竹柳引种试验初报   总被引：6，自引：0，他引：6  

吕德文 《防护林科技》2011,(5):42-43,53

对不同造林密度和不同混交方式竹柳的适生状况进行了初步研究,结果表明:随着造林密度的增加,竹柳的保存率呈线性下降趋势,生长状况也呈下降趋势,以3 750株.hm-2的造林密度具有较好的保存率和生长状况;当混交比例为5∶5时,竹柳的保存率和生长状况较好,可在造林实践中进一步推广,但不同混交树种间未表现出显著差异,可能跟造林时间较短,其适生性状未得到充分表现有关。  相似文献   

柳树重组复合材生产技术及质量控制     

史建伟  李梅  徐迁昌 《吉林林业科技》2011,40(2):29-31

柳树重组复合材,是将柳树枝加工成柳枝丝束,通过模具,经冷压、高温固化而成的型材.制造工艺为:柳树枝碾压→丝束干燥→树皮分离→浸胶→干燥→组坯→板坯冷压→高温固化→脱模→柳树重组复合型材.本文还介绍了柳树重组复合材的生产技术及质量控制技术.  相似文献   

Micromorphological studies on the small intestine and caeca in wild and captive willow grouse (Lagopus lagopus lagopus)     

I Hanssen 《Acta veterinaria Scandinavica》1979,20(3):351-364

The present study describes the micromorphology of the small intestine and caeca of wild and captive willow grouse. The micromorphology of the small intestine was similar in wild and captive birds, while typical differences were apparent in the caeca, Wild grouse had ciliated epithelium without goblet cells in the neck part of the caeca, captive birds had strongly atrophied cilia and a high number of goblet cells. The epithelium of the body part of caeca of wild birds lodged a great number of spiral-shaped microorganisms and amoebae, which were absent in captive birds. Both the caecal villi and the longitudinal folds were much larger in wild than captive grouse. In the captive grouse the caecal lamina propria was heavily infiltrated with mono-nucleated cells and very often also with polymorphonucleated heterophilic leucocytes.Since only first generation captives were used in this study, the differences in gut morphology of captive and wild grouse must be due to different food and environmental conditions and not to genetic selection.  相似文献   

日本菟丝子吸器发育解剖的研究   总被引：3，自引：0，他引：3  

黄建中  李扬汉 《南京农业大学学报》1987,(2)

吸器由吸器原基发育而来,吸器原基是从茎的皮层细胞脱分化而来的。依脱分化的细胞数量不同,可分为两种类型。文中对成熟吸器的结构进行了描述。吸器中管胞和筛管都是从吸器中央具有原形成层特性的细胞分化的,管胞的分化先于筛管,或同时进行。吸器原基顶端的细胞具有典型的分生组织的特征,“菌丝”分化成输导组织。它与寄主木质部导管的连接有三种方式,与寄主韧皮部筛管的连接也有三种方式,并对三种不同方式的“菌丝”细胞壁突起进行了讨论。  相似文献   

四种药剂注射法防治柳树光肩星天牛对比试验   总被引：1，自引：0，他引：1  

崔子立 《现代园艺》2014,(22):7-8

选用4种药剂对光肩星天牛进行注射法试验,结果表明,施药后2天,0.025kg/L高效氯氟氰菊酯EC40倍液和40%氧化乐果EC40倍液效果最好,防治率分别达到73.81%和73.89%。  相似文献   

哈尔滨石化公司柳树除絮分析   总被引：1，自引：0，他引：1  

谭晓峰 《黑龙江农业科学》2013,(10):93-95

杨柳飞絮严重污染石化厂区环境,对设备空冷、水处理厂、动火作业、人员健康和交通安全有一定危害,为避免或减少飞絮带来的危害,针对哈尔滨地区飞絮的时间及特征进行了细致分析,对比更换飘絮树种（选择雄株树木）、选择抑花一号药物注射抑制、增加人工修剪及人工喷水增湿等除絮技术方法,筛选出北京园林科研所研制的抑花一号除絮效果最好,进而对哈尔滨石化公司柳树飞絮进行3a的防治应用研究。结果表明,目前柳絮发生量控制率达85％以上,通过对防絮工作的摸索和现代技术的运用,有效地减少了飞絮现象减轻了其危害。  相似文献   

Soil‐ecological evaluation of willows in a floodplain     

Dana Zimmer  Christel Baum  Ralph Meissner  Peter Leinweber 《植物养料与土壤学杂志》2012,175(2):245-252

Willows (Salix spp.) were supposed to be suitable candidates for the phytoremediation of polluted floodplain soils, but it is unknown how willow growth alters concentrations and mobility of pollutants under the conditions of ongoing periodically flooding. Therefore, effects of willow cropping on total concentrations and mobility of As and heavy metals and soil microbial properties were determined after three and four growing seasons under willows in comparison to native grassland in a flood channel of a River Elbe floodplain (Central Germany). After 4 y of willow coppice, the heavy metal concentrations (mg kg^–1) were increased not only in the grass control plots (final Cu 274, Pb 276, Zn 935) but also under the willows (final Cu 248, Pb 251, Zn 779) compared to the initial concentrations (initial Cu 170, Pb 156, Zn 579). This increase might likely be caused by the ongoing sedimentation by flood events. The smaller increase under willows compared to grass might be related to an initial net effect of phytoextraction. The concentrations of the mobile fractions of Cd, Cu, Ni, and Zn were significantly lower under willows than under grass. Higher β‐glucosidase activities under willows than under grass might indicate a starting net decomposition of organic matter. Therefore, the study of long‐term and large‐scale effects are recommend before an appropriate evaluation of willow short‐rotation coppice for phytoremediation of polluted floodplains will be established.  相似文献   

基于种子带模式小区精密播种装备的研制   总被引：3，自引：3，他引：0  

王家胜  尚书旗 《农业工程学报》2012,28(26):65-71

摘要：为了提高小区播种的精确性和均匀性,研制了一套可适用于多种作物的基于种子带模式的精确播种装备。该套装备由种绳编织机和种绳播种机组成。种绳编织机采用气吸式排种器将种子播在种子带上并编制成种绳,排种器可通过更换带有不同尺寸和不同数量吸孔的吸种辊筒来适应多种作物的种子不同株距和不同播种量要求。种绳播种机可以实现起垄、垄定型、开沟、铺设种绳、覆土和镇压等功能。以胡萝卜为对象进行了机器播种性能试验,种绳编织机2.7%的漏播率和96.3%的株距合格率表明排种器具有很好的排种均匀性。92.3%的播深合格率以及95.7%的种子发芽率表明种绳播种机能够很好地满足农业作业要求。  相似文献   

乌鲁木齐市及其周边地区柳树害虫及寄生蜂资源初步研究   总被引：1，自引：1，他引：0  

李勤  唐秀丽  王朝  胡红英 《新疆农业科学》2012,49(7):1229-1237

[目的]通过对乌鲁木齐市及其周边地区柳树食叶害虫及寄生蜂资源初步调查研究,为柳树食叶害虫的生物防治提供参考依据.[方法]在乌鲁木齐及其周边柳树上,柳树害虫大暴发大泛滥时期,进行网扫并且徒手采集柳树害虫各龄期标本及寄生蜂标本,将其带回实验室进行鉴定、分组解剖、饲养.[结果]发现了5种主要柳树害虫,其中杨毛臀萤叶甲的危害最严重;其次是柳虫瘿叶蜂;再次是叶蝉,数量较多,但危害程度不 是很明显;而柳蚜和斑潜蝇,数量较少,危害程度也较小;同时发现了693只寄生蜂,隶属于11科.其中数量和种类繁多的类群依次为姬小蜂科、细蜂科和蚜茧蜂科.[结论]通过在柳树食叶害虫暴发期间调查,发现的5种主要柳树害虫在危害程度上虽有差异,均未造成柳树死亡的现象,但对柳树的正常生长和园林景观效果带来了严重危害,需要对其进行及时防治;同时发现柳树害虫的寄生蜂资源丰富,这为今后利用寄生性天敌防治害虫提供了广阔前景.  相似文献   

Effect of dietary willow herb,Epilobium hirsutum extract on growth performance,body composition,haematological parameters and Aeromonas hydrophila challenge on common carp,Cyprinus carpio     

Somayeh Pakravan  Abdolmajid Hajimoradloo  Rasool Ghorbani 《Aquaculture Research》2012,43(6):861-869

The present study was conducted to evaluate the use of Epilobium hirsutum extract in diet of common carp, Cyprinus carpio (20 ± 2 g). Different levels of plant extract (0%, 0.5%, 1, 3% and 3%+2‰ multivitamin (2 g of multivitamin per kg diet) were spread on commercial diet. The feed was offered by 8 weeks. Results showed that fish fed experimental diets had no significant difference (P>0.05) in specific growth rates, condition factor, feed conversion ratios and survival compared with control. There were no significant difference (P>0.05) in moisture, crude protein, crude lipid and ash content of common carp fed diets containing various levels of plant extract. The mortality of fish challenged by Aeromonas hydrophila have been recorded for 30 days after challenging, results showed that mortality decreased significantly (P<0.05) in fish fed diet containing plant extract compared with the control. The lowest mortality observed in group fed diet containing 3% plant extract. Haematological parameters showed that white blood cells had significantly (P<0.05) increased in infected and uninfected groups compared with the control. Red blood cells, haemoglobin and haematocrit had no significant change (P>0.05) in infected and uninfected groups compared with the control.  相似文献