Antioxidant flavanes from Livistona chinensis

Three new flavanes and eight known flavonoids were isolated from the fruits of Livistona chinensis. The structure of the new flavanes were established as 2S,3S-3,5,7,3′,5′-pentahydroxyflavane (1), 2R,3R-3,5,6,7,8,4′-hexahydroxyflavane (2) and 2R,3R-3,5,6,7,8,3′,5′-heptahydroxyflavane (3), respectively, on the basis of chemical and spectroscopic data. The antiproliferative activity against four human tumor cell lines (HL-60, Mata, HepG2 and CNE-1) was evaluated. 1 had significantly antiproliferative effects against HL-60 and CNE-1 with the IC₅₀ of 0.2 ± 0.01 and 1.0 ± 0.1 μM, respectively, overpowering the reference compound in the assay (cisplatin). Most compounds also exhibited potent antioxidant activity.     

Two new amide alkaloids with anti-leukaemia activities from Aconitum taipeicum

Two new amide alkaloids, named 3-isopropyl-tetrahydropyrrolo [1,2-a] pyrimidine-2,4(1H,3H)-dione (1) and 1-acetyl-2,3,6-triisopropyl-tetrahydropyrimidin-4(1H)-one (2), were isolated from the roots of Aconitum taipeicum. Their chemical structures were characterized on the basis of MS, 1D- and 2D NMR. The anti-leukaemia activities of the compounds were also tested. The results indicated that the compounds exhibited more significant cell growth inhibitory activities against HL-60 cells than adriamycin, with the IC₅₀ of 1.1 ± 0.03 μg/mL and 1.6 ± 0.07 μg/mL respectively. In addition, two compounds showed anti-tumor activities against K562 cells as well.     

Four new phenanthrenes from Monomeria barbata Lindl

Three biphenanthrene compounds (1–3) and a triphenanthrene compound (4), together with six known biphenanthrene compounds (5–10), were isolated from the tubers of Monomeria barbata Lindl. Their structures were elucidated on the basis of extensive spectroscopic analysis (1D-, 2D-NMR, and HR-ESI-MS). These four new compounds were tested in vitro for the cytotoxic activity against liver carcinoma (HepG-2), promyelocytic leukaemia (HL60), ovarian carcinoma (Skov-3) and epidermoid carcinoma (A431) cancer cell lines and the antioxidant activity in DPPH radical scavenging. Compounds 1–4 exhibited significant cytotoxic activity against HepG-2 and HL60 cell lines, and potent antioxidant activity in DPPH radical scavenging.     

嫩江沙地不同立地造林树种选择研究

本文从当前嫩江沙地树种混杂 ,造林效果不佳 ,急需适生树种的实际出发 ,开展了沙地适生灌木和杨、柳树种选择试验 ,初步筛选出了几个适生乔、灌木树种。     

湿地松、火炬松扦插繁殖技术研究*

对影响湿地松、火炬松扦插生根的基质、生根剂及浓度、插穗状况、扦插季节、扦插方式 、扦插后管理等因子进行了研究。较佳的扦插技术组合为：用砂性土作基质，在冬季或早春采集当年生半木质化的基部萌条，湿地松用生根剂１号低浓度，火炬松用生根剂１号或２号中等浓度浸泡１５ｈ，插后保温保湿并定期喷洒营养液，生根率可达９５％以上，温室扦插苗在５月上旬以前移入大田，当年生扦插苗高达３３－４４ｃｍ，主侧根发达，可出圈造林     

应用遥感数据识别意大利沿海松林灾害级别

分析了LandsatTM和ERS-1SAR数据用于识别意大利沿海松林污染灾害级别的潜在能力，结果显示出夏季获取的TM数据在森林灾害制图上远比冬季获取的TM数据和SAR影像有效，但SAR影像的贡献也是不可忽略的，文中给出了应用人工神经元网络B-P模型得到的对意大利沿海松林污染灾害级别划分的结果和应用FINDKAPP程序得到的精度评价结果。     

西藏灌木林空间分布影响因素分析

以西藏主要类型灌木林为研究对象,基于全区2002年森林资源分布图,分析了影响西藏各主要类型灌木林空间分布的主要环境因子,提取了包括经度、纬度、海拔、坡向、坡位和坡度等6个环境因子的数据,并对数据进行梯度划分,应用多重对应分析方法,定量研究了环境因子对西藏各主要类型灌木林空间分布的影响程度,并进行了影响因子排序。研究结果表明,总体上看,西藏主要类型灌木林的空间分布均在不同程度上受大尺度环境因子的影响,主要表现在经纬度和海拔上;在小尺度上,各环境因子通常表现为共同影响灌木林的分布。     

国家级森林资源清查的发展趋势

阐述了国外国家级森林资源清查发展趋势的４个主要特点：清查项目和内容的增加；监测的跨部门一体化和信息共享；全球森林资源监测和评价需求；新技术的不断采用。并针对我国森林资源监测体系的现状，论述了在原ＣＦＩ体系基础上建立新的国家级监测体系的必要性。     

朝阳清风岭省级自然保护区范围及功能区调整分析

为了使朝阳清风岭省级自然保护区范围及区划更加科学合理,对自然保护区的调整原则、调整理由、调整必要性等方面进行了研究,提出了调整方案,并对保护区调整后的适宜性进行了评价,以期提高管理效率和保护效益、推进保护区可持续发展。