检索结果-内蒙古大学图书馆

2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Leiming Zhang Key Laboratory of Ecosystem Network Observation and Modeling Synthesis Research Center of Chinese Ecosystem Research NetworkInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

来源：评论

学校读者我要写书评

暂无评论

Flood variability in the upper Yangtze River over the last millennium——Insights from a comparison of climate-hydrological model simulated and reconstruction

引用

Science China Earth Sciences 2023年第3期66卷 547-567页

作者： Ran HUO Hua CHEN Lu LI Chong-Yu XU Jingjing LI Si HONG Chesheng ZHAN Jun XIA State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Hubei Provincial Key Lab of Water System Science for Sponge City Construction Wuhan UniversityWuhan 430072China NORCE Norwegian Research Centre Bjerknes Centre for Climate ResearchJahnebakken 55007 BergenNorway Department of Geosciences University of OsloP.O Box 1047 Blindern0316 OsloNorway Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Water Cycle and Related and Surface Processes Chinese Academy of SciencesBeijing 100101China

Understanding hydrological responses to rising levels of greenhouse gases are essential for climate and impact *** is,however,often limited by a lack of long record of observational data to provide a basis for understanding the longterm behavior of the climate *** reconstructed data and(global climate and hydrological)model simulations will help us to better understand the variability of climate and hydrology over timescales ranging from decades to *** this study,we proposed an integrated approach to study flood variability in the upper reach of the Yangtze River over the last millennium to the end of the 21st *** accomplish this,we first drove hydrological models using the precipitation and temperature from four Global Climate Models(GCM),BCC-CSM1.1,MIROC,MRI-CGCM3,and CCSM4,to simulate daily discharge for the upper reach of the Yangtze River during the period of the last millennium(850–1849),historical period(1850–2005),and a future period(2006–2099).Then,we evaluated whether the modeled precipitation,temperature,and extreme discharge had statistical properties similar to those shown in the documented dry-wet periods,temperature anomalies,and paleoflood ***,we explored the extreme discharge variability using model *** results indicate that:(1)The MIROC-ESM model,differing from the other three GCM models,revealed positive temperature changes from the warm period(Medieval Climate Anomaly;MCA)to the cold period(Little Ice Age;LIA),while the temperature variability of the other models was similar to the records.(2)The BCC-CSM1.1 model performed better than the others regarding correlations between modeled precipitation and documented dry-wet periods.(3)Over most of the subbasins in the upper Yangtze River,the magnitude of extreme discharge in the BCC-CSM1.1 model results showed that there was a decrease from the MCA to the LIA period and an increase in the historical period relative to the cold period,whil

关键词： Climate change Flood variability Paleoflood records Climate-hydrological model Upper Yangtze River

来源：评论

学校读者我要写书评

暂无评论

温带森林沼泽植物化学多样性沿局域尺度土壤化学梯度的变化

引用

Journal of Plant Ecology 2023年第2期16卷 1-12页

作者： Xu-Yan Liu Yu-Kun Hu Beijing Key Laboratory of Wetland Services and Restoration Institute of Wetland ResearchChinese Academy of ForestryBeijing 100091China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

多种化学元素对于植物生长和生存、群落结构及植被功能具有至关重要的作用。化学多样性,即群落中植物元素含量的变异大小,能为深入探究植物养分策略和群落构建机制提供重要见解。然而,目前对于氮和磷以外的其它元素的化学多样性认识很少... 详细信息

多种化学元素对于植物生长和生存、群落结构及植被功能具有至关重要的作用。化学多样性,即群落中植物元素含量的变异大小,能为深入探究植物养分策略和群落构建机制提供重要见解。然而,目前对于氮和磷以外的其它元素的化学多样性认识很少,而且主要集中于植物地上部分。本研究通过对沿局域土壤化学梯度下的森林沼泽林下植物群落的调查,测定优势和亚优势植物叶片和细根11种元素含量,使用n维的超体积指数,探究了叶片和细根化学多样性的变化,及其与土壤因子间的关系。研究发现植物化学多样性随着土壤铝、锰、镁和锌含量的增加而减少,而与土壤氮、磷、钾、钠和铁含量及土壤pH和碳氮比之间没有关系。在控制物种多样性和土壤水分含量的影响后,这些变化格局仍然稳固。此外,叶和根化学多样性之间存在显著正相关,两者与土壤因子的关系相似。植物根化学多样性略高于叶化学多样性,但差异不显著。这些研究结果强调了局域尺度下土壤微量元素在决定植物化学多样性中的重要作用。植物叶和根化学多样性具相似的大小和格局,表明了在局域尺度下相似的环境因子驱动了植物地上与地下化学多样性。本研究结果对进一步认识土壤养分影响下的植物群落构建和生态系统功能具有重要的意义。

关键词：地上与地下联系环境梯度细根功能多样性超体积多元素微量元素

来源：评论

学校读者我要写书评

暂无评论

Precipitation mediates the temporal dynamics of net primary productivity and precipitation use efficiency in China's northern and southern forests

引用

ANNALS OF FOREST SCIENCE 2019年第3期76卷 1-12页

作者： Sun, Jian Zhou, Tiancai Du, Wenpeng Wei, Yanqiang Chinese Acad Sci Synth Res Ctr Chinese Ecosyst Res Network Key Lab Ecosyst Network Observat & Modelling Inst Geog Sci & Nat Resources Res Beijing 100101 Peoples R China Chinese Acad Sci Res Ctr Eco Environm Sci State Key Lab Urban & Reg Ecol Beijing 100085 Peoples R China Univ Chinese Acad Sci Coll Resources & Environm Beijing 100190 Peoples R China Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosystem Network Observat & Modeling Lhasa Plateau Ecosystem Res Stn Beijing 100101 Peoples R China Chinese Acad Sci Northwest Inst Ecoenvironm & Resources Key Lab Remote Sensing Gansu Prov Lanzhou 730000 Peoples R China

key message Precipitation mediates the dynamic of net primary productivity and precipitation use efficiency across the North-South Transect forests of China, which may result from an increase of productivity in warm temperate deciduous broad-leaved forests or a decrease of precipitation use efficiency in temperate coniferous broad-leaved mixed forests. Context Precipitation use efficiency (PUE), the ratio of net primary productivity (NPP) to annual precipitation, is one of the key factors that can clarify the response of forest ecosystem carbon and water cycles to ongoing climate change. Aims To investigate large-scale patterns of NPP and PUE, and to determine how NPP and PUE would respond to climate and soil variables across the North-South Transect forests (TNSTF) of China. Methods We revealed the spatial pattern dynamics of NPP and PUE in the TNSTF from 2000 to 2010 employing MOD17 NPP data and further explored the responses of NPP and PUE to environment factors across the TNSTF. Additionally, the temporal dynamics of NPP and PUE in different forest types and their dependencies on climate variation were investigated. Results The results indicated that NPP increased from 2000 to 2010 in most regions across the TNSTF. The spatial distribution pattern of NPP was mainly correlated with climate factors in the TNSTF rather than soil properties. Spatially, an increased trend of PUE (2000-2010) was found in the south and decreased PUE was revealed in the north of the TNSTF. In addition, the spatial distribution of PUE in the TNSTF was associated with both climate and soil factors. For different forests, only the NPP in warm temperate deciduous broad-leaved forests significantly increased (2000-2010, R-2 = 0.33, P < 0.05) due to the increase in precipitation (R-2 = 0.82, P < 0.0005). Moreover, only the PUE in temperate coniferous broad-leaved mixed forests presented a significantly decreasing trend (2000-2010, R-2 = 0.38, P < 0.05), which was significantly negatively corr

关键词： Precipitation use efficiency Net primary production Climate Forest ecosystem The north-south transect China

来源：评论

学校读者我要写书评

暂无评论

METHODS IN QUANTIFYING THE VARIATION OF WATER USE EFFICIENCY:BASED ON observationS OF CHINAFLUX

METHODS IN QUANTIFYING THE VARIATION OF WATER USE EFFICIENCY...

引用

2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Xianjin Zhu Guirui Yu Qiufeng wang Synthesis Research Center of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Graduate University of Chinese Academy of Scienees BeijingChina Synthesis Research Center of Chinese Ecosystem Research NetworkKey Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

来源：评论

学校读者我要写书评

暂无评论

Characterizing the Spatio-temporal Dynamics and Variability in Climate Extremes over the Tibetan Plateau during 1960–2012

引用

Journal of Resources and Ecology 2019年第4期10卷 397-414页

作者： ZHOU Yuke Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

Extreme climate events play an important role in studies of long-term climate change. As the Earth’s Third Pole, the Tibetan Plateau(TP) is sensitive to climate change and variation. In this study on the TP, the spatiotemporal changes in climate extreme indices(CEIs) are analyzed based on daily maximum and minimum surface air temperatures and precipitation at 98 meteorological stations, most with elevations of at least 4000 m above sea level, during 1960–2012. Fifteen temperature extreme indices(TEIs) and eight precipitation extreme indices(PEIs) were calculated. Then, their long-term change patterns, from spatial and temporal perspectives, were determined at regional, eco-regional and station levels. The entire TP region exhibits a significant warming trend, as reflected by the TEIs. The regional cold days and nights show decreasing trends at rates of-8.9 d(10 yr)-1(days per decade) and-17.3 d(10 yr)-1, respectively. The corresponding warm days and nights have increased by 7.6 d(10 yr)-1 and 12.5 d(10 yr)-1, respectively. At the station level, the majority of stations indicate statistically significant trends for all TEIs, but they show spatial heterogeneity. The eco-regional TEIs show patterns that are consistent with the entire TP. The growing season has become longer at a rate of 5.3 d(10 yr)^-1. The abrupt change points for CEIs were examined, and they were mainly distributed during the 1980 s and 1990 s. The PEIs on the TP exhibit clear fluctuations and increasing trends with small magnitudes. The annual total precipitation has increased by 2.8 mm(10 yr)^-1(not statistically significant). Most of the CEIs will maintain a persistent trend, as indicated by their Hurst exponents. The developing trends of the CEIs do not show a corresponding change with increasing altitude. In general, the warming trends demonstrate an asymmetric pattern reflected by the rapid increase in the warming trends of the cold TEIs, which are of greater magnitudes than those of the warm T

关键词： Tibetan Plateau(TP) climate extreme indices(CEIs) trend analysis change point Hurst exponent

来源：评论

学校读者我要写书评

暂无评论

EFFECTS OF CLIMATE CHANGE AND PLANTATION ON CARBON BUDGET OF CONIFEROUS FORESTS IN POYANG LAKE BASIN FROM 1981 TO 2008

EFFECTS OF CLIMATE CHANGE AND PLANTATION ON CARBON BUDGET OF...

引用

2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Shaoqiang Wang Yuan Yan Hao Nie Lei Zhou You Zhang Key Lab of Ecosystem Networking Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijingChina

来源：评论

学校读者我要写书评

暂无评论

Experimental warming shifts coupling of carbon and nitrogen cycles in an alpine meadow

引用

Journal of Plant Ecology 2021年第3期14卷 541-554页

作者： Song Wang Quan Quan Cheng Meng Weinan Chen Yiqi Luo Shuli Niu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Center for Ecosystem Science and Society Northern Arizona UniversityFlagstaffAZ 86011USA

Aims Terrestrial ecosystem carbon(C)uptake is remarkably regulated by nitrogen(N)availability in the ***,the coupling of C and N cycles,as reflected by C:N ratios in different components,has not been well explored in response to climate *** Here,we applied a data assimilation approach to assimilate 14 datasets collected from a warming experiment in an alpine meadow in China into a grassland ecosystem *** attempted to evaluate how experimental warming affects C and N coupling as indicated by constrained parameters under ambient and warming treatments *** Findings The results showed that warming increased soil N availability with decreased C:N ratio in soil labile C pool,leading to an increase in N uptake by ***,C input to leaf increased more than N,leading to an increase and a decrease in the C:N ratio in leaf and root,*** C:N ratio was decreased due to the increased N immobilization under high soil N availability or warming-accelerated decomposition of litter *** also increased C:N ratio of slow soil organic matter pool,suggesting a greater soil C sequestration *** most models usually use a fixed C:N ratio across different environments,the divergent shifts of C:N ratios under climate warming detected in this study could provide a useful benchmark for model parameterization and benefit models to predict C-N coupled responses to future climate change.

关键词： Bayesian probabilistic inversion Markov-Chain Monte-Carlo(MCMC) warming carbon and nitrogen cycles stoichiometry alpine meadow

来源：评论

学校读者我要写书评

暂无评论

The 30m-NDVI-based Alpine Grassland Changes and Climate Impacts in the Three-River Headwaters Region on the Qinghai-Tibet Plateau from 1990 to 2018

引用

Journal of Resources and Ecology 2022年第2期13卷 186-195页

作者： SUN Ziyu WANG Junbang National Ecosystem Science Data Center Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The response of long-term vegetation changes and climate change has been a hot topic in recent ***,a Landsat-based fusion model was developed and used to produce a dataset of normalized vegetation index(NDVI)for the Three-River Headwater region on the Qinghai-Tibet Plateau with a spatial resolution of 30 m and the time spanning the nearly 30 years from 1990 to *** this study,the NDVI was applied to an analysis of the spatial and temporal changes in the alpine grassland and the impacts from climate change using the Theil-Sen Median method and linear *** results showed that:(1)The regional mean NDVI was 0.39and showed a spatial pattern of decreasing from the southeast to the northwest in the recent three *** the three parks,the Lancang River Park had the highest NDVI(0.43),followed by the Yellow River Park(0.38)and Yangtze River Park(0.23).(2)An upward trending was found in the NDVI time series at a rate of 0.0031 yr^(-1)(R^(2)=0.62,P<0.01)over the whole period of 1990–*** increasing rate(0.00649 yr^(-1),R^(2)=0.71,P<0.01)in the latter period of 2005–2018 was nearly 2.3 times of that(0.00284 yr^(-1),R^(2)=0.31,P<0.01)in the previous period of1990–*** the latest periods,the three parks experienced rates that were 2.3 to 63 times the corresponding values in the early period.(3)The NDVI is correlated more positively with temperature than *** impacts of climate change decreased along with the coverage fraction from the higher,median and then lower *** climate change can explain 34%of the variability in the NDVI time series of the areas with a higher fraction of grassland coverage,while it was 31%for the median fraction and 20%for the lower *** study is the first to use the 30 m NDVI dataset spanning nearly 30 years to analyze the spatial and temporal variability and climate impacts in the alpine grasslands of the Three-River Headwater region of the Qinghai-Tibet *** results provide a

关键词： Normalized Difference Vegetation Index(NDVI) the Three-River Headwater region alpine grassland climate change

来源：评论

学校读者我要写书评

暂无评论

Spatial variation in annual actual evapotranspiration of terrestrial ecosystems in China: Results from eddy covariance measurements

引用

Journal of Geographical Sciences 2016年第10期26卷 1391-1411页

作者：郑涵于贵瑞王秋凤朱先进何洪林王艳芬张军辉李英年赵亮赵风华石培礼王辉民闫俊华张一平 Synthesis Research Center of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research CAS State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment CAS University of Chinese Academy of Sciences Institute of Applied Ecology CAS Northwest Institute of Plateau Biology CAS South China Botanical Garden CAS Key Lab of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden CAS

Understanding the spatial variation in annual actual evapotranspiration （AET） and its influencing factors is crucial for a better understanding of hydrological processes and water resources management. By synthesizing ecosystem-level observations of eddy-covariance flux sites in China （a total of 61 sites）, we constructed the most complete AET dataset in China up to now. Based on this dataset, we quantified the statistic characteristics of AET and water budgets （defined as the ratio of AET to annual mean precipitation （MAP）, AET/MAP） of terrestrial ecosystems in China. Results showed that AET differed significantly among both different vegetation types and climate types in China, with overall mean AET of 534.7＋232.8 mm yr1. AET/MAP also differed significantly among different climate types, but there were no distinct differences in AET/MAP values across vegetation types, with mean AET/MAP of 0.82＋0.28 for non-irrigated ecosystems. We further investigated how the main climatic factors and vegetation attributes control the spatial variation in AET. Our findings revealed that the spatial variation of AET in China was closely correlated with the geographical patterns of climate and vegetation, in which the effects of total annual net radiation （Ro）, MAP and mean annual air temperature （MAT） were dominant. Thus, we proposed an empirical equation to describe the spatial patterns of AET in China, which could explain about 84% of the spatial variation in AET of terrestrial ecosystems in China. Based on the constructed dataset, we also evaluated the uncertainties of five published global evapotranspiration products in simulating site-specific AET in China. Results showed that large biases in site-specific AET values existed for all five global evapotranspiration products, which indicated that it is necessary to involve more observation data of China in their parameterization or validation, while our AET dataset would provide a data source for it.

关键词： evapotranspiration water budget spatial variation eddy covariance terrestrial ecosystem China-FLUX

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：