检索结果-南通市图书馆

THE CULTURE HISTORY AND BREEDING STRATEGY OF POPLAR IN ITALY

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast forestry University 1992年第2期3卷 95-100页

作者： Xu Hongyuan research institute of {2. ,Chinese academy of {2. 1. research institute of {2. Chinese Academy of Forestry China

INTRODUCTION In Italy,they have done many bcnefi-cial works in the high yield plantation--the culture and the breeding of ***,in our country,introduced manygood clones such as I—2.4,I—72.and I—*** the clones were t... 详细信息

关键词： THE CULTURE HISTORY AND BREEDING STRATEGY OF POPLAR IN ITALY

Biology and chemistry of Litsea cubeba,a promising industrial tree in china

在线全文

学校读者我要写书评

暂无评论

Biology and chemistry of Litsea cubeba,a promising industria...

Thresholds of geographic environmental elements in sediment yield of drainage basins

第十三届全国植物基因组学大会

作者： Yicun Chen,Yangdong Wang~* institute of subtropical {2.,Chinese academy of {2.,fuyang 311400,china

Litsea cubeba(Lour.) Pers.(Lauraceae) is a promising industrial *** plant is rich in valuable essential oil,which is widely used as an ingredient in ionone flavors, botanical insecticides,food spices and personal-care products,and the plant extract has been used in traditional Chinese ***,the potential for producing biodiesel through transesterification of *** kernel oil holds great

关键词：

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

Science china Earth Sciences 2005年第2期48卷 230-240页

作者： CHEN Hao, ZHOU Jinxing, CAI Qiangguo, LU Zhongchen & LI Zhongyan institute of Geographic Sciences and Natural Resources research, Chinese {2. of Sciences, Beijing 100101, china institute of forestry Science, Chinese {2. of forestry Science, Beijing 100091, china research Center for Eco-Environment Sciences, Chinese {2. of Sciences, Beijing 100085, china Computing institute of Science and Engineering, North china Electric Power University, Beijing 102.06, china 1. institute of Geographic Sciences and Natural Resources research Chinese Academy of Sciences 100101 Beijing China 2. institute of forestry Science Chinese Academy of Forestry Science 100091 Beijing China 3. research Center for Eco-Environment Sciences Chinese Academy of Sciences 100085 Beijing China 4. Computing institute of Science and Engineering North China Electric Power University 102206 Beijing China

Threshold of environmental elements in drainage basin sediment yield refers to, under effect of climate, underlying surface and human activity, a turning point of abrupt changes in drainage sediment yield related to environmental element characteristics. Previous studies on threshold of sediment yield of relevant drainage basins were mainly concentrated on impact of natural zones with a few researches on impact of other environmental elements. Particularly studies on compound environmental element threshold in drainage basin sediment yield remain blank today. Studies indicate that sediment yield in drainage basins is affected by compound interactions and complex actions. Based on single element analysis, the present paper gives quantitatively compound threshold of environmental elements affecting sediment yield of the drainage basin between Hekouzhen and Tongguan in the middle Yellow River by the method of multi-variant, polynomial formula regression analysis.

关键词： middle Yellow River, environmental element, sediment, sediment delivery mudule, threshold.

The Oleic Acid Desaturase(FAD2. Gene from Caragana intermedia:Cloning and Regulation Analysis of Its Expression in Yeast

在线全文

学校读者我要写书评

暂无评论

The Oleic Acid Desaturase(FAD2) Gene from Caragana intermedi...

The impact of vegetation restoration on erosion-induced sediment yield in the middle Yellow River and management prospect

2.09整合植物生物学研讨会

作者： Ping Lin~(1*),Yangdong Wang~1,Shougong Zhang~2.and Liwang Qi~2.1 research institute of {2. forestry,Chinese academy of forestry,fuyang,311400,china 2.research institute of forestry,Chinese academy of forestry,Beijing,100091,china.

Caragana intermedia has a wide distribution and is very important for the environment as it can improve the soil quality and hold water in arid regions of china *** the aim to increase productivity,the oleic acid desaturase(FAD2.gene,which code the key enzyme of polyunsaturated fatty acid synthesis was cloned from young seeds of

关键词：

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

Science china Earth Sciences 2005年第6期48卷 724-741页

作者： CHEN Hao1, ZHOU Jinxing2. CAI Qiangguo1, YUE Zhongqi3, LU Zhongchen4, LIANG Guanglin1& HUANG Jianguo5 1. Key Laboratory of Water Cycle and Related Land Surface Processes, institute of Geographic Sciences and Natural Resources Re-search, Chinese academy of Sciences, Beijing 100101,{2. 2. institute of forestry, Chinese academy of forestry Sciences, Beijing 100091,{2. 3. Department of Civil Engineering, University of Hong Kong, Hong Kong,{2. 4. Eco-environmental research Center, Chinese academy of Sciences, Beijing 100085,{2. 5. College of Resources and Environment, Southwest Agricultural University, Chongqing 400716,{2. Correspondence should be addressed to Chen Hao 1. Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences 100101 Beijing China 2. institute of forestry Chinese Academy of Forestry Sciences 100091 Beijing China 3. Department of Civil Engineering University of Hong Kong Hong Kong China 4. Eco-environmental research Center Chinese Academy of Sciences 100085 Beijing China 5. College of Resources and Environment Southwest Agricultural University 400716 Chongqing China

According to the characteristics of water and erosion environments of different natural zones on the Loess Plateau, this paper studies changes of vegetation types, distribution boundaries of forest and grass as well as restoration capacity of vegetation in different natural zones in the middle Yellow River. The annual precipitation of 530 mm is the critical annual pre-cipitation for forest and grass distribution in the middle Yellow River. Among the zonal and azonal environmental factors affecting watershed sediment yield, the intermediate diameter D50 (mm) of suspended load and forest coverage (V, %) play the leading role. Of them the effect weight of forest coverage (V, %) on catchments sediment yield is only 3.4% less than the role of the intermediate diameter (D50, mm), they are almost the same. To effectively control soil erosion in semiarid, especially in hilly-gullied areas and make sediment transport modulus reduce to less than 6000 t/km2. it is rather difficult by merely relying on natural restoration of forest. In the process of cultivated land conversion into forest land and grassland, measures suiting local conditions should be adopted in tree species selection and artificial afforestation (grass planting) based on management with biological measures for slopeland and engineering measures for hilly-gullied areas, so that watershed forest coverage in key counties can reach at least over 30%.Compared with the standard period of precipitation prior to the 1960s, with the decrease of an-nual precipitation at various periods, plant productivities decline to different degrees under natural conditions. The main reason accountable for the low survival rate of new seedlings and grass over years is due to precipitation decrease. In light with regression models of annual pre-cipitation and natural vegetation productivities, it is possible to obtain estimated values of wa-tershed natural vegetation productivity and eco-water consumption needed for the restoration to

关键词： vegetation restoration, eco-water requirement, watershed sediment yield, the middle Yellow River.

Digital forestry research in{2.

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2006年第z1期49卷 1-8页

作者： TANG Shouzheng, TANG Una, Guofan Shao & DAI Limin research institute of Resource Information Techniques, Chinese {2. of forestry, Beijing 100091, china institute of Applied Ecology, Chinese {2. of Sciences, Shenyang 110016, china Departmet of forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Graduate University, Chinese {2. of Sciences, Beijing 100101, china research institute of Resource Information Techniques Chinese Academy of Forestry Beijing 100091 China institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Department of forestry Natural Resources Purdue University West Lafayette IN 47907 USA Graduate University Chinese Academy of Sciences Beijing 100101 China

Digital forestry as a concept was developed after the Digital Earth program. The Chinese scientists were not only among the pioneers who first proposed the concept of Digital forestry, but also contributed a lot to the development of Digital forestry. Digital forestry is a digital framework to maintain forest planting, management, using, and protect. The synergetic use of computationally-intensive quantitative methods together with information technologies is the most important foundation for the development of Digital forestry. Under this situation, the experience of Digital forestry development in china is relatively rich. A number of academicians, scholars, and professional administrators were involved in discussing the Digital forestry Construction Scheme. The Project of Digital forestry Practicability approved by the State forestry Administration is a major instance in developing Digital forestry standard and key techniques. By introducing a case study of Digital forestry, this paper reviews the concept of Digital forestry, the way turning traditional forestry into Digital forestry, and the future development of Digital forestry.

关键词： Digital Forest, Digital Earth, Digital forestry standard, Digital forestry techniques.

Isolation and expression study of biotin carboxyl carrier protein coding Gene(VfBCCP) from Vernicia fordil

在线全文

学校读者我要写书评

暂无评论

Isolation and expression study of biotin carboxyl carrier pr...

Spatial distribution of surface rock fragment on hillslopes in a small catchment in wind-water erosion crisscross region of the Loess Plateau

第十三届全国植物基因组学大会

作者： Qinqin Cui,Yangdong Wang~* research institute of {2. forestry,Caf,fuyang 311400,china

Biotin carboxyl carrier protein(BCCP) plays an important role as a bridge link in the reaction of Acetyl CoA carboxylase.A full-length cDNA sequence of BCCP gene was obtained from kernel cDNA library of Vernicia fordi...

关键词：

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

Science china Earth Sciences 2008年第6期51卷 862-870页

作者： ZHU YuanJun1,2.& SHAO MingAn1 1 institute of Soil and Water Conservation, Chinese academy of Sciences and Ministry of Water Resources, Northwest Agriculture and {2. University, Yangling 712.00, china 2.institute of Geographical Sciences and Natural Resources research, Chinese academy of Sciences, Beijing 100101, china 1. institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Northwest Agriculture and Forestry University Yangling 712100 China 2. institute of Geographical Sciences and Natural Resources research Chinese Academy of Sciences Beijing 100101 China

The cover and size distributions of surface rock fragment in hillslopes were investigated by using digital photographing and treating technique in a small catchment in wind-water erosion crisscross region of the Loess Plateau. The results indicated that the maximal cover of rock fragment was pre-sented at mid-position in steep hillslope. Rock fragment presented a general decreasing-trend along the hillslope in gentle hillslope. Rock fragment cover was positively related to gradient, rock fragment size decreased generally along the hillslope, and the size reduced with the gradient. The mean size of rock fragment was at a range of 6―2. mm in the steep hillslope, rock fragment size > 50 mm was rarely presented. The covers of rock fragment at different positions were markedly related to the quantities of rock fragment 40 mm. The area of rock fragment of 2.50 mm accounted for 60% or more of the total area, dominating the distribution of rock fragment in the hillslopes.

关键词： wind-water erosion crisscross region of the Loess Plateau small catchment hillslope surface rock fragment cover and size

Threat and management strategies of potentially invasive insects in china

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2009年第10期52卷 903-910页

作者： ZHANG RunZhi1, ZHANG YaPing2.& JIANG YouXu3 1 State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture, institute of Zoology, Chinese academy of Sciences, Beijing 100101,{2. 2.Kunming institute of Zoology, Chinese academy of Sciences, Yunnan, 6502.3,{2. 3 The research institute of Forest Ecology, Environment and Protection, The Chinese academy of forestry, Beijing 100091,{2. State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of Zoology Chinese Academy of Sciences Beijing 100101 China Kunming institute of Zoology Chinese Academy of Sciences Yunnan 650223 China The research institute of Forest Ecology Environment and Protection The Chinese Academy of Forestry Beijing 100091 China

The Global Invasive Species Database, GISD, comprises 2. species of the most significant invasive alien insects in the world (through November, 2.05), 6 of which are originally native to china, 11 are established in china, and 10 have a potential invasion threat to china. This paper discusses these species in terms of distribution, harmfulness and dispersal ways, and finds that: (i) Information re-garding invasive insects in the GISD remains inadequate. Such harmful invasive species as Opogona sacchari (Bojer), Oracella acuta (Lobdell), and Dendroctonus valens LeConte are not included. (ii) Ten species of invasive insects, particularly Lasius neglectus Van Loon and Linepithema humile (Mayr) which become established in areas near china, have the potential to become established in china. (iii) Special attention should be paid to species from Asia and the Americas because of their greater likeli-hood of becoming established in china. Finally, some management strategies including legislation, quarantine, early warning, prevention and control are suggested.

关键词： biological invasions invasive species insect china