检索结果-南通市图书馆

Predicting changes in the suitable habitats of six halophytic plant species in the arid areas of Northwest China

Journal of Arid Land 2024年第10期16卷 1380-1408页

作者： YANG Ao TU Wenqin YIN Benfeng ZHANG Shujun ZHANG Xinyu ZHANG Qing HUANG Yunjie HAN Zhili YANG Ziyue ZHOU Xiaobing zhuang weiwei ZHANG Yuanming College of Life Sciences Xinjiang Normal University/Xinjiang Key Laboratory of Special Species Conservation andRegulatory Biology/Key Laboratory of Special Environment Biodiversity Application and Regulation in Xinjiang/KeyLaboratory of Plant Stress Biology in Arid LandUrumqi 830054China State Key Laboratory of Desert and Oasis Ecology Key Laboratory of Ecological Safety and Sustainable Development in AridLandsXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Biodiversity Conservation and Application in Arid Lands Xinjiang Institute of Ecology andGeographyChinese Academy of SciencesUrumqi 830011China Xinjiang Field Scientific Observation Research Station of Tianshan Wild Fruit Forest Ecosystem Yili Botanical GardenXinjiang Institute of Ecology and GeographyChinese Academy of SciencesXinyuan 835800China State Key Laboratory of Earth Surface Processes and Resource Ecology College of Life SciencesBeijing Normal UniversityBeijing 100875China University of Chinese Academy of Sciences Beijing 100049China College of Biological Sciences University of California DavisDavisCA 95616USA College of Ecology and Environment Xinjiang UniversityUrumqi 830017China College of Resources and Environment/Xinjiang Key Laboratory of Soil and Plant Ecological Processes Xinjiang AgriculturalUniversityUrumqi 830052China College of Grassland Science Xinjiang Agricultural UniversityUrumqi 830052China

In the context of changes in global climate and land uses,biodiversity patterns and plant species distributions have been significantly *** salinization is a growing problem,particularly in the arid areas of Northwest *** are ideal for restoring soil salinization because of their adaptability to salt *** this study,we collected the current and future bioclimatic data released by the WorldClim database,along with soil data from the Harmonized World Soil Database(v1.2)and A Big Earth Data Platform for Three *** the maximum entropy(MaxEnt)model,the potential suitable habitats of six halophytic plant species(Halostachys caspica(Bieb.)***.,Halogeton glomeratus(Bieb.)***.,Kalidium foliatum(Pall.)Moq.,Halocnemum strobilaceum(Pall.)Bieb.,Salicornia europaea L.,and Suaeda salsa(L.)Pall.)were assessed under the current climate conditions(average for 1970-2000)and future(2050s,2070s,and 2090s)climate scenarios(SSP245 and SSP585,where SSP is the Shared Socio-economic Pathway).The results revealed that all six halophytic plant species exhibited the area under the receiver operating characteristic curve values higher than 0.80 based on the MaxEnt model,indicating the excellent performance of the MaxEnt *** suitability of the six halophytic plant species significantly varied across regions in the arid areas of Northwest *** different future climate change scenarios,the suitable habitat areas for the six halophytic plant species are expected to increase or decrease to varying *** global warming progresses,the suitable habitat areas of ***,***,and *** exhibited an increasing *** contrast,the suitable habitat areas of ***,***,and *** showed an opposite ***,considering the ongoing global warming trend,the centroids of the suitable habitat areas for various halophytic plant species would migrate to different degrees,and four halophytic plant species,namely,S.

关键词： halophytes climate change global warming maximum entropy(MaxEnt)model soil salinization suitable habitats Northwest 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

Characteristics and drivers of the soil multifunctionality under different land use and land cover types in the drylands of China

引用

Regional Sustainability 2024年第3期5卷 99-110页

作者： SONG Boyi ZHANG Shihang LU Yongxing GUO Hao GUO Xing WANG Mingming ZHANG Yuanming ZHOU Xiaobing zhuang weiwei College of Life Sciences Xinjiang Normal UniversityUrumqi830054China State Key Laboratory of Desert and Oasis Ecology Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China Xinjiang Key Laboratory of Biodiversity Conservation and Application in Arid Lands Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China Xinjiang Field Scientific Observation Research Station of Tianshan Wild Fruit Forest Ecosystem Ili Botanical GardenXinjiang Institute of Ecology and GeographyChinese Academy of SciencesIli844900China University of Chinese Academy of Sciences Beijing100049China

The drylands of China cover approximately 6.6×106 km2 and are home to approximately 5.8×10^(8)people,providing important ecosystem services for human survival and ***,dryland ecosystems are extremely fragile and sensitive to external environmental *** use and land cover(LULC)changes significantly impact soil structure and function,thus affecting the soil multifunctionality(SMF).However,the effect of LULC changes on the SMF in the drylands of China has rarely been *** this study,we investigated the characteristics of the SMF changes based on soil data in the 1980s from the National Tibetan Plateau Data *** explored the drivers of the SMF changes under different LULC types(including forest,grassland,shrubland,and desert)and used structural equation modeling to explore the main driver of the SMF *** results showed that the SMF under the four LULC types decreased in the following descending order:forest,grassland,shrubland,and *** main driver of the SMF changes under different LULC types was mean annual temperature(MAT).In addition to MAT,pH in forest,soil moisture(SM)and soil biodiversity index in grassland,SM in shrubland,and aridity index in desert are crucial factors for the SMF ***,the SMF in the drylands of China is regulated mainly by MAT and pH,and comprehensive assessments of the SMF in drylands need to be performed regarding LULC *** results are beneficial for evaluating the SMF among different LULC types and predicting the SMF under global climate change.

关键词： Soil multifunctionality(SMF) Land use and land cover(LULC)changes Structural equation modeling(SEM) Climate change Dryland ecosystems

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

基于利率贴现模型的随机占优比较

引用

中国科学院大学学报（中英文） 2024年第4期41卷 433-441页

作者：庄玮玮杜先杨邱国新中国科学技术大学管理学院合肥230026 安徽新华学院商学院合肥230088

建立单笔投资的利率贴现模型按照一阶随机占优序、二阶随机占优序以及风险偏好型随机占优序递减的充分条件。若组合系数按超优序递减,投资组合情况下的利率贴现模型按照二阶随机占优序、风险偏好型随机占优序递减的充分条件也做了分析。

关键词：随机占优超优利率贴现模型投资组合

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

准噶尔无叶豆对邻近草本植物群落多样性的影响及其与土壤因子的关系

引用

草业科学 2024年第7期41卷 1583-1594页

作者：那尔格孜·阿力甫宋泊沂庄伟伟新疆师范大学生命科学学院/干旱区植物逆境生物学实验室新疆乌鲁木齐830054 新疆特殊环境物种保护与调控生物学实验室新疆乌鲁木齐830054 中亚区域有害生物联合控制国际研究中心新疆乌鲁木齐830054

为明确荒漠豆科植物对邻近草本植物群落物种多样性的影响及其与土壤因子的关系,以古尔班通古特沙漠优势豆科植物准噶尔无叶豆(Eremosparton songoricum)及其邻近草本植物群落为研究对象,采用野外调查法分析群落及物种多样性特征,综合对... 详细信息

为明确荒漠豆科植物对邻近草本植物群落物种多样性的影响及其与土壤因子的关系,以古尔班通古特沙漠优势豆科植物准噶尔无叶豆(Eremosparton songoricum)及其邻近草本植物群落为研究对象,采用野外调查法分析群落及物种多样性特征,综合对比准噶尔无叶豆与草本植物共存群落(LH)和仅草本植物群落(NH)的6种多样性指数,进一步运用冗余分析(RDA)探讨物种多样性与土壤因子之间的关系。结果表明:1)在NH群落中,共有植物8科11属11种,其中菊科植物种类最多;在LH群落中,共有植物4科6属6种,其中藜科植物种类最多。2)NH群落多样性指数H、D、R显著高于LH群落,优势度指数C则表现出相反的特征(P<0.05),说明NH群落物种丰富度相对较高,但物种分布优势性较差,LH群落中物种优势度较为突出。3)在垂直方向上,不同群落土壤有机碳(SOC)、有机质(SOM)、全氮(TN)随着土层深度的增加而逐渐减小,具有明显的“表聚性”特征;在相同土层中,LH群落显著高于NH群落(P<0.05)。4)冗余分析显示,对NH群落和LH群落物种多样性变化有显著性影响的主要土壤因子分别为土壤硝态氮(NO3--N)和全磷(TP)。综上所述,准噶尔无叶豆对邻近草本植物群落的物种多样性及环境因子具有一定的影响,存在准噶尔无叶豆的群落中草本植物物种丰富度低,但群落土壤结构较好,肥力更佳,具有群落优势性。

关键词：古尔班通古特沙漠准噶尔无叶豆植物群落物种多样性草本植物土壤冗余分析

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

Fractional-Degree Expectation Dependence

引用

Communications in Mathematics and Statistics 2023年第2期11卷 341-368页

作者： Jianping Yang Weiru Chen weiwei zhuang Department of Mathematical Sciences School of ScienceZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangPeople’s Republic of China International Institute of Finance School of ManagementUniversity of Science and Technology of ChinaHefei 230026AnhuiPeople’s Republic of China

We develop a fractional-degree expectation dependence which is the generalization of the first-degree and second-degree expectation *** motivation for introducing such a dependence notion is to conform with the preferences of decision makers who are mostly risk averse but would be risk seeking at some wealth *** investigate some tractable equivalent properties for this new dependence notion,and explore its properties,including the invariance under increasing and concave transformations,and the invariance under *** also extend our results to a combined fractional-degree expectation dependence notion includingε-almost firstdegree expectation *** applications on portfolio diversification problem and optimal investment in the presence of a background risk illustrate the usefulness of the approaches proposed in the present paper.

关键词： Expectation dependence Incomplete risk aversion Confined correlation aversion Optimal investment

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

The influence of biological soil crusts on ^(15)N translocation in soil and vascular plant in a temperate desert of northwestern China

引用

Journal of Plant Ecology 2015年第4期8卷 420-428页

作者： weiwei zhuang Alison Downing YuanMing Zhang Key Laboratory of Biogeography and Bioresource in Arid Land Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences818 Beijing RoadUrumqi 830011China University of Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049China Department of Biological Sciences Macquarie UniversityNSW 2109Australia

Aims Desert ecosystems are often characterized by patchy distribution of vascular plants,with biological soil crusts(BSC)covering interplant ***,few studies have comprehensively examined the linkage between BSC and vascular plants through nitrogen(N)or element *** objective of this study was to evaluate the ecological roles of BSC on N translocation from soil to the domi-nant herb Erodium oxyrrhynchum bieb.(geraniaceae)in a temper-ate desert in *** Isotopes(including 15N-glu,15N-NH4Cl and 15N-NaNo3)were used as a tracer to detect translocation of N in two types of desert soil(BSC covered;bare)to the dominant herb *** different forms of 15N-enriched N compounds were applied as a point source to small patches of BSC and to bare *** we measured isotopes(14N and 15N)and obtained the concentration of labeled-15N in both vascular plants and soils at different distances from substrate application Important Findings Plants of *** growing in BSC-covered plots accumulated moreδ15N than those growing in the bare ***,soil from b Ccovered plots showed a higher concentration of labeled-N irrespective of form of isotope,than did the bare *** concentration of dissolved organic N(15N-glu)in *** was higher than that of dis-solved inorganic N(15N-NH4Cl and 15N-NaNo3).soil covered by BSC also accumulated considerably more dissolved organic N than bare soil,whereas the dominant form of 15N concentrated in bare soil was dissolved inorganic *** analysis showed that the concentra-tion of labeled-N in plants was positively related to the concentration of labeled-N in soils and the N%recorded in *** study supports the hypothesis that BSC facilitates ^(15)N translocation in soils and vascular plants in a temperate desert of northwestern China.

关键词： biological soil crusts nitrogen translocation Erodium oxyrrhynchum temperate desert

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

概率论中的幂律分布

引用

曲阜师范大学学报（自然科学版） 2024年第3期50卷 117-122页

作者：袁敏李洁雪庄玮玮杨亚宁安徽医科大学卫生管理学院 230032 中国科学技术大学管理学院安徽省合肥市230026

幂律分布用于描述个体相互影响的复杂系统中的数量分布规律,是概率论与数理统计学中最重要的分布之一,然而在教学中甚少对其进行详细的介绍.该文将详细讨论幂律分布的定义及性质、常见的幂律分布以及幂律分布的应用,并结合具体实例通过... 详细信息

幂律分布用于描述个体相互影响的复杂系统中的数量分布规律,是概率论与数理统计学中最重要的分布之一,然而在教学中甚少对其进行详细的介绍.该文将详细讨论幂律分布的定义及性质、常见的幂律分布以及幂律分布的应用,并结合具体实例通过R软件进行数据分析,给出相关教学内容和教学方法的若干建议.

关键词：幂律分布齐夫定律异速生长克莱伯定律无标度社交网络帕累托分布

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

On the longitudinal shifts of the Agulhas retroflection point

引用

Acta Oceanologica Sinica 2024年第5期43卷 16-29页

作者： weiwei Zhang Xiaoyi Yang Wei zhuang Xiaohai Yan State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361002China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Center for Remote Sensing College of EarthOcean and EnvironmentUniversity of DelawareNewarkDE 19716USA Joint Center for Remote Sensing University of Delaware-Xiamen UniversityNewarkDE 19716USA and Xiamen 361002China

The Agulhas system is the strongest western boundary current system in the Southern Hemisphere and plays an important role in modulating the Indian-to-Atlantic Ocean water exchange by the Agulhas *** is difficult to measure in situ transport of the Agulhas leakage as well as the Agulhas retroflection position due to their intermittent *** this study,an innovative kinematic algorithm was designed and applied to the gridded altimeter observational data,to ascertain the longitudinal position of Agulhas retroflection,the stability of Agulhas jet stream,as well as its *** results show that the east-west shift of retroflection is related neither to the strength of Agulhas current nor to its *** analysis uncovers the connection between the westward extension of Agulhas jet stream and an anomalous cyclonic circulation at its northern side,which is likely attributed to the local wind stress curl *** confirm the effect of local wind forcing on the east-west shift of retroflection,numerical sensitivity experiments were *** results show that the local wind stress can induce a similar longitudinal shift of the retroflection as altimetry *** statistical and case study indicates that whether an Agulhas ring can continuously migrate westward to the Atlantic Ocean or re-merge into the main flow depends on the retroflection ***,the westward retroflection may contribute to a stronger Agulhas leakage than the eastward retroflection.

关键词： Agulhas system Agulhas leakage retroflection position local wind stress curl

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 variations in the growth status of declining wild apple trees in a narrow valley in the western Tianshan Mountains, China

引用

Journal of Arid Land 2022年第12期14卷 1413-1439页

作者： QIU Dong TAO Ye ZHOU Xiaobing Bagila MAISUPOVA YAN Jingming LIU Huiliang LI Wenjun zhuang weiwei ZHANG Yuanming Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology/Key Laboratory of Special Environment Biodiversity Application and Regulation in Xinjiang/Key Laboratory of Plant Stress Biology in Arid Land/College of Life Sciences Xinjiang Normal UniversityUrumqi 830054China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Kazakh Scientific Research Institute of Forestry and Agroforestry Astana 010000Kazakhstan

Malus sieversii(wild apple tree),only distributed in the Tianshan Mountains in Central Asia,is a tertiary relic species and an ancestral species of cultivated ***,existing natural populations of wild apple trees have been *** date,spatiotemporal variations in the growth status of declining wild apple trees and influencing factors in the narrow valley areas in the Tianshan Mountains remain *** this study,field investigation and sampling were carried out in three years(2016-2018)at four elevations(1300,1400,1500,and 1600 m)in the Qiaolakesai Valley(a typical longitudinal narrow valley in the Yili River Valley)of the western Tianshan Mountains in Xinyuan County,Xinjiang Uygur Autonomous Region,*** coverage,dead branch percentage,and 18 twig traits(these 20 parameters were collectively referred to as plant traits)were determined to comprehensively reflect the growth status of declining wild apple *** values of dead branch percentage ranged from 36%to 59%,with a mean of 40%.Year generally showed higher impact on plant traits than *** 2017 and 2018,projective coverage,leaf size,leaf nitrogen concentration,and nitrogen to phosphorous ratio were markedly higher than those in ***,dead branch percentage and leaf and stem phosphorous concentrations showed the opposite *** of the topological parameters of plant trait networks differed in the three years,but the strength of trait-trait association increased year by *** mean difference between day and night temperatures(MDT),annual accumulative precipitation,soil electrical conductivity,and soil pH had the greatest impact on the plant trait *** growth status of declining wild apple trees was directly and positively affected by MDT and leaf *** conclusion,the growth of declining wild apple trees distributed in the narrow valley areas was more sensitive to interannual environmental changes than elevation *** results are of great significa

关键词： Malus sieversii plant attributes plant trait network elevation gradient meteorological factor western Tianshan Mountains

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

A causal convolutional neural network for multi-subject motion modeling and generation

引用

Computational Visual Media 2024年第1期10卷 45-59页

作者： Shuaiying Hou Congyi Wang Wenlin zhuang Yu Chen Yangang Wang Hujun Bao Jinxiang Chai weiwei Xu State Key Lab of CAD&CG Zhejiang UniversityHangzhou310058China Xmov Shanghai200030China School of Automation Southeast UniversityNanjing210096China

Inspired by the success of WaveNet in multi-subject speech synthesis,we propose a novel neural network based on causal convolutions for multi-subject motion modeling and *** network can capture the intrinsic characteristics of the motion of different subjects,such as the influence of skeleton scale variation on motion ***,after fine-tuning the network using a small motion dataset for a novel skeleton that is not included in the training dataset,it is able to synthesize high-quality motions with a personalized style for the novel *** experimental results demonstrate that our network can model the intrinsic characteristics of motions well and can be applied to various motion modeling and synthesis tasks.

关键词： deep learning optimization motion generation motion denoising motion control

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

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：