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Search Results: 1 - 10 of 80850 matches for " Liu Dengyi "
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A PRELIMINARY EXPLORATION OF THE FLORA OF THE LIUGUJIAN MOUNTAINOUS REGIONS ON THE BOUNDARY BETWEEN ANHUI AND JIANGXI
皖赣边境六股尖山区植物区系初探

Liu Dengyi,
刘登义

植物科学学报 , 1988,
Abstract: 六股尖山区植物种属丰富,共有维管束植物932种,隶属529属,150科。其植物区系主要起源于古北大陆,具典型中亚热带性质。提出在华东植物区系分区上,应将六股尖划归庐山区;在植被分区上,应将皖南中亚热带的北界南移至北纬30°线附近。
Study of the tolerance ofHippochaete ramosissimum to Cu stress
Dengyi Liu,Ying Li,Ling Chu,Guanglin Wang,Lilong Wang
Science China Life Sciences , 2005, DOI: 10.1007/BF02889813
Abstract: We investigated the tolerance ofHippochaete ramosissimum and the changes in physiological metabolism following exposure to copper using pot experiments and analyzing plant physiology and biochemistry. The results showed that Cu tolerance inHippochaete ramosissimum varied significantly between different populations; the tolerance of plants living in Cu polluted areas for extended periods of time exceeded that of plants living in unpolluted areas. SOD and POD activities in highly Cu tolerant plants increased noticeably following exposure to Cu. This indicates that maintaining and increasing the two kinds of protective enzyme activities are the primary foundations of plant tolerance. However, no change in CAT activity was demonstrated following Cu exposure. In summary, there existed considerable differences in physiological metabolism between different populations ofHippochaete ramosissimum following exposure to Cu.
Nitrite content of common vegetables in Wuhu City
芜湖市几种常见蔬菜中亚硝酸盐含量分析

WANG Youbao,HUANG Wei,LIU Dengyi,
王友保

应用生态学报 , 2005,
Abstract: Laboratory analysis was carried out to study the nitrite content and its affecting factors of 10 common vegetables in terminal markets of Wuhu City. The results showed that the nitrite content of root or stem- and fruit vegetables was lower than the national standard, but that of leaf vegetables exceeded the standard seriously. The nitrite in vegetables increased significantly with storage time. Stored under room temperature, the test vegetables had 1-2 times higher nitrite content at the fourth day than at the first day, but storage under low temperature, i. e., in refrigerator, could hinder the increase of nitrite content in vegetables, and the daily increase was only 1/2-1/6 times of that under room temperature. Abluent could eliminate nitrite effectively, whose efficiency was 1-5 times higher than that of tap water.
Physiological metabolism and protective enzyme activity of Equisetum ramosissimum under Cu stress
铜对节节草生理代谢及抗氧化酶活性的影响

LI Ying,LIU Dengyi,
李影
,刘登义

应用生态学报 , 2006,
Abstract: The study with pot culture experiment showed that Equisetum ramosissirmunm did not appear obvious poisoning symptoms when treated with low concentration Cu (500 mg x kg(-1)), while serious injuries were found when treated with high concentration Cu (1000 to approximately 3000 mg x kg(-1)), which reflected in the severe damage of cell membrane and cytoarchitecture as well as the structure and function of main organelles, and the significant decrease of the contents of leaf chlorophyll a and b and stem soluble monosaccharose. The cell membrane osmolarity and the average MDA content of the plant exposed to heavy copper pollution was 1 to approximately 2 and 1 to approximately 3 times greater than the control, respectively. It could be concluded that high concentration Cu disturbed the physiological metabolism, and critically threatened the normal growth of E. ramosissimum. The activities of protective enzyme, especially of SOD and POD, were enhanced with increasing Cu concentration, and had a positive correlation with Cu concentration (rPOD = 0.978, rSOD = 0.926, P < 0.05).
Foliar δ13C and δ15N values of C3 plants in the Ethiopia Rift Valley and their environmental controls
LIU XiaoHong,ZHAO LiangJu,GASAW Menassie,GAO DengYi,QIN DaHe,REN JiaWen,
LIU
,XiaoHong,ZHAO,LiangJu,GASAW,Menassie,GAO,DengYi,QIN,DaHe,REN,JiaWen

科学通报(英文版) , 2007,
Abstract: The foliar C and N stable isotopic compositions (δ 13C and δ 15N) and the relationships between these compositions and environmental factors of C3 plants in the Ethiopia Rift Valley were investigated. There were three distribution patterns for foliar δ 13C with mean values of 26.7‰±0.4‰, 29.7‰ ± 0.6‰, and 26.9‰ ± 1.2‰ in cold-moist, temperate-moist, and arid-hot environments, respectively. The δ 15N values ranged from 1.4‰ ± 1.7‰ to 14.3‰ ± 0.1‰, with higher values under arid-hot conditions and the lowest values in plants growing at higher altitudes under cold-moist conditions. A strong negative relationship between mean annual precipitation and δ 15N explained more than half of the observed variation in the δ 15N values (r 2 = 0.54, P < 0.001); a modest positive relationship was also found between δ 15N and temperature (r 2 = 0.32, P < 0.01). A weakly positive relationship existed between δ 13C and temperature, and changes in δ 13C values with precipitation and altitude followed quadratic curves. This suggests a shift in the effects of water and heat conditions caused by altitude on carbon isotopic discrimination. Supported by the Import-Talents Program of the Cold and Arid Regions Environmental and Engineering Research Institute (Grant No. 2005104), the National Natural Science Foundation of China (Grant No. 40501076), the Chinese Science Expedition (DEEP) of the China Association for Scientific Expedition, and International Partnership Project of Chinese Academy Sciences (Grant No. CXTD-Z2005-2)
Foliar δ 13C and δ 15N values of C3 plants in the Ethiopia Rift Valley and their environmental controls
XiaoHong Liu,LiangJu Zhao,Menassie Gasaw,DengYi Gao,DaHe Qin,JiaWen Ren
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0165-5
Abstract: The foliar C and N stable isotopic compositions (δ 13C and δ 15N) and the relationships between these compositions and environmental factors of C3 plants in the Ethiopia Rift Valley were investigated. There were three distribution patterns for foliar δ 13C with mean values of 26.7‰±0.4‰, 29.7‰ ± 0.6‰, and 26.9‰ ± 1.2‰ in cold-moist, temperate-moist, and arid-hot environments, respectively. The δ 15N values ranged from 1.4‰ ± 1.7‰ to 14.3‰ ± 0.1‰, with higher values under arid-hot conditions and the lowest values in plants growing at higher altitudes under cold-moist conditions. A strong negative relationship between mean annual precipitation and δ 15N explained more than half of the observed variation in the δ 15N values (r 2 = 0.54, P < 0.001); a modest positive relationship was also found between δ 15N and temperature (r 2 = 0.32, P < 0.01). A weakly positive relationship existed between δ 13C and temperature, and changes in δ 13C values with precipitation and altitude followed quadratic curves. This suggests a shift in the effects of water and heat conditions caused by altitude on carbon isotopic discrimination.
Investigation on the vegetation of copper tailing wasteland in Shizishan, Tongling, Anhui Province
安徽铜陵狮子山铜尾矿场植被调查

LI Ying,WANG Youbao,LIU Dengyi,
李影
,王友保,刘登义

应用生态学报 , 2003,
Abstract: Investigation on the vegetations of the copper tailing wasteland was conducted in Shizishan, Tongling, Anhui Province. Total 49 species of natural colonized plant, belonging to 15 families and 38 genera, were found, among which, 26 species were annual plant, and 20 species perennial. Most of species were belonging to Compositae (12 species), Gramineae (11 species), and Leguminesae (8 species). 5 relatively stable communities were found. The main limiting factors of vegetation distribution were extreme infertility of the wasteland, high concentration of heavy metals (especially, the concentration of Cu and Cd in the wasteland were 30 times as those in the normal soil), and degree of natural recolonization.
Responses of Conyza canadensis to different concentrations of copper in soil
土壤不同浓度铜对小飞蓬毒害及耐受性研究

DING Jiahong,LIU Dengyi,LI Zheng,WANG Guanglin,
丁佳红

应用生态学报 , 2005,
Abstract: Through pot experiment and physiological-biochemical analysis, the study showed that the electric conductivities of Conyza canadensis collected from heavy Cu pollution (I), light Cu pollution (II) and control (III) sites were enhanced, while the chlorophyll (a + b) contents were reduced with increasing Cu concentration. The protein and proline contents in I were increased at first and then reduced, but those in II and III were reduced with increasing Cu concentration. The activities of SOD, POD and CAT were intensified under Cu stresses. When the Cu concentration was 1 200 mg x kg(-1), their activities in I, II and III were increased 194.1%, 206.2% and 118.6%, 170.1%, 182.9% and 111.3%, and 115.1%, 155.4% and 107.3%, respectively, in comparing with the control, which illustrated that the tolerance of Conyza canadensis was in order of heavy Cu pollution site > light Cu pollution site > control site, and the three ecotypes showed distinct differences in tolerance.
Heavy metals pollution of Paeonia ostii land at copper-tailings reservoir of Tongling city:A preliminary study
铜陵铜尾矿凤丹种植基地重金属污染初探

SHEN Zhangjun,WANG Youbao,WANG Guanglin,YAN Mi,LI Zheng,LIU Dengyi,
沈章军

应用生态学报 , 2005,
Abstract: The study on the soil and Paeonia ostii Cu, Cd, Pb and Zn at the copper-tailings reservoir of Tongling City, Anhui Province showed that the forms and contents of test heavy metals were differed in Paeonia ostii-planted and control soils. The Cu and Cd contents in control soil were 4.36-14.43 and 3.67-3.86 times of the 2nd national standard for soil environmental quality, respectively, and the composite pollution index of the heavy metals in Paeonia ostii-planted soil was up to 5.607. The heavy metals content in Paeonia ostii leaf and root-stem was in order of Cu>Zn>Pb>Cd, and that in Paeonia ostii stem and root- peel was Zn>Cu>Pb>Cd. The comparison of the heavy metals contents in Paeonia ostii with the criterion about herbal medicine showed that the Cu content in Paeonia ostii was 1.43-2.53 times of the criterion, and the Cd content was 1.17-3.17 times of the criterion.
Genetic diversity of rare and endangered plant Magnolia amoena
珍稀濒危植物天目木兰(Magnolia amoena)遗传多样性的RAPD分析

LIU Dengyi,CHU Ling,YANG Yuehong,
刘登义
,储玲,杨月红

应用生态学报 , 2004,
Abstract: The genetic variations within and between eleven natural populations and one cultured population of Magnolia amoena from different distribution regions were investigated at the DNA level by employing RAPD.Out of 40 random primers ,fourteen random primers were screened which could generate highly reproducible and clear RAPD fragments for further population analysis.With these primers,a total of 94 discernible DNA fragments were obtained and 23(24.4%) were polymorphic,which indicated that low levels of genetic variation existed in the investigated populations.In addition,UPGMA map were made according to the genetic similarity and distance of the twelve populations calculated in this article.The result showed that the genetic diversity between individuals within population was lower than that between populations.The individual genetic differentiation might be relation to their geographic distribution.The low total genetic diversity of Magnolia amoena was one reason for its endangerment.
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