野生盾叶秋海棠引种驯化及应用研究

1997～2001年，采集西畴、麻栗坡野生盾叶秋海棠，引种至昆明市植物园温室区，通过物候观察，繁殖，生态适应性试验，证明引种的盾叶秋海棠生长健壮，正常开花结实，繁殖后代，可用于室内观赏或作为林下地被。     

外加剂混凝土耐久性的试验研究

本文针对掺加不同外加剂的混凝土的含气量、抗冻性能、抗压强度、抗折强度等方面的试验研究，提出掺入外加剂是提高水泥混凝土路面耐久性的必要措施。     

淳化县泥河沟流域果林发展与综合效益遥感动态研究

利用不同时期遥感信息资源、结合实地调查测绘，编制不同时期果林类型图，经过叠合比较，建立动态分类系统，获得果林类型动态图，以此分析淳化县泥河沟流域１９８６￣１９９５年果林面积的动态变化与综合效益。     

Mangrove Habitat Formation and Response to Holocene Sea-level Changes on Kosrae Island,Micronesia

Mangrove habitats on Kosrae are divided into three types, i.e., an estuary or delta type, a backmarsh or lagoon type and a coral reef or tidal-flat type. Most of the mangrove forests of Kosrae have been developed during the last 2000 years by accumulating mangrove peat with the gradual sea-level rise of 1 to 2 mm/yr except the landward part of the estuary or delta type. On the other hand, during the period of rapid sea-level rise of about 10 mm/yr between 4100 and 3700 yr B.P., the mangrove forests ceased peat accumulation and retreated landward. Until 3500 yr B.P., mangrove forests were distributed only in narrow bands in the inlets. Therefore, the critical rate of mangrove peat accretion with sea-level rise is estimated at more than 2 mm/yr and less than 10 mm/yr. If the anticipated sea-level rise exceeds this critical rate, all of the mangrove forests of Kosrae will retreat landward and reduce rapidly.     

Sur un cas de variabilité chez Sphaeropsis sapinea

A case of variability in Sphaero sis sapinea . Two isolates (type I and type II) of Sphaeropsis sqinea were isolated from the co lar of a declining Cedrus deo daa in the South of France. Cultural characteristics on PDA and MEA as well as conidial dimensions were compared with those of types A and B of S. sapinea described to occur in North America. Type II was similar to type A in respect to cultural aspects and growth but distinctly different in conidial dimensions. Slower growing type I was similar to type B. However, type I grew faster on PDA, had smaller conidia and lacked microconidia. Single-conidia isolates obtained from the four types showed stability of these characteristics.     

河南省林种结构调整的研究

根据１９９３年省森林资源清查、森林资源消耗量及消耗结构的调查资料，以可持续发展的理论为指导，采用线性规划对我省的林种结构进行了研究。研究结果：河南省现阶段的林种结构应为：用材林∶防护林∶经济林∶薪炭林∶特用林＝３４９∶１５９∶２３７∶２１１∶４４。     

Tree size dependence of litter production, and above-ground net production in a young Hinoki (Chamaecyparis obtusa) stand

The study was carried out in a 9-year-old hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.), stand over a span of three years from July 1992 to June 1995, primarily to predict litter production from exteral tree dimensions by combining open-top clothtrap and clipping methods. Litter production was virtually concentrated in October and November. Stem cross-sectional area at the crown base was proved to be the reliable predictor of litter production, and that single regression model was evolved irrespective of year. The regression model had proportional constants of 2.696 × 10⁻² and 3.540 × 10⁻² kg cm⁻² year⁻¹ for leaf litter and total litter production, respectively. Utilizing the model, leaf litter production of the stand was assessed to be 5.04, 5.12, and 4.99, and total litter production to be 6.48, 6.58, and 6.40 Mg ha⁻¹ year⁻¹ for the first, second and third year, respectively. Biomass increment was 6.67, 7.80, and 7.70, tree mortality was 0.15, 0.13, and 0.41, and insect grazing was 0.09, 0.05, and 0.002 Mg ha⁻¹ year⁻¹ for the first, second and third year, respectively. Above-groud net production was therefore 13.39, 14.55, and 14.51, Mg ha⁻¹ year⁻¹, and biomass accumulation ratio (biomass/net production) was 1.86, 2.21, and 2.76 year for the first, second and third year, respectively. Considering data from earlier studies and the results of this study, biomass accumulation ratio,BAR (year), of hinoki stands was best related to above-ground biomass,y (Mg ha⁻¹), using the power function:BAR=0.112y ^0.936. Excluding seedling stands, leaf efficiency (above-ground net production per unit leaf mass) of hinoki stands was 0.91±0.02 (SE) Mg Mg⁻¹ year⁻¹, irrespective of stand biomass or age.     

Sensitivity study of the finite element model for wood-framed shear walls

A sensitivity study was performed with a nonlinear elastic finite element model for monotonie analyses of wood-framed shear walls. The objective was to provide information about simplifying a model of wood-framed shear walls with no significant loss in accuracy. The simplifications concern features such as slips in joints between frame members, slips in hold-down connections, and bearing between adjacent sheathing panels. The results from analyses of a shear wall with an opening of window shape show that the effect of constraint by the bearing between sheathing panels and slips in frame joints on the overall stiffness of the wall is limited. Thus, there are great possibilities for reducing the calculation time by not taking these phenomena into account, avoiding an excessive number of degrees of freedom and iterations. The influence of the simplifications on the distribution of vertical reaction forces along the wall is more significant. Furthermore, if each simplification is introduced separately, the effect on the overall stiffness is greater. The difference, however, is less than 10%. The failing pattern of the nail connections is also clearly influenced by the simplifications when they are introduced separately. The results from the analyses show that slips in frame joints can be sufficiently represented by those in connection with the opening.     

竹筋陈材与新伐材主要物理力学性质的比较研究

以３５年前的毛竹为研究对象，并以经气干的同龄、同径的新伐毛竹材作为对照，根据国际规定及相关试验方法，对两类试材在完全相同的实验条件下进行物理性质、力学性能、化学成份等的测定和对比分析，结果表明，影响竹材使用寿命的主要因素是水分的侵蚀和虫害，载荷作用的时间长短及性质对它的影响轻微，因此，在加工、保管和使用竹材的过程中要十分重视防水、防潮和防虫，保持竹材尺寸稳定，达到提高耐久性的目的。     

害虫病原真菌的研究方法

详细介绍了害虫病原真菌的研究方法，包括病死虫体的收集、处理、保存；病原真菌的分离、提纯；病原真菌致病性的试验、优良菌株的筛选；病原真菌的鉴定、复壮、贮藏等。