大豆多肽对西洋参生物生长量与人参皂苷Rb1含量的影响     

门敬菊  王振月  康毅华  王宗权  唐先明  侯志勇  赵海鹏  侯素云 《中国林副特产》2005,(6):3-6

研究大豆多肽对西洋参(Panax quinquefoliusL.)生物生长量和人参皂苷Rb1含量的影响。将大豆多肽2号粉和3号粉分别配制成高、中、低3种浓度的水溶液,以叶面喷洒与根部灌注的方式,对生长3年的西洋参进行实验;同时观察生物生长量和人参皂苷Rb1的变化并总结规律。大豆多肽2号粉4mg/ml浓度根部灌注对西洋参生物生长量与人参皂苷Rb1增加作用最明显。研究结果为提高西洋参产量与质量提供理论依据,在西洋参的栽培种植中起到了实践指导作用。  相似文献   

Supercritical fluid impregnation of wood with biocides using temperature reduction to induce deposition     

Sung-Mo Kang  Keith L. Levien  J. J. Morrell 《Wood Science and Technology》2005,39(5):328-338

The potential for using temperature reductions to induce biocide deposition at the end of biocide treatment was assessed using Cyproconazole to treat ponderosa pine sapwood boards. Temperature-induced deposition produced higher biocide loadings and steeper preservative gradients from the surface inward than the more commonly used pressure-induced deposition. The results are discussed in relation to treatment results, process time, and the ability to recover treatment components.  相似文献   

杉木间伐小径材材性试验研究   总被引：7，自引：0，他引：7  

洪成器  苏伟毅 《福建林业科技》1992,19(4):6-13

杉木间伐小径材材性试验结果与成材杉木比较:密度小,晚材率较低,生长较快,吸水性较强;材质为未成熟幼林材种,物理性质较差,力学强度有所降低,作为建筑结构用材时,在设计与施工中必须注意到其强度的降低,采取必要的措施。杉木间伐小径材纤维长度与成材相似,纤维宽度略宽、纤维长宽比值略小,但尚为良好的纤维原料。  相似文献   

Effect of pruning intensities of three woody leguminous species grown in alley cropping with maize and cowpea on an alfisol     

B. Duguma  B. T. Kang  D. U. U. Okali 《Agroforestry Systems》1988,6(1-3):19-35

Field trials were carried out on an Oxic Paleustalf in the humid zone of southwestern Nigeria withLeucaena leucocephala (Lam.) de Wit,Gliricidia sepium (Jacq.) Steud. andSesbania grandiflora (L.) Pers. alley cropped with maize and cowpea. The three leguminous woody species were grown in hedgerows spaced at 2 m. Trials were carried out one year after establishment of the hedgerows using a split-plot design with four replications. TheLeucaena trial had twenty pruning combinations consisting of five pruning heights (25, 50, 75, 100 and 150 cm) and four pruning frequencies (monthly, bi-, tri- and six-monthly). TheGliricidia andSesbania hedgerows were subjected to nine pruning intensities consisting of three pruning heights (25, 50 and 100 cm) and three pruning intensities (monthly, tri- and six-monthly). For the three woody species, biomass, dry wood and nitrogen yield from the hedgerow prunings increased with decreasing pruning frequency and increasing pruning height. Biomass, dry wood and nitrogen yields were in the following orderLeucaena >Gliricidia >Sesbania. The various pruning intensities had no effect on survival ofLeucaena plants. Pruning frequency had a larger effect than pruning height on survival ofGliricidia andSesbania plants. With monthly pruning, about 25 percent of theGliricidia and all of theSesbania plants died within six months of repeated pruning. Even with lower pruning frequencySesbania plants showed lower survival rates thanGliricidia orLeucaena. The various pruning intensities of all the hedgerow species had more pronounced effects on the grain yield of the alley cropped cowpea than on maize grain yield. Higher maize and cowpea yields were obtained with increasing pruning frequency and decreasing pruning height. IITA Journal paper number 335  相似文献   

杭州城区高架桥绿化现状与植物的选择   总被引：8，自引：0，他引：8  

徐康  夏宜平  张玲慧  杨霞 《浙江林业科技》2003,23(4):47-50

分析了杭州市城区高架桥(含立交桥，下同)绿化植物品种，探讨了高架桥绿化植物品种的选择方法，并提出了高架桥绿化养护保水第一的观点。  相似文献   

Papyriflavonol A, a new prenylated flavonol from Broussonetia papyrifera   总被引：3，自引：0，他引：3  

Son KH  Kwon SJ  Chang HW  Kim HP  Kang SS 《Fitoterapia》2001,72(4):456-458

A new prenylated flavonol, papyriflavonol A, was isolated from the root barks of Broussonetia papyrifera. The structure of this compound was elucidated as 5,7,3',4'-tetrahydroxy-6,5'-di-(gamma,gamma-dimethylallyl)-flavonol (1) by spectroscopic analysis.  相似文献   

检查法林分生长预测及择伐模拟研究   总被引：5，自引：0，他引：5  

李法胜  于政中 《林业科学》1994,30(6):531-539

检查法是一种适合于异龄林经营的集约作业方法，由于目前试验时间还较短（第１择伐周期１９８７－１９９２年），需要对其长期经营效果作出预测。文中提出了一种修正参数预测模型（ＭＰＰＭ）和线性规划方法相结合对于林分进行生长预测和择伐模拟研究的方法。拟合林分直径分布采用了形状灵活的Ｗｅｉｂｕｌｌ分布形式，使得这种方法很适合于异龄林分（反Ｊ形直径分布）的生长预测（当然也适于同龄林），特别是当径阶株数出现突然变化  相似文献   

NUTRIENT CYCLING IN THE DAHURIAN LARCH PLANTATION ECOSYSTEM     

杨文化  高恩柱  亢宇 《林业研究》1995,6(4):14-18

TllcbiologicalcycIingofnutricntclc-lllcntslntl1cccosystclnisthecyclingbctweentllcplantconununityandsoilwitl1intheccosys-tclll(Ot/ington,l986).ltformsol1ebranchofbiogQochcn1icalcyclesandislnarkedwitl1higl1spccdal1dil1tcl1sit}'.Biologicalcyclcofnutri-cntclenlcntsiscorrelatedwithforestproduc-tit'it3'closcly-tbeabsorptionandutilizatio11ofthe11utricntelemcntsoftheplantareillflu-cnccddircctl3'orindirectlybykindsofenvi-ronn1cntallbctorsandsomephysiologicalandlllatcrialproducingprocessareattectcd.Sot…  相似文献   

樟子松成熟胚的离体培养与不定芽的形成     

康明  田建强  郑均宝 《河北林果研究》1993,(4)

沙藏45d的樟子松种子,剥胚培养在5个系列17种培养基上.在6BA0.2～2.0(mg/L,单位下同)+NAA0.05～0.5以及6BA1.0+IAA0.2～0.5的激素配比范围内,可诱导胚形成不定芽.KT与NAA或IAA配合时无不定芽形成.不定芽分化部位明显受激素种类控制,6BA与NAA配合可诱导胚轴分化出不定芽,而6BA与IAA配合,则可从子叶顶端和基部诱导出不定芽。  相似文献   

滴灌条件下4种树木生长发育规律的研究   总被引：4，自引：0，他引：4  

朱玉伟  陈启民  刘康  李素英 《防护林科技》2005,(1):1-4,17

通过对南疆干旱地区荒山绿化所采用的胡杨、沙枣、柽柳和白榆等4种主要造林树种在滴灌条件下的生长发育规律进行研究,结果表明:4种树木在滴灌条件下根系分布存在着明显差异;生长高峰期到达的时间不同,白榆生长高峰期最长,其次为沙枣、胡杨、柽柳;4种树木耐盐程度不同,柽柳耐盐性最强,在总盐含量2.26%的情况下,尚能生长。  相似文献