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   

种子重量和出苗率对自由传粉的花旗松家系早期生长的影响     

J.B.St.Clair  W.T.Adams  佘跃辉 《甘肃林业科技》1993,(1)

观测记录了39个自由传粉的花旗松(Pseudotsuga menziesii var·menziesii[Mirb]Franco)家系的种子重量、出苗时间和苗木大小的三项标准,以便估算种子重量和出苗的家系变异及种子特性对苗木早期生长的影响。试验采用未发芽种子和萌芽种子播种,以测定用发芽种子播种能否降低种子对苗木早期生长的影响。为了评估竞争对种子重量与苗木大小、出苗率与苗木大小的关系的影响,各家系以密植混合家系区、密植纯系区、稀植非竞争区方式单株播种。结果表明:各家系在种子重量、出苗率、出苗速度方面差异显著,但种子重量与出苗率、种子重量与苗木大小、出苗速度与苗木大小间的相关关系不显著;用发茅种子播种不能降低种子对苗木早期生长的影响;家系间的竞争对增大种子效应也没有多大影响。  相似文献   

连续化学促进采脂法可提高产脂力一倍     

В.Н.科玛罗夫斯基  赵廷珪 《林业实用技术》1958,(4)

连续化学促进采脂法在中央林化科学研究所地区试验站已进行了多年试验,证明可提高产脂力一倍。这种方法是把一次往伤口涂足激素的化学促进法加以改进而成的。其特点是:化学试剂能连续不断地、一滴滴地流向侧沟,  相似文献   

Intratree Variability of Cleavage Resistance of Chinese Fir from Plantation     

XU Ming REN Haiqing LUO Xiuqin YIN Yafang Research Institute of Wood Industry  Chinese Academy of Forestry  Beijing    P. R. China 《中国林业科技(英文版)》2006,5(4):27-32

INTRODUCTION Chinese fir (Cunninghamia lanceolata) is a very important timber species in the southern China (Shi Jisen et al. 1987). It is good, fast-growing, and exempts from serious plant diseases. Its plantation is big in terms of size in the South of China and its storage stock is very rich, which is about 20% of the national commodity wood (Zhou Shuangquan et al. 2000). And the lumber becomes mainly commercial construction materials in China because of straight grain, light and so…  相似文献   

Electrophysiological and Behavioral Responses of Adult Anoplophom glabripennis (Motschulsky) to Volatile Components of Host-Plant     

Fan Hui Li Jiquan Jin YoujuCollege of Biological Sciences  Biotechnology  Beijing Forestry University  Beijing  P. R. China 《中国林学(英文版)》2003,(1)

Electrophysiological and behavioral responses of adult A. glabripennis (Motsch.) to volatiles from ashleaf maple (Acer negundo L.) were investigated to identify semiochemicals involved in host location. Measurable electroantennogram (BAG) responses were elicited to all compounds tested, the most effective antennal stimulants were trans-2-hexen-1-al,decyl aldehyde and trans-2-hexenl-ol.These profiles were similar between males and females. In Y-tube olfactometer bioassays, above three compounds with certain concentration, trans-2-hexen-l-al (1%), trans-2-hexen-l-ol (1%) and decyl aldehyde (10%), were significantly attractive to the adults in laboratory. The results show that either BAG or olfactory responding to a particular volatile compound are markedly influenced by the concentration.  相似文献   

Decay Detection of Ancient Wood Rafters in Tibet by Stress Wave Testing Method     

SHANG Dajun  DUAN Xinfang HE Xiaocui LI Jianing  WANG Ping . College of Mechanical  Electronic Engineering  Northwest Agriculture  Forestry University Yangling  P.R.China . Research Institute of Wood Industry  Chinese Academy of Forestry  Beijing  P.R.China 《中国林业科技(英文版)》2007,6(4):20-24

Visual classification and stress wave non-destructive testing technology were adopted to evaluate the decay status of ancient Populus wood members （rafters） replaced from the Potala Palace. The decay status of wood members was evaluated by stress wave testing and visual observation. For most of the ancient wood members, the evaluation results by two methods were consistent with each other. Also stress wave testing techniques can find the internal wood member decay to eliminate the hidden hazard for ancient wood members, and offer relatively accurate quantitative information for the safety status of ancient wood members. Thus during the maintaining for ancient architectures, visual observation combined with stress wave testing techniques is a good way to evaluate the degradation of ancient wood members.  相似文献   

Analysis on Schistosomiasis Occurrence And Preventive Measures in Three Gorges Reservoir     

SUN Qixiang ZHANG Jianfeng* . Silvicultural Laboratory of State Forestry Administration  Research Institute of Forestry Chinese Academy of Forestry  Beijing  P.R.China . International Center for Bamboo & Rattan  Bamboo & Rattan Laboratory of SFA  Beijing  P.R. China 《中国林业科技(英文版)》2007,6(1):82-86

Recently, due to more flooding, schistosomiasis is in expanding tendency in some areas. With Three Gorges Engineering progress, schistosomiasis will occurr potentially in Three Gorges reservoir. In order to control the disease, some methods must be applied, e.g. chemicals, biological measures. To some extent every way has its specific effect. However, the vital way is improving the environment and reducing the amount of snails. One of the effective ways is conducting forestry ecological engineering that focuses on snail control and schistosomiasis prevention. The practical ways cover such as pollution controlling, ditches surface hardening. Especially for water-level-fluctuation zone, conducting forestry ecological engineering to improve environment to prevent snails＇ propagation is significant and vital. By operating the project environment could be greatly improved and people＇s living conditions would be bettered.  相似文献   

白僵菌优良菌株的自然筛选   总被引：1，自引：0，他引：1  

范弘达  陈仙景 《福建林业科技》1991,18(2):42-49

球孢白僵菌[Beauveria bassiana(Ball)]制剂是防治马尾松毛虫的主要药物之一,菌粉年产量达数万kg以上。为了选育毒力强、人工培养菌丝生长快、产孢量高、优良品质稳定的菌株,从建阳、连城、莆田等地收集白僵菌虫体进行组织分离、单孢纯化、比较室内毒力以及在人工培养基上的性状,得到三个优良的白僵菌菌株,进行生产性试验,效果显著。  相似文献   

竹子组培苗试管内超早期开花结实     

R.S.Nadgauda  V.A.Pa-rasharami  A.F.Mascarenhas 《林业实用技术》1991,(2)

竹子开花很少,而开花后则死亡。因此,很难获得竹种。为此,采用组培法促进竹子开花结实。对刺状箣竹和苏麻竹进行组培,取得了开花结实的结果。这一技术为竹类杂交育种铺平了道路。  相似文献