检索结果-南通市图书馆

Natural forests exhibit higher organic carbon concentrations and recalcitrant carbon proportions in soil than plantations: a global data synthesis

引用

JOURNAL OF FORESTRY RESEARCH 2024年第1期35卷 1-11页

作者： Nie, Xiuqing Wang, Hui Wang, Jian liu, shirong Chinese Acad Forestry Ecol & Nat Conservat Inst Key Lab Forest Ecol & Environm Natl Forestry & Gra 2 Dongxiaofu Beijing 100091 Peoples R China

Different chemical compositions of soil organic carbon (SOC) affect its persistence and whether it significantly differs between natural forests and plantations remains unclear. By synthesizing 234 observations of SOC chemical compositions, we evaluated global patterns of concentration, individual chemical composition (alkyl C, O-alkyl C, aromatic C, and carbonyl C), and their distribution evenness. Our results indicate a notably higher SOC, a markedly larger proportion of recalcitrant alkyl C, and lower easily decomposed carbonyl C proportion in natural forests. However, SOC chemical compositions were appreciably more evenly distributed in plantations. Based on the assumed conceptual index of SOC chemical composition evenness, we deduced that, compared to natural forests, plantations may have higher possible resistance to SOC decomposition under disturbances. In tropical regions, SOC levels, recalcitrant SOC chemical composition, and their distributed evenness were significantly higher in natural forests, indicating that SOC has higher chemical stability and possible resistance to decomposition. Climate factors had minor effects on alkyl C in forests globally, while they notably affected SOC chemical composition in tropical forests. This could contribute to the differences in chemical compositions and their distributed evenness between plantations and natural stands.

关键词： Global data synthesis Natural forest Plantations Soil organic carbon Soil organic carbon chemical composition STATE C-13 NMR SPATIAL-DISTRIBUTION MICROBIAL COMMUNITY MATTER FRACTIONS QUALITY SEQUESTRATION STABILIZATION DECOMPOSITION DIVERSITY

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

In-situ analysis and genetic investigation of Li-bearing minerals in McDermitt clay-type lithium deposit,Nevada,USA

引用

Acta Geochimica 2024年第3期43卷 478-488页

作者： Yi Cui Hanjie Wen Zhengbing Zhou Kunyue Ling Lin Xu shirong liu Fei Xu School of Earth Sciences East China University of TechnologyNanchang 330013China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Sciences and Resources Chang’an UniversityXi’an 710054China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

Clay-type Li deposits are poised to play a pivotal role in addressing the surging global demand for *** McDermitt clay-type Li deposit,located in Nevada,is the largest Li deposit in the United States,with Li hosted by a clay-rich sequence of smectite-dominated intervals and illite-dominated intervals,***,the occurrence of Li and the genesis of Li-bearing minerals within smectite-dominated intervals have not been thoroughly investigated in previous ***,we studied the mineralogy,the in-situ Li distribution,and the bonding environments of Li within the smectite intervals using a combination of instru-mental techniques including scanning electron microscope,transmission electron microscope,time-of-flight secondary ion mass spectrometry,and nuclear magnetic *** results indicate that the smectite exhibits low crystallinity characteristics of lacustrine clay authigenesis and is com-monly found tofill the interstices among volcanic minerals or envelop them;Li is mainly hosted by Mg-smectite rather than the volcanic *** the tuffaceous sediment samples,the volcanic glass has undergone a transformation,resulting in its complete disappearance and alteration into clay *** to the octahedral sites of Mg-smectite bounded in Li,it is referred to be *** interpret that the hectorite’s precipitation occurs in a high saline-alkaline water environment,a result of McDermitt *** conclusion can be supported by the coexistence of spherulitic calcite and ***,this study confirms hectorite as the main Li-bearing mineral and increases the understanding of the genetic model of hectorite formation in intracontinental caldera basins.

关键词： McDermitt caldera Lithium occurrence Tuffaceous sediments Mineralogy Hectorite neoformation

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

Litter quality and decomposer complexity co-drive effect of drought on decomposition

引用

Forest Ecosystems 2024年第3期11卷 329-338页

作者： Shumei Wang Junwei Luan Siyu Li Jinhao Ma Lin Chen Yi Wang shirong liu Sanya Research Base International Centre for Bamboo and RattanSanya572022China Institute of Resources and Environment Key Laboratory of Bamboo and Rattan Science and Technology of National Forestry and Grassland AdministrationInternational Centre for Bamboo and RattanBeijing100102China Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing100091China Experimental Center of Tropical Forestry Chinese Academy of ForestryPingxiang532600China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu610041China

Litter decomposition is key to ecosystem carbon(C)and nutrient cycling,but this process is anticipated to weaken due to projected more extensive and prolonged *** how litter quality and decomposer community complexity regulate decomposition in response to drought is less ***,in a five-year manipulative drought experiment in a Masson pine forest,leaf litter from four subtropical tree species(Quercus griffthii Hook.f.&Thomson ex Miq.,Acacia mangium Willd.,Pinus massoniana Lamb.,Castanopsis hystrix Miq.)representing different qualities was decomposed for 350 d in litterbags of three different mesh sizes(i.e.,0.05,1,and 5 mm),respectively,under natural conditions and a 50%throughfall rain exclusion *** of increasing mesh sizes discriminate decomposer communities(i.e.,microorganisms,microorganisms and mesofauna,microorganisms and meso-and macrofauna)that access the litter and represent an increasing *** amount of litter C and nitrogen(N)loss,and changes in their ratio(C/N_(loss)),as well as small and medium-sized decomposers including microorganisms,nematodes,and arthropods,were *** found that drought did not affect C and N loss but decreased C/N_(loss)(i.e.,decomposer N use efficiency)of leaf litter irrespective of litter quality and decomposer ***,changes in the C/N_(loss)and the drought effect on C loss were both dependent on litter quality,while drought and decomposer complexity interactively affected litter C and N *** decomposer community complexity enhanced litter decomposition and allowing additional access of meso-and macro-fauna to litterbags mitigated the negative drought effect on the microbial-driven ***,both the increased diversity and altered trophic structure of nematode due to drought contributed to the mitigation effects via cascading *** results show that litter quality and soil decomposer community complexity co-drive the effect of

关键词： Arthropod Drought Decomposer community Nutrient cycling Nematode

来源：

维普期刊数据库

同方期刊数据库

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

碳中和目标下中国森林碳储量、碳汇变化预估与潜力提升途径

引用

林业科学 2024年第4期60卷 157-172页

作者：刘世荣王晖李海奎余振栾军伟中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林生态环境重点实验室北京100091 中国林业科学研究院资源信息研究所国家林业和草原局森林经营与生长模拟重点实验室北京100091 南京信息工程大学应用气象学院南京210044 国际竹藤中心竹藤资源与环境研究所国家林业和草原局/北京市共建竹藤科学与技术重点实验室北京100102

增强森林固碳增汇功能是减缓大气二氧化碳浓度上升和全球气候变暖的重要手段,也是实现碳中和国家战略目标的有效途径。本研究基于文献分析法和模型模拟,系统阐述中国森林碳储量和碳汇现状、动态变化与潜力提升途径。根据国家森林资源连... 详细信息

增强森林固碳增汇功能是减缓大气二氧化碳浓度上升和全球气候变暖的重要手段,也是实现碳中和国家战略目标的有效途径。本研究基于文献分析法和模型模拟,系统阐述中国森林碳储量和碳汇现状、动态变化与潜力提升途径。根据国家森林资源连续清查数据测算的森林植被碳储量近5年平均年增长0.152 Pg(以C计),2000s—2010s中国陆地生态系统碳汇量约229.7 Tg·a^(-1)(以C计),其中森林植被(指乔木林)碳储量约增加150.6 Tg·a^(-1)(以C计),约占整个陆地生态系统植被碳汇量的65.6%。过去70年,中国森林已从碳源转变为逐渐增强的碳汇。在森林面积保持不变的情景下,相比2000s—2010s时段,2030年后现有乔木林的生物量碳汇将有所下降;如果森林面积未来持续增加,2030—2050年中国新增乔木林的碳汇量仍将呈增加趋势。在全球变化背景下,气候变化及其引发的风险(极端干旱与热浪事件、森林火灾、病虫害等)可能会削弱森林碳汇功能。为维持并提升森林碳储量和碳汇潜力,需要采取森林碳储与碳汇双增以及森林碳汇与木质林产品碳库协同提升的策略,从保碳、增碳、扩碳和碳资源化利用的汇转移4个途径对森林资源实施保护修复、精准绿化、科学经营与合理利用以及多时空尺度的优化布局,同时重视森林土壤碳库增汇的长期效应。在林业减缓和适应气候变化框架下,森林碳汇潜力提升未来研究重点是科学推进国土绿化适宜造林地和树种选择,森林经营增汇技术,森林碳储、碳汇协同提升与木质产品库的碳汇转移与存续的时空配置优化模式,森林土壤固碳增汇机制以及潜力研究,准确评估森林碳汇对实现国家碳中和目标的贡献及其时间表和路线图。

关键词：森林碳储量碳汇森林面积固碳潜力碳增汇技术

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

撞击过程对月表氧逸度的改造:来自嫦娥五号月壤中撞击玻璃珠的启示

引用

Science Bulletin 2024年第10期69卷 1495-1505页

作者：庞润连杨晶李瑞刘世荣李琼朱丹杜蔚刘耘 State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Center for Lunar and Planetary Sciences Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 101408China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China Research Center for Planetary Science College of Earth ScienceChengdu University of TechnologyChengdu 610059China

Lunar materials are overall more reducing compared with their terrestrial counterparts,but the mechanism remains to be *** this study,we present a possible explanation for the changes in redox state of the lunar regolith caused by impact events,based on our investigations of the impact glass beads from Chang’e-5 *** glass beads contain iron metal grains and show concentration gradients of FeO and K_(2)O(with or without Na_(2)O)from their rims to *** compositional profiles exhibit errorfunction-like shapes,which indicates a diffusion-limited *** numerical modeling results suggest that the iron metal grains on the surface of the glass beads were generated through the reduction of FeO by elemental K and(or)Na produced during the impact ***,the iron metal grains inside the bead may have formed due to oxygen diffusion driven by redox potential ***,our study suggests that impact processes intensify the local reducing conditions,as evidenced by the presence of calcium sulfide particles within troilite grains that coexist with iron metal grains on the surface of the glass *** study provides insights into the oxygen diffusion kinetics during the formation of iron metal spherules and sheds light on the changes in redox conditions of lunar materials caused by impact events.

关键词： Chang’e-5 Lunar sample Glass beads Impact Oxygen fugacity Redox change

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

Thermoelastic Damping of Functionally Graded Material Micro-Beam Resonators Based on the Modified Couple Stress Theory

引用

Acta Mechanica Solida Sinica 2020年第4期33卷 496-507页

作者： Zhichao Zhang shirong liu School of Civil Engineering and Science Yangzhou UniversityYangzhou 225127China

Thermoelastic damping(TED)is one of the main internal energy dissipation mechanisms in micro/*** evaluation of TED is important in the design of micro-electromechanical systems and nano-electromechanical *** this paper,a theoretical analysis on the TED in functionally graded material(FGM)micro-beam resonators is *** of motion and the heat conduction equation governing the thermodynamic coupling free vibration of non-homogenous micro-beams are established based on the Euler Bernoulli beam theory associated with the modified couple stress *** properties of the FGM micro-beam are assumed to change in the depth direction as power-law *** layer-wise homogenization method is used for solving the heat conduction *** using the mathematical similarity of eigenvalue problem between the FGM beam and the reference homogeneous one,the complex natural frequency including TED is expressed in terms of the natural frequency of the isothermal homogenous *** the presented numerical results,influences of various characteristic parameters,such as beam thickness,material gradient index,structure size,vibration mode and boundary conditions,on TED are examined in *** shows that TED decreases with the increases in the values of length scale parameters because the latter lead to the increase in structural stiffness.

关键词： Functionally graded material Size dependent Thermoelastic damping Micro-beam

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

宝天曼8种阔叶树木材密度的解剖学决定因素及其与叶性状的协同与权衡

引用

林业科学 2024年第4期60卷 62-70页

作者：杭宇杰陈志成王林牛保亮刘松松于博王晓刘世荣山西农业大学林学院晋中030801 国家林业和草原局森林生态环境重点实验室、中国林业科学研究院森林生态环境与自然保护研究所北京100091 河南宝天曼森林生态系统国家野外科学观测研究站南阳474350 河南内乡宝天曼国家级自然保护区管理局内乡474350

【目的】探究影响木材密度的解剖学机制,揭示茎叶解剖和生理性状的协同与权衡关系,有助于阐明不同树种适应环境的生理生态机制。【方法】选择宝天曼天然林中常见的8种落叶阔叶树,测定木材密度、木质部导管及纤维等解剖性状、叶片压力-... 详细信息

【目的】探究影响木材密度的解剖学机制,揭示茎叶解剖和生理性状的协同与权衡关系,有助于阐明不同树种适应环境的生理生态机制。【方法】选择宝天曼天然林中常见的8种落叶阔叶树,测定木材密度、木质部导管及纤维等解剖性状、叶片压力-容积曲线参数等21个茎叶性状,探究决定木材密度的解剖学性状,分析茎叶性状的协同和权衡关系。【结果】1) 8个树种的木材密度与组成木质部的导管、薄壁组织和纤维组织这3大组织的比例都不相关,更多受到纤维细胞性状的影响。2)对木材密度影响最大的木质部性状是纤维细胞腔占横截面的比例,其次是纤维细胞壁占纤维细胞的比例、纤维细胞壁厚与腔直径比、纤维细胞壁厚度等性状。3)木材密度与叶片单叶面积、失膨压时相对含水量和弹性模量呈负相关。4)失膨压时相对含水量与导管水力直径、最大导管直径、平均导管直径、纤维细胞腔面积、纤维细胞腔直径呈正相关;与导管密度、纤维细胞壁厚与腔直径比、纤维细胞壁占横截面比例呈负相关。【结论】木材密度主要由纤维细胞性状决定,而非导管和薄壁组织性状;高的叶片忍耐失水能力耦合于致密的茎纤维细胞和木材密度。

关键词：木材密度功能性状木质部解剖纤维性状失膨压时相对含水量

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

Habitats shape root-associated fungal and bacterial communities of Minjiang fir saplings

引用

林业研究:英文版 2023年第5期34卷 1491-1502页

作者： Maoping Li Ning Miao shirong liu International Centre for Bamboo and Rattan Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and TechnologyInstitute of Resources and EnvironmentBeijing 100102People’s Republic of China Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing 100091People’s Republic of China Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610065People’s Republic of China

Root-associated microbes play an essentialrole in mediating plant growth,health,and habitat ***,it is unknown which microbial taxa help develop host fitness and how habitats shape root-associated microbial assembly *** an endemic species of subalpine forests in western Sichuan,China,Minjiang fir(Abies fargesii ***)is dominant on cold-shaded northwestern slopes while absent on warm sunlit southwestern *** this study,fungal and bacterial communities were investigated in three spatial compartments(endosphere,rhizosphere,and bulk soil)associated with Minjiang fir saplings on a cold-shaded northwestern slope and a warm sunlit southwestern *** differentiated the microbial communities regardless of the spatial compartment and microbial *** aspect variations caused shifts in root-associated(rhizosphere and endosphere)microbial *** with the southwestern slope,the cold-shaded northwestern slope harbored a higher abundance of the growth-promoting bacteria Burkholderia and ectomycorrhizal fungi Cortinarius and *** slope aspect had stronger effects on fungal diversity than bacterial diversity,with higher fungal endemism and lower bacterial *** aspect variations were the dominant drivers of root-associated microbial communities,with lower contribution by soil properties and higher contribution by plant traits on the northwestern *** from this study could improve the understanding of plant habitat adaptability from the perspective of microbial community *** is suggested that forest management should consider root-associated microbiomes for enhancing species fitness and habitat adaptability.

关键词： Species fitness Root-associated microbes Microbial assembly patterns Habitat conditions

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

7年穿透雨减少对锐齿槲栎光合固碳及生物量碳储量的影响

引用

生态学报 2024年第5期44卷 1904-1917页

作者：刘翠菊陈志成刘世荣高小敏牛保亮刘晓静白兵勇中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林生态环境重点实验室北京100091 河南宝天曼森林生态系统国家野外科学观测研究站南阳473000 河南宝天曼国家级自然保护区管理局内乡474350

气候变化背景下不断加剧的干旱事件对树木的生长及碳积累产生显著影响。然而,树木光合固碳能力及生物量碳储量对相对长期干旱的连续响应机制的研究仍然有限。选择70年生的天然锐齿槲栎(Quercus aliena ***)林,探究长期模拟穿透雨减少对... 详细信息

气候变化背景下不断加剧的干旱事件对树木的生长及碳积累产生显著影响。然而,树木光合固碳能力及生物量碳储量对相对长期干旱的连续响应机制的研究仍然有限。选择70年生的天然锐齿槲栎(Quercus aliena ***)林,探究长期模拟穿透雨减少对锐齿槲栎光合固碳潜力和生物量碳储量的影响。研究结果表明,连续7年的穿透雨减少处理显著降低了锐齿槲栎的光合固碳能力,其叶片净光合速率(A)、最大羧化速率(V_(cmax))、最大电子传递速率(J_(max))、最大光化学效率(F_(v)/F_(m))均明显降低,且穿透雨减少处理增强了A与气孔导度(g_(s))、J_(max)、F_(v)/F_(m)之间的相关性。在适应长期干旱过程中,锐齿槲栎通过增加比叶面积(SLA)、叶片栅栏组织与海绵组织的比值、气孔密度等叶片形态及结构特性变化,降低冠层叶面积(LAI)指数和蒸腾水分散失及提高水分利用效率(WUE)缓解和适应干旱胁迫的不利影响。但是,长期穿透雨减少仍然降低了锐齿槲栎的生物量碳储量。穿透雨减少处理7年后,叶生物量碳下降30.6%、茎生物量碳下降34.3%、地下生物量碳下降26.4%,总生物量碳下降32.8%。同时,地下/地上生物量碳比值显著提高,表明锐齿槲栎通过增加地下碳投入和生长适应干旱胁迫。在未来降雨格局变化下,锐齿槲栎生长及叶性状的适应性调整是该树种能够长期生存的重要策略。研究为评价全球气候干化背景下暖温带锐齿槲栎林光合固碳能力和碳储量的变化提供了科学依据。

关键词：气候变化降雨减少光合作用水分利用效率碳储量

来源：

维普期刊数据库博看期刊

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

生态流量方法应用现状研究

引用

生态学报 2024年第1期44卷 36-46页

作者：李强王俏俏陈红丽秦艳丽张明芳刘世荣西北农林科技大学林学院杨凌712100 电子科技大学资源与环境学院成都611731 中国林业科学研究院森林生态环境与自然保护研究所北京100091

水资源是制约国家经济社会发展的重要因素。长期以来,水资源的过度开发利用直接影响了流域的生态保护和高质量发展。生态流量(Ecological Flow)是保障流域水生态环境可持续发展和管理的重要指标。然而当前研究方法众多,尚未进行系统性... 详细信息

水资源是制约国家经济社会发展的重要因素。长期以来,水资源的过度开发利用直接影响了流域的生态保护和高质量发展。生态流量(Ecological Flow)是保障流域水生态环境可持续发展和管理的重要指标。然而当前研究方法众多,尚未进行系统性梳理。以生态流量为出发点,归纳总结国内生态流量评估的最新进展,系统地对水文学法、水力学法、生境模拟法和整体分析法等四大类共17种方法进行对比总结,评述其优缺点及适用条件,并根据国内流域的生态流量评估现状,建议在我国流域水系庞杂且气候、水文地质、下垫面和水资源开发利用等条件差异较大的情况下,因地制宜地选择生态流量评估方法。未来的生态流量研究和流域水生态管理应综合考虑气候、水文条件变化和人类活动的影响,依据生态流量目标制定、水利水电工程调度、生态流量监测、流域制度法规建设等方面系统性完善生态流量管理与研究,实现流域水资源的高质量发展。

关键词：生态流量水资源流域生态流域管理可持续发展

来源：

维普期刊数据库

同方期刊数据库

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

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：