检索结果-南通市图书馆

A conceptual model for a process-oriented landscape pattern analysis

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

Science China Earth Sciences 2019年第12期62卷 2050-2057页

作者： Liding CHEN Ranhao SUN yihe lu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China The University of Chinese Academy of Sciences Beijing 100049China

Linking landscape patterns to specific ecological processes has been and will continue to be the key topic in landscape ***,this goal is difficult to achieve by using the traditional landscape metric based on the Patch-Mosaic Model(PMM),as they don’t integrate ecological processes with landscape *** this paper,we proposed a conceptual model,i.e.,the Source-Pathway-Sink Model(SPSM),which designates the role of a landscape unit into "source", "sink",or "pathway" based on specific ecological processes during the landscape pattern *** the traditional landscape metrics derived from the PMM model is visual-or geometrical-oriented and lack of linkage to ecological significance,the SPSM model is process-oriented,dynamic,and scale dependent.A comparison between the PMM and the SPSM models shows that the SPSM model is complementary to the PMM model,and can provide a simple and dynamic perspective on landscape pattern *** SPSM model may represent a conceptual innovation in landscape ecology.

关键词： Landscape metric Landscape pattern analysis Process-oriented Patch-Mosaic Model(PMM) Source-Pathway-Sink Model(SPSM) Ecological significance

Poverty Reduction,Environmental Protection and Ecosystem Services:A Prospective Theory for Sustainable Development

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2014年第1期24卷 83-92页

作者： ZHEN Nahui FU Bojie lu yihe WANG Shuai State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Poverty reduction and environmental protection are two global tasks for sustainable *** study perspective has changed over time,from narrowly focusing on poverty reduction to comprehensively strengthening *** reviewed key references targeting the theoretical content and practical approach relying on poverty,environment protection and ecosystem *** discussed the contradicting views on the relationship of poverty and environmental degradation,and then illustrated the study progress of a cutting-age topic-ecosystem services which pave a way to address poverty reduction and environmental protection *** last,we investigated essential factors that affect the development and environmental *** the evolution of the concept of poverty,we found that the environment has occupied an increasing proportion in the cognizance of *** relationship between poverty and environmental degradation is regional *** practical aspect,projects based on the management and valuation assessment of ecosystem services draw researchers′attention all over the *** appropriate scale,essential economic incentives,morality,law and social equality are key factors affecting individuals′decisions which directly relate to the sustainable development.

关键词：生态系统服务可持续发展环境保护扶贫环境退化实践方法保护环境价值评估

Enhancing the peroxidase-like activity of MoS_(2)-based nanozymes by introducing attapulgite for antibacterial application and sensitive detection of glutathione

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第8期17卷 7415-7426页

作者： Feng Feng yihe Zhang Xiao Zhang Bin Mu Jiahe Zhang Wenjie Qu Wangshu Tong Minmin Liang Qi An Zhanjun Guo lu Zhao Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Clay Mineral Applied Research of Gansu Province Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Experimental Center of Advanced Materials School of Materials Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Nanozymes are next-generation of nanomaterials with enzyme-like *** particular,nanozymes with peroxidase(POD)-like activity have been utilized in various fields,including antibacterial,detection,degradation,***,their extensive applications were limited by their low catalytic activity ***,we have presented a composite nanozyme based on attapulgite(ATP)(Fe-ATP-MoS_(2)(FAM)),which exhibited enhanced POD-like activity(185.33 U·mg^(−1)),4.25 times higher than that of Fe-MoS_(2)(FM)(43.63 U·mg^(−1)).The density functional theory(DFT)calculations indicated that the addition of ATP increased the electron density of metal centers(Mo and Fe).More importantly,Michaelis–Menten kinetics revealed that the introduction of ATP significantly enhanced the binding affinities of substrates through the pores of ATP,forming a highly concentrated substrate microenvironment and thus promoting its POD-like ***,from molecular size and kinetic analysis,we proposed that the changes in substrate size before and after oxidation also significantly affected its Michaelis-constant(Km)***,we utilized FAM in the applications of highly effective antibacterial application and sensitive detection of glutathione(GSH).In conclusion,this work provides a novel approach for designing a highly efficient nanozyme based on natural mineral composites.

关键词： attapulgite peroxidase electron density affinity antibacterial

Land Use Change and Anthropogenic Driving Forces:A Case Study in Yanhe River Basin

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

Chinese Geographical Science 2011年第5期21卷 587-599页

作者： SU Changhong FU Bojie lu yihe lu Nan ZENG Yuan HE Anna Halina LAMPARSKI State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China ENV Australia Pry Ltd 113 Hamersley Road Subiaco Perth 6008 Australia

Human activities alter land use patterns and affect landscape sustainability. It is therefore very important to investigate the relationship between land use change and human activities. This study focuses on the detection of changing land use patterns in the Yanhe River Basin in northern Loess Plateau of China between 1995 and 2008. Landscape metrics were used to analyze the changing land use patterns and to explore the related anthropogenic driving forces. Results show that:1) Totally, 186 590 ha of croplands were converted into alternate land-use types (equivalent to 61.7% of the original cropland area). The majority of cropland areas were found to be converted into grassland and woodland areas (accounting for 55.9% and 4.9% respectively of the original cropland areas). 2) Both cropland and woodland demonstrated an increasing fragmentation tendency while grasslands showed a decreasing fragmentation tendency. 3) Multiple driving forces of land use change were thought to act together to changes in landscape metrics in the Yanhe River Basin. The anthropogenic driving forces were analyzed from four perspectives:ecological conservation policy, labor force transfer, industrial development, and rural settlement. The policy of the GfG (Grain for Green) project was the main driving factor which expedited the conversion from cropland to woodland and grassland. Industrial development was also found to affect land use change through the direct impact of economic activities such as oil exploration and agricultural production, or through indirect impacts such as the industrial structures readjustment. Labor force transfer from rural to urban areas was found to follow the industrial structure readjustment and further drove land use change from cropland to off-farm land use. Establishment of new tile-roofed houses instead of cave-type dwellings in rural settlements has helped to aggregate the original scattered land-use type of construction.

关键词：土地利用方式延河流域驱动力产业结构调整农村居民点案例土地利用格局土地利用模式

在线全文

学校读者我要写书评

暂无评论

生态系统服务建模技术研究进展

生态学报 2018年第15期38卷 5287-5296页

作者：李婷吕一河中国科学院生态环境研究中心城市与区域生态国家重点实验室北京100085 中国科学院大学北京100049

在生态系统服务评估模型的数量、类型及应用大量增加的背景下,为将生态系统服务评估有效整合到决策中,系统比较、甄别不同建模工具并筛选出适合决策需求的生态系统服务评估和模拟方法尤为必要。因此,归纳并总结了国内外现有的生态系统... 详细信息

在生态系统服务评估模型的数量、类型及应用大量增加的背景下,为将生态系统服务评估有效整合到决策中,系统比较、甄别不同建模工具并筛选出适合决策需求的生态系统服务评估和模拟方法尤为必要。因此,归纳并总结了国内外现有的生态系统服务评估模型的建模技术,包括:相关关系法、生物-物理过程法以及专家知识法;分别对其原理、差异、优缺点以及适用性进行了详尽阐释。大多数相关模型侧重于统计关系,相对容易创建和扩展,适用于生态系统服务的初始评估;生物-物理过程模型难以构建且不易获取,但提供了探索人-地系统相互作用和长期变化的有效机制;专家知识法有效结合了多种类型的知识体系,关注人类社会与自然系统之间反馈和交互动态的系统整合,但当评估地点发生变化时难以验证。在此基础上,介绍了基于上述3种建模技术的典型生态系统服务综合评估模型的发展和应用现状。各类建模技术面临着实用性和科学准确性之间的权衡。通过对不同建模技术的梳理与整合分析旨在提升当前生态系统服务研究的决策支撑能力,并为国内相关研究提供参考和借鉴。

关键词：生态系统服务建模技术模型决策支持

高等林业院校校外长期科研基地建设与管理研究——以南京林业大学白马长期科研基地为例

在线全文

学校读者我要写书评

暂无评论

农业科技管理 2023年第1期42卷 56-59,64页

作者：朱兴洲农春仕司红波卢逸和南京林业大学江苏南京210037

林业长期科研基地承载着人才培养、科技创新和科技成果转化等重要任务。文章以南京林业大学白马长期科研基地为例,阐述了高等林业院校校外长期科研基地建设的必要性,分析了高等林业院校校外长期科研基地目前存在的问题,从统筹规划设计... 详细信息

林业长期科研基地承载着人才培养、科技创新和科技成果转化等重要任务。文章以南京林业大学白马长期科研基地为例,阐述了高等林业院校校外长期科研基地建设的必要性,分析了高等林业院校校外长期科研基地目前存在的问题,从统筹规划设计、探索多渠道融资、创新管理模式等方面提出了促进高等林业院校校外长期科研基地可持续发展的对策与建议,旨在为高等林业院校校外长期科研基地建设与管理提供参考。

关键词：高等林业院校林业长期科研基地建设管理

在线全文

学校读者我要写书评

暂无评论

古树名木地理信息采集技术研究

测绘技术装备 2024年第2期26卷 44-50页

作者：卢国豪张一贺珠海市测绘院广东珠海519015

古树名木承载了时间印记和历史变迁,因此,古树名木的地理信息采集工作十分重要。本文提出了古树名木相关信息采集的技术方法,详细描述了古树名木冠幅测量、空间位置测量和胸围测量的具体采集要求,深入研究了古树名木信息采集涉及的测量... 详细信息

古树名木承载了时间印记和历史变迁,因此,古树名木的地理信息采集工作十分重要。本文提出了古树名木相关信息采集的技术方法,详细描述了古树名木冠幅测量、空间位置测量和胸围测量的具体采集要求,深入研究了古树名木信息采集涉及的测量技术;基于古树名木调查数据处理软件,对采集的数据进行处理、生产和入库,并与已有数据进行融合更新,形成了专题数据,完成了古树名木调查数据库设计。另外,本文还结合珠海市古树名木地理信息采集项目,将该技术运用在具体项目中,为古树名木数据的采集和管理保护提供技术支撑。

关键词：古树名木信息采集冠幅宽度一树一档

基于改进的ART2神经网络的滚动轴承故障诊断

在线全文

学校读者我要写书评

暂无评论

济南大学学报（自然科学版） 2019年第6期33卷 537-543页

作者：吴肇中郝如江陆一鹤中国铁路北京局集团有限公司邯郸机务段河北邯郸056003 石家庄铁道大学机械工程学院河北石家庄050043

针对自适应共振理论2(ART2)神经网络在分类时存在只选择输出值最大的神经元以及噪声对结果影响较大的缺点,提出一种结合小波软阈值和K均值算法的ART2神经网络分类方法;采用小波软阈值对滚动轴承故障信号进行降噪,并通过相对小波包能量... 详细信息

针对自适应共振理论2(ART2)神经网络在分类时存在只选择输出值最大的神经元以及噪声对结果影响较大的缺点,提出一种结合小波软阈值和K均值算法的ART2神经网络分类方法;采用小波软阈值对滚动轴承故障信号进行降噪,并通过相对小波包能量体现降噪后的信号更好的信号互异性,然后运用ART2神经网络进行初步分类,将K均值算法引入ART2神经网络,对原有的算法进行修正,并与ART2神经网络分类结果进行对比。结果表明,改进的方法解决了上述的问题,提高了故障分类的准确性。

关键词：小波软阈值 ART2神经网络 K均值算法相对小波包能量

在线全文

学校读者我要写书评

暂无评论

半干旱区景观格局与生态水文过程研究进展

地球科学进展 2009年第11期24卷 1238-1246页

作者：王朗徐延达傅伯杰吕一河中国科学院生态环境研究中心城市与区域生态国家重点实验室北京100085 中国科学院研究生院北京100039

景观格局和生态水文过程之间具有紧密的联系和相互作用,在半干旱地区这种联系尤为显著,是地球科学研究的重要前沿领域。尺度效应在两者关系中起重要作用,不同尺度下两者相互作用机制有很大差异。归纳总结了半干旱地区景观格局与生态水... 详细信息

景观格局和生态水文过程之间具有紧密的联系和相互作用,在半干旱地区这种联系尤为显著,是地球科学研究的重要前沿领域。尺度效应在两者关系中起重要作用,不同尺度下两者相互作用机制有很大差异。归纳总结了半干旱地区景观格局与生态水文过程的研究现状与进展,包括二者相互作用机理、影响因素、干扰、尤其是人为干扰对这种相互作用的影响,以及模型模拟等。以尺度为线索,在斑块、坡面和流域尺度进行展开。最后,提出了半干旱地区景观格局与生态水文过程研究中存在的问题、热点和趋势,包括物理机制、干扰后的恢复机制、模型发展、流域尺度集成及尺度转换。

关键词：生态水文过程景观格局尺度干扰