检索结果-南通市图书馆

Isotopic feature and uranium dating of the volcanic rocks in the Okinawa Trough

在线全文

学校读者我要写书评

暂无评论

中国科学：地球科学英文版 2006年第4期49卷 375-383页

作者： HUANG Peng1,2, LI Anchun1, HU Ningjing2,3. FU Yongtao1& MA Zhibang4 1. institute of Oceanology, chinese academy of sciences, Qingdao 266071, china 2. Graduate School of the chinese academy of sciences, Beijing 10003., china 3. institute of soil science, chinese academy of sciences, nanjing 210008, china 4. institute of Geology and Geophysics, chinese academy of sciences, Beijing 100029, china institute of Oceanology Chinese Academy of Sciences Qingdao China Graduate School of the chinese academy of sciences Beijing China institute of soil science Chinese Academy of Sciences Nanjing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Volcanic rocks from the northern and middle Okinawa Trough were dated by ura- nium-series dating method. Differential fractions using magnetic procedure were designed to separate samples. New report on the ages and isotopic data of rocks in the northern trough (especially black pumice) was discussed. Based on the uranium dates and Sr-Nd isotopic ratio, magmatic evolution process of the Okinawa Trough was noted. Firstly, there have been wide silicic volcanic activities in the Okinawa Trough from late Pleistocene to present, and the volcanic rocks can be divided into three subgroups. Secondly, magma generally came from PREMA source area under the Okinawa Trough. Magmatic evolution in the northern trough was similar to the middle, but different to the south. Finally, volcanic activities indicated that opening of the southern Okinawa Trough did not happen due to the collision between Luson Arc and Eurasian Plate until the early Pleistocene.

关键词： Okinawa Trough, black pumice, uranium-series dating, Sr-Nd isotopic ratio, magmatic evolution.

TNF-α Regulates the Effect of Glutamine on Protein Synthesis in Rats

在线全文

学校读者我要写书评

暂无评论

TNF-α Regulates the Effect of Glutamine on Protein Synthesi...

Quantitative Relationship Between Land Use and Phosphorus Discharge in Subtropical Hilly Regions of china

中华医学会整形外科学分会第十一次全国会议、中国人民解放军整形外科学专业委员会学术交流会、中国中西医结合学会医学美容专业委员会全国会议

作者： Jihong Zhou1,Yousheng Li2,Fangnan Liu2,Yacheng Cao3.Zijian Hong1,Jieshou Li2 (l.Dpatment of burns and Plastic Surgery,nanjing General Hospital of nanjing Command,nanjing 210002,{3. 2. Research institute of General Surgery,nanjing General Hospital of nanjing Command,nanjing 210002,{3. 3. institute of soil science,chinese academy of sciences,{13.,{3.)

*** of the main roles of glutamine is to improve nitrogen balance by stimulating protein synthesis in *** has been widely used,such as in critical illness and ***,a systemic review showed that addition of glutamine to nutritional regimens for septic patients is not as effective as for trauma patients, especially in the early stage of *** present studies were performed to disclose the possible mechanism. *** aim of this study was to determine whether the regulation of glutamine on protein synthesis could be inhibited by TNF-αin rat. Materials and *** male SD rats,weighing 160-180g,were assigned randomly into four groups:A,B, C,D(n=10).All rats received isonitrogenous and isocaloric total parenteral nutrition(TPN) solutions for 3.days,group A were supplemented only by TPN;group B were infused intravenously with TNF-a in the third 24 hours;group C were given by glutamine TPN for 3.days,group D supplemented by glutamine and TNF-α.At the last 0.5 hour,all animals were mainlined with[L-15N]leucine. Plasma levels of TNF-α,glutamine concentration in plasma and tissues were measured after 72 hours,and the fractional synthesis rate(FSR) were assessed with stable isotope. *** TNF-αlevel of group A is higher than that of group C(7.903.2.119 versus 2.442±1.926,P3.9±216.76 versus 11673.767±108.774,P3.6.766±5.045 in group A to 3.8.750±5.045 in group B,403.5164±4.43. in group C,40.816±19.916 in group D,but in tissues,it elevates evidently from group A,to C,B D(compared with any two groups,P<0.01). However,the FSR was improved significantly from B to A, D,C. *** results indicated that TNF-αcould increase the levels of glutamine in plasma and tissues and attenuate promoting protein synthesis of glutamine in tissues.

关键词： TNF Regulates the Effect of Glutamine on Protein Synthesis in Rats

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Pedosphere 2003年第1期13卷 67-74页

作者： YANG JINLING and ZHANG GANLINinstitute of soil science, the{3., nanjing 210008 (china) institute of soil science the Chinese Academy of Sciences Nanjing 210008 (China)

The increase of phosphorus concentration is a crucial factor causing the eutrophication of water body,while land use has an important impact on agricultural non-point sources (NPS) phosphorus discharge. Sevensites controlling the water in four sub-watersheds and the main exit of the Meicun Watershed of XuanchengCounty, Anhui Province, were investigated by dynamic monitoring of stream water and nutrient discharge,integrating interpretation of aerial image and GIS analysis to find out how the land use affects phosphorusloss with stream water in typical agriculture-forest watershed in subtropical china. These monitored sitesare different in structure of land use. Phosphorus concentration of the stream water was analyzed everyweek and at the next day of rainfall. The velocity of flow was measured by kinemometer to calculatethe runoff flux and phosphorus discharge. The results showed that the runoff flux and the discharges ofdissolved phosphorus (DP), particle-associated phosphorus (PAP) and total phosphorus (TP) had significantexponential relationships with the area percentages of forest, pond and paddy field. There existed a significantlinear relationship between the TP and PAP concentrations in stream water and the area percentages of forest,pond and paddy field, and the discharge of PAP was also significantly linearly correlated with the dischargeof suspended soil particles. There was a logarithmic linear relationship between DP and PAP discharges. Thestudy indicated that the adjustment of land use patterns and construction of ecologically sound landscapewould be an important measure to reduce the runoff discharge of phosphorus. The results would be veryuseful in building the best management practices (BMPs) of agricultural watershed in subtropics.

关键词： land use phosphorus runoff watershed

Effects of chlorothalonil and carbendazim on nitrification and denitrification in soils

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2009年第4期21卷 458-467页

作者： LANG Man, CAI Zucong State Key Laboratory of soil and Sustainable Agriculture, institute of soil {3., chinese academy of sciences,nanjing 210008, china State Key Laboratory of soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China

The effects of chlorothalonil and carbendazim on nitrification and denitrification in six soils in upland and rice paddy environments were investigated. Laboratory aerobic （60% water holding capacity） and anaerobic （flooded） conditions were studied at 25℃ and fungicide addition rates of 5.5 mg/kg A. I. （field rate, FR）, 20 times （20FR） and 40 times （40FR） field rate, respectively. The results indicated that chlorothalonil at the field rate had a slight inhibitory effect on one soil only, and that soil did not nitrify much in the first place. But chlorothalonil at higher rates inhibited nitrification significantly in all soils. For soils JXP and JXU with a pH of less than 5.0, chlorothalonil almost completely stopped their nitrification at 20FR and 40FR during the whole 14 d incubation period. For soils HNP and HNU with a pH of greater than 8.0, chlorothalonil also significantly inhibit nitrification at 20FR and 40FR （p 〈 0.05）. However, NH4＋ that was added to the soil was also almost completely nitrified by the end of the incubation period in these two soils. The effects of chlorothalonil at 20FR and 40FR on the nitrification of JSP and JSU soils, with a pH of 5.4 and 7.2, respectively, were intermediate between the other soil types. Chlorothalonil had no effect on denitrification at the field rate and had little effect at the higher rates of application in some soils. Carbendazim had essentially no effect on nitrification and denitrification in soils assessed.

关键词： fungicide nitrification denitrification chlorothalonil carbendazim

Nutrient Discharges from a Typical Watershed in the Hilly Area of Subtropical china

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2003年第1期13卷 23-30页

作者： ZHANG GANLIN, YANG JINLING and ZHAO YUGUOinstitute of soil science, the{3., nanjing 210008 (china) institute of soilscience the Chinese Academy of sciences Nanjing 210008

Agriculture is still the biggest contributor of non-point source (NPS) pollution to water bodies andrunoff discharges of nutrients and other chemicals are one of the most important pathways. This studywas conducted during 1998～1999 in a typical watershed with complex agriculture and forestry systems aswell as dotted farmer villages, in a transitional region between the mid- and northern subtropical zones ofchina. Continuous sampling of stream water was performed regularly at a weekly frequency, with additionalsampling after all major rainfall events. The discharges of N and P nutrients and suspended materials weremeasured and the total and area-averaged annual discharges of all components were calculated. The resultsshowed an uneven seasonal distribution of nutrient discharges with summer storms contributing most tothe total fluxes. This study demonstrated a high dependence of runoff volume on rainfall but the overallrunoff coefficients were dependent on land use type and watershed size. The area-averaged annual dischargesvaried greatly among the sub-watersheds with different sizes and land use structures. This is the first studyestimating the area-averaged annual discharges of N and P in the hilly areas of subtropical china, which were1.5 g m-2 a-1 and 0.1 g m-2 a-1, respectively, providing important reference values for the assessment ofregional agricultural non-point source pollution.

关键词： discharge nutrients runoff subtropical china watershed

SOTER-Based soil Water Erosion Simulation in Hainan Island

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2003年第2期13卷 139-146页

作者： ZHAO YUGUO, ZHANG GANLIN and GONG ZITONGinstitute of soil science, the{3., nanjing 210008 (china) institute of soil science the Chinese Academy of Sciences Nanjing 210008 (China)

The actual and potential water erosion rates of soils with different landcovers in Hainan Island, china, were estimated based on the universal soil loss equation (USLE) anda 1:200000 soils and Terrain Digital Database (SOTER) database, from which soil water erosionfactors could be extracted. 92.8% of the whole island had a current erosion rate of lower than 500 tkm^(-2) a^(-1). soil erosion risk was considered to be high because of its abundant *** vegetation cover, the potential soil erosion rate would be extremely high and 90.8% of theisland would have a soil erosion rate higher than 2500 t km^(-2) a^(-1). Relative erosionvulnerability of different soil zones, landform types, and lithological regions of the island wascompared by introducing a relative erosion hazard parameter a. Cambosols developed from siltstoneand mudstone in low hill regions were pinpointed as soils with the highest erosion risk in theisland.

关键词： hainan island soil erosion risk assessment SOTER USLE

Cu and Zn Speciation in an Acid soil Amended withAlhalline Biosolids

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2002年第2期12卷 165-170页

作者： LUO YONGMINGinstitute of soil science, the{3., nanjing 210008 (china) institute of soil science the Chinese Academy of sciences Nanjing 210008

Fractionation of metals in acid sandy loam soil amended withalkaline-stabilised sewage sludge biosolids was conducted in order toassess metal bioavailability and environmental mobility. soilsolution was extracted by a centrifugation and filtration *** speciation in the soil solution was determined by a cationexchange resin method. Acetic acid and EDTA extracting solutions wereused for extraction of metals in soil solid surfaces. Metaldistribution in different fractions of soil solid phase wasdetermined using a three-step sequential extraction scheme.

关键词： alkaline-stabilised sewage sludge chemical speciation Cu granite soil

Some Fertility Characteristics and Fertilizer Requirements of a Newly Reclaimed Upland Red soil Derived from Quaternary Red Clay

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2000年第4期10卷 373-382页

作者： MA MAOTONG and XIE JIANCHANG (institute of soil science, the{3., nanjing 210008 china) 中科院南京土壤所江苏南京 210008

A series of field experiments from 1990 to 1994 in Yingtan, Jiangxi Province, were conducted on an upland red soil derived from Quaternary red clay which had been reclaimed three years before the experiments, in order to study the fertility characteristics and fertilizer requirements of the newly reclaimed soil. The field experiments included that on nutrient characteristics and fertilizer effect, that on K-supplying potential and K-Mg relationship, that on fertilization rates of K and N, etc. The newly reclaimed upland soil was low in both N and P, and its responses to nitrogen and phosphate application were very significant. The K-supplying potential was also low, so the soil was highly responsive to K fertilizer. The effect of Ca and Mg fertilizers was not so great for the reason that certain amounts of Ca and Mg were incorporated into the soil through application of calcium magnesium phosphate during land leveling before the experiments. Among the four micronutrients, B, Mo, Zn and Cu, B had the greatest effect on the soil. The fertilizer requirements of the soil were in an order of P and N > K > lime and B > Mg > Mo, Zn and Cu. Eight crops tested had different fertilizer-requiring characteristics. Rapeseed was very sensitive to P and B fertilizers. Barely was especially sensitive to P and lime and it also responded to B, Mo, Zn and Cu. And sweet potato was especially sensitive to K.

关键词： fertility characteristics fertilizer requirement newly reclaimed upland soil

An XPS Study of Nitrogen Structures in soil Humic Substances

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2001年第4期11卷 321-326页

作者： WEN QIXIAO, CHENG LILI and CHEN BIYUN institute of soil science, the{3., nanjing 210008 (china) 中科院南京土壤所江苏南京 210008

X-ray photoelectron spectroscopy (XPS) was applied to examine the N structures of soil humic substances and some of their analogues. It was found that for soil humic substances XPS method gave similar results as those obtained by 15N CPMAS NMR (cross-polarization magic-angle spinning nuclear magnetic resonance) method. 70%～86% of total N in soil humic substances was in the form of amide, and 6%～13. was presented as amines, with the remaining part as heterocyclic N. There was no difference in the distribution of the forms of N between the humic substances from soils formed over hundreds or thousands of years and the newly formed ones. For fulvic acid from weathered coal and benzoqu inone- (N H-4 )-2 S O-4 polymer the XPS results deviated significantly from the 15N CPMAS NMR data.

关键词： distribution of N forms 15N CPMAS NMR soil humic substances XPS.