检索结果-南通市图书馆

Journal of Earth Science 2020年第4期31卷 723-734页

作者： shenqiang chen Hanlin chen School of Earth Sciences Zhejiang UniversityHangzhou 310027China Department of Earth Sciences ETH ZurichZurich 8092Switzerland

In the northwest of the Himalayan-Tibetan Orogen, the ~250 km-long Kongur Shan extensional system in the eastern Pamir was formed during the convergence between the Indian and Asian plates. Tectonic activity of the Kongur Shan normal fault and the Tashkurgan normal fault can help to reveal the origin of east-west extension along the Kongur Shan extensional system. The Kongur Shan fault has been extensively studied, while the Tashkurgan fault calls for systemic research. In this study, low-temperature thermochronology including apatite fission track analysis and apatite and zircon(U-Th)/He analyses is applied to constrain the timing of activity of the Tashkurgan fault. Results indicate that the Tashkurgan fault initiated at 10–5 Ma, and most likely at 6–5 Ma. The footwall of the Tashkurgan fault has been exhumed at an average exhumation rate of 0.6–0.9 mm/a since the initiation of the Tashkurgan fault. Combined with previous research on the Kongur Shan fault, we believe that the origin of east-west extension along the Kongur Shan extensional system was driven by gravitational collapse of over-thickened Pamir crust.

关键词： Pamir Late Cenozoic extension normal fault low-temperature thermochronology

Deformation geometry and timing of the Wupoer thrust belt in the NE Pamir and its tectonic implications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2016年第4期10卷 751-760页

作者： Xiaogan chenG Hanlin chen Xiubin LIN Shufeng YANG shenqiang chen Fenfen ZHANG Kang LI Zelin LIU School of Earth Sciences Zhejiang University Hangzhou 310027 China Research Center for Structures in Oil- and Gas-Bearing Basins Ministry of Education Hangzhou 310027 China Department of Exploration Geophysics College of Geophysics and Information Engineering China University of Petroleurn-Beijing Beijing 102249 China

The Pamir region, located to the northwest of the Tibetan Plateau, provides important information that can aid the understanding of the plateau＇s tectonic evolution. Here we present new findings on the deforma- tion geometry and timing of the Wupoer thrust belt at the northeastem margin of Pamir. Field investigations and interpretations of seismic profiles indicate that the eastern portion of the Wupoer thrust belt is dominated by an underlying foreland basin and an overlying piggy-back basin. A regional unconformity occurs between the Pliocene （N2） and the underlying Miocene （NI） or Paleogene （Pg） strata associated with two other local unconformities between Lower Pleistocene （Q1） and N2 and between Middle Pleistocene （Q2-4） and Q1 strata. Results of structural restorations suggest that compres- sional deformation was initiated during the latest Miocene to earliest Pliocene, contributing a total shortening magnitude of 48.6 km with a total shortening rate of 48.12%, most of which occurred in the period from the latest Miocene to earliest Pliocene. These results, com- bined with previous studies on the Kongur and Tarshkor- gan extensional system, suggest an interesting picture of strong piedmont compressional thrusting activity concur- rent with interorogen extensional rifting. Combining these results with previously published work on the lithospheric architecture of the Pamir, we propose that gravitational collapse drove the formation of simultaneous extensional and compressional structures with a weak, ductile middle crustal layer acting as a decollement along which both the extensional and compressional faults merged.

关键词： Pamir Kongur Wupoer gravitational collapse fold-and-thrust belt

在线全文

学校读者我要写书评

暂无评论

帕米尔弧形构造带新生代构造演化研究进展

地球科学进展 2014年第8期29卷 890-902页

作者：陈汉林陈沈强林秀斌浙江大学地球科学系浙江杭州310027 教育部含油气盆地构造研究中心浙江杭州310027

帕米尔弧形构造带有巨大的地壳缩短量、近双倍的地壳增厚、巨大的海拔高程、同造山伸展作用，对塔西南新生代构造变形、沉积和古气候影响重大。但是，对于帕米尔的构造过程尚存在争议。基于前人研究成果，可将帕米尔新生代构造演化过程... 详细信息

帕米尔弧形构造带有巨大的地壳缩短量、近双倍的地壳增厚、巨大的海拔高程、同造山伸展作用，对塔西南新生代构造变形、沉积和古气候影响重大。但是，对于帕米尔的构造过程尚存在争议。基于前人研究成果，可将帕米尔新生代构造演化过程归结如下：印度-欧亚板块的碰撞导致帕米尔在新生代早期开始构造抬升，并在新生代晚期持续抬升。帕米尔北缘的主帕米尔逆冲断裂（MPT）和帕米尔前缘逆冲推覆系（PFT）可能在早-中中新世开始活动；东缘喀喇昆仑断裂（KKF）北段的起始活动时间在早-中中新世，喀什-叶城走滑系统（KYTS）则于晚始新世-早中新世开始活动，表明帕米尔可能在约20MaBP开始呈弧形向北挤入欧亚板块。10～7MaBP帕米尔内部的公格尔伸展系统开始发育。至上新世，KKF北段停止活动；KYTS在晚中新世或上新世的走滑速率大幅减小，表明帕米尔与塔里木板块间的相对运动量在不断减少。对于帕米尔弧形构造带形成及其演化动力学机制的更清晰界定还有赖于构造过程时空分布、造山带与盆地以及地壳浅表与地球深部过程的系统研究。

关键词：帕米尔弧形构造带新生代板块碰撞构造活动运动学模型

上扬子西南部晚三叠世古隆起演化及其构造意义

在线全文

学校读者我要写书评

暂无评论

大地构造与成矿学 2017年第4期41卷 653-662页

作者：陈沈强朱民熊光耀曾庆周红飞陈汉林肖安成贾东浙江大学地球科学学院浙江杭州310027 中国石油西南油气田分公司勘探开发研究院四川成都610051 南京大学地球科学与工程学院江苏南京210093

在大量野外地质调查和资料分析的基础上,通过不同剖面的沉积特征和地层对比分析,识别出上扬子西南部存在晚三叠世古隆起;并结合区域构造背景,探讨了古隆起的构造属性、演化和大地构造意义。研究结果表明,上扬子西南部普遍缺失上三叠统,... 详细信息

在大量野外地质调查和资料分析的基础上,通过不同剖面的沉积特征和地层对比分析,识别出上扬子西南部存在晚三叠世古隆起;并结合区域构造背景,探讨了古隆起的构造属性、演化和大地构造意义。研究结果表明,上扬子西南部普遍缺失上三叠统,这一地层的缺失不是后期剥蚀造成的,而是由于上扬子西南部在晚三叠世存在一个与上扬子西南缘近平行的古隆起。该古隆起的发育与金沙江-哀牢山-马江-八布洋、甘孜-理塘洋的关闭及之后的碰撞造山作用密切相关。在早三叠世末,金沙江-哀牢山-马江-八布洋关闭,上扬子西南部南缘的右江和楚雄盆地成为前陆盆地,形成的前缘隆起共同组成了该古隆起;至晚三叠世诺利期,甘孜-理塘洋关闭,上扬子西南部西缘发育西昌前陆盆地,其前缘隆起与右江、楚雄前陆盆地的前缘隆起一起组成古隆起;至瑞替期末,由于右江前陆盆地停止发育,古隆起仅由楚雄和西昌前陆盆地的前缘隆起组成。这一古隆起的发现对研究四川盆地晚三叠世盆地原型和上扬子西南部构造演化具有重要意义。

关键词：上扬子晚三叠世古隆起前陆盆地构造演化

Effect of P fertilizer reduction regime on soil Olsen-P, root Fe-plaque P, and rice P uptake in rice-wheat rotation paddy fields

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第1期31卷 94-102页

作者： Hao chen Yu WANG Jiahui YUAN Wenbin ZHU Guanglei chen shenqiang WANG State Key Laboratory of Soil and Sustainable Agriculture Changshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China College of Resource and Environment University of Chinese Academy of Sciences.Beijing 100049China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China

In agricultural systems, it is vital to use limited yet optimal phosphorus(P) resources, because excessive P fertilizer application leads to the accumulation of P in soil, increasing the risk of environmental pollution and causing the waste and exhaustion of P resources. In a rice-wheat rotation system, omitting P fertilizer application in the rice-growing season is a good alternative;however, how this P fertilization reduction influences changes in P in the soil-root-aboveground system is unclear. In this study, after a seven-year rice-wheat rotation at the Yixing(YX) and Changshu(CS) sampling sites, China, compared with P fertilization in rice-and wheat-growing seasons(PR+W), reduced P fertilization(no P fertilizer application in either season, P0;P fertilization only in wheat-growing seasons, PW;and P fertilization only in rice-growing seasons, PR) did not result in substantial variation in crop biomass. The PW treatment did not reduce crop total P, root iron(Fe)-plaque P, and soil Olsen-P at three stages of rice growth(seedling, booting, and harvesting stages) at the YX and CS sites. In contrast, concentrations of soil Olsen-P, aboveground crop total P, and root Fe-plaque P decreased in the P0 treatment by 45.8%–81.0%,24.6%–30.9%, and 45.6%–73.4%, respectively. In addition, a significant negative correlation was observed between the root Fe-plaque P and crop biomass at the two sites. Significant positive correlations were also observed between root Fe-plaque P and root total P, crop total P, and soil Olsen-P. In addition, the results of a redundancy analysis revealed that soil alkaline phosphatase(ALP) played a major role in the supply of P in soil, and was closely associated with root Fe-plaque P. The results of this study will enhance the understanding of the changes in P in the soil-root-aboveground system, particularly under P fertilizer reduction regimes.

关键词： crop biomass crop total P iron plaque reduced P input rice-growth stage soil-root-aboveground system

Foxp3-924基因多态性与变应性结膜炎关系探讨

在线全文

学校读者我要写书评

暂无评论

中国实用眼科杂志 2014年第10期32卷 1187-1190页

作者：杨瑞明赖荷沙翔垠陈盛强谭颖谦刘志平郑瑜陈卫芳广州医科大学附属第二医院眼科广东510260

目的对尘螨诱导引起变应性结膜炎的患者行Foxp3-924 （rs2232365）基因分型,探讨Foxp3-924 （rs2232365）基因与尘螨变应性结膜炎遗传易感性的相关性.方法临床对照研究.对2007～2011年在广州医科大学附属第二医院眼科应用PCR-SSP技术... 详细信息

目的对尘螨诱导引起变应性结膜炎的患者行Foxp3-924 （rs2232365）基因分型,探讨Foxp3-924 （rs2232365）基因与尘螨变应性结膜炎遗传易感性的相关性.方法临床对照研究.对2007～2011年在广州医科大学附属第二医院眼科应用PCR-SSP技术为80例无亲缘关系的尘螨变应性结膜炎患者和103名无血缘关系的健康汉族人行Foxp3-924 （rs2232365）基因分型.结果 Foxp3-924位点AA基因型频率在变应性结膜炎患者与正常对照组相比差异无统计学意义[32.5％（26/80） vs.23.3％（24/103）,x 2=1.92,P＞0.05）;GA基因型在变应性结膜炎患者中的频率显著高于正常对照组,差异有统计学意义（x2=4.82,P＜0.05）.GG基因型在变应性结膜炎患者中的频率显著低于正常对照组,差异有统计学意义（x2=11.78,P＜0.01）.与正常人相比,Foxp3-924 A等位基因频率显著上升,G等位基因下降,差异有统计学意义（x2=9.77,P＜0.01）.结论 Foxp3-924位点基因多态性与变应性结膜炎显著相关.

关键词：尘螨,变应性结膜炎 Foxp3-924 (rs2232365) 多态性

Responses of soil phosphorus pools accompanied with carbon composition and microorganism changes to phosphorus-input reduction in paddy soils

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第1期31卷 83-93页

作者： Jiahui YUAN Lei WANG Hao chen Guanglei chen shenqiang WANG Xu ZHAO Yu WANG State Key Laboratory of Soil and Sustainable Agriculture Changshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Organic Food Development Center Nanjing Institute of Environmental SciencesMinistry of Environmental ProtectionNanjing 210042China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China

In rice-wheat rotation systems, changes in soil phosphorus(P) pools and microorganisms in rice-growing seasons have been studied;however, further investigations are required to test whether these indexes exhibit different responses in wheat-growing seasons. Additionally, such studies need to include potential variations in soil carbon(C) structure and microbial community composition. In this study, a long-term rice-wheat rotation P-input reduction experiment was conducted to observe the variations in soil P pools and C composition in the 7th wheat season and to investigate the responses of soil enzyme activity and microbial communities. Four P fertilization treatments were included in the experiment, i.e., P application for rice season only(PR), for wheat season only(PW), and for both rice and wheat seasons(PR+W) and no P application in either season(Pzero). Compared with PR+W treatment, Pzero treatment significantly decreased(P < 0.05) labile and stable P pools. Different P fertilization regimes altered soil microbial community composition and enzyme activity, whereas C composition did not vary. However, PW treatment resulted in relatively more O-alkyl-C than PR treatment and the highest number of microorganisms. Besides, the higher ratios of fungi/bacteria and Gram-positive bactetia/Gram-negative bactetia were related to labile C pools, particularly O-alkyl-C, as opposed to recalcitrant C. Our results clarified the status of soil P pools, C chemistry, and the response of microorganisms under dry-farming conditions in the P input-reduced rice-wheat rotation system.

关键词： 13C nuclear magnetic resonance dry farming enzyme activity microbial community composition phospholipid fatty acid phosphorus fractionation wheat season

Seven years of biochar amendment has a negligible effect on soil available P and a progressive effect on organic C in paddy soils

在线全文

学校读者我要写书评

暂无评论

Biochar 2022年第1期4卷 1161-1173页

作者： Jiahui Yuan Yu Wang Xu Zhao Hao chen Guanglei chen shenqiang Wang State Key Laboratory of Soil and Sustainable Agriculture Changshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of the Chinese Academy of Sciences Beijing 10049China

Little attention has been paid to how long-term application of crop straw and its biochar affects soil phosphorus(P)transformation and carbon(C)*** conducted a 7-year field experiment including control treatment(chemical fertilizer only,CK),straw return(2.25 t ha^(−1)),and different amounts of biochar addition(11.25 t ha^(−1)(0.5%BC)and 22.5 t ha^(−1)(1.0%BC),to investigate influence of these amendments on soil C structure,P fractions,and their interaction with *** 13C nuclear magnetic resonance and soil P sequence fractionation were applied to capture changes of soil C compositions and P *** to CK,straw and biochar amendments decreased alkyl C/O-alkyl C,which is conducive to increased soil organic *** 0.5%BC and 1.0%BC treatments enhanced recalcitrant aromatic C by 69.0%and 131%,*** to CK(101.2±33.32 mg kg^(−1)),the 0.5%BC and 1.0%BC treatments had a negligible effect on soil available P,while negative effects were observed in straw treatment(59.79±9.023 mg kg^(−1)).Straw and biochar amendments increased primary P and occluded P,whereas had negligible effect on organic *** analysis and correlation analysis indi-cated that C compositions and P pool correlated to microbial community composition and enzyme activities,and aromatic C was the most related ***,structural equation modeling indicated available P was most related to phosphatase activity and C *** findings reveal the changes of soil P and C response under long-term crop straw and its biochar amendment,and can contribute toward improving understanding of the effect of biochar and straw return in future agriculture management.

关键词： Biochar Paddy soil Soil phosphorus fractionation Carbon composition Microorganisms

Composition- and oxidation-controlled magnetism ternary FeCoNi nanocrystals

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

Nano Research 2016年第3期9卷 831-836页

作者： Maogang Gong Ridwan Sakidja shenqiang Ren Department of Mechanical Engineering Temple University Philadelphia PA 19122 USA Department of Physics Astronomy and Materials Science Missouri State University Springfield MO 65897 USA

Ternary FeCoNi metallic nanostructures have attracted significant attention due to their high saturation magnetization, unique mechanical properties, and large corrosion resistance. In this study, we report a controlled synthesis of ternary FeCoNi nanocrystals using solution-based epitaxial core-shell nanotechnology. The thickness and stoichiometry of the FeCoNi nanocrystals affect their magnetic characteristics, which can be controlled by a phase transformation-induced tetragonal distortion. Furthermore, surface oxidation of the stoichiometry-controlled FeCoNi nanostructures can drastically enhance their magnetic coercivity （up to 8,881.60e for AuCu-FeCo）, and optimize the AuCu-FeCo08Ni0.2 performance corresponding to the saturated magnetization of 134.4 emu-g-1 and coercivity of 4,036.70e, which opens the possibility of developing rare-earth free high energy nanomagnets.

关键词： iron-cobalt-nickel nanomagnetism magnetocrystallineanisotropy core-shell nanocrystals

Soil and microbial C:N:P stoichiometries play vital roles in regulating P transformation in agricultural ecosystems:A review

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

Pedosphere 2024年第1期34卷 44-51页

作者： Guanglei chen Jiahui YUAN shenqiang WANG Yuting LIANG Dengjun WANG Yiyong ZHU Yu WANG State Key Laboratory of Soil and Sustainable Agriculture Changshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China School of Life Sciences Jiangsu Normal UniversityXuzhou 221000China School of Fisheries Aquacultureand Aquatic SciencesAuburn UniversityAuburn AL 36849USA Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization College of Resources and Environmental ScienceNanjing Agricultural UniversityNanjing 210095China

Stoichiometry plays a crucial role in biogeochemical cycles and can modulate soil nutrient availability and functions. In agricultural ecosystems,phosphorus(P) fertilizers(organic or chemical) are often applied to achieve high crop yields. However, P is readily fixed by soil particles, leading to low P use efficiency. Therefore, understanding the role of carbon:nitrogen:P stoichiometries of soil and microorganisms in soil P transformation is of great significance for P management in agriculture. This paper provides a comprehensive review of the recent research on stoichiometry effect on soil P transformation in agricultural ecosystems. Soil microorganisms play an important role in the transformation of soil non-labile inorganic P to microbial biomass P by regulating microbial biomass stoichiometry. They also mobilize soil unavailable organic P into available P by changing ecoenzyme stoichiometry. Organic materials, such as manure and straw, play an important role in promoting the transformation of insoluble P into available P as well. Additionally, periphytic biofilms can reduce P loss from rice field ecosystems. Agricultural stoichiometries are different from those of natural ecosystems and thereby should receive more attention due to the influences of anthropogenic factors. Therefore, it is necessary to conduct further stoichiometry research on the soil biochemical mechanisms underlying P transformation in agricultural ecosystems. In conclusion, understanding stoichiometry impact on soil P transformation is crucial for P management in agricultural ecosystems.

关键词： ecoenzyme microbial biomass microbial community microorganism P availability periphytic biofilm soil P transformation