A method for mapping the distribution of willow at a catchment scale using bi-seasonal SPOT5 imagery

This study showed that seasonal imagery acquired at specific stages of phenology can be used to improve the mapping accuracy of invasive willow at a catchment scale. SPOT5 XI (10 m) satellite imagery was acquired for early autumn and winter to represent the phenological stages of leaf cover and leaf fall respectively. Four classification regimes were evaluated using single‐ and bi‐seasonal composite imagery to determine the most accurate method. Significant spectral noise was found in willow populations, especially in the winter image, due to the effects of undergrowth exposure, shadowing, topography and boundary‐mixed pixels. Two noise reduction techniques were applied to the bi‐seasonal composite image to improve the classification results. The noise‐reduced bi‐seasonal composite image was classified using the spectral angle mapper (SAM) algorithm before importation into a geographical information system. Aerial photography was used to reduce the errors of commission associated with misclassification of pastures. The class accuracy achieved for willow using the method described in this study was 77.5% (Kappa =0.87). The high cost of eradicating willow means that managers must establish priorities for control; this technique can provide a powerful tool for prioritizing control programmes and for monitoring results at a catchment scale.     

Pseudomonas sp.20#-5防治烟草黑胫病田间试验初报

20^#-5菌株是本实验室从土壤中分离保存的1株假单胞菌,2006年对其发酵液防治烟草黑胫病进行了田间防效试验。结果显示,不同发病时期20^#-5菌发酵液的防治效果在64.39%～79.70%,高于对照药剂,防治效果较好。不同施药时期调查结果表明,发病前施用20^#-5菌发酵液的防治效果要好于发病后施用,说明20^#-5菌发酵液对烟草黑胫病具有有效的预防作用。     

昆虫病原线虫共生菌5-5B培养特性及杀虫活性研究

对一株昆虫病原线虫共生菌5-5B菌株的发酵条件进行的研究结果表明,最适温度为28℃,最适起始pH7.3～7.8,最佳振荡频率160r/min,250ml三角瓶内装液40ml,接菌量为4%。5-5B菌株发酵液对小菜蛾初孵幼虫的杀虫活性研究表明,250ml三角瓶内装液40ml时,校正死亡率为62.78%;接菌量4%时,校正死亡率63.84%;起始pH7.3时,校正死亡率65.49%。     

Nucleotide sequence homology to bovine viral diarrhea virus 2 (BVDV 2) in the 5′ untranslated region of BVDVs from cattle with mucosal disease or persistent infection in Japan

Cytopathogenic and non-cytopathogenic bovine viral diarrhea viruses (BVDVs) were isolated from cattle with mucosal disease or persistent infection in Japan. These isolates were compared for antigenic properties by cross-neutralization tests with Japanese reference strains of BVDV belonging to classical type 1. Significantly low cross-reactivity to reference strains was noted, indicating the viruses to possibly represent a new serotype in Japan. Thus, to determine the genotype of the isolates, nucleotide sequences of the 5′ untranslated region were determined and compared with those of previously reported BVDV 1 and 2. The isolates were clearly shown to belong to BVDV 2, not to BVDV 1.     

饲料添加剂双乙酸钠的5P营销策略

基于产品(product)、价格(price)、地点(place)和推广(promotion)等市场营销4P策略的内容,结合双乙酸钠的特征、应用和市场现状,整合融入营销平台(platform),即从4P策略过渡到5P策略,并对双乙酸钠市场营销的5P策略实施进行了分析与探讨.     

欠发达地区旅游业可持续发展技术路径选择研究

结合欠发达地区旅游业发展特点和经济学竞争优势相关理论认为,欠发达地区旅游业可持续发展通常遵循以下技术路径:即起步阶段充分发挥区域资源的绝对优势或比较优势,赢得起步发展空间;中期阶段充分利用后发优势,加速产业升级,实现跨跃式发展;成熟阶段加强资源整合,培育区域旅游业可持续发展的核心竞争优势。     

Hydrolab DS5X水质多功能监测仪器的验收评价

对Hydrolab DS5X水质多功能监测仪器对浊度、pH、溶解氧、电导率、叶绿素a、蓝绿藻探头的验收评价方法进行了摸索,对有推荐标准的测量参数按推荐标准进行了试验验收评价,对没有相关标准的测量参数从理论和日常使用角度给出了可靠的参考验收方法,结果表明,这种方法是可行的。     

葛根素提取工艺及其表征的研究

通过对野葛根中葛根素的分离提纯研究,发现溶剂的浓度对葛根素的收率及酸解过程中盐酸浓度对葛根素晶体纯度的影响均非常明显。为此,对这两个因素做进一步研究,结果表明：45%乙醇抽提时收率达2%;5%盐酸酸解时纯度达95.8%。并对提取物结构进行了1H NMR1、3C NMR、MS、IR表征。为进一步研究葛根素的应用奠定了基础。