检索结果-南通市图书馆

Sorption of Heavy Metal and Organic Pollutants on Modified Soils

Pedosphere 2007年第2期17卷 235-245页

作者： MENG Zhao-Fu ZHANG Yi-Ping WANG Guo-Dong College of Life science Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 （China）. College of Natural Resources and the Environment Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 （China）

Sorption characteristics of both an organic pollutant (phenol) and a heavy metal (cadmium ion) on the clay layer of a Lou soil (Eum-orthic Anthrosol in Chinese Soil Taxonomy) along with the sorption mechanism were investigated using three soil treatments: modification with a cationic surfactant cetyltrimethylammonium bromide added at an amount equivalent to 5.% and 100% of the soil CEC (5.%CB and 100%CB), modification with an amphoteric surface-modifying agent dodecyldimethylbetaine (commercially known as BS-12) added at an amount equivalent to 5.% and 100% of the soil CEC (5.% BS and 100%BS), and an unmodified control (CK). Results showed that the BS soil treatments increased sorption of both the heavy metal Cd2+ and the organic pollutant phenol. The equilibrium sorption amount of Cd2+ decreased in the order: 5.%BS > 100%BS > CK > 5.%CB > 100%CB, with the BS soil treatments being about 1.3 to 1.8 times higher and the CB soil treatments about 23% to 4.% lower than CK. Both the single-site and two-site Langmuir models could be applied to describe the sorption of Cd2+ in each soil treatment. The equilibrium sorption amount of phenol on the soil samples decreased in the order: 100%CB > 5.%CB > 100%BS > 5.%BS > CK, with the CB soil treatments being 4..0 to 79.6 times higher and the BS soil treatments 4.0 to 8.3 times higher than CK. The Freundlich equation could also be used to describe the sorption characteristics of phenol. In the BS soil treatments, both an organophobic long carbon chain and hydrophilic charged groups resulted in a relatively strong sorption ability for both heavy metals and organic pollutants. In addition, the sorption ratio K, the ratio of phenol sorption amount of the modified soil to that of CK, increased initially and decreased later with the amount of phenol added, and the critical sorption ratio KC, the peak value of the sorption ratio curve plotted against the added phenol concentration, was a good index for evaluating the sorption ability of

关键词： amphoteric surface modifying agent cadmium ion phenol sorption characteristics sorption ratio K

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrogen peroxide-induced changes in intracellular pH of guard cells precede stomatal closure

引用

Cell Research 2001年第1期11卷 37-43页

作者： ZHANG XIAO, FA CAI DONG, JUN FENG GAO, CHUN PENG SONG (Department of Biology, Henan university, Kaifeng 4.5.01, China) (College of Life sciences, northwest sci-tech university of agriculture and {4., yangling 712.00, China) 2College of Life sciences Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China 1Department of Biology Henan University Kaifeng 475001 China 2College of Life sciences Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China 1Department of Biology Henan University Kaifeng 475001 China

Epidermal bioassay demonstrated that benzylamine, a membrane-permeable weak base, can mimick hydrogen peroxide (H2O2) to induce stomatal closure, and butyric acid, a membrane-permeable weak acid, can partly abolish the H2O2-induced stomatal closure. Confocal pH mapping with the probe 5.(and-6)- carboxy seminaphthorhodafluor- 1 - acetoxymethylester (SNARF-1-AM) revealed that H2O2 leads to rapid changes in cytoplasmic and vacuolar pH in guard cells of Viola faba L, i. e. alkalinization of cytoplasmic areas occur red in parallel with a decrease of the vacuolar pH, and that butyric acid pretreatment can abolish alkalinization of cytoplasmic areas and acidification of vacuolar areas of guard cells challenged with H2O2. These results imply that the alkalinization of cytoplasm via efflux of cytosol protons into the vacuole in guard cells challenged with H2O2 is important at an early stage in the signal cascade leading to stomatal closure.

关键词： H2O2 pH SNARF-1-AM confocal Vicia guard cell.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Soil Microbial Biomass Nitrogen and Its Relationship to Uptake of Nitrogen by Plants

引用

Pedosphere 2002年第3期12卷 251-256页

作者： ZHOUJIANBIN LISHENGXIU 等 CollegeofResourcesandEnvironmentalsciences NorthwestSci－TechUniversityofAgricultureandForestryYanglingShaanxi712100（China） CollegeofResourcesandEnvironmentalsciences NorthwestSci－TechUniversityofAgr

The contents of the soil microbial biomass nitrogen (SMBN) in the soils sampled from the Loess Plateau of China were determined using chloroform fumigation aerobic incubation method (CFAIM), chloroform fumigation anaerobic incubation method (CFANIM) and chloroform fumigation-extraction method (CFEM).The N taken up by ryegrass on the soils was determined after a glasshouse pot experiment. The flushes of nitrogen (FN) of the soils obtained by the CFAIM and CFANIM were higher than that by the CFEM, and there were significantly positive correlations between the FN obtained by the 3 methods. The N extracted from the fumigated soils by the CFAIM, CFANIM and CFEM were significantly positively correlated with the N uptake by ryegrass. The FN obtained by the 3 methods was also closely positively correlated with the plant N uptake. The contributions of the SMBN and mineral N and mineralized N during the incubation period to plant N uptake were evaluated with the multiple regression method. The results showed that the N contained in the soil microbial biomass might play a noticeable role in the N supply of the soils to the plant.

关键词： mineral N N uptake soil microbial biomass N

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Resistance of Chinese Wild Vitis to Uncinula necator and its Inheritance in F_1 Generation

引用

Agricultural sciences in China 2002年第2期1卷 195-199页

作者： ZHANG Jian-xia, WANG Yue-jin and XU Yan(College of Horticulture , northwest sci-tech university of {4. and {5., yangling 712.00) College of Horticulture Northwest Sci-tech University of Agriculture and Forestry Yangling 712100

By natural field identification, the resistance of Chinese wild Vitis to Uncinula necator and its inheritance in F1 generation were studied with 35.clones of 9 Chinese wild Vitis species, 171 F1 individuals of 4.inter-species cross between Chinese wild Vitis and Vitis vinifera cultivars, and 16 individuals of self-pollinated Chinese wild Vitis. Results showed that the phenotypes of resistance to Uncinula necator in Chinese wild Vitis and its F1 generation were rich and diverse. Based on the segregation of resisitance to Uncinula necator in the progenies resulted from both interspecific hybridization and self-pollination, of Chinese native wild Vitis species and clones were controlled by poly genes showing dominant independent heredity. Minor resistant genes were also exist in Chinese wild susceptible Vitis species and clones.

关键词： Chinse wild Vitis F1 generation Uncinula necator Disease-resistance Inheritance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Anatomy of Vitis Berries During Their Coloring

引用

Agricultural sciences in China 2002年第4期1卷 400-403页

作者： WAN Yi-zhen and HE Pu-chao(College of Horticulture, northwest sci-tech university of {4. and {5., yangling 712.00 , P.R. China) College of Horticulture Northwest Sci- Tech University of Agriculture and Forestry Yangling 712100 P.R. China

During 1998 - 1999, the course of the berry coloring and the development of the pigment cells from veraison to ripeness were studied by freeze sectioning 4. accessions of 12 Vitis species (including 10 Chinese wild species). External observation showed that the berries of most species began coloring on the fruit top surface or on the sun-lit surface, and the berry surface color was evenly distributed when the berry was ripe. Internal observation revealed that the pigment cells in a few layers between cuticle and sub-cuticle colored first, the cuticle colored from inner layers to outer layers while the sub-cuticle from outer to inner, and the cuticle cells began coloring a little earlier than the sub-cuticle ones in most species. The pigment cells developed unevenly during the berry ripening. In the beginning of berry coloring, the cell pigment density among the layers or among the cells in the same layer was different. Both the numbers of the pigmented cells and the cell pigment density increased during the berry coloring, while the former lasted a short time; however, the latter kept increasing from veraison to ripeness, and they reached the deepest color when the berry was ripe.

关键词： Vitis Berry Coloring Pigment cell Anatomy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STUDY OF SETTING UP THE FOREST RESOURCES MANAGEMENT INFORMATION SYSTEM BASED ON WEBGIS

引用

Chinese Geographical science 2003年第1期13卷 56-61页

作者： WU Su-li, LOU Quan-sheng, QUAN Zhi-jie, LI Xiao-jun (northwest sci-tech university of {4. and {5., Xi’an {4., P. R. China) northwest sci-tech university of {4. and {5. Xi’an P. R. China

Based on an analysis of the characteristics of the Forest Resources Management Information System of each development phase, and consideration of the technical trend in Geographic Information System (GIS) in the Internet Age, this paper explores the importance and the feasibility of setting up Forest Resources Management Information System based on the WEBGIS. At the same time, based on the experience of our study, the paper explores the function, structure and method of developing the Forest Resources Management Information System based on WEBGIS. With the technology of WEBGIS, the Forest Resources Management Information System with data from Huoditang Farm was set up, which makes a great impact on forest resources management. So setting up the Forest Resources Management Information System based on WEBGIS is a trend of forest resources management. In the course of setting up this system, we must pay attention to following questions: 1) unify data standard and information encoding; 2) change mind.

关键词： WEBGIS forest resources management information system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon isotope ratios of C_(4. plants in loess areas of North China

引用

science China Earth sciences 2006年第1期49卷 97-102页

作者： WANG Guoan1,2,3, HAN Jiamao 2, ZHOU Liping3, XIONG Xiaogang4. TAN Ming2, WU Zhenhai5.& PENG Jun6 1. Department of Plant Nutrition, China Agricultural university, Beijing 100094. China 2. Institute of Geology and Geophysics, Chinese Academy of sciences, Beijing 100029, China 3. College of Environmental sciences, MOE Laboratory for Earth Surface Processes, Peking university, Beijing 100871, China 4. Institute of Botany, Chinese Academy of sciences, Beijing 100093, China {5., yangling 712.00, China 6. Network Center, China Agricultural university, Beijing 100094. China 1. Department of Plant Nutrition China Agricultural University Beijing 100094 China 2. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 3. College of Environmental sciences MOE Laboratory for Earth Surface Processes Peking University Beijing 100871 China 4. Institute of Botany Chinese Academy of Sciences Beijing 100093 China 5. northwest sci-tech university of agriculture and forestry Yangling 712100 China 6. Network Center China Agricultural University Beijing 100094 China

Carbon isotope ratios (δ^(13)C) of 89 C_4.plant samples were determined fromthe loess area in North China. δ^(13)C values vary between -10.5.er thousand and -14.6per thousandwith a mean of -12.6per thousand. Along a precipitation gradient from the semi-moist area to thesemiarid area, then to the arid area, the δ^(13)C values of C_4.plants show a slight decreasingtrend. The δ^(13)C values of C_4.plants in the dry season are found lower than those in the wetseason. These trends are opposite to those observed for C_3 species.

关键词： C4 plants, carbon isotope ratios, loess area.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Developmental Tendency of Dry Land Farming technologies

引用

Agricultural sciences in China 2002年第8期1卷 934-944页

作者： SHAN Lun(Institute of Soil and Water Conservation, Chinese Academy of sciences and Ministry of Water Resources, northwest sci-tech {4. of {5. and forestry, yangling 712.00, P. R . China ) Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Northwest Sci- Tech University of Agriculture and Forestry Yangling 712100 P. R. China

The developmental tendency of dry land farming technologies in the semiarid area of China were reviewed based on the overview of recent progress in dry land farming researches from China and oversea. It was emphasized that conservation tillage, limited irrigation, genetic modification and chemical control are the important aspects for the dry land farming research and development of the future. In addition, some consid-

关键词： Dry land farming Conservation tillage Limited irrigation Genetic modification Chemical control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low temperature wheat germplasm and its leaf photosynthetic traits and structure characteristics

引用

Progress in Natural science:Materials International 2004年第6期 21-26页

作者： ZHANG Songwu *, MIAO Fang and WANG Changfa(northwest sci-tech university of {4. and {5.,yangling 712.00, China) northwest sci-tech university of {4. and {5. Yangling 712100 China

Low temperature germplasm with constant low plant temperature was found in the nature through a long-time observation on wheat canopy temperature and traits;correspondingly,high temperature germplasm with constant high plant temperature also exists. Compared with the high temperature germplasm,the chlorophyll content and the net photosynthetic rate of the three functional leaves on the top of the low temperature wheat germplasm are higher and the structure tends to be more complicated,which is characterized by smaller mesophyll cells and more closely arranged cell layers,more and denser chloroplasts with thick stroma, more granas and well developed grana lamellae,a larger vascular bundle area with smaller interspace. All these characteristics embody the consistency of structure and function and provide the theoretical bases for looking for and cultivating the new low temperature materials in agricultural practice.

关键词： low temperature wheat germplasm leaf photosynthetic trait structure.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cytomorphology and Cytochemical Localization of K-type and T-type Cytoplasmic Male Sterile Pollens in Wheat

引用

Agricultural sciences in China 2003年第6期2卷 591-596,T001-T003页

作者： YAO Ya-qin, ZHANG Gai-sheng, LIU Hong-wei and WANG Jun-wei(northwest sci-tech university of {4. and {5. , yangling 712.00 , P. R. China) northwest sci-tech university of {4. and {5. Yangling 712100 P.R. China

By using the technology of microscopy, electron microscopy and enzyme cytochemical localization , comparison was made of the cytomorphology, ATPase and cytochrome oxidase activity in pollens during microspore formation and pollen development, for K-type cytoplasmic male sterile(CMS)lines,T-type CMS lines and their maintainer lines on wheat. The results indicated that pollen abortion of the T-type CMS lines mainly occurred at the later mononucleate pollen stage, and cytomorphological changes of the abortive pollen began with a vacuolar membrane, and pollen aborting was related to a lack of ATPase activity in the nucleus and nucleolus during the mononucleate pollen stage. Pollen abortion of the K-type CMS lines took place mainly during the later binucleate and trinucleate stages, and cytomorphological changes of the abortion first began with mitochondria. The abortion was related to intine disruption.

关键词： Wheat pollen CMS Cytomorphology Cytochemistry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：