检索结果-南通市图书馆

A review of historical reconstruction methods of land use/land cover

Journal of Geographical Sciences 2014年第4期24卷 746-766页

作者： yang Yuanyuan ZHANG Shuwen yang jiuchun CHANG Liping BU Kun XING Xiaoshi College of Earth Science Jilin University Changchun 130061 China Northeast Institute of Geography and Agroecology CAS Changchun 130102 China Center for International Earth Science Information Network (CIESIN) Columbia University Palisades NY 10964. USA

Understanding long-term human-environment interactions requires historical reconstruction of past land-use and land-cover changes. Most reconstructions have been based primarily on consistently available and relatively standardized information from historical sources. Based on available data sources and a retrospective research, in this paper we review the approaches and methods of the digital reconstruction and analyze their advantages and possible constraints in the following aspects：（1） Historical documents contain qualitative or semi-quantitative information about past land use, which also usually include land-cover data, but preparation of archival documents is very time-consuming. （2） Historical maps and pictures offer visual and spatial quantitative land-cover information. （3） Natural archive has significant advantages as a method for reconstructing past vegetation and has its unique possibilities especially when historical records are missing or lacking, but it has great limits of rebuilding certain land-cover types. （4） Historical reconstruction models have been gradually developed from empirical models to mechanistic ones. The method does not only reconstruct the quantity of land use/cover in historical periods, but it also reproduces the spatial distribution. Yet there are still few historical land-cover datasets with high spatial resolution. （5） Reconstruction method based on multiple-source data and multidisciplinary research could build historical land-cover from multiple perspectives, complement the missing data, verify reconstruction results and thus improve reconstruction accuracy. However, there are challenges that make the method still in the exploratory stage. This method can be a long-term development goal for the historical land-cover reconstruction. Researchers should focus on rebuilding historical land-cover dataset with high spatial resolution by developing new models so that the study results could be effectively applied in simulations of

关键词： review historical reconstruction land use land cover

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

The relationships between land use change and demographic dynamics in western Jilin province

引用

Journal of Geographical Sciences 2015年第5期25卷 617-636页

作者： LI Fei ZHANG Shuwen BU Kun yang jiuchun WANG Qing CHANG Liping College of Earth Science Jilin University Changchun 130061 China Northeast Institute of Geography and Agroecology CAS Changchun 130102 China

Demographic change was thought to although there were several interacting factors be the most major driver of land use change involved, especially in the developing coun- tries. In this paper, we selected western Jilin province in China as the study area to provide a case study for understanding the relationship between spatial-temporal pattern of the land use change and population dynamics from 1975 to 2010. The results showed that the change of farmland area percentage could be modeled well by using a quadratic function, the least area percentage of farmland was 15.4% in areas where the population density was 0 peo- ple/km2, and farmland area percentage had a greatest value of 94.8% when population den- sity was 199.25 people/km2. The area percentage of grassland, water body and wetland de- creased exponentially with population density increased. The relationship between land use degree and population density could be modeled well by using a logistic regression models. Due to economic growth and technological progress and the existence of Hollow Village phenomenon, land use degree still increased in areas where population density was negative growth. In addition, land use dynamics increased exponentially with population density change. Land use relative change of woodland, grassland, built-up land and wetland were proportional to population density change. According to the simulation results of the land use structure and land use degree, Da＇an and Zhenlai had the greatest possibility to be further reclaimed. As sensitive and fragile areas, it was of significance to study environmental pro- tection and ecologic construction on Tongyu and Qian＇an.

关键词： land use change population density change western Jilin

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

Optical tomographic scanning target-tracking system based on single pixel sensor

Optical tomographic scanning target-tracking system based on...

引用

2015光电防御技术学术研讨会

作者： Baosheng Li Yicheng Wang jiuchun yang School of Instrument Science & Opto-electric Engineering Hefei University of Technology

Optical tomography imaging had the characteristics of high resolution. The rotating periscope system and modulating plate with 65 slits were designed. Filter back projection(FBP) algorithm was applied to the one-dimensional signals, which were obtained by multi-angle scanning in modulating plate, to reconstruct two-dimensional image. Single pixel photoelectric sensor has high frequency response and can acquire high speed real-time signal. This work had carried on the simulation and experiment about scanning system based on the analysis and determination about the modulating plate’s parameters, and verify the feasibility of scanning system. In this paper, the method plays an important role in developing novel target tracking system and provides deep foundation for deeper experimental research.

关键词： optical tomography filter back projection target tracking

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Cropland redistribution to marginal lands undermines environmental sustainability

引用

National Science Review 2022年第1期9卷 66-78页

作者： Wenhui Kuang Jiyuan Liu Hanqin Tian Hao Shi Jinwei Dong Changqing Song Xiaoyong Li Guoming Du Yali Hou Dengsheng Lu Wenfeng Chi Tao Pan Shuwen Zhang Rafiq Hamdi Zherui Yin Huimin Yan Changzhen Yan Shixin Wu Rendong Li jiuchun yang Yinyin Dou Wenbin Wu Liqiao Liang Bao Xiang Shiqi yang Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences International Center for Climate and Global Change Research School of Forestry and Wildlife Sciences Auburn University Faculty of Geographical Science Beijing Normal University State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences College of Resources and Environment University of Chinese Academy of Sciences School of Public Administration and Law Northeast Agricultural University School of Geographical Sciences Fujian Normal University School of Resources and Environmental Economics Inner Mongolia University of Finance and Economics School of Geography and Tourism Qufu Normal University Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Royal Meteorological Institute of Belgium Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Key Laboratory for Resources Use & Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Hubei Province’s Key Laboratory for Environment & Disaster Monitoring and Evaluation Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Institute of Ecology Chinese Research Academy of Environmental Sciences College of Environment and Planning Henan University

Cropland redistribution to marginal land has been reported worldwide;however,the resulting impacts on environmental sustainability have not been investigated *** we investigated the environmental impacts of cropland redistribution in *** a result of urbanization-induced loss of high-quality croplands in south China(～8.5 t ha),croplands expanded to marginal lands in northeast(～4.5 t ha) and northwest China(～2.9 t ha) during 1990-2015 to pursue food ***,the reclamation in these low-yield and ecologically vulnerable zones considerably undermined local environmental sustainability,for example increasing wind erosion(+3.47%),irrigation water consumption(+34.42%),fertilizer use(+20.02%) and decreasing natural habitats(-3.11%).Forecasts show that further reclamation in marginal lands per current policies would exacerbate environmental costs by *** future cropland security risk will be remarkably intensified because of the conflict between food production and environmental *** research suggests that globally emerging reclamation of marginal lands should be restricted and crop yield boost should be encouraged for both food security and environmental benefits.

关键词： cropland redistribution environmental sustainability marginal lands wind erosion irrigation water consumption

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于ERA5-LAND的中国东北地区近地表土壤冻融状态时空变化特征

引用

地理学报 2021年第11期76卷 2765-2779页

作者：岳书平闫业超张树文杨久春王文娟南京信息工程大学地理科学学院南京210044 中国科学院东北地理与农业生态研究所长春130102 河南财经政法大学资源与环境学院郑州450046

土壤冻融交替是陆地表层极其重要的物理过程,土壤冻融状态的频繁变化对地气能量交换、地表径流、植被生长、生态系统及土壤碳氮循环等均具有重要的影响。本文基于1981—2019年ERA5-LAND逐小时土壤温度数据,借助GIS空间分析功能,利用Pyt... 详细信息

土壤冻融交替是陆地表层极其重要的物理过程,土壤冻融状态的频繁变化对地气能量交换、地表径流、植被生长、生态系统及土壤碳氮循环等均具有重要的影响。本文基于1981—2019年ERA5-LAND逐小时土壤温度数据,借助GIS空间分析功能,利用Python编程处理分析了中国东北地区近地表土壤冻融状态的时空变化特征。结果表明:从不同冻融状态起始日期的空间分布来看,近地表不同阶段的起始日期主要受纬度和地形的影响,具有明显的纬度地带性和垂直地带性。春季冻融过渡期和完全融化期的起始日期由东南向西北均呈逐渐推迟趋势,而秋季冻融过渡期与完全冻结期起始日期则由东南向西北随纬度升高越来越早。就不同冻融状态发生天数的空间分布而言,研究区南部春季冻融过渡期发生天数多于北部,西部多于东部,年均发生天数均在30 d以内;秋季发生冻融的天数空间差异不大,研究区一半以上的地区年均发生天数在10 d以内。完全融化期发生天数最多,从东南向西北呈逐渐减少趋势,年均发生天数主要介于150~240 d之间;完全冻结期发生天数则由南向北日益增多,其空间分布表现为一向南开口的簸箕形,各地年均发生天数集中于90~180 d之间。从时间变化趋势来看,近年来春季冻融过渡期起始日期以提前趋势为主,而秋季冻融过渡期起始日期总体表现为延后,致使完全融化期发生天数以增加趋势为主,年均变化速度高达0.2 d/a;大兴安岭以西、呼伦贝尔高原以北地区及辽河平原春季冻融过渡期发生天数呈减少趋势,其他地区为增加趋势;大兴安岭以西地区、呼伦贝尔高原以北地区完全融化期起始日期明显提前;松嫩平原和长白山区秋季冻融过渡期起始日期推迟显著,发生天数的变化趋势呈北增南减的空间分异特征;不同地区完全冻结期起始日期的变化趋势差异显著,中部广大的平原区呈不显著的推迟趋势,而大、小兴安岭、长白山、辽东半岛和辽西丘陵则提前进入完全冻结状态;研究区完全冻结期发生天数呈减少趋势,研究区中部的季节冻土区完全冻结期明显变短,年均减少速度大于0.2 d/a。

关键词： ERA5-LAND 土壤冻融状态冻土时空变化东北地区

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

基于地名志的东北历史时期土地利用变化研究——以吉林省镇赉县为例

引用

地球信息科学学报 2010年第2期12卷 174-179页

作者：吕妍张树文杨久春吉林大学地球科学学院长春130061 中国科学院东北地理与农业生态研究所长春130012 中国科学院研究生院北京100049

研究历史时期的土地利用与土地覆被变化,对于人类的生产活动有着重要的借鉴意义。本文以吉林省镇赉县为例,探讨了地名志等历史资料在确定东北地区大规模开发利用初始年限研究中的应用,并结合重分类、重心转移分析、叠加分析方法,分析了... 详细信息

研究历史时期的土地利用与土地覆被变化,对于人类的生产活动有着重要的借鉴意义。本文以吉林省镇赉县为例,探讨了地名志等历史资料在确定东北地区大规模开发利用初始年限研究中的应用,并结合重分类、重心转移分析、叠加分析方法,分析了镇赉县地名志等史料记载的土地开发利用特征。结果表明:在康熙年间和1853年,镇赉县先后有过有记载的定居后小范围开垦活动,而直到1875年开始持续的土地开垦利用,此前镇赉县基本上处于自然状态。在技术手段不发达的早期,村屯的演变过程与土地开发利用过程是相辅相成的,因此,从村屯演变特征来看,1907-1912年期间土地开发利用最为突出;到1975年时,镇赉县村屯格局基本形成,而此时的土地开发利用活动已由个人行为转变为集体的机械化。在开禁等政策、自然灾害,以及战争等影响下,镇赉县土地开发呈由东部和中部的平坦地区向西部地势较高地区扩展的过程。

关键词：地名志历史时期村屯演变土地开发镇赉县

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

Monitoring periodically national land use changes and analyzing their spatiotemporal patterns in China during 2015–2020

引用

Journal of Geographical Sciences 2022年第9期32卷 1705-1723页

作者： KUANG Wenhui ZHANG Shuwen DU Guoming YAN Changzhen WU Shixin LI Rendong LU Dengsheng PAN Tao NING Jing GUO Changqing DONG Jinwei BAO Yuhai CHI Wenfeng DOU Yinyin HOU Yali YIN Zherui CHANG Liping yang jiuchun XIE Jiali QIU Juan ZHANG Hansong ZHANG Yubo yang Shiqi SA Rigai LIU Jiyuan Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China Northeast Institute of Geography and Agroecology CASChangchun130102China Northeast Agricultural University Harbin150030China Northwest Institute of Eco-Environment and Resources CASLanzhou730000China Xinjiang Institute of Ecology and Geography CASUrumqi830011China Innovation Academy for Precision Measurement Science and Technology CASWuhan430071China Fujian Normal University Fuzhou350007China Qufu Normal University RizhaoShandong276826China Inner Mongolia Normal University Hohhot010022China Inner Mongolia University of Finance and Economics Hohhot010070China University of Chinese Academy of Sciences Beijing100049China Jilin University Changchun130000China

High-resolution mapping and monitoring of national land use/cover changes contribute significantly to the knowledge of the interaction between human activities and environmental ***’s Land Use/cover Dataset(CLUD)for 2020 and its dynamic changes in 2015-2020 were developed to extend the CLUD to over 30 years(i.e.,the 1980s to 2020 at 5-year intervals)by integrating remote sensing big data and knowledge-based human-computer interaction interpretation *** integrating method for CLUD 2020 improved the efficiency of national land use/cover mapping and the accuracy of land use pattern change detection compared to earlier CLUD products,with an overall accuracy of 95%.The intensity of land use change decreased across China in 2015-2020 compared to 2010-2015,although both characteristics of its spatial changes were *** cropland area continued to shrink at national scale in 2015-2020,with two regional hotspots including the widespread conversions from dry land into paddy land in Northeast China and the coexistence of widespread land cultivation and cropland abandonment in Xinjiang of Northwest ***-up land area continued to expand in China,showing consistency between 2015-2020 and 2010-2015,in which hotspots transited from the surroundings of coastal megacities to the city surroundings of the central and western *** natural land,although the woodland and grassland decreased in 2015-2020,its magnitude expanded compared to *** comparison,the water body area in Qinghai-Tibet Plateau increased significantly under the continuous impact of climate *** characteristics of land use change were closely related to the development strategy of the top-level design of the 13th Five-Year Plan(2016-2020)(e.g.,ecological civilization construction and high-quality development).

关键词： land use spatial pattern cropland change urban expansion cloud computation remote sensing China

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

不同光照条件对侵蚀沟三维重建精度的影响

引用

水土保持学报 2023年第1期37卷 45-51页

作者：孙欢王让虎杨久春张树文岳书平山西大学黄土高原研究所太原030006 中国科学院东北地理与农业生态研究所长春130102 南京信息工程大学地理科学学院南京210044

为深入探究不同光照条件下无人机重建三维模型精度的差异,在晴天以及阴天条件下,采用无人机摄影技术获得4期数字表面模型,并分别以RTK(real-time kinematic)测量的高程点和三维激光扫描仪获取的数字高程模型为基准,在典型剖面和整个侵蚀... 详细信息

为深入探究不同光照条件下无人机重建三维模型精度的差异,在晴天以及阴天条件下,采用无人机摄影技术获得4期数字表面模型,并分别以RTK(real-time kinematic)测量的高程点和三维激光扫描仪获取的数字高程模型为基准,在典型剖面和整个侵蚀沟2个不同尺度上,分析在不同光照条件下侵蚀沟三维重建的高程精度差异。结果表明:(1)典型剖面尺度上,阴天构建的模型高程精度最高,晴天中午的高程模型精度相较于上午和下午的更高,而剖面阴影区高程误差比非阴影区增加0.138~0.217 m。(2)整个侵蚀沟尺度上,阴天条件下航测的高程模型的均方根误差达到最小仅为0.155 m;对于晴天的不同时段,中午航测所得的DSM高程误差最低,但仍比阴天DSM的高程误差高0.411 m;综合晴天的3期高程模型,阴影区高程误差比非阴影区增加0.250~0.346 m。(3)从不同坡向来看,阳坡的高程误差最低,而阴影面积的增加导致其他坡向误差进一步加大。光照产生的阴影显著降低高程模型精度,研究结果可为基于无人机的侵蚀沟航测制图研究提供参考。

关键词：侵蚀沟光照条件阴影无人机遥感三维重建

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WRF和统计方法的气温空间尺度分析

引用

地球信息科学学报 2013年第4期15卷 546-553页

作者：于灵雪张树文刘廷祥卜坤杨久春中国科学院东北地理与农业生态研究所长春130012 中国科学院大学北京100049

WRF模式作为一个中尺度气候模式,其分辨率从几米到几千公里,其自身的双向嵌套特征也为进行动力尺度下推提供了有力条件。本文利用WRF模式和传统的统计方法对研究区的气温进行尺度下推。首先,通过动力下推得到不同分辨率下的气温空间分布... 详细信息

WRF模式作为一个中尺度气候模式,其分辨率从几米到几千公里,其自身的双向嵌套特征也为进行动力尺度下推提供了有力条件。本文利用WRF模式和传统的统计方法对研究区的气温进行尺度下推。首先,通过动力下推得到不同分辨率下的气温空间分布,并选取15个气象站点进行点对点验证,为了更明显观察不同尺度间的差异,对不同尺度的输出与ANUSPLIN插值结果进行比对,结果显示动力尺度下推中,分辨率越高模拟效果越好。其次,我们采用传统的统计下推方法,从27km下推到3km分辨率,并与WRF和ANUSPLIN插值在该尺度的结果进行对比分析,结果显示统计下推结果的趋势与动力下推的插值结果是一致的,但具有明显的马赛克效果,通过分析认为,这与统计方法的尺度下推只考虑高程信息的变化对气温的影响,而未考虑其他因素有关,如若在下推时加入更多的变量,如对温度有较大影响的坡度、坡向、土地覆被类型等因素,综合分析不同尺度之间的关系,会使下推结果有所改善。

关键词：空间尺度分析统计方法天气预报模式气温尺度下推

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

遥感影像镶嵌中平面剖分模型的应用及实现

引用

国土资源遥感 2017年第4期29卷 225-230页

作者：卜坤王治良王卷乐张树文杨久春于灵雪中国科学院东北地理与农业生态研究所长春130102 齐齐哈尔大学理学院齐齐哈尔161006 中国科学院地理科学与资源研究所北京100101

针对目前遥感商用软件影像镶嵌过程中人工干预过多、自动化程度不高和不易修改等问题,提出了基于平面剖分的遥感影像镶嵌模型。模型基于开源类库空间数据抽象库(geospatial data abstraction library,GDAL),在GNU/Linux平台下,使用Pytho... 详细信息

针对目前遥感商用软件影像镶嵌过程中人工干预过多、自动化程度不高和不易修改等问题,提出了基于平面剖分的遥感影像镶嵌模型。模型基于开源类库空间数据抽象库(geospatial data abstraction library,GDAL),在GNU/Linux平台下,使用Python语言,实现了遥感影像按研究区域进行掩模及镶嵌的功能,并采用模型—视图—控制器(model view controller,MVC)的设计模式,应用跨平台的图形用户界面(graphical user interface,GUI)库wx Python实现了软件的封装,提供了完整的、功能键全的GUI用户界面。程序可以基于GUI界面或命令行方式运行,参数简单、可定制性强、可以批处理数据,提高了影像镶嵌自动化水平,在东北土地利用数据库更新中被用于Landsat5 TM影像镶嵌。

关键词：遥感影像镶嵌平面剖分模型 GNU/Linux平台 Python语言

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：