江西自然保护区的排序研究

本文运用主量分析的方法，分析了江西森林自然保护区的自然属性与地理分布的规律，旨在从中找到一组可靠的自然属性，以此预测建立森林自然保护区的合适之地，并对已建立的５个省级自然保护区进行分布合理性分析。研究表明：前３维主分量的信息量占总信息量的８７．７３％，降维效果良好。通过对不同自然属性在前３维主分量上的负荷量以及它们这间的离散性分析，确定了１２个自然属性是诗人和预测自然保护区的有效因子。从而证明ＰＣＡ在自然保护区的规划和研究中具有良好的适应性。     

Detecting forest landcape boundary between Mountain Birch and evergreen eoniferous forest in the northern slope of Changbai Mountain

Boundaries between different forest types in Changbai Mountain Eatern China are results from complex interactions between forest ecosystems,topogrphy,and geomorphology.Detecting and quantifying the transitional zones are highly important since high environmental beterogeneity and biodiversity are ofter found within these zpmes.In this study,we used GIS and multivariate statistics techniques(PCA and MSWA) to analyze data from Landsat TM satellite imageries and quantitatively determined the positions and widths of the landscape boundary betweeen mountain birch and evergreen coniferous forests in the northern slope of Changbai Mountain.The results showed that the widths of the landscape boundary ranges from 30-50 m while using the MWW A or/and PC method.Such detected widths are consistent with field transect data that suggest a 50m tranistional zone width.The results further suggest that TM data can be used in combination with GIS and statistical techniques in determining forest landscape boundaries.MSWA is more reliable than PCA,while PCA can also be used to determine the landscape boundary when transects are properly located.     

大兴安岭地区雷击火分析与防治

1 雷击火已成为引发我区森林火灾的主要原因之一 大兴安岭地区地处高纬，受气候和地形的影响，每年4～7月都有雷击闪电发生。来自极地大陆性冷气团或变形的冷气团。通过大兴安岭林区易产生雷暴天气，引发雷击火出现。实践证明，大兴安岭林区是雷击多发区，雷击火已引发多起重特大森林火灾。内蒙大兴安岭地区的雷击火占该区总火源的18％，最多年份可达38％。喜桂图旗、鄂伦春旗和额尔古纳左旗等地的雷击火，在有的年份可占这些地区总火灾的76％。     

热带假丝酵母8953菌株对苯酚的降解特性研究

实验室分离的一株热带假丝酵母(编号为8953)具有较强的苯酚降解能力,并可以利用苯酚、间苯二酚、联苯胺等芳烃为唯一碳源和能源生长。该菌株在48h内可完全降解约14.88mmol/L苯酚,完全降解10.63mmol/L苯酚只需要24h,其降解苯酚浓度最高可达19.13mmol/L。在pH4～9,温度20℃～40℃范围内,苯酚浓度为10.0mmol/L条件下该菌株均保持100%的降解率。该菌株降解苯酚的最适pH范围为6.0～8.0,最适温度范围为28℃～30℃,最佳接种量为1%～3%,外源添加氮源能促进酵母生长和苯酚的降解。