木质包装材料对溴甲烷和硫酰氟吸附的初步研究

在10℃和21.1℃条件下,松树和杨树对溴甲烷的吸附量大于柳树,杨树对硫酰氟的吸附量大于松树和柳树.随着温度的提高,3种木材对溴甲烷的吸附量减少;然而杨树对硫酰氟的吸附量在21.1℃条件下比10℃大.     

Length of cuttings in establishment and production of short-rotation plantations of Salix ‘Aquatica’

The effect of length of cuttings, 10 to 50 cm long, on establishment and productivity of short-rotation plantations was investigated in five trials, for periods of 2 to 9 years. The trials were established on abandoned agricultural fields planted with unrooted Salix Aquatica cuttings. The effect of cutting length was very similar in all five trials: the longer the cuttings (up to 30–50 cm), the better the survival and growth. In most trials the greatest difference in survival was between cutting lengths of 10 and 20 cm, especially in unfavorable growing conditions. In an annually harvested trial during the 9-year test period, a cutting length up to 30 cm affected biomass production per stool positively. In two trials grown with 5-year rotation, the longest cuttings produced 7 times the above-ground biomass of the shortest ones. Results of these trials also emphasize the importance of establishment for the future success of willow plantations.     

垂柳锈病的研究

垂柳锈病近年来在内蒙古地区垂柳（ＳａｌｉｘｂａｂｙｌｏｎｉｃａＬ．）上发生严重。经接种试验结果和形态特征观察,该病是由鞘锈状栅锈菌（ＭｅｌａｍｐｓｏｒａｃｏｌｅｏｓｐｏｒｉｏｉｄｅｓＤｉｅｔ．）为害所致。病原菌的性孢子、锈孢子（０、Ⅰ）阶段发生在紫堇（ＣｏｒｙｄａｌｉｓｂｕｎｇｅａｎａＴｕｒｃｚ．）上,夏孢子、冬孢子（Ⅱ、Ⅲ）阶段发生在垂柳上。首次发现紫堇是垂柳锈病菌的转主寄主。采用２５％粉锈宁８００倍液对垂柳锈病的防治效果较好。用２．４—Ｄ丁酯１０００倍液防治转主寄主紫堇效果较为理想。     

Willow stands as an alternative method for the reduction of leachate at contaminated sites — numerical investigations

The commonly used multiple‐liner‐system of modern top sealings of contaminated sites is expensive and in many cases (minor hazardousness of pollutants), not necessary. As an alternative, we investigated the performance of willow stands as the only measure to reduce percolating soil water and therewith pollutant transport to underlying ground water resources. It is well accepted that willows have a high water demand and may considerably reduce percolation. On the basis of experimentally determined soil physical properties of a landfill site, we performed water balance calculations with the physically based HYDRUS‐code and a simple bucket approach. The 20 yr annual leachate rate for bare soil was calculated to vary from 336 (HYDRUS) to 451 mm yr^—1 (bucket‐model). Willows were able to reduce the annual leachate to 146 (HYDRUS) and 186 mm yr^—1 (bucket‐model), indicating their great performance compared to a grass‐ or beechwood cover. However, legal regulations (TASi) in Germany cannot be met with the proposed method. In minor hazardous cases, official authorities may accept willow stands as an alternative system for protection.     

柳树不同无性系苗期数量性状的主成分分析

通过对31个柳树无性系5种数量性状的主成分分析,将柳树无性系划分为3个区,第一和第二区为密枝型,第三区为疏枝型,第二区株型较宽,第一区株型中等,第三区株型较窄。从而为柳树无性系进行田间试验及造林提供了依据。     

柳厚壁叶蜂生物学特性研究初报

柳厚壁叶蜂(Pontania dolichura)是严重危害柳树的一种害虫.调查结果表明,它在太原地区1年1代,以老熟幼虫在土中做茧过冬;翌年3月下旬化蛹,4月上旬为化蛹盛期,4月中旬成虫开始羽化,5月上旬为成虫羽化高峰期,成虫寿命10 d左右;成虫出土后,集中在柳树周围的花灌木上取食花蜜以补充营养.     

First report of Rhytisma filamentosum causing tar‐spot disease on Salix koriyanagi

The occurrence of previously unknown tar‐spot disease on Salix koriyanagi was observed during surveys for forest disease outbreaks in Korea. The fungus associated with tar‐spot disease was identified as Rhytisma filamentosum based on morphological characteristics of the fungus and molecular sequencing of the ITS and 28S rDNA regions of two samples. To our knowledge, this is the first report of R. filamentosum on S. koriyanagi from Korea, following its first discovery on Salix integra in Japan.     

NaCl处理对竹柳苗根系活力及抗氧化酶活性的影响

[目的]通过研究不同浓度NaCl胁迫对竹柳种苗根系活力、抗氧化酶活性的影响来评定其耐盐性,为竹柳向滩涂引种提供理论基础。[方法]对竹柳苗进行4个不同浓度下的NaCl处理,测定每个浓度下的根系活力与抗氧化酶的活性。[结果]随着NaCl浓度的升高,竹柳苗的根系活力先增大后减小。竹柳苗叶中的超氧化物歧化酶(SOD)、过氧化物酶(POD)活性都随着NaCl浓度的增加先增大后减小,当浓度超过0.5%时活性明显低于对照;叶片中丙二醛(MDA)含量先降低后升高。[结论]竹柳具有一定的耐盐性,有向滩涂引种的潜力。     

柳十八斑叶甲和柳二十斑叶甲的生物学特性及防治技术

简要报道了吉林地区 2 0 0 1年和 2 0 0 4年柳十八斑叶甲和柳二十斑叶甲发生的特点、危害时期、寄主范围及危害症状 ,并简单分析了这些害虫发生的原因和下一年的发生预测情况 ,介绍了这些害虫的常用防治方法。     

长江滩地5种杂交柳树纤维形态特征及其径向变异

研究5种不同无性系杂交柳树的纤维形态特征及其径向变异。结果表明：5种杂交柳树,纤维长度为884－1127μm,纤维宽度为18.63-23.42μm,双壁厚度为5.79-8.80μm,胞腔径为11.37-15.00μm,其沿径向均呈y=b0 b1x b2x^2分布。