检索结果-南通市图书馆

Assessment of ecosystem services value in response to prevailing and future land use/cover changes in Lahore,Pakistan

引用

Regional Sustainability 2020年第1期1卷 37-47页

作者： Mobeen Akhtar Yuanyuan Zhao guanglei gao Qudsia Gulzar Azfar Hussain Abdus Samie Key Laboratory of State Forestry Administration on Soil and Water Conservation Beijing Forestry UniversityBeijing100083China Yanchi Research Station School of Soil and Water ConservationBeijing Forestry UniversityBeijing100083China Centre for Geographic Information Systems University of the PunjabLahore54000Pakistan Institute of Agriculture&Resource Economics(IARE) University of AgricultureFaisalabad38000Pakistan

Land use/cover changes(LUCCs)significantly affect ecosystem services(ESs)and their corresponding monetary *** can be evaluated to analyze the ecological and environmental changes caused by *** research aims to estimate variations in the ecosystem services value(ESV)due to LUCCs in Lahore of Pakistan,and to offer information and recommendations to policy-makers concerned with the economic improvement of metropolis *** first investigated the historical LUCCs from 1990 to 2019,and then simulated the future land use/cover in 2030 and 2050 based on the CA-Markov model under three scenarios,including business-as-usual(BAU),rapid economic growth(REG),and coordinated environmental sustainability(CES).Subsequently,we evaluated the ESV from 1990 to 2050 and evaluated the historical and potential future ESV changes induced by LUCCs during 1990–2019 and 2019–2050,*** results showed that,land use/cover exhibited an increase in built-up land and decreases in vegetation,water body,and unused land both in the past and *** net ESV decreased from 58.26 million USD in 1990 to 50.31 million USD in *** 2050,the decrease in ESV is most rapid under the REG scenario(decrease ESV of 7.13 million USD and decrease percentage of 14.18%),followed by the BAU(decrease ESV of 5.61 million USD and decrease percentage of 11.15%)and CES(decrease ESV of 5.18 million USD and decrease percentage of 10.30%)*** each ecosystem service type,the ESV of waste treatment decreased by 18.37%from 1990 to 2019,followed by soil formation and conservation(17.52%),biodiversity and maintenance(13.23%),climate regulation(11.80%),food production(11.69%),hydrological regulation(11.11%),and aesthetic value(3.07%).These outcomes indicate that continuous land use/cover planning should focus on regenerating aquatic areas and vegetation restoration.

关键词： Ecosystem services Land use/cover changes Environmental sustainability CA Markov Urban expansion Value coefficient

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

Spatiotemporal patterns of the forage-livestock balance in the Xilin Gol steppe,China:implications for sustainably utilizing grassland-ecosystem services

引用

Journal of Arid Land 2021年第2期13卷 135-151页

作者： QU Yingbo ZHAO Yuanyuan DING Guodong CHI Wenfeng gao guanglei Key Laboratory of State Forestry Administration on Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China Yanchi Research Station School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China College of Resources and Environmental Economics Inner Mongolia University of Finance and EconomicsHohhot 010017China

Understanding the spatiotemporal patterns of the forage-livestock balance is imperative for regionally arranging animal husbandry production while ensuring sustainable grassland-ecosystem service *** Xilin Gol steppe is an important native grassland resource in Inner Mongolia Autonomous Region,*** study aimed to elucidate the dynamics of the forage-livestock balance in the Xilin Gol steppe during the period 2000–*** evaluated the forage production and corresponding livestock carrying capacity(LCC)in the growing seasons of 2000–2015 using remote sensing data and field *** spatiotemporal patterns of the forage-livestock balance were then assessed at regional,city(including city,county and banner),and village scales using statistical and household survey *** results showed that both forage production and LCC decreased in the Xilin Gol steppe from east to *** the period 2000–2015,the regional average forage production and corresponding LCC fluctuated without following a distinct trend,but were consistent with the variations in *** forage-livestock balance varied with time,space,and *** the regional scale,steppes were overgrazed in the early 2000s,but a forage-livestock balance or even grazing potential was achieved in other *** the city scale,approximately half of the region exhibited a"forage-livestock balance"since ***,about half of the region still experienced overgrazing,which mainly located in the southwest sandy *** changes may have been affected by the variations in grassland quality,forage production,compensation payment,and so *** suggest a location-specific management scheme for grazing constraints,ecological compensation payment,and industry development to aid in harmonizing animal husbandry and environmental restoration,while promoting sustainable development goals by 2030.

关键词： forage production livestock carrying capacity forage-livestock balance Xilin Gol steppe sustainable development

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

Size-and leaf age-dependent effects on the photosynthetic and physiological responses of Artemisia ordosica to drought stress

引用

Journal of Arid Land 2021年第7期13卷 744-758页

作者： WANG Chunyuan YU Minghan DING Guodong gao guanglei ZHANG Linlin HE Yingying LIU Wei Yanchi Research Station School of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China Key Laboratory of State Forestry Administration on Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China

Drought is one of the most significant natural disasters in the arid and semi-arid areas of *** or plant organs often differ in their responses to drought and other adversities at different growth *** present,little is known about the size-and leaf age-dependent differences in the mechanisms of shrub-related drought resistance in the deserts of ***,we evaluated the photosynthetic and physiological responses of Artemisia ordosica *** drought stress using a field experiment in Mu Us Sandy Land,Ningxia Hui Autonomous Region,China in *** was manipulated by installing outdoor shelters,with four rainfall treatments applied to 12 plots(5 m×5 m).There were four rainfall levels,including a control and rainfall reductions of 30%,50%and 70%,each with three *** individual crown size as the dividing basis,we measured the responses of *** photosynthetic and physiological responses to drought at different growth stages,i.e.,large-sized(>0.5 m^(2))and small-sized(≤0.5 m^(2))*** leaves of *** were divided into old leaves and young leaves for separate *** showed that:(1)under drought stress,the transfer efficiency of light energy captured by antenna pigments to the photosystem II(PSII)reaction center decreased,and the heat dissipation capacity increased *** resist the photosynthetic system damage caused by drought,*** enhanced its free radical scavenging capacity by activating its antioxidant enzyme system;and(2)growth stage and leaf age had effects on the reaction of the photosynthetic system to *** *** plants could not withstand severe drought stress(70%rainfall reduction),whereas large *** individuals could absorb deep soil water to ensure their survival in severe drought stressed *** 30%and 50%rainfall reduction conditions,young leaves had a greater ability to resist drought than old leaves,whereas the latter were more resistant

关键词： drought stress age difference plant size photosynthesis physiological response survival strategy

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

中导向偏心注聚器及配套工具的研究与应用

引用

石油钻采工艺 2014年第1期36卷 77-78,84页

作者：高光磊大庆油田有限责任公司采油工程研究院黑龙江大庆163453

为提高偏心注聚器的投捞成功率，综合考虑上、下两种导向方式的优缺点，开展了中导向偏心注聚器及配套工具的研究。该注聚器在常规偏心配水器结构基础上，将导向体上移至偏心工作筒中部，并可依据不同驱替介质分注要求更换根据不同功能... 详细信息

为提高偏心注聚器的投捞成功率，综合考虑上、下两种导向方式的优缺点，开展了中导向偏心注聚器及配套工具的研究。该注聚器在常规偏心配水器结构基础上，将导向体上移至偏心工作筒中部，并可依据不同驱替介质分注要求更换根据不同功能设计的堵塞器，同时通过改变降压槽的规格来改变节流压差，减少能量及压力损失。室内实验表明，采用该偏心注聚器的分注管柱的一次投捞成功率达到98%，节流元件在70 m3/d流量范围内，最大节流压差可达到2.5 MPa，对聚合物溶液黏损率小于9.2%。现场应用表明，应用该注聚器的分注管柱一次投捞成功率95.6%，较原有技术提高6.9%，2~3层分注井投捞、验封和流量调配有效用时1.5 d左右，较原有技术提高40%。该偏心注聚器的性能可完全满足二、三类油层聚合物驱分注的要求。

关键词：聚合物驱偏心注聚器现场应用

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

Multiple Tin Compounds Modified Carbon Fibers to Construct Heterogeneous Interfaces for Corrosion Prevention and Electromagnetic Wave Absorption

引用

Nano-Micro Letters 2025年第1期17卷 507-527页

作者： Zhiqiang Guo Di Lan Zirui Jia Zhenguo gao Xuetao Shi Mukun He Hua Guo guanglei Wu Pengfei Yin College of Science Sichuan Agricultural UniversityYa’an 625014People’s Republic of China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002People’s Republic of China Institute of Materials for Energy and Environment State Key Laboratory of Bio‑Fibers and Eco‑TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China

Currently,the demand for electromagnetic wave(EMW)absorbing materials with specific functions and capable of withstanding harsh environments is becoming increasingly ***-component interface engineering is considered an effective means to achieve high-efficiency EMW ***,interface modulation engineering has not been fully discussed and has great potential in the field of EMW *** this study,multi-component tin compound fiber composites based on carbon fiber(CF)substrate were prepared by electrospinning,hydrothermal synthesis,and high-temperature thermal *** utilizing the different properties of different substances,rich heterogeneous interfaces are *** effectively promotes charge transfer and enhances interfacial polarization and conduction *** prepared SnS/SnS_(2)/SnO_(2)/CF composites with abundant heterogeneous interfaces have and exhibit excellent EMW absorption properties at a loading of 50 wt%in epoxy *** minimum reflection loss(RL)is−46.74 dB and the maximum effective absorption bandwidth is 5.28 ***,SnS/SnS_(2)/SnO_(2)/CF epoxy composite coatings exhibited long-term corrosion resistance on Q235 steel ***,this study provides an effective strategy for the design of high-efficiency EMW absorbing materials in complex and harsh environments.

关键词： Electrostatic spinning Component regulation Heterogeneous interfaces Electromagnetic wave absorption Corrosion protection

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

炭黑对铅炭电池化成过程的影响

引用

蓄电池 2023年第5期60卷 230-235页

作者：高光磊海装驻青岛地区第二军事代表室山东青岛266011

通过研究电极的比表面积、微观结构、化成过程中电池的内阻变化和模拟电池的电性能,分析比较了3种类型的炭黑对电池性能的影响。炭黑的BET比表面积和吸油值越高,电极的比表面积越大。炭黑影响电极化成第一阶段历经时间,同时影响负极骨... 详细信息

通过研究电极的比表面积、微观结构、化成过程中电池的内阻变化和模拟电池的电性能,分析比较了3种类型的炭黑对电池性能的影响。炭黑的BET比表面积和吸油值越高,电极的比表面积越大。炭黑影响电极化成第一阶段历经时间,同时影响负极骨架型铅的结构和含量。如果添加原生态颗粒尺寸小,比表面积大的炭黑,化成时生成的骨架型铅较多,会导电池容量低,失水量多。

关键词：炭黑铅炭电池化成微观结构比表面积吸油值骨架型铅

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

科尔沁沙地樟子松根内真菌群落结构和功能群特征

引用

林业科学 2020年第9期56卷 87-96页

作者：赵珮杉郭米山高广磊丁国栋张英北京林业大学水土保持学院/水土保持国家林业和草原局重点实验室北京100083 宁夏盐池毛乌素沙地生态系统国家定位观测研究站盐池751500

【目的】揭示科尔沁沙地樟子松根内真菌群落结构和功能群特征,为樟子松人工林经营管理提供依据。【方法】以科尔沁沙地不同林龄(26、33和43年)樟子松人工林为研究对象,利用Illumina MiSeq高通量测序和FUNGuild平台比较分析樟子松根内真... 详细信息

【目的】揭示科尔沁沙地樟子松根内真菌群落结构和功能群特征,为樟子松人工林经营管理提供依据。【方法】以科尔沁沙地不同林龄(26、33和43年)樟子松人工林为研究对象,利用Illumina MiSeq高通量测序和FUNGuild平台比较分析樟子松根内真菌群落结构和功能群,并探究土壤理化性质对根内真菌多样性和功能群结构的影响。【结果】1)科尔沁沙地樟子松根尖样品共获得832个OTUs,不同林龄沙地樟子松根内真菌多样性无显著差异。2)樟子松根内真菌隶属于5门16纲54目84科165属,且子囊菌门和担子菌门占绝对优势。樟子松根内真菌优势属包括鞘孢属、肉座菌属和Phialocephala。随着林龄的增加,优势属比例下降,常见属比例增加,稀有属比例则相对稳定。3)在樟子松根系中,病理营养型真菌比例随林龄增加而降低,共生营养型真菌比例则随林龄增加而急剧增加,主要表现为乳菇属、糙缘腺革菌属和须腹菌属等外生菌根真菌相对丰度增加。4)土壤理化性质和根内真菌多样性无显著相关性,不同真菌营养型中仅共生营养型真菌相对丰度与土壤含水量显著负相关。【结论】科尔沁沙地樟子松根内真菌物种组成丰富,功能群类型多样,不同林龄根内真菌功能群结构波动主要为病理营养型和共生营养型,土壤理化性质对根内真菌物种多样性的影响不显著。

关键词：樟子松腐生真菌病原真菌外生菌根真菌林龄科尔沁沙地

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

呼伦贝尔沙地樟子松根内真菌群落结构与功能群特征

引用

北京大学学报（自然科学版） 2020年第4期56卷 710-720页

作者：魏晓帅郭米山高广磊任悦丁国栋张英北京林业大学水土保持学院水土保持国家林业与草原局重点实验室北京100083 宁夏盐池毛乌素沙地生态系统国家定位观测研究站吴忠751500

为揭示呼伦贝尔沙地樟子松根内真菌群落结构和功能群特征,以呼伦贝尔沙地樟子松天然林和不同林龄人工林为研究对象,采用野外调查和分子生物学相结合的方法,鉴定并分析沙地樟子松根内真菌群落结构和功能群特征。在呼伦贝尔沙地樟子松根... 详细信息

为揭示呼伦贝尔沙地樟子松根内真菌群落结构和功能群特征,以呼伦贝尔沙地樟子松天然林和不同林龄人工林为研究对象,采用野外调查和分子生物学相结合的方法,鉴定并分析沙地樟子松根内真菌群落结构和功能群特征。在呼伦贝尔沙地樟子松根尖样品中共获得520个真菌OTUs,隶属于5门87科197属,其中担子菌门(Basidiomycota)和子囊菌门(Ascomycota)的相对丰度较高,分别为54.98%和39.27%。天然林优势菌属为双子担子菌属(Geminibasidium)、红菇属(Russula)和Phialocephala,人工林优势菌属为乳牛肝菌属(Suillus)、Phialocephala和口蘑属(Tricholoma),其余菌属的相对丰度随林龄的变化波动较大。沙地樟子松人工林根内真菌α多样性指数随林龄增长均呈降低趋势,成熟林根内真菌α多样性指数显著低于沙地樟子松近熟林、中龄林和天然林(P<0.05)。沙地樟子松天然林与人工林根内真菌群落结构变异性较小。其中,天然林与成熟林根内真菌群落结构差异较大,与近熟林根内真菌群落结构最接近。共生营养型真菌比例随林龄增长而逐渐增大,腐生营养型和病理营养型真菌比例随林龄增长逐渐减小;天然林与近熟林共生营养型真菌的占比较为接近,腐生营养型真菌在天然林中占比较大。沙地樟子松根内真菌群落结构复杂,物种丰富多样,外生菌根真菌和未定义腐生菌为主要功能类群,部分真菌在不同林分的生态策略存在差异。

关键词：根内真菌沙地樟子松呼伦贝尔沙地多样性群落结构生态功能群

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

聚合物驱与三元复合驱分注剪切机理差异分析

引用

采油工程 2017年第1期 77-80,93-94页

作者：高光磊大庆油田有限责任公司采油工程研究院

室内实验表明,三元复合溶液流经相同分压注入工具,其溶液黏度损失比聚合物流经相同分压注入工具的溶液黏度损失高1倍以上,高黏损会降低三元复合驱整体驱油效果。为弄清两种溶液黏度损失差异,利用扫描电镜和动态激光散射技术手段,对比分... 详细信息

室内实验表明,三元复合溶液流经相同分压注入工具,其溶液黏度损失比聚合物流经相同分压注入工具的溶液黏度损失高1倍以上,高黏损会降低三元复合驱整体驱油效果。为弄清两种溶液黏度损失差异,利用扫描电镜和动态激光散射技术手段,对比分析了两种溶液流经分压工具前、后微观分子聚集形态和聚合物分子线团直径。对比结果表明:由于三元复合溶液中碱和表面活性剂的存在,三元复合溶液微观分子聚集形态的网格非常稀疏易破坏,造成流经相同分压工具,三元复合溶液黏度损失较大,此结果对优化化学驱分注工具结构具有理论指导意义。

关键词：分压工具黏度损失扫描电镜动态激光散射分子聚集形态分子线团直径

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

聚合物驱电动直读测调技术改进及现场应用

引用

中外能源 2022年第9期27卷 54-57页

作者：高光磊大庆油田有限责任公司采油工程研究院黑龙江大庆163453 黑龙江省油气藏增产增注重点实验室黑龙江大庆163453

大庆油田聚合物驱在进入规模化应用后,分注井的测调问题突出,前期研发的聚合物驱电动直读测调技术,由于聚合物驱井下团块、杂质附着情况严重以及配套工具自身设计等问题,导致其测试过程成功率不高,影响了现场施工效果。针对此问题,对聚... 详细信息

大庆油田聚合物驱在进入规模化应用后,分注井的测调问题突出,前期研发的聚合物驱电动直读测调技术,由于聚合物驱井下团块、杂质附着情况严重以及配套工具自身设计等问题,导致其测试过程成功率不高,影响了现场施工效果。针对此问题,对聚合物驱电动直读测调技术进行了进一步的改进升级,研制出大扭矩电动直读测调仪,使测调仪输出扭矩由8N·m提高至12N·m;重新设计测调仪传感器布局,将原有内磁式双流量计测试方式变为外磁式单流量计测试,提高了测试过程的稳定性。同时对可调堵塞器结构进行设计优化,形成新型可调堵塞器。优化后的电动直读测调技术现场试验89口井,投捞成功率由93%提高到95.2%,投捞过程未出现卡顿、弯折现象;仪器一次对接成功率达到95%;抗堵塞性能得到增强;憋压情况进一步缓解,平均单井注入压力下降0.2MPa。

关键词：聚合物驱电动直读测调技术可调堵塞器大扭矩抗堵塞憋压

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：