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1st SEMIRATA-International Conference on Science and Technology, SEMIRATA-ICST 2018

作者： Irhamni Pandia, S. Purba, E. Hasan, W. Study Program Management of Natural Resources and Environment Universitas Sumatera Utara Medan Indonesia Teaching Staff Faculty of Chemical Engineering Universitas Sumatera Utara Medan Indonesia Faculty of Agriculture Universitas Sumatera Utara Medan Indonesia Faculty of Public Health Universitas Sumatera Utara Medan Indonesia

The process of continuous landfill in the area of the final disposal (landfill) of waste produces pollutants such as leachate (leachate) is a liquid containing dissolved substances and suspended very fine as a result of waste decomposition by microbes. Leachate water contains decomposing organic materials and heavy metal materials. Heavy metals (Cr, Hg, Pb, Cu, Fe, Mn, Zl, Cl) present in leachate water are from waste that has been disposed to TPA Keudah Kota Banda Aceh. The author would like to do research on the adsorption of heavy metals by using Atomic Absorption Spectrophotometer in landfill leachate Banda Aceh. The purpose of this research is to get the absorption of some heavy metals in the landfill leachate by using AAS analysis method. The results of the analysis in landfill leachate solution Banda Aceh by using Atomic Adsorption Spectrohotometer its highest uptake in heavy metal parameters Iron (Fe) amounted to 10.9191 ppm, and is followed by the parameters of heavy metals (Ni) 0.9820 ppm, ( Zn) 0.4188 ppm, (Co) 0.1698, (Cu) 0.1198 ppm, (Pb) 0.0602 ppm, (Cr) 0.0502 ppm, (Hg), and (Cu) Cd) the results are not detected (ND). Considering that Indonesia in the future is still faced with environmental pollution problem as a result of the development, the restoration and rehabilitation of contaminated land needs to get mutual attention, such as by using dilution method, stabilization, and phytoremdiation technique. © Published under licence by IOP Publishing Ltd.

关键词： Heavy metals

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Transforming the Culture of Data management in a Federal Science Agency, One Client at a Time

CSA News

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CSA News 2021年第3期66卷

作者： Peter J.A. Kleinman Daren Harmel Jim Ippolito Sarah Beebout Marlen Eve Michael Buser Research Leader USDA-ARS Pasture Systems and Watershed Management Research Unit University Park PA Director USDA-ARS Center for Agricultural Resources Research Fort Collins CO Associate Professor Colorado State University Department of Soil and Crop Sciences Fort Collins CO National Program Leader for Sustainable Intensification USDA-ARS Office of National Programs Beltsville MD Deputy Director for Natural Resources and Sustainable Agricultural Systems USDA-ARS Office of National Programs Beltsville MD National Program Leader for Engineering USDA-ARS Office of National Programs Beltsville MD

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Retraction notice to "Cellulose microcrystalline: A promising ecofriendly approach to control Culex quinquefasciatus larvae" [STOTEN 901 (2023) 165952]

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The Science of the total environment 2024年 957卷 177685页

作者： Sindoval Silva de Souza Alex Rodrigues Gomes Abraão Tiago Batista Guimarães Aline Sueli de Lima Rodrigues Letícia Paiva de Matos Juliana Dos Santos Mendonça Thiarlen Marinho da Luz Stênio Gonçalves da Silva Matos M Safiur Rahman Chinnasamy Ragavendran Sengottayan Senthil-Nathan Ajay Guru Md Refat Jahan Rakib Nabisab Mujawar Mubarak Md Mostafizur Rahman Thiago Lopes Rocha Abu Reza Md Towfiqul Islam Guilherme Malafaia Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goi'as Goiânia GO Brazil Laboratory of Toxicology Applied to the Environment Goiano Federal Institute - Urutaí Campus Rodovia Geraldo Silva Nascimento 25 km Zona Rural Urutaí GO Brazil. Laboratory of Toxicology Applied to the Environment Goiano Federal Institute - Urutaí Campus Rodovia Geraldo Silva Nascimento 25 km Zona Rural Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil. Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil. Department of Environmental Science and Disaster Management Noakhali Science and Technology University Noakhali 3814 Bangladesh. Saveetha Dental College and Hospitals (SIMATS) Saveetha University Chennai Tamil Nadu India. Division of Biopesticides and Environmental Toxicology Sri Paramakalyani Centre for Excellence in Environmental Sciences Manonmaniam Sundaranar University Alwarkurichi Tirunelveli Tamil Nadu 627 412 India. Department of Cariology Saveetha Dental College and Hospitals SIMATS Chennai 600 077 Tamil Nadu India. Noakhali Science and Technology University Noakhali Bangladesh. Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri Begawan BE1410 Brunei Darussalam Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India. Jahangirnagar University Dhaka 1342 Bangladesh. Laboratory of Environmental Biotechnology and Ecotoxicology Institute of Tropical Pathology and Public Health Federal University of Goiás Goiânia Goiás Brazil. Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh. Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil

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24-Dehydrohippuristanol, a cytotoxic spiroketal steroid from Isis hippuris

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Tetrahedron Letters 2023年 123卷

作者： Yi-Qi Huang Amina M Illias Po-Jen Chen Su-Ying Chien Yueh-Hsiung Kuo Chou-Yuan Ko Chun-Feng Chang Zhi-Hong Wen Tsong-Long Hwang Ping-Jyun Sung Graduate Institute of Marine Biology National Dong Hwa University Pingtung 944401 Taiwan National Museum of Marine Biology and Aquarium Pingtung 944401 Taiwan Department of Anesthesiology Chang Gung Memorial Hospital Taoyuan 333423 Taiwan Graduate Institute of Clinical Medical Sciences College of Medicine Chang Gung University Taoyuan 333323 Taiwan Clinical Immunology Laboratory Department of Medical Research E-Da Hospital I-Shou University Kaohsiung 824005 Taiwan Instrumentation Center National Taiwan University Taipei 106319 Taiwan Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources China Medical University Taichung 404333 Taiwan Department of Medical Laboratory Science and Biotechnology Asia University Taichung 413305 Taiwan Chinese Medical Research Center China Medical University Taichung 404333 Taiwan Division of Gastroenterology Department of Internal Medicine Kaohsiung Armed Forces General Hospital Kaohsiung 802301 Taiwan Institute of Medical Science and Biotechnology National Sun Yat-sen University Kaohsiung 804201 Taiwan Division of Urology Department of Surgery Kaohsiung Armed Forces General Hospital Kaohsiung 802301 Taiwan Department of Marine Biotechnology and Resources National Sun Yat-sen University Kaohsiung 804201 Taiwan Research Center for Chinese Herbal Medicine Graduate Institute of Healthy Industry Technology College of Human Ecology Chang Gung University of Science and Technology Taoyuan 333324 Taiwan Graduate Institute of Natural Products College of Medicine Chang Gung University Taoyuan 333323 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City 243303 Taiwan Chinese Medicine Research and Development Center China Medical University Hospital Taichung 404394 Taiwan Graduate Institute of Natural Products Kaohsiung Medical University Kaohsiung 807378 Taiwan Program in Pharmaceutical Biotechnology Fu Jen Catholic University New Taipei City 242062 Taiwan

Chemical screening of a Formosan sea bamboo octocoral Isis hippuris have led to the isolation of nine spiroketal steroids, including a new metabolite, 24-dehydrohippuristanol ( 1 ), a new natural product, hippuristanol 11-one ( 2 ), as well as seven known analogs, hippuristanol ( 3 ), 22- epi -hippuristanol ( 4 ), hippurin-1 ( 5 ), 22- epi -hippurin-1 ( 6 ), 3-acetyl-22- epi -hippurin-1 ( 7 ), 3α-acetoxy-11β-hydroxy-24-methyl-22,25-epoxy-5α-furostan-18,20β-lactone ( 8 ) and (22 S )-3α-acetoxy-11β,18α-dihydroxy-24-methyl-18,20β;22,25-diepoxy-5α-furostane ( 9 ). The structures of steroids 1 – 9 were corroborated by 2D NMR experiments and comparison with literature data. The configurations of steroids 3 , 4 , 6 and 9 , obtained in previous studies, were reported for the first time in this study by single-crystal X-ray diffraction analysis. Steroid 1 exhibited cytotoxic effects against DLD-1 and LoVo cancer cells with IC 50 values of 5.54 and 6.89 μM, respectively.

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Corrigendum to “24-Dehydrohippuristanol, a cytotoxic spiroketal steroid from Isis hippuris ”[Tetrahedron Lett. 123 (2023) 154540]

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Tetrahedron Letters 2023年 124卷

作者： Yi-Qi Huang Amina M. Illias Po-Jen Chen Su-Ying Chien Yueh-Hsiung Kuo Chou-Yuan Ko Chun-Feng Chang Zhi-Hong Wen Tsong-Long Hwang Ping-Jyun Sung Graduate Institute of Marine Biology National Dong Hwa University Pingtung 944401 Taiwan National Museum of Marine Biology and Aquarium Pingtung 944401 Taiwan Department of Anesthesiology Chang Gung Memorial Hospital Taoyuan 333423 Taiwan Graduate Institute of Clinical Medical Sciences College of Medicine Chang Gung University Taoyuan 333323 Taiwan Clinical Immunology Laboratory Department of Medical Research E-Da Hospital I-Shou University Kaohsiung 824005 Taiwan Instrumentation Center National Taiwan University Taipei 106319 Taiwan Department of Chinese Pharmaceutical Sciences and Chinese Medicine Resources China Medical University Taichung 404333 Taiwan Department of Medical Laboratory Science and Biotechnology Asia University Taichung 413305 Taiwan Chinese Medical Research Center China Medical University Taichung 404333 Taiwan Division of Gastroenterology Department of Internal Medicine Kaohsiung Armed Forces General Hospital Kaohsiung 802301 Taiwan Institute of Medical Science and Biotechnology National Sun Yat-sen University Kaohsiung 804201 Taiwan Division of Urology Department of Surgery Kaohsiung Armed Forces General Hospital Kaohsiung 802301 Taiwan Department of Marine Biotechnology and Resources National Sun Yat-sen University Kaohsiung 804201 Taiwan Research Center for Chinese Herbal Medicine Graduate Institute of Healthy Industry Technology College of Human Ecology Chang Gung University of Science and Technology Taoyuan 333324 Taiwan Graduate Institute of Natural Products College of Medicine Chang Gung University Taoyuan 333323 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City 243303 Taiwan Chinese Medicine Research and Development Center China Medical University Hospital Taichung 404394 Taiwan Graduate Institute of Natural Products Kaohsiung Medical University Kaohsiung 807378 Taiwan Program in Pharmaceutical Biotechnology Fu Jen Catholic University New Taipei City 242062 Taiwan

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The impact of land-use changes and economic losses of paddy field conversion: a case study of Ciampea Sub-district, Bogor Regency, West Java Province

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IOP Conference Series: Earth and Environmental Science 2022年第1期950卷

作者： T Y Fitri S Adiwibowo A E Pravitasari Natural Resources and Environmental Management Graduate Study Program IPB University Jl. Pajajaran IPB Baranangsiang Campus Bogor 16144 Department of Communication Sciences and Community Development IPB University FEMA Building W1 - L2. IPB Dramaga Jl. Kamper Babakan Dramaga Sub-district Bogor Regency 16680 Department of Soil Science and Land Resouces Faculty of Agriculture IPB University Jl. Meranti IPB Dramaga Campus Dramaga Sub-district Bogor Regency 16680 Center for Regional Systems Analysis Planning and Development (CRESTPENT/P4W) LPPM IPB University Jl. Pajajaran IPB Baranangsiang Campus Bogor 16114

The study aims to analyze the land-use changes from paddy fields to non-paddy fields, examine the future sustainability of the paddy fields, and analyze the impact of the paddy fields' conversion on the socio-economic and environmental aspects. The study was carried out at Ciampea Sub-district, Bogor Regency, West Java Province. Conversion of paddy fields was analyzed through visual interpretation of Ciampea Sub-district 2016 and 2019 imageries using GIS software of ArcGIS 10.5. and later was used to measure the average annual conversion rate and predict the future sustainability of the paddy field, and to measure the impact of the land conversion using the economic valuation method (financial analysis and replacement cost approach). The results showed that, first, during the year of 2016 to 2019, the paddy fields in Ciampea Sub-district transformations were dominated by settlements. Second, the conversion rate was relatively high, by 51.45 hectares per annum. Third, the impact of reduction of paddy field area was relatively high: a potential loss of 3,098.06 tons of food crop production. Meanwhile, the cost for replacing the function of flood, erosion, and sedimentation control reached IDR 257.68 billion.

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Managing the invisible threat of microplastics in marine ecosystems: Lessons from coast of the Bay of Bengal

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The Science of the total environment 2023年 889卷 164224页

作者： Al-Nure Mubin Shahoriar Arefin Md Sonir Mia Abu Reza Md Towfiqul Islam A B M Mainul Bari Md Saiful Islam Mir Mohammad Ali Md Abu Bakar Siddique M Safiur Rahman Venkatramanan Senapathi Abubakr M Idris Guilherme Malafaia Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh. Department of Disaster Management Begum Rokeya University Rangpur 5400 Bangladesh Department of Development Studies Daffodil International University Dhaka 1216 Bangladesh. Electronic address: towfiq_dm@brur.ac.bd. Department of Industrial and Production Engineering Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh. Department of Soil Science Patuakhali Science and Technology University Dumki Patuakhali 8602 Bangladesh. Department of Aquaculture Sher - e - Bangla Agricultural University Dhaka 1207 Bangladesh. Institute of National Analytical Research and Service (INARS) Bangladesh Council of Scientific and Industrial Research (BCSIR) Dhanmondi Dhaka 1205 Bangladesh. Analytical Chemistry Laboratory Chemistry Division Atomic Energy Centre Dhaka (AECD) Bangladesh Atomic Energy Commission Dhaka 1000 Bangladesh. Department of Disaster Management Alagappa University Karaikudi Tamilnadu India. Department of Chemistry College of Science King Khalid University Abha 62529 Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha Saudi Arabia. Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil. Electronic address: guilhermeifgoiano@***.

Invisible microplastics (MP) have become a significant problem worldwide in recent years. Although many studies have highlighted the sources, effects, and fate of MPs pollution on various ecosystems in developed countries, there is limited information on MPs in the marine ecosystem along the northeastern coast of the Bay of Bengal (BoB). Coastal ecosystems along the BoB coasts are critical to a biodiverse ecology that supports human survival and resource extraction. However, the multi-environmental hotspots, ecotoxicity effects, transport mechanisms, fates, and intervention measures to control MP pollution initiatives along the BoB coasts have received little attention. Therefore, this review aims to highlight the multi-environmental hotspots, ecotoxicity effects, sources, fates, and intervention measures of MP in the northeastern BoB to understand how MP spreads in the nearshore marine ecosystem. This study critically evaluates the hotspots and ecotoxic effects of pollution from MP on the coastal multi-environment, e.g., soil, sediment, salt, water, and fish, as well as current intervention measures and additional mitigation recommendations. This study identified the northeastern part of the BoB as a hotspot for MP. In addition, the transport mechanisms and fate of MP in different environmental compartments are highlighted, as are research gaps and potential future research areas. Research on the ecotoxic effects of MP on BoB marine ecosystems must be a top priority, given the increasing use of plastics and the presence of significant marine products worldwide. The knowledge gained from this study would inform decision-makers and stakeholders in a way that could reduce the impact of the legacy of micro- and nanoplastics in the area. This study also proposes structural and non-structural measures to mitigate the effects of MPs and promote sustainable management.

关键词： Bay of Bengal coast Marine ecosystem Marine pollution Microplastic Sustainable management

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The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites

arXiv

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arXiv 2024年

作者： Spitzer, Fridolin Kleine, Thorsten Burkhardt, Christoph Hopp, Timo Yokoyama, Tetsuya Abe, Yoshinari Aléon, Jérôme OD. Alexander, Conel M. Amari, Sachiko Amelin, Yuri Bajo, Ken-Ichi Bizzarro, Martin Bouvier, Audrey Carlson, Richard W. Chaussidon, Marc Choi, Byeon-Gak Dauphas, Nicolas Davis, Andrew M. Rocco, Tommaso Di Fujiya, Wataru Fukai, Ryota Gautam, Ikshu Haba, Makiko K. Hibiya, Yuki Hidaka, Hiroshi Homma, Hisashi Hoppe, Peter Huss, Gary R. Ichida, Kiyohiro Iizuka, Tsuyoshi Ireland, Trevor R. Ishikawa, Akira Itoh, Shoichi Kawasaki, Noriyuki Kita, Noriko T. Kitajima, Kouki Komatani, Shintaro Krot, Alexander N. Liu, Ming-Chang Masuda, Yuki Morita, Mayu Moynier, Fréderic Motomura, Kazuko Nakai, Izumi Nagashima, Kazuhide Nguyen, Ann Nittler, Larry Onose, Morihiko Pack, Andreas Park, Changkun Piani, Laurette Qin, Liping Russell, Sara S. Sakamoto, Naoya Schönbächler, Maria Tafla, Lauren Tang, Haolan Terada, Kentaro Terada, Yasuko Usui, Tomohiro Wada, Sohei Wadhwa, Meenakshi Walker, Richard J. Yamashita, Katsuyuki Yin, Qing-Zhu Yoneda, Shigekazu Young, Edward D. Yui, Hiroharu Zhang, Ai-Cheng Nakamura, Tomoki Naraoka, Hiroshi Noguchi, Takaaki Okazaki, Ryuji Sakamoto, Kanako Yabuta, Hikaru Abe, Masanao Miyazaki, Akiko Nakato, Aiko Nishimura, Masahiro Okada, Tatsuaki Yada, Toru Yogata, Kasumi Nakazawa, Satoru Saiki, Takanao Tanaka, Satoshi Terui, Fuyuto Tsuda, Yuichi Watanabe, Sei-Ichiro Yoshikawa, Makoto Tachibana, Shogo Yurimoto, Hisayoshi Max Planck Institute for Solar System Research Justus-von-Liebig-Weg 3 Göttingen37077 Germany Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo152-8551 Japan Graduate School of Engineering Materials Science and Engineering Tokyo Denki University Tokyo120-8551 Japan Institut de Minéralogie de Physique des Matériaux et de Cosmochimie Sorbonne Université Museum National d'Histoire Naturelle CNRS UMR 7590 IRD Paris75005 France Earth and Planets Laboratory Carnegie Institution for Science WashingtonDC20015 United States McDonnell Center for the Space Sciences and Physics Department Washington University 35 St. LouisMO63130 United States Geochemical Research Center The University of Tokyo Tokyo113-0033 Japan Guangzhou Institute of Geochemistry Chinese Academy of Sciences GD Guangzhou510640 China Departement of Natural History Sciences Hokkaido University Sapporo001-0021 Japan Centre for Star and Planet Formation Globe Institute University of Copenhagen Copenhagen1350 Denmark Bayerisches Geoinstitut Universität Bayreuth Bayreuth95447 Germany Université Paris Cité Institut de Physique du Globe de Paris CNRS Paris75005 France Department of Earth Science Education Seoul National University Seoul08826 Korea Republic of Department of the Geophysical Sciences Enrico Fermi Institute The University of Chicago 5734 South Ellis Avenue Chicago60637 United States Faculty of Geosciences and Geography University of Göttingen GöttingenD-37077 Germany Faculty of Science Ibaraki University Mito310-8512 Japan ISAS/JSEC JAXA Sagamihara252-5210 Japan Research Center for Advanced Science and Technology The University of Tokyo Tokyo153-8904 Japan Research Institute for Marine Resources Utilization Japan Agency for Marine-Earth Science and Technology Kanagawa237-0061 Japan Departement of Earth and Planetary Sciences Nagoya University Nagoya464-8601 Japan Osaka Application Laboratory SBUWDX Rigaku Corporation Osaka569-1

The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies. The CI chondrites incorporated these grains more efficiently, possibly because they formed at the end of the disk’s lifetime, when planetesimal formation was also triggered by photoevaporation of the disk. Isotopic variations among carbonaceous chondrites may thus reflect fractionation of distinct dust components from a common reservoir, implying CI chondrites/Ryugu may have formed in the same region of the accretion disk as other carbonaceous chondrites. © 2024, CC BY.

关键词： Nickel

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Erratum to “Assessing background levels of trace elements in soils of Mato Grosso (Brazil) for environmental and food security” [CATENA 244 (2024) 108267]

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CATENA 2025年 248卷

作者： F.L. Silva M.H. Martins e Silva J.B. Veiga A.C.S. Silva M.A.C. Carvalho O.L.S. Weber E.S. Eguchi M. López-Alonso E.S. Oliveira-Júnior L.R.G. Guilherme M.A.P. Pierangeli Department of Education Federal Institute of Mato Grosso Alta Floresta 78580-000 MT Brazil Department of Biology University of Mato Grosso State Alta Floresta MT 78580-000 Brazil Amazon Environmental Research Institute (IPAM) Canarana MT 78640-000 Brazil Department of Agronomy University of Mato Grosso State Alta Floresta MT 78580-000 Brazil Department of Soils and Rural Engineering Federal University of Mato Grosso Cuiabá 78060-900 MT Brazil Department of Animal Science University of Mato Grosso State Pontes e Lacerda MT 78250-000 Brazil Department of Animal Pathology University of Santiago de Compostela Lugo 27002 Spain Center of Ethnoecology Limnology and Biodiversity Laboratory of Ichthyology of the Pantanal North Graduate Program of Water Resources Management and Regulation and of Environmental Science University of Mato Grosso State Cáceres MT 78200-000 Brazil Department of Soil Science School of Agriculture Federal University of Lavras (ESAL-UFLA) Lavras MG 37203-202 Brazil Department of Animal Science Postgraduate Program of Environmental Science University of Mato Grosso State Pontes e Lacerda MT 78250-000 Brazil

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Spatial Analysis of the Soil Carbon Sequestration Potential of Crop-residue Return in China Based on Model Simulation

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Journal of resources and Ecology 2019年第2期10卷 184-195页

作者： CHEN Jinghua WANG Shaoqiang XU Xiyan SUN Leigang Key Laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Beijing 100101China College of Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China School of Geography and Information Engineering China University of Geosciences Wuhan 430074 China Ecosystems Services and Management Program International Institute for Applied Systems Analysis Laxenburg A-2361 Austria Key Laboratory of Regional Climate-Environment for East Asia Institute of Atmospheric Physics Beijing 100029 China Hebei Engineering Research Center for Geographic Information Application Institute of Geographical Sciences Hebei Academy of SciencesShijiazhuang 050011 China

Crop-residue return is a recommended practice for soil and nutrient management and is important in soil organic carbon(SOC)sequestration and CO2 *** applied a process-based Environmental Policy Integrated Climate(EPIC)model to simulate the spatial pattern of topsoil organic carbon changes from 2001 to 2010under 4 crop-residue return scenarios in *** carbon loss(28.89 Tg yr–1)with all crop-residue removal(CR0%)was partly reduced by 22.38 Tg C yr–1 under the status quo CR30%(30% of crop-residue return).The topsoil in cropland of China would become a net carbon sink if the crop-residue return rate was increased from 30%to 50%,or even 75%.The national SOC sequestration potential of cropland was estimated to be 25.53 Tg C yr–1 in CR50%and 52.85 Tg C yr–1 in CR75%,but with high spatial variability across *** highest rate of SOC sequestration potential in density occurred in Northwest and North China while the lowest was in East *** in North China tended to have stronger regional SOC sequestration potential in *** the decade,the reduced CO2 emissions from enhanced topsoil carbon in CR50%and CR75% were equivalent to 1.4% and 2.9%of the total CO2 emissions from fossil fuels and cement production in China,*** conclusion,we recommend encouraging farmers to return crop-residue instead of burning in order to improve soil properties and alleviate atmospheric CO2 rises,especially in North China.

关键词： cropland crop-residue return soil carbon sequestration spatial pattern EPIC model

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