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Root Effect of Three Vegetation Types on Shoreline Stabilization of Chongming Island,shanghai

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Pedosphere 2010年第6期20卷 692-701页

作者： DU Qin,ZHONG Qi-Cheng and wang Kai-Yun shanghai Key Laboratory of Urbanization and Ecological Restoration,east china normal univ.rsity,shanghai 200062.(china) shanghai Key Laboratory of Urbanization and Ecological Restoration East China Normal University Shanghai 200062 (China)

Coastal erosion is currently a major problem along the southern coast of Chongming Island, shanghai. To enhance the erosion protection ability of coastal shelterbelts, two woody tree species, Taxodium ascendens and Salix babylonica, were planted separately into Phragmites australis ＋ Scirpus mariqueter communities in 2006. Two years later, we investigated whether either of these experiments reduced erosion and increased stability in the native herbaceous plant community. We also examined soil stability and root length density under T. aseendens added, S. babylonica added and native herbaceous vegetation conditions along an intertidal gradient from the soil surface to a depth of 40 cm in each experiment, thus to determine the capacity of T. ascendens and S. babylonica to contribute to shoreline stabilization. Topsoil under the native vegetation had greater stability at the middle and higher intertidal zones because its soil stability index and root length density were significantly higher than in the T. ascendens or S. babylonica planted communities. The effect of T. ascendens on soil stability was not generally better than that of the native vegetation. Only at the 20-30 cm soil depth of the middle intertidal zone and in the 10-20 cm layer of the higher intertidal zone the soil stability index and root length densities under the T. ascendens added condition were significantly higher （P 〈 0.05） than those of the native vegetation. The S. babylonica planted soil had greater stability in the deeper soil layer than the soil under either the native vegetation or the T. ascendens added condition, and its soil stability index and root length density were significant higher （P 〈 0.05） than those of other vegetation conditions at the 30 40 cm soil depth for the lower intertidal zone and at the 20-40 cm layer for middle and higher intertidal zones.

关键词： coastal erosion root length density Salix babylonica soil stability index Taxodium ascendens

Third-order optical nonlinearities for lanthanum (Ⅲ) complexes with 1,10-phenanthroline components

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Chinese Science Bulletin 1998年第5期43卷 399-402页

作者： SUN Zhenrong, wang Shenyi, HUANG Yanping, LIN Jiyun,DING Liangen and wang ZugengLaboratory for Quantum Optics, east china normal univ.rsity, National Education Commission Department of Physics, east china normal univ.rsity, shanghai 200062. china Laboratory for Quantum Optics East China Normal University National Education Commission China Department of Physics East China Normal University Shanghai China

The nonlinear refractive indexes n 2 for the ethanol solutions of 1,10-phenanthroline (2.0×10 -3 mol·L -1), [bis(1,10-phenanthroline) lanthanum (Ⅲ)] nitrate (1.0×10 -3 mol·L -1), and [nitrato-fluoracil-bis (1,10-phenanthroline) lanthanum (Ⅲ)] nitrate (1.0×10 -3 mol·L -1) are first measured, the third-order nonlinear optical susceptibilities χ (3) and are calculated, and the mechanisms of the third-order optical nonlinearities enhanced by lanthanum (Ⅲ) are discussed preliminarily.

关键词： Z-scan third-order optical nonlinearity lanthanum (Ⅲ) 1 10-phenanthroline.

Denitrification in Chongming east tidal flat sediment, Yangtze estuary, china

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Science china Earth Sciences 2006年第10期49卷 1090-1097页

作者： wang Dongqi1,2, CHEN Zhenlou1,3, XU Shiyuan1,2, HU Lingzhen1 & wang Jun1,2 1. College of Resources & Environment, east china normal univ.rsity, shanghai 200062. china 2. State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics, east china normal univ.rsity, shanghai 200062. china 3. Key Laboratory of Geographical Information Science of Ministry of Education,east china normal univ.rsity,shanghai 200062. china College of Resources & Environment East China Normal University Shanghai China State Key Laboratory of Estuarine and Coastal Sediment Dynamics and Morphodynamics East China Normal University Shanghai China Key Laboratory of Geographical Information Science of Ministry of Education East China Normal University Shanghai China

From July 2003 to July 2004, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2O) production rate was very low in the water, Chongming east tidal flat (CM) sediment was the N2O source of the water. Sediment N2O natural production rate was between -0.08 and 1.74 μmolN·m-2·h-1. N2O natural production rate was higher in the summer. The difference of the N2O natural production rate in the different tidal flats, the correlation between the N2O natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat sediment denitrification was the main process of the N2O production, while in the low tidal flat sediment, the production of the N2O came from several processes of the nitrogen cycling. Tidal flat sediment denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the sediment denitrification rate was wide, from 1.12 to 33.34 μmolN·m-2·h-1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat sediment denitrification.

关键词： Yangtze estuary, tidal flat sediment, denitrification, nitrous oxide, effect factor.

A MONOTONE COMPACT IMPLICIT SCHEME FOR NONLINEAR REACTION-DIFFUSION EQUATIONS

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Journal of Computational Mathematics 2008年第2期26卷 123-148页

作者： Yuanming wang Department of Mathematics,east china normal univ.rsity,shanghai 200241,china Division of Computational Science,E-Institute of shanghai univ.rsities,shanghai normal Benyu Guo Department of Mathematics,shanghai normal univ.rsity,shanghai 200234,china Division of Computational Science,E-Institute of shanghai univ.rsities,shanghai,china Department of Mathematics East China Normal University ShangHai Department of Mathematics Shanghai Normal University ShangHai

A monotone compact implicit finite difference scheme with fourth-order accuracy in space and second-order in time is proposed for solving nonlinear reaction-diffusion equations. An accelerated monotone iterative method for the resulting discrete problem is presented. The sequence of iteration converges monotonically to the unique solution of the discrete problem, and the convergence rate is either quadratic or nearly quadratic, depending on the property of the nonlinear reaction. The numerical results illustrate the high accuracy of the proposed scheme and the rapid convergence rate *** iteration.

关键词： Nonlinear reaction-diffusion equation Monotone compact implicit scheme High accuracy Monotone iteration Rapid convergence rate.

Denitrification in tidal flat sediment, Yangtze estuary

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Science china Chemistry 2007年第6期50卷 812-820页

作者： wang DongQi1,2, CHEN ZhenLou1, XU ShiYuan1, DA LiangJun1, BI ChunJuan1 & wang Jun1 1 School of Resources and Environment Science, east china normal univ.rsity, shanghai 200062. china 2 School of Life Science, east china normal univ.rsity, shanghai 200062. china School of Resources and Environment Science East China Normal University Shanghai China School of Life Science East China Normal University Shanghai China

Sediment denitrification rates at six Yangtze River estuary tidal flat locations(mudflats and salt marshes)were measured from July 2003 to October *** winter and summer,spatial distribution of denitrification rates was not great in the Yangtze estuary,while in spring and autumn,denitrification rates had a great spatial distribution because of the human activity *** temporal change of denitrification rates was *** ranged from 0.2 to 36.4 umolN·m^(-2)·h^(-1),and were higher in the *** annual average of sediment denitrification rate was 18.2±12.3 mu molN · m^(-2)· h^(-1)in the middle tidal flat and 15.1 ±9.45 mu molN·m^(-2)·h^(-1)in the low tidal flat in the Yangtze *** analysis indicated that the temperature was the primary factor controlling the process of denitrification(significant positive correlation,P<0.01);at the same time,the content of sediment total nitrogen(TN)and the molar ratio of sediment carbon and nitrogen(C/N)had significant positive correlation(P<0.05)and negative correlation(P<0.05)with denitrification rates,*** the Yangtze estuary,increasing of water salinity had no significant inhibition of denitrification because of the wide change range of water salinity.

关键词： Yangtze estuary, tidal flat sediment, denitrification, effect factors

Variation of peroxidase isoenzyme and biofilm of Phanerochaete chrysosporium in continuous membrane bioreactor for Reactive Brilliant Red X3-B treatment

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Journal of Environmental Sciences 2009年第7期21卷 940-947页

作者： GAO Shang, CHEN Cheng, TAO Fang, HUANG Minsheng, MA Lihua, wang Zhonghua, WU Linhui School of Resource and Environment Science, east china normal univ.rsity, shanghai 200062. china. School of Resource and Environment Science East China Normal University Shanghai 200062 China

The influence of a Reactive Brilliant Red X-3B （RBR X-3B） dye on the peroxidase isoenzyme ofPhanerochaete chrysosporium was determined, and the biofilm structure in a white rot fungal continuous membrane bioreactor （MBR） was also investigated by scanning electron microscope （SEM）. The variation of peroxidase isoenzyme and the decolorization rate in the continuous MBR were evaluated. The results showed that the 100 mg/L RBR X-3B could stimulate the production of the peroxidase isoenzyme in the shaking-flask culture. In addition, two new peroxidase isoenzyme bands with relative mobility （Rf） value of 0.27 and 0.28 appeared, but the activity was lower than the blank control of 11 d. In the continuous MBR, the system worked stably during the first 60 d, the main peroxidase isoenzyme bands existed and three new bands with Rf value of 0.10, 0.27, and 0.28 appeared. Meanwhile, the biofilm grew well and the average decolorization rate could reach 90.6%. But the bands of peroxidase isoenzyme decreased rapidly at day 65, only two bands with Rf value 0.24 and 0.26 existed, and the decolorization rate decreased to 78.3%. Therefore, 5 bottles of P. chrysosporium mycelial pellet were added into the MBR, and then the activity of the peroxidase isoenzyme and the decolorization rate had a slight recovery. Finally, the decolorization rate finally decreased to 75.2%. These results contribute to a comprehensive understanding of the variation of peroxidase isoenzyme and biofilm in continuous MBR by white rot fungi.

关键词： Phanerochaete chrysosporium continuous membrane bioreactor Reactive Brilliant Red X3-B peroxidase isoenzyme pattern

A new approach to the synthesis of diacetals(diketals) pentaerythritol catalyzed by SO_3H-functionalized ionic liquids

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Chinese Chemical Letters 2010年第5期21卷 524-528页

作者： Yuan Yuan wang,Yan Nan Xu,Zhi Zhong wang,Li Yi Dai shanghai Key Laboratory of Green Chemistry and Chemical Process,Department of Chemistry, east china normal univ.rsity,shanghai 200062.china shanghai Key Laboratory of Green Chemistry and Chemical Process Department of Chemistry East China Normal University Shanghai 200062 China

In this article,an efficient,simple and environmentally friendly approach to the synthesis of diacetals(diketals) pentaerythritol using SOH-functionalized ionic liquids(ILs) as catalysts was *** ILs show high catalytic activity and reusability with good to excellent yields of the desired *** method has been used to determine the acidity order of these ionic liquids and the results are consistent with the catalytic activities observed in acetalization *** product yield of 93%was observed on using[PSPy][OTf]as catalyst and it can be reused at least 8 times without obvious activity loss.

关键词： SO3H-functionalized ionic liquids Diacetals(diketals) pentaerythritol Catalyze Hammett method Reusability

Two-photon Induced UV Fluorescence in Photo-active Spiropyran Molecules

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Chinese Journal of Lasers 1995年第2期B4卷 101-104页

作者： CHI Lunguang wang Zugeng(Department of Physics, east china normal univ.rsity,Joint Laboratory for Quantum Optics, shanghai Institute of Optics &. Fine mechanics,Academia Sinica and east china normal univ.rsity, shanghai 200062. china) east china normal univ Shanghai China

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关键词： spiropyran merocyanine two-photon absorption UV fluorescence

DRY/WET CLIMATE CHANGE SINCE 960 *** TAIHU DRAINAGE BASIN OF china

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Chinese Geographical Science 2001年第4期11卷 57-63页

作者： wang Zhang-hua, CHEN Zhong-yuan, KOU Ying, CHEN Yu (Department of Geography, east china normal univ.rsity, shanghai 200062. P. R. china) Department of Geography East China Normal University Shanghai P. R. China

ABSTRACT: The present study reconstructs an annual dry/wet grade series from 960 A. D. to 1992 A. D. in the Tai-hu drainage basin of eastern coast, china by collecting historical climatic records, to examine the climate periodicity and climate jumps. Power Spectrum analysis reveals that the dry/wet climate in the study area was a superposed phenomenon with the major period of quasi-100-year, and several other notable periods. These periods were supposed to be closely linked with the celestial activity. Climate jumps are detected using moving t-test. The two abrupt changes around 1247 - 1263 A. D. and 1618 - 1635 A. D. are proved as regional events. The 14th to 15th century appeared as the wettest period during the last 1000 years in the Taihu drainage basin. These are interpreted as the consequence of east Asia climate change.

关键词： climate periodicity climate jump annual dry/wet grade series Taihu drainage basin