|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Spatiotemporal variations of Zr/Rb ratio in three last interglacial paleosol profiles across the Chinese Loess Plateau and its implications for climatic interpretation显示文摘The ratio of Zirconium to Rubidium (Zr/Rb) is suggested to be a better proxy for the East Asian winter monsoon strength than the widely-used grain size distribution. The rationale for the Zr/Rb proxy relies on the following assumptions: (1) Grain size fractionating characteristics during eolian dust transport should be archived in the Zr/Rb ratio records and this assumption is based on the premise that Zr is preferentially enriched in coarser grain size fraction while Rb tend to be enriched in finer grain size fraction; and (2) post-depositional weathering does not change the Zr/Rb ratio due to the immobility of these two elements. To examine these two assumptions, three last interglacial paleosols (S1) from Dingxi, Tianshui and Lantian, along a NW-SE transect across the Chinese Loess Plateau, were geo- chemically investigated. Our results show that the Rb concentration exhibits an increasing trend along the NW-SE transect both in the paleosol (S1) and the measured portions of the loess units (L1 and L2), being supportive to the assumption that Rb is enriched in the fine particles. But we also found that Rb loss did occur to some extent in the three profiles, contradicting to the presumption of Rb immobility during pedogenic processes. The Zr concentration exhibits an expected decreasing trend in the measured portions of the loess units and an unexpected increasing trend in the paleosol along the NW-SE transect. Moreover, the ratios of Zirconium to Hafnium (Zr/Hf) show different variation patterns between interglacial and glacial, implying that Zr-bearing minerals and their resident grain size frac- tions are probably not identical during interglacial and glacial. Thus, the assumption that Zr is enriched in coarse grain size fraction can no longer hold. We conclude that the final Zr/Rb value is not only de- pendent on grain size sorting processes but also on post-depositional alteration and source prove- nance. Under enhanced chemical weathering, especially when chemical index of alteration (CIA) is greater than 65, the Zr/Rb value loses its validity to be a reliable proxy for the winter monsoon strength. In addition, all the Zr/Rb value is constrained above 1.7, a minimum which is definitely modulated by all the three aforementioned factors. | WANG HaiBin LIU LianYou FENG ZhaoDong | 2008 | Chinese Science Bulletin2008，53，9： | 6 |
| 2 | Characteristics of stemflow for sand-fixed shrubs in Mu Us sandy land, Northwest China显示文摘Little work has been done on stemflow for desert shrubs in China. This study measured stemflow in two shrubs of Salix psammophila C. Wang et Chang Y. Yang and Artemisia sphaerocephala Krasch in Mu Us sandy land and established a relationship between stemflow and canopy characteristics, rainfall amount and intensity. During the experimental period, the amount of stemflow for S. psammophila and A. sphaerocephala accounted for 7.6% and 2.7% of the gross rainfall respectively. Statistical analysis showed that there was a significant positive linear correlation between rainfall and stemflow for the two shrubs; while the relationship between stemflow percentage and rainfall suggested that there existed a rainfall depth threshold of 3―5 mm for S. psammophila and 5―7 mm for A. sphaerocephala. Stemflow percentage positively increased with rainfall depth increasing before the rainfall depth threshold values had been reached but showed stability after the threshold. A stepwise regression analysis suggested that the shrubs with more branches, larger crown volume and smaller branch angle inclination tended to collect more volumes of stemflow. Moreover, stemflow amount and percentage increased with the maximum rain intensity increasing in 10 minutes (I10) and the stemflow percentage tended to increase quickly with I10 when it was less than 3.0 mm h-1 for S. psammophila and 2.0 mm h-1 for A. sphaero- cephala, and then showed stable trend with increasing of I10. | YANG ZhiPeng LI XiaoYan LIU LianYou WU JianJun HASI Eerdun SUN YongLiang | 2008 | Chinese Science Bulletin2008，53，14： | 6 |
| 3 | Determination of erodible particles on cultivated soils by wind tunnel simulation显示文摘The erodible particle size distribution, diameter range and separate content of three soils from semi-arid regions of China were determined at different wind velocities through wind tunnel simulation and dry sieving. It was demonstrated that soil erodibility by wind depends not only on the intrinsic soil properties, but also on the extrinsic erosion effect of the erosive winds. It was supposed that there existed general consistency in the mechanics of wind erosion on different soils. | Lianyou Liu Jianhua Wang Xiaoyan Li Yuzhang Liu Wanquan Ta Haimei Peng | 1998 | Chinese Science Bulletin1998，43，19： | 4 |
| 4 | The influence of different underlying surface on sand-duststorm in northern China显示文摘In thispaper,a quantitative research on the relationship between differentunderlying surface and sand-duststorm has been made by using 40 years meteorologicaldata offive differenttypes of underlying surface in northern China,which include farmland,grassland,sandland,gobiand saltcrust. These metrologicaldata comprise sand-duststorm days and strong wind days.By analyzing,we can find that there are certain correlations between the days of sand-dust storm and strong wind for differentunderlying surface,which has greatinfluence on sand-duststorm.Butthere are pronounced differences in differenttypes ofunderlying surface.The sand-duststorm days ofgrassland,gobiand saltcrust,with smallerinterannualvariation are obviously less than strong wind days.On the other hand,the sand-duststorm days offarmland and sandland increase evidently,even in many years,are much more than strong wind days.The differencesare mainly induced by the influencing mechanism of different underlying surface on sand-dust storm. Grassland, gobi and salt crust with stable underlying surface are not prone to sand-dust storm under strong wind condition. W hereas, the underlying surface offarmland and sandland isunstable,thatiseasy to induce sand-duststorm under strong wind condition. | SONG Yang QUAN Zhanjun LIU Lianyou YAN Ping CAO Tong | 2005 | Journal of Geographical Sciences2005，15，4： | 4 |
| 5 | Holocene climatic and environmental changes recorded in Baahar Nuur Lake core in the Ordos Plateau, Inner Mongolia of China显示文摘A 5.3 m lake core was drilled in Baahar Nuur Lake in the Ordos Plateau, and measurements of meangrain size, organic δ 13C (δ 13Corg), organic carbon content (TOC), C/N, carbonate content, carbonate δ 13C(δ 13Ccar) and δ 18O (δ 18Ocar) were conducted for retrieving the Holocene chronosequence of climaticchanges based on 15 AMS 14C dates. The record documented four major stages of climate change inthe Ordos Plateau: (IV) a cold and dry condition before ~7.65 14C ka BP; (III) a warm and humid stagebetween ~7.65 and ~5.40 ka BP; (II) a generally drier and cooler climate since ~5.40 ka BP with twohumid events occurring from ~4.70 to ~4.60 ka BP and from ~4.20 to ~3.70 ka BP, and (I) a dry climatecharacterized by complete desiccation of the lake after 3.70 ka BP. Stage III can be further divided intothree sub-stages: (IIIa) a warm and humid episode from ~7.65 to ~6.70 ka BP, (IIIb) a warm and relativelydry episode from ~6.70 to ~6.20 ka BP, and (IIIc) the magthermal and maghumid episode of the Holo-cene from ~6.20 to ~5.40 ka BP. | GUO LanLan FENG ZaoDong LI XinQing LIU LianYou WANG LiXia | 2007 | Chinese Science Bulletin2007，52，7： | 4 |
| 6 | Interaction among controlling factors for landslides triggered by the 2008 Wenchuan, China Mw 7.9 earthquake显示文摘2008 年 5 月 12 日 Mw 7.9 Wenchuan,中国地震触发了大约 200,000 山崩,它被很多个因素控制。这研究检验五个因素:斜坡角度,斜坡方面,岩性学,山峰地面加速(针网阵列),和差错站在一起( seismogenic 差错上的相对位置,即,挂的墙或矿脉基卒下盘),决定这些因素怎么并且是否控制co地震的山崩出现至少一个因素,独自或在音乐会行动,涉及支持或压制山崩。我们执行了一个多因素用从 2008 Wenchuan 地震的数据的统计分析。结果在陡峭的地形学描绘的区域显示出那或在充分的理由摇晃发生在地震期间的地方,比另外的区域在斜坡方面和山崩数字密度(LND ) 之间有一种更靠近的关系。在岩性学和 LND 价值之间的关系取决于针网阵列。接着,在 LND 价值和针网阵列之间的关系被岩性学也影响。另外, seismogenic 差错的挂的墙上的 co 地震的山崩上的岩性学的控制效果在矿脉基卒下盘上比那大。在这些因素之中检验相互作用能改进 co 地震的山崩出现的机制的理解。 | Lingling SHEN Chong XU Lianyou LIU | 2016 | Frontiers of Earth Science2016，10，2： | 4 |
| 7 | Disaster Risk Science:A Geographical Perspective and a Research Framework显示文摘In this article,we recall the United Nations’30-year journey in disaster risk reduction strategy and framework,review the latest progress and key scientific and technological questions related to the United Nations disaster risk reduction initiatives,and summarize the framework and contents of disaster risk science research.The object of disaster risk science research is the'disaster system'consisting of hazard,the geographical environment,and exposed units,with features of regionality,interconnectedness,coupling,and complexity.Environmental stability,hazard threat,and socioeconomic vulnerability together determine the way that disasters are formed,establish the spatial extent of disaster impact,and generate the scale of losses.In the formation of a disaster,a conducive environment is the prerequisite,a hazard is the necessary condition,and socioeconomic exposure is the sufficient condition.The geographical environment affects local hazard intensity and therefore can change the pattern of loss distribution.Regional multi-hazard,disaster chain,and disaster compound could induce complex impacts,amplifying or attenuating hazard intensity and changing the scope of affected areas.In the light of research progress,particularly in the context of China,we propose a threelayer disaster risk science disciplinary structure,which contains three pillars(disaster science,disaster technology,and disaster governance),nine core areas,and 27 research fields.Based on these elements,we discuss the frontiers in disaster risk science research. | Peijun Shi Tao Ye Ying Wang Tao Zhou Wei Xu Juan Du Jing'ai Wang Ning Li Chongfu Huang Lianyou Liu Bo Chen Yun Su Weihua Fang Ming Wang Xiaobin Hu Jidong Wu Chunyang He Qiang Zhang Qian Ye Carlo Jaeger Norio Okada | 2020 | International Journal of Disaster Risk Science2020，11，4： | 4 |
| 8 | Soil Macropore Structure Characterized by X-Ray Computed Tomography Under Different Land Uses in the Qinghai Lake Watershed, Qinghai-Tibet Plateau显示文摘Quantification of soil macropores is important to enhance our understanding of preferential pathways for water, air, and chemical movement in soils. However, the soil architecture of different land uses is not well understood in elusive alpine regions. The objective of this study was to quantify the architecture of soil macropores in a Kobresia meadow, farmland, and sand in the Qinghai Lake watershed of northeastern Qinghai-Tibet Plateau, China using X-ray computed tomography. Nine soil cores at 0–50 cm depth were collected at three sites with three replicates. At each site, the three collected cores were scanned using a GE Hi Speed FX/i medical scanner(General Electric, USA). To analyze soil architecture, the number of macropores, macroporosity, and mean macropore equivalent diameter within the 50 cm soil profile were determined from the X-ray computed tomography. Analysis of variance indicated that land use significantly influenced macroporosity, mean macropore equivalent diameter, and number of macropores. The soils of the Kobresia meadow and farmland had greater macroporosity and developed deeper and longer macropores than that of sand. For the Kobresia meadow, macropores were distributed mainly in the 0–10 cm soil layer, while they were distributed in the 0–20 cm soil layer for the farmland. The large number of macropores observed in the soils of the Kobresia meadow and farmland could be attributed to greater root development. The results of this study provided improved quantitative evaluation of a suite of soil macropore features with significant implications for non-equilibrium flow prediction and chemical transport modeling in soils. | HU Xia LI Zongchao LI Xiaoyan WANG Pei ZHAO Yunduo LIU Lianyou LU Yanli | 2018 | Pedosphere2018，28，3： | 3 |
| 9 | Ambient TSP concentration and dustfall variation in Urumqi,China显示文摘Total suspended particulate(TSP, particle diameter≤100 μm) was the dominant air pollutant and significantly influenced local air quality. In this paper, we investigated the interannual and seasonal variations of TSP and dustfall of the atmosphere over Urumqi, the capital city of Xinjiang Uygur autonomous region, northwestern China, basing on environmental monitoring records and meteorological data from 1986–2012. The results showed that during the study period, annual average TSP concentration decreased from 716 to 260 μg/m3, with an average level of 422.9 μg/m3, while dustfall intensity reduced from 350.4 to 166.6 t/(km2?a), with an average level of 259 t/(km2?a). Over 50% of the annual pollution days were induced mainly by TSP. Spring and winter had relatively higher dustfall intensities, and dense traffic and residential areas had the highest dustfall intensities in the Urumqi metropolitan area. With an annual average precipitation of less than 300 mm, atmospheric particulates in Urumqi could be hardly removed through wet deposition. During spring and summertime prevailing winds from northwest and northeast could carry aeolian dust particles from sandy deserts to Urumqi. Aeolian dusts from deserts would remain to be a priority regarding air pollution control in arid oasis cities. | XiaoXiao ZHANG Xi CHEN YuHong GUO ZiFa WANG LianYou LIU Cottle PAUL ShengYu LI HuaWei PI | 2014 | Journal of Arid Land2014，6，6： | 3 |
| 10 | A review of the research on complex erosion by wind and water显示文摘Complex erosion by wind and water, which is also called aeolian-fluvial interactions, is an important erosion process and landscape in arid and semiarid regions. The effectiveness of links between wind and water process, spatial environmental transitions and temporal environmental change are the three main driving forces determining the geomorphologic significance of aeolian-fluvial interactions. As a complex interrelating and intercoupling system, complex erosion by wind and water has spatial- temporal variation features. The process of complex erosion by wind and water can be divided into palaeoenvironmental process and contemporary process. Early work in drylands has often been attributed to one of two schools advocating either an ‘aeolianist’ or a ‘fluvialist’ perspective, so it was not until the 1930s that the research on complex erosion by wind and water had been conducted. There are two obstacles restricting the research of complex erosion by wind and water. Firstly, how to transform in different temporal and spatial scales is still unsettled; and secondly, the research methodology is still immature. In the future, the mechanism and control of erosion, the complex soil erodibility in wind and water erosion will be the focus of research on complex erosion by wind and water. | SONG Yang YAN Ping LIU Lianyou | 2006 | Journal of Geographical Sciences2006，16，2： | 3 |
| 11 | Scientific challenges of research on natural hazards and disaster risk显示文摘As a discipline,the science of natural hazards and disaster risk aims to explain the spatial-temporal pattern,process and mechanism,emergency response and risk mitigation of natural hazards,which requires a multidisci-plinary and interdisciplinary approach.With the support of Natural Science Finance of China(NSFC)and Chinese Academy of Sciences(CAS),in-depth research and systematic analysis on natural hazards and disaster risk were conducted.In this paper,the state of the art in research on natural hazards is summarized from seven aspects:formation process,mechanism and dynamic of natural hazards,disaster risk assessment,forecast,monitoring and early warning,disaster mitigation,emergency treatment and rescue,risk management and post-disaster re-construction.The trends within the natural hazards and disaster risk as a discipline were identified,along with existing shortcomings and significant gaps that need to be addressed.This paper highlighted:1)the scientific challenges including the frontier scientific issues and technological gaps on natural hazards and disaster risk dis-cipline from 2025 to 2035 in China,and 2)the proposal to develop a systemic and holistic natural hazards and disaster risk discipline. | Peng Cui Jianbing Peng Peijun Shi Huiming Tang Chaojun Ouyang Qiang Zou Lianyou Liu Changdong Li Yu Lei | 2021 | Geography and Sustainability2021，2，3： | 3 |
| 12 | Influence of pebble size and cover on rainfall interception by gravel mulch显示文摘 | Li Xiaoyan Shi Peijun Liu Lianyou | 2005 | Journal of Hydrology2005，312，1： | 1 |
| 13 | Wind tunnel measurements of adobe abrasion by blown sand: profile characteristics in relation to wind velocity and sand flux 显示文摘 | Liu Lianyou Gao Shangyu Shi Peijun | 2003 | Journal of Arid Environments2003，53，： | 1 |
| 14 | Influence of pebble size and cover on rainfall interception by gravel mulch显示文摘 | Li Xiaoyan Shi Peijun Liu Lianyou | 2005 | Journal of Hydrology2005，312，： | 1 |
| 15 | Influence of pebble size and cover on rainfall interception by gravel mulch显示文摘 | Li Xiaoyan Shi Peijun Liu Lianyou | 2005 | Journal of Hydrology2005，312，： | 1 |
| 16 | Effect of gravel mulch on Aeolian dust accumulation in the semiarid region of northwest China显示文摘 | Li xiaoyan Liu lianyou | 2003 | Soil and Research2003，70，： | 1 |
| 17 | Desertification and Blown Sand Disaster in China显示文摘 | Yanli Lyu Yanyan Yang Lanlan Guo Lianyou Liu Peijun Shi Guoming Zhang Zhiqiang Qu Xia Hu Jingpu Wang Yiying Xiong Haiming Wen Jie Lei Bo Liang Jiadong Dai | 2016 | Journal of Agricultural Science and Technology(A)2016，6，6： | 1 |
| 18 | Morphology, spatial pattern and sediment of Nitraria tangutorun nebkhas in barchans interdune areas of at the southeast margin of the Badain Jaran Desert, China显示文摘 | YanYan Yang LianYou Liu GuoMing Zhang Jie Lei HaiMing Wen YiYing Xiong | 2014 | Geomorphology2014，，： | 1 |
| 19 | Influence of pebble mulch on soil erosion by wind and trapping capacity for wind blown sediment显示文摘 | Li Xiaoyan Liu Lianyou Gong Jiadong | 2001 | Soil & Tillage Research2001，59，： | 1 |
| 20 | Influence of pebble size and cover on rainfall interception by gravel mulch 显示文摘 | Li Xiaoyan Shi Peijun Liu Lianyou | 2005 | Journal of Hydrology2005，312，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员