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| 1 | Jurassic-Cretaceous Boundary Strata of the Somanakamura Group in NE Japan and their Correlation with Coeval Terrestrial Deposits in China显示文摘Defining the Jurassic-Cretaceous boundary is a controversy in stratigraphic study of the world. It has been widely accepted that this boundary can be defined at the bottom of Berriasian in Tethys, with the appearance of the ammonite Berriasella jacobi dating to ca. 145 Ma. However, it is difficult for the widespread terrestrial deposits in China to correlate with the international standard of marine facies. The Somanakamura Group in Japan is represented by a succession of marinecontinental transitional strata. It provides a bridge of marine and nonmarine stratigraphic correlation. The ammonite and radiolarian fossils preserved in this group suggest an age from Bajocian to early Valanginian. The J-K boundary was defined in or atop the Tomizawa Formation of the group according to the ammonite data. The present authors study the fossil spores and pollen newly found from the Tomizawa and Koyamada formations. Three assemblages have been recognized. They are Assemblage 1(Cyathidites-Classopollis) from the upper part of the Tomizawa Formation, Assemblage 2(Cyathidites-Jiaohepollis) from the lower part of the Koyamada Formation, and Assemblage 3(Cyathidites-Spheripollenites-Ephedripites) from the middle to upper part of the Koyamada Formation. With the reference of ammonite evidence, the J-K boundary can be defined between Assemblage 1 and Assemblage 2. This palynological J-K boundary can be correlated with that of terrestrial sequence in China. However, local biostratigraphy imply that the continental J-K boundary in China is of 135 or 137 Ma age. It has a considerable discrepancy from the marine standard. Biogeographically, the distribution pattern of spores and pollen in southern China is in accordance with that in the Somanakamura Group, which parallels the Tuchengzi Formation in northeastern China. By the palynological correlation between the Somanakamura Group and the strata in southern China, and then with the sequence in northeastern China, it is suggested that the continental J-K boundary is located in the Tuchengzi Formation. | LI Wei WAN Xiaoqiao Atsushi MATSUOKA ZHANG Shuqin QU Haiying Tsubasa TAMURA Kohei YOSHINO | 2015 | Acta Geologica Sinica(English Edition)2015，89，1： | 3 |
| 2 | Effects of different water levels on cotton growth and water use through drip irrigation in an arid region with saline ground water of Northwest China显示文摘 | Kang Yaohu Wang Ruoshui Wan Shuqin | 2012 | Agricultural Water Management2012，109，： | 1 |
| 3 | Soil salinity management with drip irrigation and its effects on soil hydraulic properties in north China coastal saline soils显示文摘 | SUN Jiaxia KANG Yaohu WAN Shuqin | 2012 | Agricultural Water Management2012，115，： | 1 |
| 4 | Effect of soil matric po tential on tomato yield and water use under drip irrigation condi tion显示文摘 | Wang Dan Kang Yaohu Wan Shuqin | 2007 | Agricultural Water Management2007，87，： | 1 |
| 5 | Effect of soil matric po tential on tomato yield and water use under drip irrigation condi- tion显示文摘 | Wang Dan Kang Yaohu Wan Shuqin | 2007 | Agricultural Water Management2007，87，： | 1 |
| 6 | Water and salt regulation and its effects on Leymus chinensis growth under drip irrigation in saline-sodic soils of the Songnen Plain显示文摘 | Liu Shuhui Kang Yaohu Wan Shuqin | 2011 | Agricultural Water Management2011，98，9： | 1 |
| 7 | Effect of soil matrie potential on tomato yield and water use under drip irrigation condition 显示文摘 | Wang Dan Kang Yaohu Wan Shuqin | 2006 | Agricultural Water Management2006，87，2： | 1 |
| 8 | Effect of soil matric potential on tomato yield and water use under drip irrigation condition显示文摘 | Wang Dan Kang Yaohu Wan Shuqin | 2007 | Agricultural Water Management2007，87，： | 1 |
| 9 | Effect of drip irriga- tion with saline water on tomato ( Lycopersicon esculentum Mill ) yield and water use in semi-humid area 显示文摘 | Shuqin Wan Yaohu Kang Dan Wang | 2007 | Agricultural Water Management2007，90，： | 1 |
| 10 | Effect of drip irrigation frequency on radish growth and water use显示文摘 | Shuqin Wan Yaohu Kang | 2006 | Irrigation Science2006，24，3： | 1 |
| 11 | Salt distribution and the growth of cotton under different drip irrigation regimes in a saline area显示文摘 | Wang Ruoshui Kang Yaohu Wan Shuqin | 2011 | Agricultural Water Management2011，100，1： | 1 |
| 12 | Effects of drip irrigation and cropping on soil salinity,ionic composition and waxy corn production in a severely saline and calcareous and gypsiferous soil显示文摘Drip technologies have been suggested as practical for irrigation under conditions of high salinity and for reclamation of saline soils.Drip irrigation triggered by soil water potential thresholds was applied to both reclaim a severely saline calcareous gypsiferous soil and irrigate a waxy corn crop(Zea mays L.sinesis Kulesh).However,there is a lack of knowledge on the sustainability of reclamation of saline soils with drip irrigation and the changes in soil salinity and salt ion composition during the amelioration process.Therefore,effects on soil salinity,its ionic composition,and on crop growth and yields were evaluated in an experiment conducted in the Yinchuan Plain,northwest China.Treatments included fields in their first to fourth years of the drip irrigation reclamation-cropping scheme and adjacent native,non-cropped or irrigated salinesodic land as control.Yield of waxy corn increased and days of growth to maturity decreased as a function of time and reclamation management.The improvement in crop performance could be largely credited to the reduction of soil salinity and changes in salt composition under the drip-irrigated reclamation protocols.The drip irrigation regime created a region of low salinity proximal to the emitters conducive to germination and plant growth.Deleterious ions for crop growth such as Na+and Cl^(-)were reduced while Ca2+and Mg2+concentration increased,especially in the upper 40 cm of soil.After only a single season of drip-irrigated waxy corn production,both Cl-SO_(4)^(2-)ratios and sodium adsorption ratio(SAR)decreased dramatically.The results suggested that drip irrigation is an effective technology for reclamation of severely saline-affected soils,such as those widely distributed over the Ningxia Plain in China and that this or similar reclamation strategy could be appropriate for reclamation of other hard to manage calcareous and gypsiferous soils. | Junli Tan Yaohu Kang Yanping Jiao Shuqin Wan Xina Wang Juncang Tian Ran Erel Alon Ben-Gal | 2023 | International Journal of Agricultural and Biological Engineering2023，16，5： | 0 |
| 13 | A Novel Material for Selective Separation of Mono-galactosyldiacylglycerols from Microalgae显示文摘Monogalactosyldiacylglycerols(MGDGs)have potential applications in food products,cosmetics and pharmaceuticals.MGDGs from microalgae with high amounts of polyunsaturated fatty acids(PUFAs)have potential functions,which arise the interest of the researchers.MGDGs were prepared by silica gel column chromatography with the appropriate mobile phase,while due to the similarity to molecular structure of MGDGs,digalactosyldiacylglycerols(DGDGs)were the most difficult impurities to separate during the extraction process of MGDGs from Nannochloropsis oceanica IMET1 and Arthrospira platensis.In order to obtain MGDGs from microalgae using low toxic solvent system,a novel material Click thiol-ene cysteine(Click TE-Cys)was employed to achieve its selective separation by differentiation of the hydrophilic interaction.The mixture of MGDGs and DGDGs standards were separated from each other by Click TE-Cys solid phase extraction(SPE),which was further confirmed by the result of LC-MS.The molecular interaction of MGDGs and DGDGs with Click TE-Cys demonstrated that DGDGs had more hydrogen bonds with Click TE-Cys material,which might cause a higher hydrophilic interaction.In this study,the Click TE-Cys material exhibited higher hydrophilicity with DGDGs and effectively separated MGDGs from 4 species microalgae by‘flow-through'mode using ethanol as mobile phase. | JIANG Junpeng YANG Miao CAO Xupeng WAN Huihui LIU Shuqin ZHONG Shijun YAN Jingyu XUE Song | 2021 | Journal of Ocean University of China2021，20，1： | 0 |
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