检索结果-南通市图书馆

Integrating a model with remote sensing observations by a data assimilation approach to improve the model simulation accuracy of carbon flux and evapotranspiration at two flux sites

引用

Science China Earth Sciences 2016年第2期59卷 337-348页

作者： ZHANG TingLong SUN Rui PENG ChangHui ZHOU GuoYi WANG ChunLing zhu qiuan YANG YanZheng College of Resources and Environmental Science Northwest A&F University Laboratory of Ecosystems Forecasting and Global Change College of Forestry Northwest A&F University State Key Laboratory of Remote Sensing Science Co-sponsored by Beijing Normal University and IRSA School of Geography and Remote Sensing Sciences Beijing Normal University Institute of Environment Sciences Department of Biological Sciences University of Quebec at Montreal South China Botanical Garden Chinese Academy of Sciences

Model simulation and in situ observations are often used to research water and carbon cycles in terrestrial ecosystems, but each of these methods has its own advantages and limitations. Combining these two methods could improve the accuracy of quantifying the dynamics of the water and carbon fluxes of an ecosystem. Data assimilation is an effective means of integrating modeling with in situ observation. In this study, the ensemble Kalman filter(En KF) and the unscented Kalman filter(UKF) algorithms were used to assimilate remotely sensed leaf area index(LAI) data with the Biome-BGC model to simulate water and carbon fluxes at the Harvard Forest Environmental Monitoring Site(EMS) and the Dinghushan site. After MODIS LAI data from 2000–2004 were assimilated into the improved Biome-BGC model using the En KF algorithm at the Harvard Forest site, the R2 between the simulated and observed results for NEE and evapotranspiration increased by 7.8% and 4.7%, respectively. In addition, the sum of the absolute error(SAE) and the root mean square error(RMSE) of NEE decreased by an average of 21.9% and 26.3%, and the SAE and RMSE of evapotranspiration decreased by 24.5% and 25.5%, respectively. MODIS LAI data of 2003 were assimilated into the Biome-BGC model for the Dinghushan site, and the R2 values between the simulated and observed results for NEE and evapotranspiration were increased by 6.7% and 17.3%, respectively. In addition, the SAE values of NEE and ET were decreased by 11.3% and 30.7%, respectively, and the RMSE values of NEE and ET decreased by 10.1% and 30.9%, respectively. These results demonstrate that the accuracy of carbon and water flux simulations can be effectively improved when remotely sensed LAI data are properly integrated with ecosystem models through a data assimilation approach.

关键词： Net ecosystem exchange Ensemble Kalman filter Unscented Kalman filter Biome-BGC model Leaf area index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nitrous oxide emissions from three temperate forest types in the Qinling Mountains,China

引用

Journal of Forestry Research 2019年第4期30卷 1417-1427页

作者： Wei Xue Changhui Peng Huai Chen Hui Wang qiuan zhu Yanzheng Yang Junjun Zhang Wanqin Yang Institute of Ecology and Forestry Sichuan Agricultural UniversityChengdu 611130People's Republic of China Laboratory for Ecological Forecasting and Global Change College of ForestryNorthwest A&F UniversityYangling 712100People's Republic of China Department of Biology Sciences Institute of Environment SciencesUniversity of Quebec at MontrealCase Postale 888&Succursale Centre-VilleMontreal H3C 3P&Canada Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041People's Republic of China

To understand soil N2O fluxes from temperate forests in a climate-sensitive transitional zone,N2O emissions from three temperate forest types(Pinus tabulaeformis,PTT;Pinus armandii,PAT;and Quercus aliena ***,QAT)were monitored using the static closed-chamber method from June 2013 to May 2015 in the Huoditang Forest region of the Qinling Mountains,*** results showed that these three forest types acted as N2O sources,releasing a mean combined level of 1.35±0.56 kg N2O ha^-1 a^-1,ranging from0.98±0.37 kg N2O ha^-1 a^-1 in PAT to 1.67±0.41 kg N2O ha^-1 a^-1 in QAT.N2O emission fluctuated seasonally,with highest levels during the summer for all three forest types.N2O flux had a significantly positive correlation with soil temperature at a depth of 5 cm or in the water-filled pore space,where the correlation was stronger for temperature than for the water-filled pore space.N2O flux was positively correlated with available soil nitrogen in QAT and *** results indicate that N2O flux is mainly controlled by soil temperature in the temperate forest in the Qinling Mountains.

关键词： Forest types Greenhouse gases N2O fluxes Qinling Mountains Soil temperature

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Qinghai-tibetan plateau peatland sustainable utilization under anthropogenic disturbances and climate change

引用

Ecosystem Health and Sustainability 2017年第3期3卷 28-38页

作者： Gang Yang Changhui Peng Huai Chen Faqin Dong Ning Wu Yanzheng Yang Yao Zhang Dan zhu Yixin He Shengwei Shi Xiaoyang Zeng Tingting Xi Qingxiang Meng qiuan zhu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling712100 China School of Life Science and Engineering Southwest University of Science and TechnologyMianyang621010 China Department of Biological Sciences Institute of Environmental SciencesUniversity of Quebec at MontrealMontrealQuebec C3H 3P8 Canada CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu610041 China Zoige Peatland and Global Change Research Station Chengdu Institute of BiologyChinese Academy of SciencesHong yuan624400 China Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyang621010 China Department of Microbiology and Plant Biology Center for Spatial AnalysisUniversity of OklahomaNormanOklahoma 73019 USA Department of Landscape Architecture Sichuan College of Architectural TechnologyDeyang61800 China College of Economics Heilongjiang Institute of TechnologyHarbinHeilongjiang 150050 China College of Resources and Environmental Science Henan Agricultural UniversityZhengzhouHenan 450002 China

Often referred to as the“Third Pole,”China’s Qinghai-Tibetan Plateau developed large amounts of peatland owing to its unique alpine *** a renewable resource,peat helps to regulate the climate as well as performing other important ***,in recent years,intensifying climate change and anthropogenic disturbances have resulted in peatland degradation and consequently made sustainable development of peatland more *** review summarizes peatland ecological and economic functions,including carbon sequestration,biodiversity conservation,energy supplies,and *** identifies climate change and anthropogenic disturbances as the two key factors attributing to peatland degradation and ecosystem carbon *** problems in environmental degradation and future challenges in peatland management under the effects of global warming are also discussed and highlighted.

关键词： climate change mitigation peatland management renewable resource sustainable development

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Towards a paradigm for open and free sharing of scientific data on global change science in China

引用

Ecosystem Health and Sustainability 2016年第5期2卷 19-26页

作者： Changhui Peng Xinzhang Song Hong Jiang qiuan zhu Huai Chen Jing MChen Peng Gong Chang Jie Wenhua Xiang Guirui Yu Xiaolu Zhou Laboratory for Ecological Forecasting and Global Change College of ForestryNorthwest Agriculture and Forest UniversityYangling712100 China Department of Biology Sciences Institute of Environmental SciencesUniversity of Quebec at Montreal(UQAM)Case Postale 8888Succursale Centre-VilleMontrealQuebec H3C 3P8 Canada The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin’an311300 China International Institute for Earth System Science Nanjing UniversityHankou Road 22Nanjing210093 China Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu610041 China Department of Geography University of Toronto100 St.George StreetTorontoOntario M5S 3G3 Canada Ministry of Education Key Laboratory for Earth System Modeling Center for Earth System ScienceTsinghua UniversityBeijing100084 China College of Life Sciences Zhejiang University388 Yuhangtang RoadHangzhou310058 China Faculty of Life Science and Technology Central South University of Forestry and TechnologyChangsha410004 China Institute of Geographic Science and Natural Resources Research Chinese Academy of ScienceBeijing100101 China

Despite great progress in data sharing that has been made in China in recent decades,cultural,policy,and technological challenges have prevented Chinese researchers from maximizing the availability of their data to the global change science *** achieve full and open exchange and sharing of scientific data,Chinese research funding agencies need to recognize that preserva-tion of,and access to,digital data are central to their mission,and must support these tasks *** Chinese government also needs to develop better mechanisms,incentives,and rewards,while scientists need to change their behavior and culture to recognize the need to maximize the usefulness of their data to society as well as to other *** Chinese research communi-ty and individual researchers should think globally and act personally to promote a paradigm of open,free,and timely data sharing,and to increase the effectiveness of knowledge development.

关键词： China data sharing global change science policy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于SWAT模型的岷江上游干旱河谷区水文特征情景模拟研究

引用

干旱区资源与环境 2010年第8期24卷 79-84页

作者：梁小军江洪王可朱求安南京大学国际地球系统科学研究所南京210093 浙江林学院国际生态中心杭州311300

分布式流域水文模型SWAT(Soil and Water Assessment Tool)在土地利用/覆盖变化的水文响应研究领域得到了广泛运用,利用紫坪铺站与沙坝站实测流量数据对模型进行校准与验证。紫坪铺站校准期与验证期的ENS值分别为0.74、0.66,沙坝水文站... 详细信息

分布式流域水文模型SWAT(Soil and Water Assessment Tool)在土地利用/覆盖变化的水文响应研究领域得到了广泛运用,利用紫坪铺站与沙坝站实测流量数据对模型进行校准与验证。紫坪铺站校准期与验证期的ENS值分别为0.74、0.66,沙坝水文站校准期与验证期的ENS值分别为0.66、0.61。在黑水河下游流域建立三种干旱河谷扩大的情景模式,利用率定好的参数,模拟1978-1987年气象条件下的水文响应特征,结果显示干旱河谷区面积扩大导致径流输出值减小,同时引起蒸散发的增加,径流与蒸散发存在显著的负相关性。

关键词：土地利用/覆盖变化干旱河谷岷江上游情景模拟 SWAT

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

黄河流域植被格局变化对水分利用效率的影响

引用

生态学报 2023年第8期43卷 3103-3115页

作者：王乐朱求安张江刘佳朱超凡瞿莉莎河海大学水文水资源学院南京210009 国家地球系统科学数据中心国家科技基础条件平台北京100101 西北农林科技大学林学院生态预测与全球变化研究中心杨凌712100

黄河流域横跨3个气候带,是全球人类活动最为强烈的地区之一,特殊的地理位置和复杂的下垫面导致其碳-水循环过程较为复杂。研究黄河流域碳水循环不仅是区域水资源利用的基础,也是实现气候变化条件下双碳目标的关键。水分利用效率(WUE)作... 详细信息

黄河流域横跨3个气候带,是全球人类活动最为强烈的地区之一,特殊的地理位置和复杂的下垫面导致其碳-水循环过程较为复杂。研究黄河流域碳水循环不仅是区域水资源利用的基础,也是实现气候变化条件下双碳目标的关键。水分利用效率(WUE)作为表征碳水过程的重要指标,可用于反映生态系统碳水耦合规律及其相互作用关系。基于此,利用全球陆表特征参量数据(GLASS)的净初级生产力(NPP)和蒸散(ET)产品以及中国逐年土地利用与覆盖数据集(CLUD-A),分析了黄河流域植被格局变化背景下WUE在1990—2018年的时空变化特征及其驱动力。结果表明:(1)黄河流域全域WUE在29 a的均值处在0.18—1.53 g C/kg H_(2)O之间,存在明显的空间异质性,上游地区WUE明显高于中下游地区,分别在0.66—0.92 g C/kg H_(2)O和0.43—0.62 g C/kg H_(2)O之间波动,二者均存在波动上升态势。(2)黄河流域全域WUE在以2000年为中间点的10 a的增速达到近29 a的峰值,流域植被格局变化所带来的流域内NPP与ET变化速率的异步性主导了WUE变化的空间异质性,其中81.10%的区域中WUE所呈现的增加趋势是由NPP增速高于ET增速所导致。(3)黄河流域全域WUE在未来会继续保持增加态势,且上游WUE增加的持续性强于中下游地区。

关键词：碳水耦合蒸散净初级生产力植被结构赫斯特指数

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

基于多源数据的近40年黄河上游地区草地变化特征

引用

草业科学 2023年第2期40卷 405-418页

作者：刘佳朱求安王乐张江朱超凡瞿莉莎河海大学水文水资源学院江苏南京210098 国家地球系统科学数据中心国家科技基础条件平台北京100101 西北农林科技大学林学院陕西杨凌712100

草地不仅是黄河上游畜牧业发展的关键依托,而且其变化会对黄河上游水源涵养能力产生深远影响。探究黄河上游近40年草地植被的时空变化规律和突变特征,对其草地生态系统的治理和保护具有重要现实意义。本研究首先从13个常见的土地利用/... 详细信息

草地不仅是黄河上游畜牧业发展的关键依托,而且其变化会对黄河上游水源涵养能力产生深远影响。探究黄河上游近40年草地植被的时空变化规律和突变特征,对其草地生态系统的治理和保护具有重要现实意义。本研究首先从13个常见的土地利用/土地覆盖(LULC)数据集中,提取了黄河上游地区的草地面积进行精度评价,再对精度最高的LULC数据集以及NDVI数据集,应用趋势分析法、累积距平法、M-K突变检验法和BFAST法分析黄河上游草地面积和NDVI的趋势变化和突变特征。结果表明:1)不同的LULC数据集在黄河上游区域表现出较大的差异性,其中CLUD-A数据集可以较为真实地反映黄河上游草地面积的变化特征。2)近40年间,黄河上游草地总面积呈现非显著(P>0.05)减小趋势;空间栅格尺度上,草地面积在黄河上游93.6%的区域保持不变,在西部和东部的少部分区域呈现减小趋势;5.4%区域的草地面积发生突变,且70%以上突变区域在突变后保持减小趋势;2001年是草地面积突变的关键年份。3)针对NDVI的分析显示,在黄河上游草地分布区域中,50.1%的区域呈现NDVI显著(P<0.05)增加趋势,集中在黄河上游的东北部、东南部和西南部地区;10.9%区域的NDVI发生突变,且75%的突变区域在突变后呈现增长趋势,2005年是NDVI突变的时间节点。综上可知,近40年间,在人类活动和气候变化的综合影响下,黄河上游西部和东部部分地区的草地面积和NDVI趋势变化较为明显,2001-2005年是两者突变的关键时间段;整体而言,黄河上游地区的草地面积呈现非显著减小趋势,草地生长状态往好的方向发展。

关键词：黄河上游多源LULC NDVI BFAST Mann-Kendall 草地面积变化特征草地生长状态

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Terrestrial Ecosystem Modeling with IBIS:Progress and Future Vision

引用

Journal of Resources and Ecology 2022年第1期13卷 2-16页

作者： LIU Jinxun LU Xuehe zhu qiuan YUAN Wenping YUAN Quanzhi ZHANG Zhen GUO Qingxi DEERING Carol U.S.Geological Survey Western Geographic Science CenterMoffett FieldCA 94035USA School of Geography Science and Geomatics Engineering Suzhou University of Science and TechnologySuzhouJiangsu 215009China College of Hydrology and Water Resources Hohai UniversityNanjing 210024China School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275China College of Geography and Resources Sciences Sichuan Normal UniversityChengdu 610068China Department of Geographical Sciences University of MarylandCollege ParkMD 20742USA School of Forestry Northeast Forestry UniversityHarbin 150040China KBR Inc. contractor to the U.S.Geological SurveyEarth Resources Observation and Science(EROS)CenterSioux FallsSD 57198USA

Dynamic Global Vegetation Models(DGVM)are powerful tools for studying complicated ecosystem processes and global *** review article synthesizes the developments and applications of the Integrated Biosphere Simulator(IBIS),a DGVM,over the past two *** has been used to evaluate carbon,nitrogen,and water cycling in terrestrial ecosystems,vegetation changes,land-atmosphere interactions,land-aquatic system integration,and climate change *** we summarize model development work since IBIS v2.5,covering hydrology(evapotranspiration,groundwater,lateral routing),vegetation dynamics(plant functional type,land cover change),plant physiology(phenology,photosynthesis,carbon allocation,growth),biogeochemistry(soil carbon and nitrogen processes,greenhouse gas emissions),impacts of natural disturbances(drought,insect damage,fire)and human induced land use changes,and computational *** also summarize IBIS model applications around the world in evaluating ecosystem productivity,carbon and water budgets,water use efficiency,natural disturbance effects,and impacts of climate change and land use change on the carbon *** on this review,visions of future cross-scale,cross-landscape and cross-system model development and applications are discussed.

关键词： IBIS ecological model productivity carbon cycle global change

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

植物功能性状对动态全球植被模型改进研究进展

引用

科学通报 2018年第25期63卷 2599-2611页

作者：杨延征王焓朱求安温仲明彭长辉林光辉清华大学地球系统科学系、地球系统数值模拟教育部重点实验室北京100084 全球变化与中国绿色发展协同创新中心北京100875 西北农林科技大学林学院生态预测与全球变化研究中心杨凌712100 中国科学院水利部水土保持研究所杨凌712100 Department of Biological Sciences Institute of Environmental SciencesUniversity of Quebec at MontrealMontreal H3C 3P8Canada 清华大学深圳研究生院海洋科学与技术学部深圳518055

动态全球植被模型(dynamic global vegetation models,DGVMs)在模拟和预测陆地生态系统对气候变化响应中表现出很大的不确定性,重要原因之一在于动态全球植被模型将定义植物功能型的性状值设置为常数,忽略了植物功能性状对环境变化的响... 详细信息

动态全球植被模型(dynamic global vegetation models,DGVMs)在模拟和预测陆地生态系统对气候变化响应中表现出很大的不确定性,重要原因之一在于动态全球植被模型将定义植物功能型的性状值设置为常数,忽略了植物功能性状对环境变化的响应.动态全球植被模型现有的植物功能型框架已经严重地阻碍了其发展,因此迫切需要一种新的方法来克服这种局限性.植物功能性状不仅可以反映植物对环境连续变化的响应,而且与生态系统的结构和功能密切相关,可提升当前动态全球植被模型对生态系统过程的模拟和功能的预测.本文从动态全球植被模型发展和植物功能型局限性入手,详细介绍了植物功能性状发展现状及其对动态全球植被模型改进的重要价值,归纳总结了植物功能性状对动态全球植被模型改进的主要方法,并指明植物功能性状对动态全球植被模型改进的发展方向.以期通过凝练植物功能性状在构建下一代动态全球植被模型中发挥作用,推动动态全球植被模型在我国的发展和应用.

关键词：动态全球植被模型(DGVMs) 植物功能型植物功能性状模型改进

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

1960-2020年中国1公里分辨率月降水数据集

引用

中国科学数据（中英文网络版） 2023年第2期8卷 281-292页

作者：瞿莉莎朱求安朱超凡张江河海大学水文水资源学院南京210000 国家地球系统科学数据中心国家科技基础条件平台北京100101 西北农林科技大学林学院生态预测与全球变化研究中心陕西杨凌712100

降水数据具有较高的理论研究与实践应用价值,已广泛应用于水文预报、农业生产以及生态保护等领域。我国地域辽阔,地形起伏变化较大,而气象站点多集中于人口密集的平原区域。山区等部分地区站点密度较小,缺少降水观测资料。因此利用插值... 详细信息

降水数据具有较高的理论研究与实践应用价值,已广泛应用于水文预报、农业生产以及生态保护等领域。我国地域辽阔,地形起伏变化较大,而气象站点多集中于人口密集的平原区域。山区等部分地区站点密度较小,缺少降水观测资料。因此利用插值方法建立高精度的降水数据集很有必要。本数据集基于1960–2020年全国地面2400多个气象站点的降水监测数据,利用气候数据空间插值软件ANUSPLIN4.4计算得到全国1 km空间分辨率逐月降水插值数据集。将本数据集与所收集的中国地区降水实测数据和中国水文年鉴降雨数据进行验证,结果表明,本数据集具有精度高、分辨率高、时序长等特点,具备更优的科学研究与应用潜力。

关键词：降水插值中国

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：