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Global mapping of volumetric water retention at 100,330 and 15000 cm suction using the WoSIS database

International Soil and Water Conservation Research 2023年第2期11卷 225-239页

作者： Maria Eliza Turek Laura Poggio Niels H.Batjes Robson Andre Armindo Quirijn de Jong van Lier Luis de Sousa Gerard B.M.Heuvelink isric-world soll information Wageningemthe Netherlands Graduate Program in Environmental Engineering Federal University of ParunaCurtibaR Brazil soll Geography and Landscope Group Wageningen University Wageningenthe Netherlands Department of Physics Federul University of LavrasMGBrarll CENA-Universiy of Sao Poulo PinacicabasaoBrazil

Present global maps of soil water retention(SWR)are mostly derived from pedotransfer functions(PTFs)applied to maps of other basic soil *** an alternative,'point-based'mapping of soil water content can improve global soil data availability and *** developed point-based global maps with estimated uncertainty of the volumetric SWR at 100,330 and 15000 cm suction using measured SWR data extracted from the WoSIS Soil Profile Database together with data estimated by a random forest PTF(PTF-RF).The point data was combined with around 200 environmental covariates describing vegetation,terrain morphology,climate,geology,and hydrology using *** total,we used 7292,33192 and 42016 SWR point observations at 100,330 and 15000 cm,respectively,and complemented the dataset with 436108 estimated values at each *** cross-validation yielded a Root Mean Square Error(RMSE)of6380,7.112 and 6.48510^(-2)cm^(3)cm^(-3),and a Model Efficiency Coefficient(MEC)of0.430,0386,and 0.471,respectively,for 100,330 and 15000 *** results were also compared to three published global maps of SWR to evaluate differences between point-based and map-based mapping ***-based mapping performed better than the three map-based mapping approaches for 330 and 15000 cm,while for 100 cm results were similar,possibly due to the limited number of SWR observa-tions for 100 *** sources or uncertainty identified included the geographical clustering of the data and the limitation of the covariates to represent the naturally high variation of SWR.

关键词： Digital soil mapping Soil hydraulic properties Pedometrics SoilGrids

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Making More Food Available:Promoting Sustainable Agricultural Production

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Journal of Integrative Agriculture 2012年第1期11卷 1-8页

作者： Rudy Rabbinge Prem S Bindraban Food Security and Sustainable Development isric-world Soil information Plant Research International

During the 20th century food availability worldwide has increased considerably. The increase in population was outnumbered by the productivity increase in agriculture mainly by higher yields per ha. Globally there is more food available per person than ever before. In the coming decades the world population will further increase and diets will change requiring a doubling of plant production worldwide by 2050. Especially the increase in demand will be substantial in Asia and snb-Saharan Africa.

关键词：农业生产率食物世界人口粮食供应全球范围饮食

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深水人工湖环境生物地球化学过程研究：以贵州红枫湖-百花湖为例

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地球与环境 2010年第3期38卷 262-270页

作者：万国江万恩源陈敬安 WanXi BaiZG 吴丰昌王仕禄王敬富中国科学院地球化学研究所环境地球化学国家重点实验室贵阳550002 Nijmegen Centre for Molecular Life Sciences (NCMLS) Radboud Universiteit Nijmegen 6500 HB Nijmegenthe Nettierlands isric-world Soil information 6700 AJ Wageningen the Netherlands 中国环境科学研究院北京100012

红枫湖和百花湖地处长江支流乌江水系猫跳河流域,位于黔中人为活动高强度地区,具低纬度-高海拔的地理区位;是河道型梯级开发的人工湖,具碳酸盐岩的地质背景、水寄宿时间小、水深变幅大、水体多功能、农区与覆水区镶嵌等重要特征。红枫... 详细信息

红枫湖和百花湖地处长江支流乌江水系猫跳河流域,位于黔中人为活动高强度地区,具低纬度-高海拔的地理区位;是河道型梯级开发的人工湖,具碳酸盐岩的地质背景、水寄宿时间小、水深变幅大、水体多功能、农区与覆水区镶嵌等重要特征。红枫湖表层沉积物Pb稳定同位素组成表明其污染具多源特征;剖析百花湖-红枫湖"突发性"水质恶化相互关联水质指标表明"湖泊黑潮"是特定季节、特殊气候条件下,沉积有机质生物氧化作用的耦合;脱氮过程受阻的pH控制导致亚硝酸根浓度增高;维护该湖泊水系环境质量需预防工业污染、流域侵蚀、生活污染并综合治理湖区。

关键词：深水人工湖沉积物-水界面环境生物地球化学过程红枫湖百花湖

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黔中气溶胶传输的^210Pb和^7Be示踪：Ⅰ.周时间尺度的解释

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地球科学进展 2010年第5期25卷 492-504页

作者：万国江郑向东 Lee H N Bai Z G 万恩源王仕禄杨伟苏菲汤洁王长生黄荣贵刘鹏中国科学院地球化学研究所环境地球化学国家重点实验室贵州贵阳550002 中国气象科学研究院北京100081 Environmental Measurements Laboratory New York NY10014-7447 USA isric-world Soil information Wageningen 6700 A J the Netherlands 贵州省气象局贵州贵阳550002 中国大气本底基准观象台青海西宁810001

认识环境核素在不同地域空气中的浓度分布和沉降到地表环境的通量对气溶胶污染物全球扩散模型的建立和验证、沉积过程示踪和沉积计年、流域侵蚀示踪参比,以及生态系统受天然辐照的评价等多个领域都是关键的依据。自2001年以来在贵阳观... 详细信息

认识环境核素在不同地域空气中的浓度分布和沉降到地表环境的通量对气溶胶污染物全球扩散模型的建立和验证、沉积过程示踪和沉积计年、流域侵蚀示踪参比,以及生态系统受天然辐照的评价等多个领域都是关键的依据。自2001年以来在贵阳观风山等地逐周连续采样,对近地面空气和降水中210Pb和7Be浓度的观测结果表明:①因气象条件变化,近地面空气210Pb和7Be周浓度具有2～6周变幅不等的短周期波动。210Pb空气浓度在年内的总趋势呈现出受气温变化的总体影响和降水的短暂调控;而7Be空气浓度出现连续不断的峰—谷交替。②两核素在近地面空气周浓度的低值同步,210Pb/7Be比率较高(≥0.8),显示出海洋性贫210Pb-7Be气团的入侵影响;它们高的周浓度也同步耦合,比率较低(≤0.7),显示出高层大气富7Be气团的输入。③210Pb和7Be的周降水浓度及水—气分配系数在秋末～春季较高,而春末—秋季明显偏低。周降水浓度随同期空气浓度呈增高趋势,其季节分界分别为0.2Bq/L和1Bq/L;而Kd值随同期空气浓度增大呈降低趋势。210Pb和7Be的降水沉降主要分布在每年的春夏季;周沉降量随同期降水量呈增大趋势,7Be增大的斜率约为210Pb的3倍;当近于零降水时,它们在降水中的初始比率约为2.5。它们出现高或者较高的周降水沉降都伴随当周或邻周空气浓度的急剧下降;降水中210Pb/7Be比率主要分布在≤0.5,并与空气中210Pb/7Be比率基本同步,显示出两核素被降水清洗的效率基本相近。④2008年冰冻极端天气过程中,210Pb-7Be空气浓度同步低谷并存在气溶胶低浓度与高比活度耦合。⑤观风山7Be周空气浓度显示低纬度、较高海拔地区的预期水平;短周期波动反映强下沉气流和低海拔上升气团影响分别在观风山和瓦里关山的滞后性。

关键词：气溶胶传输 210Pb-7Be 周时间尺度观风山瓦里关山

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The Land- Potential Knowledge System (LandPKS): mobile apps and collaboration for optimizing climate change investments

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Ecosystem Health and Sustainability 2016年第3期2卷 31-38页

作者： Jeffrey E.Herrick Adam Beh Edmundo Barrios Ioana Bouvier Marina Coetzee David Dent Emile Elias Tomislav Hengl Jason W.Karl Hanspeter Liniger John Matuszak Jason CNeff Lilian Wangui Ndungu Michael Obersteiner Keith D.Shepherd Kevin C.Urama Rik van den Bosch Nicholas P.Webb U.S.Department of Agriculture-Agricultural Research Service New Mexico State UniversityJornada Experimental Range MSC 3JERBox 30003Las CrucesNew Mexico 88003-8003 USA world Agroforestry Centre United Nations AvenueGigiriP.O.Box 30677Nairobi00100Kenya U.S.Agency for International Development 3014th StreetSW SA-44(Rm 848)WashingtonD.C.20024 USA Namibia University of Science and Technology 13 Storch StreetPrivate Bag 13388WindhoekNamibia Merchants of Light Ltd Forncett EndNorfolkEngland isric-world Soil information Droevendaalsesteeg 36708PB WageningenThe Netherlands Center for the development and Environment University of BernHallerstrasse 103012BernSwitzerland U.S.Department of State/OES 2201 C St.NWWashingtonD.C.20520USA Environmental Studies Program University of Colorado at BoulderCampus Box 397BoulderColorado 80309 USA RCMRD SERVIR-Eastern&Southern AfricaP.O.Box 63200618 RuarakaNairobiKenya International Institute for Applied Systems Analysis Schlossplatz 1 A-2361LaxenburgAustria African Development Bank Avenue Jean-Paul II01 BP 1387Abidjan 01Côte d’Ivoire

Massive investments in climate change mitigation and adaptation are projected during coming *** of these investments will seek to modify how land is *** return on both types of investments can be increased through an understanding of land potential:the potential of the land to support primary production and ecosystem services,and its resilience.A Land-Potential Knowledge System(LandPKS)is being developed and implemented to provide individual users with point-based estimates of land potential based on the integration of simple,geo-tagged user inputs with cloud-based information and *** system will rely on mobile phones for knowledge and information exchange,and use cloud computing to integrate,interpret,and access relevant knowledge and information,including local knowledge about land with similar *** system will initially provide management options based on long-term land potential,which depends on climate,to-pography,and relatively static soil properties,such as soil texture,depth,and *** mod-ules will provide more specific management information based on the status of relatively dynamic soil properties such as organic matter and nutrient content,and of *** paper includes a discus-sion of how this system can be used to help distinguish between meteorological and edaphic drought.

关键词： agriculture analytics crowdsourcing expert systems extension knowledge management land evaluation land-use planning mobile apps sustainability sustainable land management

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An Improved Modeling of TDR Signal Propagation for Measuring Complex Dielectric Permittivity

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Journal of Earth Science 2015年第6期26卷 827-834页

作者： Chih-Ping Lin Shr-Hong Tang Chun-Hung Lin Chih-Chung Chung Civil Engineering National Chiao Tung University information Management St.Mary's Medicine Nursing and Management College Disaster Prevention and Water Environment Research Center National Chiao Tung University Civil Engineering National Central University

Time domain reflectometry（TDR） is a measurement technique based upon transmission line theory. The solutions of transmission line equations are reformulated in terms of independent physical properties, instead of coupled per-unit-length circuit parameters. The complete TDR response is effectively modeled by a non-uniform transmission line using the non-recursive ABCD matrix approach. Approaches to calibrate line parameters and perform TDR measurements based upon such model are introduced with an example on dielectric spectroscopy. TDR modeling in terms of decoupled physical parameters and non-recursive algorithm allows more convenient calibration of line parameters and facilitates interpretation of TDR measurements.

关键词： time domain reflectometry transmission line theory transmission line measurements dielectric measurements spectroscopy soll measurements.

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Hand-feel soil texture observations to evaluate the accuracy of digital soil maps for local prediction of soil particle size distribution:A case study in Central France

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Pedosphere 2023年第5期33卷 731-743页

作者： Anne C.RICHER-de-FORGES Dominique ARROUAYS Laura POGGIO Songchao CHEN Marine LACOSTE Budiman MINASNY Zamir LIBOHOVA Pierre ROUDIER Vera LMULDER HervéNÉDÉLEC Guillaume MARTELET Blandine LEMERCIER Philippe LAGACHERIE Hocine BOURENNANE INRAE(Institut national de recherche pour l'agriculture l'alimentation et l'environnement)Info&Sols UnitOrléans 45075France isric(International Soil Reference and information Centre)Wageningen P.O.Box 353Wageningen 6700The Netherlands Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311200China The University of Sydney Sydney Institute of Agriculture.Eveleigh NSW 2015Australia The University of Sydney School of Life and Environmental SciencesEveleigh NSW 2015Australia USDA-ARS(United States Department of Agriculture-Agricultural Research Service) Dale Bumpers Small Farms Research Center6883 S.State Hwy.23Booneville AR 72927USA Landcare Research-Manaaki Whenua Palmerston North 4442New Zealand Soil Geography and Landscape Group Wageningen UniversityP.O.Box 47Wageningen 6700The Netherlands Chambre d'Agriculture du Loiret Orléans F-45000France Bureau de Recherches Géologiques et Minières BP 36009Orléans cedex 2Orléans 45060France UMR SAS(UnitéMixte de Recherche"Sol Agro et hydrosystème Spatialisation")Institut Agro INRAERennes F-35000France UMR LISAH(UnitéMixte de Recherche"Laboratoire d'Etude des Interactions entre Sol-Agrosystème-Hydrosystème") INRAEInstitut AgroIRD(Institut de Recherche pour le Développement)Montpellier F-34000France

Digital maps of soil properties are now widely ***-users now can access several digital soil mapping(DSM)products of soil properties,produced using different models,calibration/training data,and covariates at various spatial scales from global to ***,there is an urgent need to provide easy-to-understand tools to communicate map uncertainty and help end-users assess the reliability of DSM products for use at local *** this study,we used a large amount of hand-feel soil texture(HFST)data to assess the performance of various published DSM products on the prediction of soil particle size distribution in Central *** tested four DSM products for soil texture prediction developed at various scales(global,continental,national,and regional)by comparing their predictions with approximately 3200 HFST observations realized on a 1:50000 soil survey conducted after release of these DSM *** used both visual comparisons and quantitative indicators to match the DSM predictions and HFST *** comparison between the low-cost HFST observations and DSM predictions clearly showed the applicability of various DSM products,with the prediction accuracy increasing from global to regional *** simple evaluation can determine which products can be used at the local scale and if more accurate DSM products are required.

关键词： digital soil mapping products easy-to-understand tool hand-feel observation local use map uncertainty prediction performance spatial extent visual assessment

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