GIS在林业专题制图中的应用

论述了运用于理信息系统软件完成应用遥感技术进行思茅地区样地清查及进行“二项调查”的制衅工作，重点阐明了整个制作过程、成果分析、该注意的几点事项。成果得到相关部门的认可，该方法可应用于林业专题图的制作。     

New constituents from Gliricidia sepium

The heart wood of Gliricidia sepium stem yielded stigmastanol glucoside (1) and 3',4'-dihydroxy-trans-cinnamic acid octacosylester 2, along with three other known constituents.     

Configuration and development of root systems of cuttings and seedlings of Eucalyptus globulus

Stem cuttings of Eucalyptus globulus are used within tree improvement programs and for mass deployment. To be successful, cuttings must perform as well or better than seedlings. The root systems of cuttings are fundamentally different from those of seedlings. If these differences influence growth, the differences and their consequences must be identified and the propagation system manipulated to improve performance of the propagules.Cuttings are only a viable alternative to seedlings as planting stock if the method of propagation does not affect their growth and development adversely. Full-sibling cuttings and seedlings of Eucalyptus globulus were compared under controlled environmental conditions to minimise extraneous sources of variation, and to establish whether changes in growth or development were induced by propagation. On three occasions over a period of eight weeks root-collar diameter, shoot height, leaf and stem weight, shoot/root ratios and root system morphology were measured on cuttings and seedlings. Seedlings were taller than cuttings throughout the experiment, but both plant types had similar height growth rates. Diameter growth rates were lower in cuttings than seedlings, and there were differences in both height and diameter growth rates between families. Root system configuration differed between the plant types. Seedlings had strongly gravitropic tap-roots, with two types of primary roots from which secondary roots emerged. Cuttings had no tap roots, and the main structural components of their root systems were adventitious roots formed during propagation. Cuttings did not develop further structural roots during the experiment, whereas seedlings continued to develop primary roots. Individual primary roots of cuttings were longer and had larger mid-point diameters than those of seedlings, but the total length of primary roots was greater in seedlings. Seedlings also had a greater number and total length of secondary roots. Shoot/root ratios, calculated from a range of functional measures, were higher in cuttings than seedlings.     

Simple method for synthesizing phenolicβ-O-4 dilignols

A modified synthetic method for phenolic-O-4 lignin substructure model dimers was developed involving protection of the phenolic hydroxyl group of acetophenons with benzoyl chloride, bromination with 4-dimethylaminopyridiniumbromide perbromide, condensation with phenols in the presence of 18-crown-6-ether, condensation with paraformaldehyde, reduction with NaBH₄ and debenzoylation. This method results in shorter reaction times and increasing yields without the application of strict anhydrous and drastic conditions or chloric solvents. This alternative route could be applied to the-O-4 dilignol syntheses of four combinations of guaiacyl and syringyl derivatives.     

蛭石与人造沸石氨氮等温吸附理论式与判别式

为比较在高起始氨氮浓度C0点和介质用量W0点上,吸附理论通式Qe=W0qmC0/[qmKw W0(qm-qe) C0]与其简化方程Qe=W0qmC0/[qm(Kw W0) C0]的适用性,测定了给定pH值和温度条件下反应平衡时NH4Cl溶液中蛭石和人造沸石的氨氮吸附量(Qe).在该试验条件下确定的蛭石单位介质吸附容量qm和介质系数Kw值分别为22 mg/g和15.5 g/L,人造沸石的qm和Kw的值分别为45 mg/g和8 g/L.在整个试验氨氮浓度C0和介质用量W0范围内,用该通式描述两介质刘氨氮的等温吸附过程具有很高的精确度.而简化方程仅在有限范围内即C0相对小或W0相对大时才适用.若给定预测相对误差(RD),则C0/qm(Kw W0)≤RD可作为简化方程应用的判别式.     

我国麦/稻秸秆板工业的发展与思考

通过回顾我国秸秆板工业化生产的发展历程及现状,分析了目前秸秆板生产设备与工艺存在的问题和差距,从多个方面就我国今后秸秆人造板发展有待改进的方向提出建议.     

A mangrove stand under sewage pollution stress: Red Sea

A mangrove stand of Avicennia marina located at the South Corniche of Jeddah city receives about 100 000 m³ of sewage per day. The sewage has high values of BOD, COD, nutrient concentrations, heavy metals and faecal coliform counts.The mangrove stand is very small and occupies an area of about 0.45 km². The trees are stunted with low pneumatophore density. The pneumatophore distribution is restricted to the area of substrate underneath the plant crown covers and they do not look healthy. A high proportion of them was observed to be dead and/or aberrant. These abnormal induced features were attributed to the sewage discharge in the area. The death of pneumatophores decreases the aeration area which apparently affects the respiration rate of the root system, nutrient uptake and plant growth, consequently leading to a retarded growth of the mangroves.     

异冰片基氧丙酮及4－异冰片基氧－2－丁酮的合成

将莰烯分别与１，２－丙二醇及１，３－丁二醇加成所得产物１－［（１，７，７－三甲基双环［２，２，１］庚－２－基）氧］２－丙醇及４－［（１，７，７－三甲基双环［２，２，１］庚－２－基）氧］－２－丁醇，氧化得到两只新型的可用作香料的萜醚酮，１－［（１，７，７－三甲基双环［２，２，１］庚－２－基）氧］丙酮，与４－［（１，７，７－三甲基双环［２，２，１］庚－２－基）氧］－２－丁酮。