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1Lower Triassic Inorganic Carbon Isotope Excursion in Chaohu, Anhui Province, China显示文摘This paper reports a Lower Triassic inorganic carbon isotope profile from the North Pingdingshan Section in Chaohu, Anhui Province, China, which was situated in a deep part of the Lower Yangtze carbonate ramp. The δ ( 13 C) excursion shows two periods from the Permian Triassic boundary to the lower Spathian substage, corresponding to the ecosystem undergoing evolution and recovery after the end Permian mass extinction and related events. The first period starts at the δ ( 13 C) depletion caused by the mass extinction and evolves with a gradual δ ( 13 C) increase resulting from the development of some disaster taxa during the Induan. The strong Smithian δ ( 13 C) depletion in the second period might be formed by the collapse of the disaster ecosystem and the biotic recovery occurred with the explosive increase of bioproductivity in the Spathian. Thus the δ ( 13 C) excursion in the Lower Triassic expresses patterns of biotic evolution and recovery during the erratic ecosystem that followed the great end Permian mass extinction.Tong Jinnan Qiu Haiou Zhao Laishi Zuo Jingxun China University of Geosciences, Wuhan 430074 2002Journal of China University of Geosciences2002,13,2:26
2The characteristic differences of tropical cyclones forming over the western North Pacific and the South China Sea显示文摘The best track dataset of tropical cyclones in the western North Pacific (WNP) and the South China Sea (SCS) from 1977 to 2005 during the satellite era, the NCEP/NCAR reanalysis dataset and the extended reconstructed sea surface temperature dataset are employed in this study. The main climatological characteristics of tropical cyclone formation over the WNP and the SCS are compared. It is found that there is obviously different for the locations of tropical cyclone origins, achieving the lowest central pressure and termination points between over the WNP and over the SCS. The annual number of tropical cyclones forming over the SCS is obviously less than over the WNP, and there is a significant negative correlation with the correlation coefficient being -0.36 at the 5% significance level between over the WNP and over the SCS. The mean speed of tropical cyclone moving is 6.5 m /s over the WNP and 4.6 m /s over the SCS. The mean lowest central pressure of tropical cyclones is obviously weaker over the SCS than over the WNP. The tropical cyclone days per year, mean total distance and total displacement of tropical cyclone traveled over the WNP are all obviously longer than those over the SCS. Tropical cyclone may intensify to Saffir-Simpson hurricane scale 5 over the WNP, but no tropical cyclone can intensify to Saffir-Simpson hurricane scale 3 over the SCS. The changing ranges of the radii(R15,R16) of the 15.4 m /s winds them and the 25.7 m /s winds over the WNP are obviously wider than those over the SCS, and the median values of the radii over the WNP are also larger than those over the SCS. For the same intensity of tropical cyclones, both radii have larger medians over the WNP than over the SCS. The correlations of annual mean tropical cyclone size parameters between over the WNP and over the SCS are not significant. At the same time, the asymmetric radii of tropical cyclones over the WNP are different from those over the SCS.YUAN Jinnan WANG Dongxiao LIU Chunxia HUANG Jian HUANG Huijun 2007Acta Oceanologica Sinica2007,26,4:16
3A detailed Lower Triassic conodont biostratigraphy and its implications for the GSSP candidate of the Induan-Olenekian boundary in Chaohu, Anhui Province显示文摘Chaohu is located in a deep part of carbonate ramp on the Lower Yangtze Block,which belonged to the low-latitude eastern Tethyan archipelago during the Early Triassic.Fossils were very rich in the Lower Triassic of Chaohu.Bivalves,ammonoids,conodonts were very common throughout the Lower Triassic,while fish fossils were generally rich in some beds of the upper part.It is one of the most typical sections for the Early Triassic chronostratigraphy in the world.Although various fossils had been studied in the 1980s and 1990s,recent studies based upon new and more detailed collections from the Lower Triassic of Chaohu showed that the conodont zonation needs revision.We collected Lower Triassic conodont fossils from continuous sections of the West Pingdingshan,North Pingdingshan and South Majiashan,Chaohu,Anhui Province,and updated zonations were made for each section.Eight conodont zones have been dis- tinguished.They are,in ascending order,Hindeodus typicalis zone,Neogondolella krystyni zone,Neospathodus kummeli zone,Neospath- odus dieneri zone,Neospathodus waageni zone,Neospathodus pingdingshanensis zone,Neospathodus homeri zone,and Neospathodus anhuinensis zone.The first occurrence of Neospathodus waageni eowaageni of the N.w.eowaageni subzone(i.e.the base of the N.waageni zone)is suggested as the marker to define the Induan–Olenekian boundary.Laishi Zhao Jinnan Tong Zhiming Sun Michael J. Orchard 2008Progress in Natural Science:Materials International2008,18,1:16
4Ecological evolution across the Permian/Triassic boundary at the Kangjiaping Section in Cili County, Hunan Province, China显示文摘The stratigraphic sequence of calcimicrobialite facies at the Permian-Triassic (P/Tr) boundary has well recorded the biotic and environmental transition across the end-Permian catastrophic events. The biostratigraphy, microfacies, carbon isotopes, and fossil records across the P/Tr boundary have been studied at the Kangjiaping Section in Cili County, Hunan Province. Three biostratigraphic zones, Palaeofusulina-Colaniella Zone, Hindeodus parvus Zone, and Isarcicella staeschei Zone, are identified. The excursion of δ13Ccarb exhibits a sharp negative shift in the calcimicrobialite at the P/Tr boundary, which is roughly accordant with the abrupt bioclastic decline. In addition, five types of microfacies are recognized, including algal-foraminifer bioclastic limestone, algal-laminated calcimicrobial limestone, oolitic grainstone, vermiculate limestone, and intraclastic wackstone. The results indicate that the changeover of ecosystem from metazoan reef to calcimicrobialite in Cili is a classic case of marine ecological evolution during the Paleozoic-Mesozoic transition.WANG QinXian TONG JinNan SONG HaiJun YANG Hao 2009Science China Earth Sciences2009,52,6:14
5Sequence Stratigraphy of the Permian--Triassia Boundary Section of Changxing, Zhejiang, Southern China显示文摘Three third-order sequences and about one hundred high-frequency cycles or Milankovitchcycles within the Late Permian Changxingian to Early Triassic Griesbachian are identified in theMeishan Section of Changxing, Zhejiang Province, southern China, the candidate stratotype sec-tion of the global Permo-Triassic boundary, based on a detailed study of the biological,ecological and high-resolution allochthonous cyclic events, microfacies and depositional systems.Furthermore, the stacking pattern of the depositional systems across various Changxingian andGriesbachian sedimentary facies of the Lower Yangtze and the sequence stratigraphic frameworkare outlined with the Meishan section as the principal section. In this paper the habitat types offossil biota are applied to semiquantitative palaeobathymetry and the study of relative sea levelchanges.Zhang Kexin Tong Jinnan Yin Hongfu and Wu Shunbao China University of Geosciences, Wuhan, Hubei 1997Acta Geologica Sinica(English Edition)1997,71,1:14
6Anachronistic facies in the Lower Triassic of South China and their implications to the ecosystems during the recovery time显示文摘The end-Permian mass extinction not only severely distressed the Paleozoic ecosystems but also dramatically changed the sedimentary systems, resulting in a peculiar Early Triassic ecosystem and submarine environment during the recovery time following the mass extinction. The Lower Triassic is characteristic of the wide occurrence of various distinctive sediments and related sedimentary structures, such as flatpebble conglomerates, vermicular limestone, subtidal wrinkle structures, microbialite, carbonate seafloor fans, thin-bedded limestone and zebra limestone-mudstone. These sediments were common in the Precambrian to Early Ordovician marine settings, and then they occurred only in some extreme and unusual environments with the expansion of metazoan faunas. However, the Early Triassic witnessed an 'anachronistic' reappearance of some distinctive sedimentary records in normal shallow marine settings. The study of these anachronistic facies should be of great importance for the understanding of the unique ecosystem and marine environment through the great Paleozoic-Mesozoic transition. The anachronistic facies characterized by vermicular limestone have been documented in many localities in South China and occur at various horizons of the Lower Triassic. Most types of re- ported distinctive sediments over the world have been observed in the Lower Triassic of South China. This provides an excellent opportunity for understanding the Early Triassic environment and its co- evolution with the biotic recovery. Among the anachronistic facies the vermicular limestone is the most characteristic and common distinctive sediments in the Lower Triassic of South China but has received relatively few investigations. Taking it as a case study, we will detail the variation of vermicular limestone and its stratigraphic distribution in the Three Gorges area, Hubei Province. The investigation on the vermicular limestone and other distinctive sediments from the Lower Triassic of South China further indicates that the appearance of anachronistic facies immediately following the mass extinction and the elimination from normal shallow marine facies with the radiation of Mesozoic marine faunas imply the natural response of the sedimentary systems and ecosystems to the great Paleozoic-Mesozoic transitional events and their induced harsh environments. Therefore, the ups and downs of the anachronistic facies may act as a proxy for the evolution of ecosystems independent of fossil analyses.XiaoMing Zhao (1) (2) JinNan Tong (1) HuaZhou Yao (2) KeXin Zhang (1) Chen Zq (3) 2008Science China Earth Sciences2008,51,11:14
7Salvianolate increases heat shock protein expression in a cerebral ischemia-reperfusion injury model显示文摘Stroke remains a worldwide health problem.Salvianolate exerts a protective effect in various microcirculatory disturbance-related diseases,but studies of the mechanisms underlying its protective action have mainly focused on the myocardium,whereas little research has been carried out in brain tissue following ischemia-reperfusion.We assessed the neuroprotective effects of salvianolate in a rat model of cerebral ischemia-reperfusion injury induced using the suture method At onset and 24 and 48 hours after reperfusion,rats were intraperitoneally injected with salvianolate(18 mg/kg)or saline.Neurological deficit scores at 72 hours showed that the neurological functions of rats that had received salvianolate were significantly better than those of the rats that had received saline.2,3,5-Triphenyltetrazolium chloride was used to stain cerebral tissue to determine the extent of the infarct area.A significantly smaller infarct area and a significantly lower number of apoptotic cells were observed after treatment with salvianolate compared with the saline treatment Expression of heat shock protein 22 and phosphorylated protein kinase B in ischemic brain tissue was significantly greater in rats treated with salvianolate compared with rats treated with saline.Ou findings suggest that salvianolate provides neuroprotective effects against cerebra ischemia-reperfusion injury by upregulating heat shock protein 22 and phosphorylated protein kinase B expression.Jinnan Zhang Wei Lu Qiang Lei Xi Tao Hong You Pinghui Xie 2013Neural Regeneration Research2013,8,25:12
8The large increase of δ^(13)C_(carb)-depth gradient and the end-Permian mass extinction显示文摘Carbonate carbon isotope δ(13Ccarb) has received considerable attention in the Permian-Triassic transition for its rapid negative shift coinciding with the great end-Permian mass extinction event.The mechanism has long been debated for such a δ13Ccarb negative excursion through the end-Permian crisis and subsequent large perturbations in the entire Early Triassic.A δ13Ccarb depth gradient is observed at the Permian-Triassic boundary sections of different water-depths,i.e.,the Yangou,Meishan,and Shangsi sections,and such a large δ13Ccarb-depth gradient near the end-Permian mass extinction horizon is believed to result from a stratified Paleotethys Ocean with widespread anoxic/euxinic deep water.The evolution of δ13Ccarb-depth gradient combined with paleontological and geochemical data suggests that abundant cyanobacteria and vigorous biological pump in the immediate aftermath of the end-Permian extinction would be the main cause of the large δ13Ccarb-depth gradient,and the enhanced continental weathering with the mass extinction on land provides a mass amount of nutriment for the flourishing cyanobacteria.Photic zone anoxia/euxinia from the onset of chemocline upward excursion might be the direct cause for the mass extinction whereas the instability of chemocline in the stratified Early Triassic ocean would be the reason for the delayed and involuted biotic recovery.SONG HaiJun TONG JinNan XIONG YanLin SUN DongYing TIAN Li SONG HuYue 2012Science China Earth Sciences2012,55,7:11
9Lower Triassic and Induan-Olenekian Boundary in Chaohu,Anhui Province,South China显示文摘因为在 Chaohu 的西方 Pingdingshan 节在 2003 作为全球 Stratotype 节的候选人和 Induan-Olenekian 边界的点被建议,更低 Chaohu 三叠纪广泛地被学习了。基于研究在上更低 Chaohu 三叠纪,(1 ) 连续 conodont 带状配列被建立,它在世界上为更低的三叠纪的 stratigraphic 关联成为了一本重要参考书;(2 ) conodont Neospathodus waageni 的第一本外观资料被建议并且基本上作为主要标记被接受了定义 Induan-Olenekian 边界;(3 ) 碳同位素的一次典型更低的三叠纪的旅行被带到光并且被证明了为在结束的余殃的生态的环境的不安是为 stratigraphic 关联而且一个唯一的指示的一个优秀索引不仅 -- 二叠的集体扑灭;(4 ) 一个 magnetostratigraphic 序列在低纬度的区域与某个 biostratigraphic 控制被组成,它介绍重要关联给北方的顺序;(5 ) cyclostratigraphic 研究提供一个其他的方法抑制 chronostratigraphic 单位的年龄;并且(6 ) Olenekian 分的一个计划最近被建议定义在 Smithian 和 Spathian Substages 之间的边界。另外, Chaohu 也是 Chaohuan 舞台的类型地区,上面的舞台更低在中国 Chronostratigraphic 系统三叠纪。因此,更低 Chaohu 三叠纪在世界上是在华南,而且一个关键参考序列的不仅一个经典序列到相应地层学和地质的事件的调查。最近的成就为顺序的全面理解这里被看。然后, Induan-Olenekian 和 Smithian-Spathian 边界的当前的状况被讨论为以后的工作提供一本参考书。TONG Jinnan ZHAO Laishi 2011Acta Geologica Sinica(English Edition)2011,85,2:10
10Carbon dioxide emissions from cities in China based on high resolution emission gridded data显示文摘Based on the China high resolution emission gridded data(1 km spatial resolution), this article is aimed to create a Chinese city carbon dioxide(CO_2) emission data set using consolidated data sources as well as normalized and standardized data processing methods. Standard methods were used to calculate city CO_2 emissions, including scope 1 and scope 2. Cities with higher CO_2 emissions are mostly in north, northeast, and eastern coastal areas. Cities with lower CO_2 emissions are in the western region. Cites with higher CO_2 emissions are clustered in the Jing-Jin-Ji Region(such as Beijing, Tianjin, and Tangshan), and the Yangtze River Delta region(such as Shanghai and Suzhou).The city per capita CO_2 emission is larger in the north than the south. There are obvious aggregations of cities with high per capita CO_2 emission in the north. Four cities among the top 10 per capita emissions(Erdos, Wuhai, Shizuishan, and Yinchuan) cluster in the main coal production areas of northern China. This indicates the significant impact of coal resources endowment on city industry and CO_2 emissions. The majority(77%) of cities have annual CO_2 emissions below 50 million tons. The mean annual emission, among all cities, is 37 million tons. Emissions from service-based cities, which include the smallest number of cities, are the highest. Industrial cities are the largest category and the emission distribution from these cities is close to the normal distribution. Emissions and degree of dispersion, in the other cities(excluding industrial cities and service-based cities), are in the lowest level. Per capita C02 emissions in these cities are generally below 20 t/person(89%) with a mean value of 11 t/person. The distribution interval of per capita CO_2 emission within industrial cities is the largest among the three city categories. This indicates greater differences among per capita CO_2 emissions of industrial cities. The distribution interval of per capita CO_2 emission of other cities is the lowest, indicating smaller differences of per capita CO_2 emissions among this city category. Three policy suggestions are proposed: first, city CO_2 emission inventory data in China should be increased,especially for prefecture level cities. Second, city responsibility for emission reduction, and partitioning the national goal should be established, using a bottom-up approach based on specific CO_2emission levels and potential for emission reductions in each city. Third, comparative and benchmarking research on city CO_2 emissions should be conducted, and a Top Runner system of city CO_2emission reduction should be established.Bofeng Cai Jinnan Wang Shuying Yang Xianqiang Mao Libin Cao 2017Chinese Journal of Population,Resources and Environment2017,15,1:10
11A Review on the Global Stratotype Section and Point of the Permian-Triassic Boundary显示文摘This paper provides a synthetic review of researches on Meishan Section D, the Global Stratotype Section and Point of the Permian-Triassic Boundary (PTB). The history of research, geographic and geological setting of the section are briefly introduced. Changhsingian to “Griesbachian” conodont and ammonoid zonations, the most perfect Permo-Triassic zonations over the world, are presented, with a short discussion on the age of Otoceras. The Changhsingian to “Griesbachian” strata are subdivided into three 3rd order sequences, and the sedimentary structure of each sequence is indicated. The paper presents a correlation of the Changhsingian to “Griesbachian” magnetostratigraphy of the Meishan section with the general scale, and informed the negation of a short magnetic reversal at the PTB suggested by Zhu and Liu (1999). Recent developments of chemostratigraphy of δ 13C and δ 34S are introduced, especially the discovery of more than one negative δ 13C excursions across the PTB. Two important molecular researches reveal the profound changes at the base of eco-system, the microbial catastrophy, and the euxinic conditions in the photic zone during the Permian-Triassic superanoxic event. The paper reports the changes in dating the age of PTB since 2001. According to recent achievements, the age of volcanogenic claybed 25, 14 cm below the PTB, is now set at 252.4±0.3 Ma. A discussion on the eventostratigraphy concludes that, although there is a major event episode at beds 25–26, the events across the PTB at Meishan are multi-episodic and commenced prior to the Event Beds 25–26, thus the possibility that the mass extinction was mainly induced by an exterrestrial impact is largely excluded.YIN Hongfu TONG Jinnan ZHANG Kexin 2005Acta Geologica Sinica(English Edition)2005,79,6:10
12Cyclostratigraphy of the Induan (Early Triassic) in West Pingdingshan Section,Chaohu,Anhui Province显示文摘The Induan sequence in the West Pingdingshan Section, Chaohu, Anhui Province, displays a series of superimposed mudstone/limestone cycles. The lithological character of the cycles, combined with power spectral and wavelet analysis of magnetic susceptibility readings, reveals 12 short eccentricity and 56 precession Milankovitch cycles - obliquity cycles are not apparent. The uniformity of cycle thicknesses indicates a stable depositional setting making this section ideal to perform various geo-logical studies. Accordingly, the Induan Stage is estimated to have lasted 1.1 Ma, and the depositional rate for this part of the section is about 3.7 cm/ka. This places the Induan-Olenekian boundary in the West Pingdingshan Section at about 251.5 Ma based on an age of 252.6 Ma for the Permian-Triassic boundary.GUO Gang TONG JinNan ZHANG ShiHong ZHANG Jie BAI LingYan 2008Science China Earth Sciences2008,51,1:10
13Surveillance of Noise Exposure Level in the Manufacturing Industry—China,2020显示文摘Introduction:Occupational noise exposure is a widespread issue in the manufacturing industry in China.Since 2019,the National Surveillance System for Occupational Hazards in the workplace was established to understand different occupational hazards,especially occupational noise,in workplaces in China.Methods:Both environmental and individual noise exposure levels were measured for 19,378 enterprises according to the Work Plan for Surveillance of Occupational Hazards in the Workplace(2020)issued by National Health Commission of the People’s Republic of China.Median and interquartile range(IQR)were calculated to describe the distribution of the noise exposure level by industry classification,enterprise-scale,and ownership type of the enterprise.Results:Overall,25.14%of the individual noise exposure samples exceeded the Chinese national standard among the selected enterprises.The overall median of environmental noise exposure level was 82.8 dB(A)in selected enterprises,while the median of individual noise exposure level was 81.3 dB(A).The individual noise exposure level in the manufacture of metal products,manufacture of motor vehicles,minisized enterprises,collective enterprises and private enterprises was relatively high.Conclusion:Occupational noise is still one of the occupational hazards that cannot be ignored in the manufacturing industry,especially in mini-sized and private enterprises.The risk of noise exposure in the target industry is still high and will pose a threat to the health of workers.Jinnan Zheng Siyu Zhang Hongfei Wang Yue Yu Weijiang Hu 2021China CDC weekly2021,3,43:9
14Advance in the study of the Lower Triassic conodonts at Meishan Section, Changxing, Zhejiang Province显示文摘Meishan Section in Changxing County of Zhejiang Province is one of the four candidates of the global stratotype section and point (GSSP) of the Permian and Triassic boundary (PTB), and currently the conodonts have been widely accepted as the index fossils to define the Permian and Triassic boundary. The previous studies on the Lower Triassic conodonts at Meishan Section are summarized and the recent discovery of the Lower Triassic conodonts there is reported. The recognized data from the section indicate that Meishan is the best selection of the GSSP of PTB.Jinnan Tong Ying Yang 1998Chinese Science Bulletin1998,43,16:8
15Lower Triassic Smithian-Spathian Boundary at West Pingdingshan Section in Chaohu,Anhui Province显示文摘The West Pingdingshan Section in Chaohu, Anhui Province, has been extensively studied in recent years and become one of the classic Lower Triassic sequences well-clarified in multiple stratigraphies. Also it is an important section that defines the Smithian-Spathian (S-S) boundary within the Olenekian Stage. The S-S boundary strata at the section are restudied in high-resolution conodont biostratigraphy and carbon isotopes. The refined S-S boundary defined by the FAD of conodont Neospathodus pingdingshanensis is at 30 cm above the base of Bed 52, corresponding to a rapid diversification of conodonts. A sharp positive shift of δ13Ccarb curve co-occurs at the S-S boundary and it can be used as a key reference to define the boundary. The defined S-S boundary position and carbon isotopes curve can be well correlated globally.LIANG Dan TONG JinNan ZHAO LaiShi 2011Science China Earth Sciences2011,54,3:8
16Late Permian-Middle Triassic Sea Level Changes of Yangtze Platform显示文摘This paper first introduces procedures leading to the establishment of Late Permian-Middle Triassic sea level change curve of Yangtze platform. Bathymetric curves extracted from curve of habitat types are first transformed to sea level curves stage by stage. Comparison between curves of Yangtze and the world reveals that because the Late Permian marine sequences are lacking in most parts of the world, the Late Permian to Griesbachian curve of Yangtze may serve as an important reference for further revision of the world curve. The Early-Middle Triassic short-term changes of Yangtze are briefly concordant with those of Haq’s world curve, whereas their long-term changes are discordant. The latter, however, is representative of the East Asian regions affected by the Indosinian orogeny. Basically the third cycles of Yangtze and the world are only pertly concordant, and even in concordant cases their concrete boundaries are not coincident. This indicater that sea level changes are not strictly synchronous over the world. It seems that the 1st and 2nd cycles (supercycles and megacycles) may be world-wide, but not the 3rd cycles.Yin Hongfu Tong Jinnan (Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074) 1996Journal of Earth Science1996,15,1:7
17Discussion on Induan-Olenekian Boundary in Chaohu, Anhui Province, China显示文摘This paper proposes a scheme for the definition of the Lower Triassic Induan Olenekian boundary (IOB) based on investigation of sections in Chaohu, Anhui Province, China as well as data accumulated from other studies elsewhere. The conodont Neospathodus waageni is suggested as the index fossil of the boundary. According to the FAD of N. waageni , the IOB is at the base of bed 25 2 of the West Pingdingshan Section in Chaohu, 42.19 m above the Permian Triassic boundary, and it is slightly higher than the base of the Flemingites Euflemingites Ammonoid Zone at the section.Zhao Laishi Tong Jinnan Zuo Jingxun Ming Houli China University of Geosciences, Wuhan 430074 2002Journal of China University of Geosciences2002,13,2:7
18Quantitative standard of eco-compensation for the water source area in the middle route of the South-to-North Water Transfer Project in China显示文摘The Middle Route Project(MRP)of the Southto-North Water Transfer Scheme(SNWT)in China will require a very large financial expenditure to ensure the water supply and the associated water quality to northern China.An eco-compensation mechanism between the water service source areas and its beneficiaries is essential.This paper establishes an analytic framework of ecocompensation standard for the protection of the water source area,including both the calculation of ecocompensation based on opportunity cost method(OCM)and calculation of the burden sharing of eco-compensation between the water source area and the external water reception area based on the deviation square method(DSM).Taking Shiyan City,Hubei Province in China as a case study,our results show that the eco-compensation in the first-phase of MRP for the water source area in Shiyan,Hubei Province should be 1.63×10^(10) CNY,about four times of planned eco-construction investment budget(4.33×10^(9) CNY).In addition,the burden sharing of eco-compensation varied greatly in terms of different methods.It would be better to integrate the results of different single-factor burden sharing methods by determining the corresponding weighting coefficient with DSM and form one unanimous consent result by the interested parties.Zhanfeng DONG Jinnan WANG 2011Frontiers of Environmental Science & Engineering2011,5,3:7
19Policy and Practice Progress of Watershed Eco-compensation in China显示文摘The ecological protection of the watersheds in China is being confronted with a lot of problems such as soil and water erosion, water pollution at present. Therefore watershed eco-compensation is becoming a question of common interest. Based on the analyses of the major problems and their origins in the watershed protection in China, the paper discusses the concerned policies including relative rules and laws, financial policies and water right transaction policies. Simultaneously the paper reviews the practices carried out in China, including the ecological construction project in the western China, the trans-provincial eco-compensation practice and the small watershed eco-compensation practice. According to the present situation of eco-compensation practices and the future policy requirement, this paper finally puts forward four key problems to be solved in the watershed eco-compensation of China in the future.ZHANG Huiyuan LIU Guihuan WANG Jinnan WAN Jun 2007Chinese Geographical Science2007,17,2:6
20Griesbachian Cyclostratigraphy at MajiashanSection, Anhui Province, China显示文摘The Lower Triassic at Majiashan Section, deposited in the deep part of the Lower Yangtze carbonate ramp, is the only outcrop of the deep Lower Triassic preserved in the present Lower Yangtze region. Even so, the alternations of mudrock of mudrock and marl (or limestone) are still very distinct and recognizableable, though usually more or less condensed. The lithological and geochemical cycles at Majiashan Section are discussed in terms of the sedimentary characters and the contents of some elements analyzed at a 2-centimeter-interval with no hiatus of the Lower Triassic. The division resolution of the Griesbachian stratigraphy may increase to the scale of ten thousand years by the mudrock-marl (or limestone) bundles and the geochemical cycles. The analysis of the relationship between the sedimentary cycles/the geochemical cycles and the Milankovitch cycles may suggest the time limit and the sedimentary rates.Peng Yuanqiao Tong Jinnan Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 Gao Yongqun China University of Geosciences Press, Wuhan 430074 2001Journal of China University of Geosciences2001,12,1:6
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