检索结果-南通市图书馆

Physical mechanisms of plant roots affecting weathering and leaching of loess soil

Science china Earth sciences 2006年第9期49卷 1002-1008页

作者： LI Yong1,2. ZHANG Qingwen1,2. WAN Guojiang3, HUANG Ronggui3, PIAO Hechun3, BAI Lingyu2.& LI Lu2.1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, institute of Soil and Water Conservation, chinese {2. of sciences, Yangling 712.00, china 2. institute of agro-environment and sustainable development, chinese academy of agricultural sciences, beijing 100081, china 3. institute of Geochemistry, chinese {2. of sciences, Guiyang 550002. china State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences Yangling China institute of agro-{2. and sustainable development Chinese Academy of Agricultural Sciences Beijing China institute of Geochemistry Chinese Academy of Sciences Guiyang China

Plant roots have potential impacts on soil mineral weathering and *** objective is to understand the physical mechanisms of plant roots affecting weathering andleaching of loess soil. Root densities were measured through the method of a large-size dug profile,and transport fluxes of soil elements were determined using an undisturbed monolith soilinfiltration device on the hilly and gully regions of the chinese Loess Plateau. The results showthat the improvement effects of soil environment by plant roots are mainly controlled by the densityand weight of the fibrous roots with the diameters less than 1 mm. Plant roots have the strongereffects on soil physical properties than chemical properties. The principal components analysis(PCA) indicates that soil physical properties by plant roots account for 56.7% of variations in soilenvironment whereas soil chemical properties and pH contribute about 2..2. of the soil *** roles of plant roots in controlling soil weathering and leaching increased in the followingorder: infiltration enhancement > increase of bio-active substance > stabilization of soilstructure. The effects of plant roots on soil mineral weathering and leaching can be quantifiedusing the multiple regression models with the high prediction accuracies developed in this study.

关键词： plant roots, soil weathering and leaching rates, soil environment field, principal components analysis (PCA), chinese Loess Plateau.

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

Palynological characters of Glycyrrhiza,Glycyrrhizopsis,and Meristotropis(Leguminosae),with special reference to their taxonomic significance

引用

Journal of Systematics and Evolution 2010年第6期48卷 455-463页

作者： 1,2.ei MENG 2.iang-Yun ZHU 1(College of Biological sciences,china {2. University,beijing 100094,china) 2.institute of Botany,chinese academy of sciences,beijing 100093,china) (College of Biological sciences China Agricultural University Beijing 100094 China) (institute of Botany Chinese Academy of Sciences Beijing 100093 China)

The pollen morphology of 11 species of the genus Glycyrrhiza *** one from each of the genera Glycyrrhizopsis Boiss.& *** Meristotropis Fisch.& *** investigated by scanning electron *** pollen morphology,the main differences between Glycyrrhizopsis and Glycyrrhiza are:Glycyrrhizopsis-pollen grains 36.63 × 40.42.μm in size,oblate spheroidal in shape;and Glycyrrhiza-pollen grains 2..47-33.18 × 2..82.31.83 μm in size,prolate spheroidal in *** and Glycyrrhiza should be recognized as two distinct genera based on palynological and morphological *** and Glycyrrhiza are similar in many important palynological and morphological characters,suggesting that the two should be *** Glycyrrhiza,two types of pollen grains,3-lobed-circular or subtriangular in polar view,are found in different species,in accordance with morphological differences in the two groups,shedding light on the classification and evolution of the genus.

关键词： exine sculpture morphological character pollen morphology taxonomic revision.

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

Value of ecosystem services in china

引用

chinese Science Bulletin 2000年第10期45卷 870-876页

作者： CHEN Zhongxin & ZHANG XinshiLaboratory of Quantitative Vegetation Ecology, institute of Botany, chinese {2. of sciences, beijing 100093, china Current address: institute of Natural Resources and Regional Planning, chinese academy of agricultural sciences, beijing 100081, china Laboratory of Quantitative Vegetation Ecology Institute of Botany Chinese Academy of Sciences Beijing China

The function and services are the important components of the life-support system in theplanet, as well as the basic elements for sustainable development of {2. and society. It is a must to evaluate it for incorporating it with the social-economic system. It is also an important approach to draw the public attention on the {2.al and ecosystem conservation. In this study, the ecosystem function and services in china were estimated by employing the classification and economic parameters from Costanza et al. The type and area of terrestrial ecosystems were extracted from Vegetation Map of china (1:4 000 000), and then the distribution map of ecosystem services of china was drawn. According to our calculation, the total value of ecosystem services in china is 77 834.48×108 RMB yuan per annum. The value for terrestrial ecosystem is 56 098.46×108 yuan per annum, and that for marine ecosystem is 2. 736.02.108 yuan per annum. The value of ecosystem services in china is 1.73 times bigger

关键词： ecosystem function service.

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

Effect of 5'-deletion of Arabi-dopsis profilin2.promoter on its vascular specific expression

引用

chinese Science Bulletin 2001年第19期46卷 1627-1630页

作者： LIU Yuhui, WANG Zhixing & JIA ShirongBiotechnology Research institute, chinese academy of agricultural sciences,{2., china Biotechnology Research institute Chinese Academy of Agricultural Sciences Beijing China

Based on the published sequence of profilin2.promoter of Arabidopsis thaliana, a full-length promoter (1667 bp) was amplified by PCR. The 5’ -end deletion fragments with length of 1380, 1153, 969 and 597 bp were then fused with gus (uid\) gene respectively. Constructed plant expression vectors were individually transferred into Kalan-choe laciniata and transgenic plants regenerated. GUS his-tochemical assay confirmed that the full-length promoter Pfnl.7 was vascular-specific. Deletion assays showed that profilin2.promoter could be divided into three parts. Deletion of fragment 1 ( -1667 -1380 bp) resulted in constitutive expression, suggesting that element(s) responsible for vascular-specific expression might exist in this region. Fragment 2.located at -1153 - -597 bp strongly inhibited gus gene expression. Fragment 3 ( -597 - -1 bp) is considered as a basic domain of profilin2.

关键词： profilin2 promoter Kalanchoe constitutive expression vascular-specific expression.

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

Pattern phenomena in an rf discharge dusty plasma system

引用

Science china(Physics,Mechanics & Astronomy) 2006年第5期49卷 588-596页

作者： HUANG Feng1,2. YE Maofu2.& WANG Long2.1. College of Science, china agricultural University, {2. 100083, china 2. institute of Physics, chinese academy of sciences, {2. 100080, china College of Science China Agricultural University Beijing China institute of Physics Chinese Academy of Sciences Beijing China

Various dust patterns are observed in an rf discharge dusty plasma system. According to the dust growth process from small to large in size, the formation of different dust patterns can be divided into two stages: the small-particle stage (or dust cloud stage), and the large-particle stage (or dust crystal stage). The evolution relations between different dust patterns with gas pressure changing are investigated. Dust voids, dust acoustic waves and strong turbulence modes are presented at the small-particle stage. The self-organized dust lattices and dust clusters are investigated at the large-particle stage. The static structure of a dust lattice is characterized by means of the pair correlation function. Dust clusters formed by particles with different numbers and the regular evolution of the clusters with gas pressure are also investigated. The packing sequences of dust clusters are verified through two-dimensional confined molecular dynamics simulations.

关键词： dusty plasma dust patterns

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

Technological system for sustainable development of {2. agriculture

引用

Journal of environmental sciences 1994年第4期6卷 471-477页

作者： Zhang Renwu Ji Wenying Zhang Tong (agro-environmental Protection {2. , Tianjin 300191, china) Sun Hongliang ({2. of Crop Breeding and Cultivation, chinese academy of agricultural sciences, beijing 100081, china)

Along with the rapid development of economy, chinese agriculture with a long history is facingthe challenge from {2.. So, the technological system for sustainable development of agriculturewith chinese characteristics, which are based on the eco-economic principle, should be establisbed throughusing the approach of system engineering, carrying on the cream of chinese traditional agricultural tech-niques and adopting modern agricultural techniques. The sustainable development should be realized on thebasis of sound cycles of economy and ecology and coordinated development between {2.al protectionand economic growth or exploitation and regeneration of natural resources.

关键词： sustainable development technological system ecoeconomy sound circulation.

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

Survival of Human Metallothionein-2.Transplastomic Chlamydomonas reinhardtii to Ultraviolet B Exposure

引用

Acta Biochimica et Biophysica Sinica 2006年第3期38卷 187-193页

作者： Yu-Kun ZHANG~1 Gui-Fang SHEN~2.Bing-Gen RU~1*1 National Laboratory of Protein Engineering and Plant Genetic Engineering,Peking University,beijing 100871,china 2.Biotechnology Research {2.,the chinese academy of agricultural sciences,beijing 100081,china National Laboratory of Protein Engineering and Plant Genetic Engineering Peking UniversityBeijing 100871 China Biotechnology Research institute the Chinese Academy of Agricultural SciencesBeijing 100081 China

Solar ultraviolet (UV) radiation has a great influence on green organisms,especially planktonlike Chlamydomonas.A human metallothionein-2.gene,which is generally considered to have an anti-radiationfunction by its coding product,was transferred into the chloroplast genome of Chlamydomonas *** dynamically measure the UV effects on Chlamydomonas cells grown in liquid tris-acetate-phosphatemedium,a new method was developed based on the relationship between the chlorophyll content of an algalculture and its absorbance at 570 nm after the 3-(4,5-dimethylthiazol-2.yl)-2.5-diphenyltetrazolium *** this experiment,both the wild-type and the transplastomic *** ceils were cultivated in 96-well microplates containing liquid tris-acetate-phosphate medium in the absence or presence of zinc,copper,cadmium and *** transgenic *** showed a higher resistance than wild-type to UV-Bexposure under all the examined *** in the medium had positive impacts on both types of cells,but had significant influence only on the transplastomic ***,the high cell viability of the trans-genie alga at the end of the 8 h UV-B treatment disappeared after a 2.-h recovery *** did notprotect cells from UV-B damage,but clearly enhanced the growth of both wild-type and transgenic ***.

关键词： ultraviolet B MTT transplastomic Chlamydomonas metallothionein

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

Homoeologous cloning of ω-secalin gene family in a wheat 1BL/1RS translocation

引用

Cell Research 2005年第8期15卷 658-664页

作者： Jian Fang CHAI1,2. Xu LIU1, Ji Zeng JIA1,* 1Key Laboratory of Crop Germplasm & Biotechnology, Ministry of Agriculture / institute of Crop sciences,{2., beijing 100081, china 2.0} of Genetics and Physiology, Hebei academy of agricultural and Forestry sciences, Shijiazhuang 050051, china Key Laboratory of Crop Germplasm & Biotechnology Ministry of Agriculture / Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing China institute of Genetics and Physiology Hebei Academy of Agricultural and Forestry Sciences Shijiazhuang China

Wheat 1BL/1RS translocations are widely planted in china as well as in most of the wheat producing area in the world for their good qualities of disease resistance and high yield. 1BL/1RS translocations are however poor in bread making, partially caused by a family of small monomeric proteins, ω-secalins, which are encoded by genes on 1RS. Based on published sequence of a rye ω-secalin gene we designed a pair of primers to cover the whole mature protein coding sequence. A major band could be amplified from 1BL/1RS translocations but not from euploid wheat. Using this primer set we conducted PCR amplification by using high fidelity Pfu polymerase on the genomic DNAs and cDNAs purified from a 1BL/1RS translocation Lankao 906. Sequencing analysis indicated that this gene family contains several mem- bers of 1150 bp, 1076 bp, 1075 bp, 1052.bp and 1004 bp genes, including two pseudogenes and three active genes. The gene transcripts were differentially expressed in developing seeds.

关键词： wheat 1BL/1RS translocation ω-secalin quality homoeologous cloning.

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

The Assessment and Utilization of Straw Resources in china

引用

agricultural sciences in{2. 2010年第12期9卷 1807-1815页

作者： WANG Ya-jing, BI Yu-yun and GAO Chun-yu institute of agricultural Resources and Regional Planning,{2., beijing 100081, P.R.china institute of agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

The study was undertaken to evaluate the collectable and usable volume of existing straw resources, its suitability for different ways of utilization and fully reorganization of its development potential in china. Based on the results on the stubble heights of major crops in the Huang-Huai-Hai area （the area along the Yellow River, Huai River, and Hai River）, the evaluation of the collectable and usable coefficients, and the collectable and usable volumes of various straw resources in china were worked out during 2.05. The respective collectable and usable volumes of straw resources were worked out on the basis of suitability as fuel, feed, fertilizer, and base material for edible mushrooms. The total collectable and utilizable quantity of straw in china was 685 950 000 t, and the mean collection coefficient was 0.81 during 2.05. The quantity of straw residue and wasted straw accounted for 19%. The collectable and utilizable quantities of grain, cash crop, and other crop straw were 492.310 000, 162.610 000, and 31 030 000 t which accounted for 71.77, 2..71, and 4.52., respectively of the total collectable and utilizable quantity of straw. The quantity of straw which could be used as fuel was 635 000 000 t, which accounted for 92.63% of total quantity of the straw in the country during 2.05. Among the total quantity of collectable and utilizable straw in china during 2.05, the quantities of straw suitable and unsuitable for being processed as feedstuff were 587 640 000 and 98 310 000 t, which accounted for 85.67 and 14.33%, respectively. The quantity of straw residue returned to the field and collectable and utilizable straw for direct field restoration was 616 000 000 t, which accounted for about three-fourths of the total straw yield, while the quantity of straw for cultivation of edible mushrooms and industrial processing was about 587 000 000 t, which accounted for more than 85% of the total collectable and utilizable straw. The evaluation results indicate that t

关键词： china straw resources collectable and utilizable quantity suitability assessment

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

Transformation of GbSGT1 gene into banana by an agrobacterium-mediated approach

引用

Progress in Natural Science:Materials International 2007年第10期17卷 1241-1243页

作者： Li Shengjun1, Wen Ruiming2. Pei Xinwu1, Chen Shikai2. Li Weimin and Jia Shirong1(1. Biotechnology institute, chinese academy of agricultural sciences,{2., china 2. Xinyi institute of agricultural Science and Technology, Xinyi 52.530, china) Biotechnology institute Chinese Academy of Agricultural Sciences Beijing 100081 China Xinyi institute of agricultural Science and Technology Xinyi 523530 China

SGT1 is a homologue of the yeast ubiquitin ligase-associated protein. It controls some protein degradation and activates defense pathway in plants. Cotton GbSGT1 gene (Gossypium barbadense) has been isolated and characterized in previous work. In this study, the plant expression vector pBSGT1 with bar gene as a selection agent was constructed and transgenic banana was obtained via agrobacterium-mediated transformation with the assistance of particle bombardment and screened with PCR and Basta spreading on banana plant leaves. Estimating of transgenic banana plants for resistance to Panama wilt is in progress.

关键词： transgenic banana agrobacterium-mediated GbSGT1.

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

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：