemical forms of Cd in soil, and benefit the formation of a more stable residual fraction of Cd. Soil pH and dissolved organic matter (DOM) have the greatest impacts on Cd availability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Lu Yan, Xin Wang, Xionghui Ji, Bo Peng
Summary: The co-uptake and high accumulation of arsenic and cadmium by rice poses a threat to public health. However, a field trial showed that removing rice roots after efficient extraction of arsenic and cadmium from paddy soil can significantly reduce the levels of these toxic elements in both soil and rice, contributing to rice safety in contaminated areas.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Shiwei Yan, Jianhao Yang, Youbin Si, Xianjin Tang, Youhua Ma, Wenling Ye
Summary: The supply of sulfate has been found to reduce the bioavailability of arsenic (As) and cadmium (Cd) in paddy soil contaminated with both metals. The effect of sulfate addition, however, varies depending on the soil environment, potentially due to differences in sulfate background levels. Additionally, the addition of sulfate stimulates the activity of sulfate-reducing bacteria, which can positively affect rice growth and physiological characteristics.
Article
Environmental Sciences
Hong-Ping Chen, Peng Wang, Jia-Dong Chang, Peter M. Kopittke, Fang-Jie Zhao
Summary: This study compared various methods to reduce grain Cd concentrations in different levels of Cd-contaminated soils, showing that genetic engineering is the most effective approach, significantly decreasing Cd accumulation.
Article
Soil Science
Xuelian Gan, Jing Zhao, Qingling Fu, Jun Zhu, Huan He, Hongqing Hu
Summary: The study investigates the influence of carbon-iron coupling on nitrous oxide (N2O) emissions in paddy soils. The results show that iron promotes N2O emissions while glucose inhibits N2O emissions. Carbon-iron coupling reduces N2O emissions and increases nitrogen (N-2) emissions.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2023)
Article
Soil Science
Xuelian Gan, Jing Zhao, Qingling Fu, Jun Zhu, Huan He, Hongqing Hu
Summary: This study investigated the influence of carbon-iron coupling on nitrous oxide (N2O) emissions in paddy soils. The results showed that iron promoted N2O emissions, while glucose inhibited N2O emissions. Carbon-iron coupling decreased N2O emissions and increased nitrogen (N2) emissions, indicating the conversion of N2O to N2.
EUROPEAN JOURNAL OF SOIL SCIENCE
(2023)
Article
Geochemistry & Geophysics
Noriko Yamaguchi, Toshiaki Ohkura, Atsuko Hikono, Yohey Hashimoto, Aomi Suda, Taku Yamamoto, Kaori Ando, Masahiro Kasuya, Paul Northrup, Shan-Li Wang, Dean Hesterberg
Summary: Global concerns about the sustainable agriculture have led to the emphasis on reducing mineral fertilizer usage. This study investigated the distribution and speciation of accumulated phosphorus in soils through macro- and microscopic techniques, with results showing that compost application contributed to creating diverse microenvironments for hosting phosphorus in the soils.
Article
Soil Science
Aomi Suda, Noriko Yamaguchi
Summary: The study revealed that only active aluminum had a significant inhibitory effect on arsenic solubility in anaerobic soils, indicating the potential importance of active aluminum in limiting arsenic dissolution in anoxic environments.
Article
Plant Sciences
Kaori Ando, Noriko Yamaguchi, Yoshitaka Nakamura, Masahiro Kasuya, Katsutoshi Taki
Summary: The study found that phosphorus accumulated in cropland soils is mainly in the form of calcium phosphate due to the high application of P fertilizer and manure with lime. Phosphorus extracted by NH4F is associated with oxalate extractable Al and Fe, while phosphorus species associated with Al and Fe are extracted by NH4F contradicting the operational definition of NH4F-soluble species. Additionally, the P extracted by NaOH is correlated with various soil properties, especially clay content.
SOIL SCIENCE AND PLANT NUTRITION
(2021)
Article
Soil Science
Akira Takamoto, Yohey Hashimoto, Maki Asano, Keiichi Noguchi, Rota Wagai
Summary: The study investigated the distribution and chemical species of phosphorus in relation to iron and aluminum phases in two Andisols, revealing a stronger control of aluminum phases over phosphorus compared to iron phases. Phosphorus was primarily associated with aluminum, with organic and inorganic phosphorus reservoirs being important in low- to meso-density fractions in Andisols.
Article
Environmental Sciences
Yuki Itaya, Kenji Kuninishi, Yohey Hashimoto
Summary: Arsenic, selenium, and chromium can be harmful at certain concentrations and may be eluted from coal ash discharged from coal-fired power plants. Arsenic and selenium are eluted in forms that can be readily insolubilized, while chromium is eluted in the form of carcinogenic hexavalent chromium.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2022)
Article
Environmental Sciences
Hirofumi Tsukada, Daigo Yamada, Noriko Yamaguchi
Summary: Despite the presence of minerals that allow Cs fixation in soils, 137Cs remains available to crops for several years after its deposition. Due to the larger amounts of organic matter derived from contaminated herbage, these organic matter plays an important role in the fate of 137Cs in pasture soils, impacting the transfer of 137Cs from soil to plants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Hafiza Afia Murad, Mahtab Ahmad, Jochen Bundschuh, Yohey Hashimoto, Ming Zhang, Binoy Sarkar, Yong Sik Ok
Summary: In this study, peanut-shell-derived biochars modified with CTAB were successfully used for the adsorption and immobilization of Cr(VI) in water and soil, showing high removal efficiency and significant decreases in the bioavailability, leachability, and bioaccessibility of Cr(VI).
ENVIRONMENTAL RESEARCH
(2022)
Article
Soil Science
Shoko Uchida, Yohey Hashimoto, Akira Takamoto, Keiichi Noguchi, Wantana Klysubun, Shan-Li Wang
Summary: This study investigates the adsorption behavior of allophane and ferrihydrite in volcanic ash soils with regards to phosphate. The results show that allophane has a higher affinity for phosphate compared to ferrihydrite, especially at low to intermediate concentrations. Additionally, the study finds that precipitation of Al-phosphate occurs in allophane and allophane-ferrihydrite mixtures.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2022)
Article
Environmental Sciences
Lunchao Duan, Qianhui Wang, Jining Li, Fenghe Wang, Hao Yang, Binglin Guo, Yohey Hashimoto
Summary: This study investigates the feasibility of using zero-valent iron (ZVI) and Fe3O4-loaded biochar for immobilizing lead (Pb) in contaminated sandy soil. The results show that both materials effectively transfer the available Pb into more stable fractions, with ZVI outperforming the magnetic biochar. Additionally, ZVI promotes plant growth while Fe3O4-loaded biochar has a negative effect. Both materials significantly decrease Pb accumulation in aboveground and root tissues.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Yuki Nagao, Kiyotaka Yoshii, Youichi Yoshida, Yohey Hashimoto
Summary: Coal fly ash (CFA) contains potentially hazardous trace elements. Characterizing these trace elements in CFA is crucial for its safe disposal and recycling. This study aimed to determine the solubility of these trace elements in CFA and utilize various analytical techniques to characterize their distribution and speciation. The results showed that the solubility of trace elements varied, with B being the most soluble and Cr(IV) being the least soluble. The combination of TOF-SIMS, micro-PIXE, and XAFS techniques provided valuable insights into the spatial distribution and chemical forms of trace elements in CFA.
Article
Soil Science
Noriko Yamaguchi, Atsuko Hikono, Aomi Suda, Yohey Hashimoto, Saeko Yada, Masatoshi Ooshima, Taku Yamamoto, Kaori Ando, Masahiro Kasuya
Summary: The use of phosphate fertilizer in greenhouse farming leads to the accumulation of surplus phosphorus compounds in soil. In this study, we characterized the phosphorus compounds in greenhouse soils by comparing their speciation in samples collected from greenhouses and an open field. The results showed a larger proportion of phosphorus compounds associated with calcium in the greenhouse soil, particularly in the form of inorganic calcium-phosphate compounds. Heterogeneously distributed spots of calcium phosphate were found at the microscale in the greenhouse soil.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2023)
Review
Environmental Sciences
Wei Zhang, Yoora Cho, Meththika Vithanage, Sabry M. Shaheen, Joerg Rinklebe, Daniel S. Alessi, Chia-Hung Hou, Yohey Hashimoto, Piumi Amasha Withana, Yong Sik Ok
Summary: Arsenic is a harmful contaminant in the environment, and biochar has been widely used as an adsorbent for removing arsenic from water and soils. Modified biochars have shown promise for enhanced arsenic adsorption, but further research is needed for improving their performance and application.
Article
Plant Sciences
Shimpei Hayashi, Masato Kuramata, Tadashi Abe, Noriko Yamaguchi, Hiroki Takagi, Hachidai Tanikawa, Manaka Iino, Kazuhiko Sugimoto, Satoru Ishikawa
Summary: This study identified a rice mutant, las3, with decreased arsenic levels in aerial tissues including grains, due to a mutation in the alcohol dehydrogenase (ADH) 2 gene under anaerobic conditions. The low-As phenotype in las3 was found to be associated with the suppression of silicate transporters, providing valuable insights into reducing arsenic levels in rice grains.
