兴安落叶松、樟子松苗木活力与水势的关系

通过对兴安落叶松、樟子松苗木活力与水势关系的分析，发现苗木活力与其水分状况密切相关，苗木失水首先使根系的水势下降，最终导致造林成活率和生长量的降低， 在苗木贮藏和运输过程中，有用保护剂是提高和保持苗木成活率的有效措施。     

预防樟子松插穗干旱的方法

樟子松采穗最佳季节为母树休眠期和7月10－7月15日。在母树枝条上环割生根率可提高30％；插穗切口采取“劈切”，其生根率可提高12．5％。地温控制在20－25℃；插壤水分管理标准是PF值2，空气相对温度控制在85％以上，插床遮荫度控制在70％为宜。     

科尔沁沙地针叶树造林技术研究

研究认为科尔沁沙地针对树育苗适于排水良好的沙质、中性或微酸性土壤，pH值为6．5－7．0，不超过7．5，粘重土质或pH值超过7．5都不适宜。圃地使用草炭或河泥改良土,针叶树苗期管理的重点是防治立枯病；留床切根育苗可提高苗木质量，降低育苗成本；提高针叶树造林成活率的关键是使苗木根系保持湿润，不被风干。采用容器苗造林可以提高造林成活率；幼树越冬，埋上防寒，可提高幼林保存率10％左右。引种针叶树，增加新造林树种，提高针叶树造林技术，改善樟子松林的生长状况，防治枯梢病等对加强科尔沁沙地造林具有重要意义。     

丝棉木嫁接北海道黄杨试验初报

利用丝棉木嫁接北海道黄杨,改变北海道黄杨在宁夏地区露地越冬易风干、抽干的现状,提高北海道生长量和增强抗寒、抗风干能力。采用同一砧木,嫁接时间不同、接穗采取部位不同,嫁接成活率、新梢生长量、茎粗有明显差异。试验结果表明：利用无分枝的接穗嫁接,成活率及生长量均大于分枝接穗。     

沙地云杉胚性愈伤组织诱导

沙地云杉(Picea mongolica)是内蒙古特有的珍稀树种,种子生产受到大小年、倒春寒及重齿小蠹等虫害的严重影响,有性繁殖受到阻碍。本研究以沙地云杉成熟胚为外植体进行胚性愈伤组织诱导,对影响胚性愈伤组织诱导的调控因子进行了研究。结果表明:(1)沙地云杉成熟胚接于培养基中培养,5 d后子叶和胚根部位膨大,10 d后胚根均明显愈伤化,40 d后愈伤呈水渍状,60 d后愈伤呈白色丝状;胚性愈伤的发生始于非胚性愈伤的表面,且长成的胚性愈伤呈细胞核大、细胞排列紧密的特点;研究结果明确了沙地云杉胚性愈伤形态学和细胞学的变化过程。(2)确定了沙地云杉胚性愈伤组织诱导的最适培养基和最佳激素组合。胚性愈伤诱导培养基为LM,激素组合为2,4-D 6 mg/L、6-BA 2 mg/L和KT 0.5 mg/L最佳培养条件为暗培养,且胚性愈伤诱导率46%。沙地云杉胚性愈伤诱导的成功可为沙地云杉资源的保护、开发、利用提供了理论依据和技术保障。     

华北半干旱区土壤养分和植被特征的小尺度空间异质性研究

A field experiment was conducted at Kezuohouqi County, Inner Mongolia Autonomous Region of China, which was located on the southeastern edge of the Horqin Sandy Land, to study the spatial variability of soil nutrients for a small-scale, nutrient-poor, sandy site in a semi-arid region of northern China; to investigate whether or not there were ＂islands of fertility＂ at the experimental site; and to determine the key nutrient elements that sustained ecosystem stability. Results obtained from geostatistical analysis indicated that the spatial distribution pattern of soil total nitrogen （STN） was far different from those of soil organic matter （SOM）, total phosphorus （STP）, and total potassium （STK）. Compared to SOM, STP, and STK, STN had a lower structural heterogeneity ratio and a longer range, while other elements were all similar. In addition, STN had an isotropic spatial structure, whereas the others had an anisotropic spatial structure. The spatial structure patterns of herbage species, cover, and height also differed, indicating that spatial variability was subjected to different ecological factors. Differences in the spatial variability patterns among soil nutrients and vegetation properties showed that soil nutrients for a small-scale were not the primary limiting factors that influenced herbage spatial distribution patterns. Incorporating spatial distribution patterns of tree species, namely, Pinus sylvestris var. mongolica Litv. and shrub Lespedeza bicolor Turcz. in a research plot and using fractal dimension, SOM, STP, and STK were shown to contribute to the ＂islands of fertility＂ phenomenon, however STN was not, possibly meaning that nitrogen was a key limiting element. Therefore, during restoration of similar ecosystems more attention should be given to soil nitrogen.     

东北核桃楸果仁营养强化型酸奶的研制

将东北核桃楸果仁经去皮、磨浆后,与牛奶混合,将干酪乳杆菌和嗜热链球茵以1：l混合作为发酵剂进行乳酸发酵,用L9（3^4）正交试验得出山核桃楸果仁酸奶的最佳配方：固液比1：6,浆奶比2：8,过80目筛。研制产品集山核桃、鲜奶及益生菌多种营养物质于一体、口感酸甜、带有核桃清香口味的乳制品,是一种具有较好的经济价值和市场开发潜力的功能性食品。     

A new belamcandaquinone from the seeds of Iris bungei Maxim

A novel dimeric 1,4-benzoquinone and resorcinol derivative, Belamcandaquinone N (1), and two known compounds, 3-hydroxyirisquinone (2) and 5-[(Z)-10-heptadecenyl] resorcinol (3), were isolated from the seeds of Iris bungei Maxim. Their structures were elucidated by spectroscopic methods and comparing with literature data of known compounds. These compounds showed remarkable cytotoxic activity against RM-1 cell lines.     

山桐子作为木本油料资源的开发潜力

通过对我国食用油安全隐患的深入分析,指出我国木本粮油资源开发的必要性与紧迫性,进而通过对山桐子作为木本粮油资源的优势分析(适应性强,产量大,含油率高,油质好,种植不占用耕地,兼具用材、景观和生态价值),阐述了山桐子作为木本粮油资源的巨大潜力,最后对山桐子的规模性开发提出了技术上和政策上的建议.     

沙地樟子松人工林冠下人工更新研究

在渐伐后郁闭度不足0.4的沙地樟子松人工林冠下进行人工更新试验,10年后观测各树种的生长状况,并对林下的土壤进行调查.结果表明:利用这种冠下人工更新方式使樟子松纯林转变为多树种混交的复层林;色木槭等4个树种可以作为冠下更新的主培树种;冠下人工更新可以逐渐改良土壤,延缓樟子松人工林林地土壤的衰退.