西藏河谷地区几种主要引种杨树苗木生长研究     

廖俊国 《中南林业科技大学学报(自然科学版)》1996,(1)

杨树是西藏河谷地区的主要造林树种．其中北京杨为传统的主栽品种．１９９４年引进毛白杨、中林诸杨和优胜杨进行扦插育苗试验，结果表明，其成活率可达到７０％左右，毛白杨的成活率可达到８７％，与北京杨差异不大．在栽培措施相同的条件下，毛白杨的地径生长量、高生长量、光合速率、总叶面积和最大光合速率，分别比北京杨高１４．２％，２２．３％，２４．６％，４６．１％和６２％．说明在该区引种毛白杨具有发展潜力．  相似文献   

速生丰产林培育目标和主伐年龄研究     

陈清平  廖涵宗 《福建林业科技》1995,22(1):9-13

林木培育目标应根据林分立地条件类型、林分生长类型等级、森林经营集约度和社会材种需求综合确定。通过林木定向培育提早主伐年龄以获得较高目的材种产量。对大径材培育主伐年龄应先与工艺成熟龄比较后确定。良种化林木培育是森林经营水平的重要标志，与Ⅰ类林分相比仍提早主伐年龄，增加材种产量１倍左右。应具体分析目前速生丰产林生长状况，林龄面积分布等，调整林木培育目标和主伐年龄，以保证森林资源的永续利用。  相似文献   

浅谈宁明县边境生物防火林带建设     

廖锦峰  姚乃友  黄华庆 《森林防火》2007,(4):37-38

国境线上引发的森林火灾隐患性大,为预防、阻隔、切断境外山火蔓入,营造边境生物防火林带是一项重要措施.介绍边境生物防火林带的设置、树种选择、种植抚育、经营管理,分析其效能及作用.  相似文献   

基于GIS的森林消防指挥信息系统的构建   总被引：4，自引：0，他引：4  

廖建国 《森林防火》2005,(1):11-13

介绍了综合运用现代信息技术与网络通讯技术,设计和开发的福建省泉州市森林消防指挥系统的建设目标,运行的硬件、软件环境,系统设计原则。详细阐述了包括电子监控微波传输与卫星图像接收处理,林业基础信息管理,消防队伍、物资与生物防火林带、隔离设施管理,火灾损失评估与统计管理,多媒体信息管理5个子系统在内的系统总体构建及各子系统技术设计与功能。  相似文献   

Slash pine (Pinus elliottii Engelm.) somatic embryogenesis I. Initiation of embryogenic cultures from immature zygotic embryos     

Y. K. Liao  H. V. Amerson 《New Forests》1995,10(2):145-163

Immature female gametophytes and enclosed zygotic embryos of slash pine (Pinus elliottii Engelm.) collected at various developmental stages were cultured either on eight initiation media supplemented with different plant growth regulator (PGR) combinations or on LPM medium solidified with two brands of agar. Embryonal-suspensor cell masses extruded from gametophyte explants infrequently produced white or translucent mucilaginous embryogenic cultures. Variation in extrusion frequency was observed across seed sources (families), explant collection dates, agar types and culture media. Increased explant maturity (as related to collection dates) reduced cell extrusion rates. Four types of extrusions were grouped according to their morphology. One type of extrusion produced the greatest number of established and long-surviving embryogenic cultures. This extrusion type (type I) was associated with an extrusion condition termed empty in which the entirety of the embryonal-suspensor mass was extruded out of the gametophyte. Three other extrusion types (types II, III and IV) showed less culture establishment and survival.  相似文献   

削度方程的研究   总被引：22，自引：3，他引：22  

曾伟生  廖志云 《林业科学》1997,33(2):127-132

从削度方程的概念入手，对削度方程的结构形式进行了深入研究，提出了具有最佳结构的削度方程的一般形式，并以湖南省杉木为例，确定了最佳削度方程的具体形式。试验结果表明，建立的新模型要优于以往发表的任何削度方程  相似文献   

枫香木材改性利用研究     

陈光华  瘳可军  宋培璋 《中南林业科技大学学报(自然科学版)》1994,(1)

采取清水浸泡、药物蒸煮、干燥和ＰＣ树脂浸渍处理等措施，对易裂难干、易发生翘曲变形、使用价值较低的枫香木材进行改性处理，可以显著降低其干缩差异，减少翘曲变形，实现均匀干燥．从而大大改善其加工性能和耐腐程度，提高利用价值．实践证明，以浸泡时间为６个月，蒸煮时间为４８ｈ，药量配比为１号药液：２号药液＝０．５％：１．５％进行改性处理的效果最为理想．  相似文献   

海桑种子发芽条件的研究     

廖宝文  郑德璋  郑松发  李云 《中南林业科技大学学报(自然科学版)》1997,(1)

对影响海桑种子发芽的因子即光照、温度、海水盐度和pH值进行了研究．结果表明：海桑种子为需光种子，种子萌发需有光敏素的参与．缺乏光照是造成种子发芽率低和不整齐的主要原因，播种前将种子在湿润状态下用700lx的光照射24～36h或用体积分数为10－3的外源赤霉素（GA3）溶液浸泡36h，即可显著提高发芽率和发芽势；实验室发芽适宜温度为30～40℃，最适为35℃；海水盐度在10‰以下有利于海桑育苗，最适盐度为2．5‰；酸碱度对种子发芽影响不大，种子在pH为4～11时均可正常萌发生长．  相似文献   

Seasonal variations in photosynthesis of Picea morrisonicola growing in the subalpine region of subtropical Taiwan     

Weng JH  Liao TS  Sun KH  Chung JC  Lin CP  Chu CH 《Tree physiology》2005,25(8):973-979

From January 1999 to May 2001, we investigated seasonal variations in the photosynthetic capacity of Taiwan spruce (Picea morrisonicola Hay.) growing in the subalpine region of subtropical Taiwan (23 degrees 29' N, 120 degrees 53' E, 2600 m a.s.l.). Photosynthetic capacity (near light-saturated net photosynthetic rate, Pnsat, chlorophyll fluorescence (Fv/Fm) and soluble protein concentration of needles all increased from mid or late spring to early winter. Even when minimum air temperature of the measuring day dropped to near 0 degrees C, Pnsat remained at about 20% of the highest value observed in winter. There was a curvilinear relationship between Fv/Fm and the minimum or mean air temperature of the measuring day. The increase in Fv/Fm with temperature was slowed when the daily mean air temperature was above 7 degrees C, or the minimum air temperature was above 3 degrees C; however, when air temperatures dropped below these values, Fv/Fm varied sharply. Seasonal variations in Pnsat paralleled those in Fv/Fm and needle soluble protein concentration. In early or mid spring when air temperature and Fv/Fm increased, Pnsat and soluble protein concentration remained low. Multiple regression analysis showed that seasonal variations in Pnsat were affected by Fv/Fm, air temperature and needle soluble protein concentration, and the multiple regression equation could be used to estimate Pnsat in different seasons. We conclude that the decrease in photosynthetic capacity of Taiwan spruce in winter and its subsequent recovery in spring were mainly caused by photoinhibition and its reversal, and changes in needle soluble protein concentration. Another possible explanation for the delayed recovery of photosynthetic capacity in spring may be associated with the slow increase in needle soluble protein concentration.  相似文献   

湖南珍稀濒危植物迁地仿生护存的初步研究     

颜立红  彭春良  夏晓敏  廖舫林 《中南林业科技大学学报(自然科学版)》1997,(3)

由于人为破坏和环境条件的恶化，许多植物资源处于濒危灭绝状况，一种植物的灭绝，又将导致10～30个生物种的消失．为了保护珍稀濒危植物，保护生态环境，根据迁地护存植物的生物学特性、生态学特性及其原产地的生态环境条件，应用植物引种原理，从1986年开始，在湖南省森林植物园，对湖南和邻近省的一些珍稀濒危植物进行了迁地仿生护存的初步研究．共迁地护存珍稀濒危植物124种，现保存118种，保存率95．16％．其中，湖南省分布的国家级珍稀濒危植物57种，邻近省的27种，省级保护植物34种．这些植物中，年均高生长60cm以上的有25种，30～60cm的有42种，小于30cm的有51种．  相似文献