木麻黄苗期施肥和密度的田间试验

在田间按正交设计方案，进行木麻黄苗期氮、磷、钾施肥试验，并安排了木麻黄苗木五种不同密度试验，结果表明：合理配施氮、磷、钾肥能提高苗木生长量，最佳施肥组合为氮３００ｋｇ／ｈｍ２、磷９００ｋｇ／ｈｍ２、钾１５０ｋｇ／ｈｍ２；适当增大苗木株行距有利于苗高、地径的生长；在一定密度限度（１５００００株／ｈｍ２）下，苗木生物量随密度提高而增加。     

竹笋象危害对竹材物理力学性质的影响

对受笋万纹象(Otidognathus rubriceps Chevrolot)、一字竹笋象(O.davidis Fairmaire)、大竹笋象(Cyrtatrachelus longimanus Fabricius)危害后断梢毛竹、竹腔注药防治后毛竹、正常毛竹3种竹材进行竹材抗弯强度、抗弯弹性模量和顺纹抗拉强度测定结果表明,与正常毛竹相比较,受竹笋象危害断梢毛竹差异显著,3个竹材物理力学性质指标分别下降了43.79%、39.01%、29.28%,竹腔注药防治后毛竹3个指标下降了13.87%、10.95%、9.01%,但差异不显著,不影响竹材的使用价值.     

旅游解说牌示规划设计方法与技术探讨

针对目前我国旅游景区管理人员对旅游解说牌示的价值、规划方法与技术认识不深的现实,在旅游解说规划中充分体现人本主义的思想下,结合景区旅游解说资源的特性与游客特征,分析出旅游解说牌示规划与设计应包括规划阶段、设计阶段、建造阶段、评估与保持等4个阶段和组建解说队伍、清查解说资源、决定解说目标、选择牌示类型、选择牌示材料、连接对象与文本、确定牌示文本、确定牌示尺度、选择印刷方式、评估解说牌示与保持解说牌示等11个具体步骤.     

利用Parks模型评估扑火费用的合理性

如何以最少的投入扑灭火灾,把火灾损失降至最低限,是非常关键的。对每次火灾后的扑火费用计算和评估有利于指导和优化今后的扑火工作。本文利用parks数学优化模型对相关参数进行了计算并在设定条件下对计算结果作了比较。     

Density dependence on tree survival in an old-growth temperate forest in northeastern China

? Density dependence is a major mechanism for shaping plant communities. However, its role in regulating diverse, mixed natural tree communities is less certain.

? In this study we investigated density-dependent effects in a large-scale (25 ha) old-growth temperate forest in northeastern China. Spatial patterns of neighborhood distribution in the plot were analyzed using various methods for inferring competition, including (1) pair correlation function to determine spatial patterns of pre-mortality and post-mortality and (2) neighborhood analysis of individuals to examine the extent to which tree survival is correlated with other covariates.

? Results showed that, for common species, 3 of 5 canopy species and 3 of 8 midstory and understory species were random in mortality. Negative density-dependent mortality was not found when trees reach 1 cm in DBH. There was no significant correlation for canopy species between tree survival and conspecific abundance, but largely positive correlations for midstory and understory species. In contrast, tree survival was found to negatively correlate with conspecific basal area for most species, indicating strong intraspecific competition. No strong interspecific density dependence was found in the forest.

     

塑料大棚对油松,侧柏容器苗生长的影响

70年代以来,塑料大棚容器育苗技术(以下简称大棚技术)在我国有了较快的发展,与常规育苗相比,它具有出苗早、造林成活率高等优点。目前对大棚容器育苗技术的研究,多集中于培养基质、容器类型、规格等方面,但对大棚条件下,环境变化与苗木生     

Callus formation and cucurbitacin B accumulation in Ecballium elaterium callus cultures

Ecballium elaterium fruit juice is used for the treatment of sinusitis in Turkish folk medicine. The aim of this study was to increase the yield of cucurbitacin B, an anti-inflammatory compound previously isolated in various organs of E. elaterium, through tissue culture techniques. Higher yields of cucurbitacin B (1.126%) were obtained from the first subculture calluses from stem nodes in the presence of benzyl adenine (BA; 1 mg/l) and naphtalene acetic acid (NAA; 0.1 mg/l) in comparison with the yields obtained from plant material (0.01%).     

嫩江沙地杨树用材林生产力的研究

通过对嫩江沙地杜蒙和讷河2个区域12个杨树样地标准木调查资料的分析,确定了几种杨树的地上净生产力范围;通过对生物量和生产力构成因素的综合分析初步确定了杨树合理的经营密度,表明林分密度应根据不同的造林目的和立地条件实行动态管理.     

全球化与中国景观文化

随着“城市化”的提速。“全球化”的到来，我们正面临着：1、“经济”与“文化”的矛盾；2、“现代”与“传统”的矛盾；3、“外来文化”与“本土文化”的矛盾。     

福建滨海沙地造林树种的适应性与选择研究

对不同树种滨海沙地适生性进行测定 ,不仅可以筛选出适宜于在不同滨海沙地的树种 ,丰富滨海防护林的树种资源 ,同时 ,也是防护林生态系统管理的要求。本文通过对各树种在不同滨海沙地立地上的成活率 (或保存率 )、生长量和抗风性的比较 ,筛选出适宜在福建东南滨海后沿沙地上栽植的树种有巨尾桉、刚果1 2 #桉、厚荚相思、纹荚相思和马占相思等 5个树种 ;较适宜的树种有山地木麻黄、柠檬桉、大叶相思、湿地松等 1 0个树种 ;适宜于木麻黄基干林带更新改造的树种有木麻黄无性系 70 1 #、60 1 #、厚荚相思等 3个树种 ,较适宜的树种为刚果 1 2 #桉 ,但建议慎重使用 ;适宜于前沿有少量稀疏木麻黄老林带保护的风口沙地立地上造林的树种有厚荚相思 ,较适宜的树种有纹荚相思和马占相思等 2个树种 ;适宜于滨海风口沙地立地上造林的树种有木麻黄惠安 1号无性系和木麻黄澳大利亚种源C3 8,具有一定潜力但尚需做进一步观察的树种有短枝木麻黄、木麻黄澳大利亚 1 5 1 98种源、木麻黄无性系 70 1 #和细枝木麻黄。