马尖相思人工混交林试验初报     

杨绍增  王瑞荣  王达明  苏俊武 《西部林业科学》1996,(2)

根据在普文试验林场开展的马尖相思与高阿丁枫，马尖相思与西南桦行状混交（面积６．８３ｈｍ￣２）试验，４、５年时的阶段效果，从混交林的林分结构，生长状况，林分的土壤主要理化性状及其年度变化情况方面，论述了两种混交林与纯林的差异，以及不同行状混交方式间的差异。  相似文献   

Electromyography and spinal evoked potentials in cauda equina syndrome of dogs     

M Kornberg  P Bichsel  J Lang 《Schweizer Archiv für Tierheilkunde》1989,131(6):287-298

In order to investigate usefulness of electrodiagnostic methods in Cauda Equina-Compression, 26 dogs with this disease were subjected to electromyography and spinal evoked potentials. 16 normal dogs served as controls. It was found that--after stimulation of the Nn.tibialis, peronaeus, pudendus and coccygeales and recording at the lumbosacral junction--latencies and nerve-conduction velocities were largely normal. However the amplitudes were decreased and--depending on the severity of the compression--the morphology of the potentials was altered although considerable standard deviations were obtained. Electromyographically, increased spontaneous activity with fibrillations and positive sharp waves were found in the myotomes of the lumbosacral nerves. Their number increased according to the severity of the cauda equina compression and they had a centrifugal distribution pattern. Based on these results it appears indicated to perform an electromyographic exam before applying myelography. The technique of spinal evoked potentials will need more refinement and standardisation before being useful in a clinical situation.  相似文献   

The study on site quality evaluation for dahurian larch (Larix gmelinii Rupr.)     

Hao Wenkang  Lang Kuijian  Zhang Yanli  Li Longchang  Weng Guoqing  Huang Mingquan  Wang Xiangguo 《林业研究》1993,4(2):33-42

Site quality of larch (Larix gmelinii Rupr.) in Da Xingan Mountain in Inner Mongolia was studied systematically with about 1000 temporary plots and computer software. The nature of site class and site index curve was discussed in view of general mathematical model of height growth. The height growth of dominant tree of four divisions of forest stands were studied and site index tables were constructed respectively. In order to unify the comparing standard and convenience for management in this region, site index table was constucted too. Based on discussing the action and accuracy of forest type, a series of site quality evaluation (forest type-site index class-site index) was suggested. This subject of study is supported by the National Natural Scientific Fund (No. 39270549).  相似文献   

crataegus grayana的组织培养     

杨戈 《干旱区研究》1989,(3)

同许多种其它果树一样,山植属的Crataegus grayana也可应用组织培养的方法,进行快速繁殖。在加入0.25ppmBA,0.5ppmIAA以及150ppm水解干酪素的MS培养基上,可由胚得到实生苗。在加入0.5ppm和300ppm水解干酪素的MS培养基上,由茎尖与茎段可得到壮实的试管苗。由于该植物胚在第一年内成熟度甚低,因此用茎尖或茎段进行快繁殖远优于用胚来进行。从此项研究结果看,其繁殖率为2~n-3~n(n为∮月数)。  相似文献   

我国住宅现代化生产相关问题研究     

杨明  曹峰军  金虹 《林业科技情报》2002,34(2):21-22

本文从我国住宅产业发展现状入手,针对我国住宅现代化生产相关问题进行分析和研究,提出住宅产业现代化的是解决住房矛盾的前提、模数协调是住宅现代化生产的技术基础、认证制度是住宅现代化生产的有力保证、住宅性能评价体系是住宅现代化生产的重要内容的观点,对当前形势下我国住宅产业的发展方向具有一定的指导意义。  相似文献   

苏云金杆菌与杀灭菊酯防治红铃虫的试验          下载免费PDF全文

罗绍彬  蔡昌建  阎建平  梁世平  张用梅  张益  杨喜凤 《植物保护学报》1985,12(3):213-216

苏云金杆菌(Bailus thuringiensis)140或018工业菌剂每亩用200～255克,加杀灭菊酯20%乳剂每亩8毫升混用防治第二、三代红铃虫,虫口减退率和铃害下降率分别为80.5～93.4%和68.8～84.6%;杀灭菊酯每亩40毫升单用效果分别为96～97.2%和84.6～95.8%,都能有效控制红铃虫的危害。棉花产量测定表明,菌剂加菊酯混用使皮棉增加21.3～30.9%,菊酯单用增加11.4%。  相似文献   

甘薯新品种综合评价初探     

卢新建  吕美琴  付文泽  李阳溪  王文农 《杂粮作物》2001,21(6):18-20

对福建省新育成甘薯品种应用灰色加权关联度分析法进行综合评估，旨在鉴定新品种在丘陵旱地的适应性以及探讨出一种比较适宜的品种评估方法。结果表明，龙薯1号、莆薯41和泉薯647比较适应东南沿海丘陵旱地生产条件，评估结果与品种的实际表现比较一致。  相似文献   

改进芳草A系原种产卵性的试验     

靳远祥  杨明观  陈玉银 《蚕桑通报》2001,32(1):19-23

本试验采取母蛾延迟交配，拆对后冷藏、改变交配时间和产卵室保护温度等技术措施来探讨改善芳草A系原种产卵性的方法。结果表明，这些措施对产卵性能的改进有一定的效应，但由于性状间存在相关关系，对某一性状的促进效应往往同时也对另一产卵性状产生负向影响。  相似文献   

普通番茄与秘鲁番茄杂种后代的形态,亲和性及抗性表现   总被引：1，自引：0，他引：1  

徐鹤林  吴鹤鸣 《园艺学报》1991,18(3):233-238

继获得普通番茄‘北京早红’与秘鲁番茄杂交种后,本试验着重于对杂种后代的形态、亲和性及抗性表现的观察,杂种的多数性状为双亲中的显性性状或双亲的中间型,但也表现了一些奇异性状,如果实的颜色和花序的形状与排列通过株间的“杂交”克服了杂种的高度自交不亲和性,从而顺利得到杂种的自交后代;杂种各世代均高抗TMV 0株系和1株系,并有部分选系抗TMV 1·2株系,由此判断秘鲁番茄亲本可能具有TM~a_2基因;用南京地区CMV厥叶株系和强株系分别接种,各世代表现部分抗病或耐病。  相似文献   

Ouabain-sensitive Na/K-ATPase activity increases during embryogenesis in the giant freshwater prawn Macrobrachium rosenbergii     

Marcy N Wilder  Do Thi Thanh Huong  Atsuro Okuno  Muharijadi Atmomarsono  Wei-Jun Yang 《Fisheries Science》2001,67(1):182-184

  相似文献