Construction of cDNA Library from Populus euphratica   总被引：1，自引：0，他引：1  

Yu Guangjun Wang Yiqin Shen Xin * College of Biological Sciences  Biotechnology  Beijing Forestry University  Beijing  P.R. China Genetics Institute  Chinese Academy of Sciences  Beijing  P.R. China 《中国林学(英文版)》2003,5(2):7-9

1 Introduction Populus euphratica is a salt tolerant tree species, which is mainly distributed in the desert regions in northwest China (Wei 1993). Moreover, it is the only large tree species, which can survive and develop into forest in these arid and saline-alkali areas. P. euphratica forest plays a very important role in restraining the expansion of desert, maintaining ecological environment in west China, protecting the biological diversity and raising the local people抯 living standard…  相似文献   

Researches and Application of Fuelbreaks in China     

TIAN Xiaorui SHU Lifu WANG MingyuThe Research Institute of Forest Ecology. Environment  Protection. Chinese Academy of Forestry. Beijing  . China 《中国林业科技(英文版)》2002,(4)

The fuelbreaks were established in south China from 1950s. With the active work of local communities and state government, the fuelbreaks have been built for 398,000 kilometers. In some areas, fuelbreaks and firebreaks have constructed a network primarily, such as in the provinces of Fujian, Guangdong, Guangxi. The fuelbreaks can prevent forest fire effectively. That has been approved by actual examples and burning tests. The fuelbreaks also benefit the forest ecosystem and environment. This paper makes a review on fuelbreaks research and application in China, discussed present research achievements about fuelbreaks mechanism and its development. In the future, the Chinese government and local communities will increase investment in the construction of firebreaks network with fuelbreaks as focal points.  相似文献   

Impact of Land Tenure Change on Land Use     

LI Tiehua XIANG Wenhua XU Guozhen ZENG Guangzheng School of Resource  Environment  Central-south Forestry University  Changsha  P.R.China 《中国林业科技(英文版)》2005,4(2):82-86

China is a public ownership country. At present, theownership of land belongs to the country andcollectivity. In China, the meaning of ownership ofland is the light that the owners of land can possessthe land, use the land, get some interest from the landand deal with the land according to laws. The 4 sectionsof ownership of land can either be combined or beseparated to carry out. In practice, these 4 sections ofownership are usually separated to carry out. The tenureof land is an independent…  相似文献   

Ultrastructural and Extracellular Protein Changes in Cell Suspension Cultures of Populus euphratica Associated with Low Temperature-induced Cold Acclimation   总被引：1，自引：0，他引：1  

Dai Huanqin Lu Cunfu* Zhang Hui Zhang Xujia College of Biological Sciences  Biotechnology  Beijing Forestry University  Beijing  P. R. China Institute of Biophysics  Chinese Academy of Sciences  Beijing  P. R. China 《中国林学(英文版)》2003,5(4)

Populus euphratica Olive is the only tree species that can grow in the saline land and also survive cold winters in northwest China, and it plays a very important role in stabilizing the vulnerable ecosystem there. A cell suspension culture was initiated from callus derived from plantlets of Populus euphratica. Cold acclimation was induced (LT50 of-17.5 ℃) in cell suspension at 4-5 ℃ in the dark for 30 days and the freezing tolerance increased from LT50 of-12.5 ℃ in nonacclimated cells to LT50 of-17.5 ℃ in cold-acclimated cells. Microvacuolation, cytoplasmic augmentation and accumulation of starch granules were observed in cells that were cold-acclimated by exposure to low temperatures. Several qualitative and quantitative changes in proteins were noted during cold acclimation. Antibodies to carrot extracellular (apoplastic) 36 kD antifreeze protein did not cross react on immunoelectroblots with extracellular proteins in cell suspension culture medium of Populus euphratica, indicating no common epitopes in the carrot 36 kD antifreeze protein and P euphratica extracellular proteins. The relationship of these changes to cold acclimation in Populus euphratica cell cultures was discussed.  相似文献   

Study on Growth and Genetic Gains of Different Families in Eucalyptus urophylla Second Generation Seed Orchards     

LI Guangyou XU Jianmin BAI Jiayu QI Shuxiong LU ZhaohuaResearch Institute of Tropical Forestry .CAF. Guangzhou  Guangdong. P.R. China Adivsers Committee. Sino-Forest Corporation. Zhanjiane . P.R. China 《中国林业科技(英文版)》2003,(4)

A second-generation seedling seed orchard including 32 open-pollinated families of Eucalyptus urophylla was built at Gaoyao City, Guangdong Province to examine the genetic performance of the orchard, which were selected from the superior trees in an improvement seed orchard. Compared to the characteristics of height, DBH, individual volume, stem form, branch and blossom quantities among different families at 22 months. The results indicate that: (1) The most superior families in individual volume and blossom quantities include No. 11,8,40,27 and 2 families; (2) With the 50%-selected rate, the genetic gain of individual volume of the superior families from seed orchard was estimated to be 4.84%.  相似文献   

Tropical Timber Trade Flows in P.R. China     

HU Yanjie LIN Fengming SHI Kunshan Research Institute of Forestry Policy  Information  Chinese Academy of Forestry  Beijing  P.R.China 《中国林业科技(英文版)》2007,6(2):62-73

The historical transition of timber distribution pattern in China was presented firstly with main parts of timber flows in China, which included timber markets, timber transport system and regulations of timber transport. Based on the overview on tropical timber flows in China, the trade flows of tropical timber from production and imports of tropical timber to export of tropical timber products were analyzed by vivid illustrations. At the same time, problems in timber trade flows in China were analysed in the end.  相似文献   

The severity and cause of leaf spot disease of Pongamia pinnata L. and fungicidal control of the pathogen     

M.A.U. Mridha　F. Jabbar　M. K. Bhuiyan　M. Rahman　F. Akter　S. Dewan 《林业研究》2007,18(3):236-240

A survey on the symptom and severity of the leaf spot disease of Pongamia pinnata L. was conducted in the nurseries of the Institute of Forestry and Environmental Sciences, University of Chittagong （IFESCU）, Bangladesh Forest Research Institute （BFRI） and Aronnak Nursery in Chittagong. The highest infection percentage and disease index were found in IFESCU nursery, followed by BFRI and the lowest was recorded in Aronnak nursery. The associated organism of leaf spot disease of P. pinnata was isolated from the diseased plant parts and the pathogenicity was established with the isolated fungus. Colletorichum gloeosprioides Penz was proved to be pathogenic. The inhibition of mycelial growth of C. gloeosporioides was observed and identified as suitable fungicides （Bavistin, Cupravite and Dithane M-45） and doses （0.05, 0.10, 0.50, 1.00, 1.50 and 2.00）. The lowest and highest mycelial growth were respectively found on Bavistin and on Cupravite at the concentration of 0.05 after 8th day of incubation. It indicates that out of the three tested fungicides, Bavistin showed most effective, followed by Diathane M-45, and Cupravite was ineffective for its very little inhibition on mycelial growth.  相似文献   

新西兰辐射松根朽病与温度、湿度关系的数量模型^*   总被引：4，自引：0，他引：4       下载免费PDF全文

束庆龙  宋淑梅  赵卫中  N.M.Self 《林业科学研究》1995,8(6):694-697

新西兰辐射松根朽病与温度、湿度关系的数量模型束庆龙，宋淑梅，赵卫中，Ｎ．Ｍ．Ｓｅｌｆ关键词辐射松根朽病，温度，降雨量，土壤湿度，数量模型早在１９３０年，新西兰就有关于４年生辐射松ＰｉｎｕｓｒａｄｉａｔａＤ．Ｄｏｎ幼树受根朽病危害致死的报道［１］。６０...  相似文献   

兰考泡桐和刺槐幼苗最适营养需要的研究   总被引：10，自引：0，他引：10  

贾慧君 Inge.  T. 《林业科学》1989,25(1):1-6

按稳态营养理论和方法,本文研究了兰考泡桐(Paulownia elongata)和刺槐(Robinia pseudoacacia)幼苗的最适营养需要。通过每天测定和调整培养液pH值和电导率,及时补偿消耗的营养物,幼苗体内营养状况和最大生长速率均保持稳定。兰考泡桐幼苗每天生长率高达25％以上,刺槐达15％。营养物利用率90％以上。确定兰考泡桐幼苗最适营养物比例为100N:75K:18P:7Ca:8.5Mg;刺槐为100N:60K:15P:8Ca:9Mg。本文还讨论了最适营养研究在育苗和林地施肥应用的前景。  相似文献   

桉树—对其前景的展望     

R.M.Ray  张晓峰 《西部林业科学》1985,(2)

“请给我200株桉树苗。”“难道你不想要30个树种中的其他树苗吗?我们有象Gubabul,竹子和酸角(罗望子)苗,”我问这个农民。“不,谢谢,”他回答。“有人对我说,桉树吸收的水分太多。”这是我常常从城里人或农民那里听到的。从社会上可以听到两种相反的意见。很  相似文献