天台国清寺景区马尾松枯死的初步研究

经调查结果表明，天台县国清寺景区马尾松枯死的原因是，林分密度大、树种单一、松树生长衰弱、松墨天牛危害严重引起松树大量流脂导致逐渐枯死，但尚未发现松材线虫病危害。加强抚育管理，调整林分结构，培植阔叶树种，逐渐形成混交林，是国清寺景区风景林的发展方向。     

烟草赤星病不同菌株致病力差异的研究

本试验研究结果表明：采用离体叶片鉴定品种抗病性时点滴法优于喷雾法．从来源不同的１１个烟草赤星病菌株中筛选出致病力最强的Ａ４菌株，鉴别出几个烟草品种抗病性由强到弱的顺位为净叶黄＞晒烟９号＞风林一号＞Ｇ８０＞Ｎｃ８９＞Ｋ３２６．提出了烟草赤星病菌存在生理小种的可能性     

尼泊尔安纳布尔纳保护区建设的启示

尼泊尔安纳布尔纳保护区的建设简单朴实,尽可能地减少了对环境的破坏,原汁原味的自然和人文景观吸引了越来越多的旅游徒步者。借鉴其保护方法,我国风景名胜区还应在立法、管理体制和规划上更加完善。     

Kalmia removal increases nutrient supply and growth of black spruce seedlings: An effect fertilizer cannot emulate

In Canada's eastern boreal forest, the stagnant growth of black spruce (Picea mariana (Mill.) BSP) seedlings is often observed in the presence of ericaceous shrubs such as Kalmia angustifolia L. Many mechanisms, including allelopathic interference, reduced soil N mineralization, soil enzymes inhibition, and direct resource competition have been proposed to explain poor spruce growth in the presence of Kalmia. However, the relative importance of direct competition versus indirect interference remains unclear. Our objective was thus to adequately isolate the “Kalmia effect” from other growth-limiting factors and to determine if removal of Kalmia also resulted in fundamental changes in the biochemical properties of the forest floor. By sampling plots established in 2000, we evaluated how Kalmia eradication and spot fertilization influenced soil nutrient availability, N mineralization rates, microbial basal respiration and biomass, as well as planted black spruce seedling growth, dimensions, and foliar nutrient concentrations 6 years later. We measured higher extractable-P, mineralizable-N, seedling dimensions and growth rates, as well as lower extractable-K, total-K, basal respiration and microbial biomass, in plots without Kalmia than in those where Kalmia had been maintained from 2000 to 2006. Our results thus confirmed that Kalmia eradication over 6 years not only improved the growth and nutrition of black spruce seedlings, but also resulted in fundamental changes in the biochemical properties of the forest floor. We demonstrated that along with direct competition for resources, Kalmia interferes indirectly with black spruce by modifying nutrient cycling and energy fluxes in soil. Higher indices of available C in plots with Kalmia corroborates that Kalmia tannins or rhizodeposition may reduce N mineralization by stimulating microbial immobilization, a relation that however needs to be confirmed with longer term laboratory incubations. Our results indicated that although it had a positive influence on seedling growth, the fertilization effect was confined to the first few years following treatment application, and failed to influence soil processes as did Kalmia eradication. Further monitoring will indicate if the increased litterfall in fertilized plots will eventually initiate a second wave of fertilizer-induced changes to soil processes, as observed in other ecosystems.     

毕棚沟风景区红叶彩林景观稳定性分析

以森林资源规划设计调查数据为数据源,定量分析毕棚沟风景区红叶彩林景观格局并运用能更加综合便捷地描述景观稳定性的主成分分析法构建研究区森林景观稳定性评价模型。研究表明:(1)风景区内主要红叶彩林景观类型有鲜卑花林、杜鹃林、四川落叶松林、高山柳林及忍冬林景观。(2)景观稳定性指标中最大斑块指数、斑块所占景观面积比例及斑块内聚力指数对研究区彩林景观类型稳定性影响程度较大。(3)鲜卑花林、杜鹃林、四川落叶松林及忍冬林的景观稳定性较高,花楸林、沙棘林、桦木林及杨树林的景观稳定性低。低稳定性景观类型宜采取改造低价值林分、抚育彩林、构建生态廊道等措施。研究为风景区森林旅游的可持续发展规划提供参考。     

利用离体技术鉴定小麦根腐病抗性研究

通过不同处理的离体试验及田间对比试验,对离体鉴定技术应用于小麦抗叶部根腐病(H.sativum)育种的可行性进行了较深入的研究,试验证明：应用离体技术鉴定小麦叶部根腐病抗性结果准确、速度快,而且不受环境条件限制。同时,采用离体鉴定的方法对参试的2632份材料进行抗性评价,从中筛选出8份高抗和60份中抗的材料,其中17分来自人工合成六倍体小麦,51份来自普通小麦。     

闽江口景观资源评价研究

闽江口是中国最具景观多样性的河口地区之一,山海川岛的地貌特征,深厚的历史文化底蕴,良好的生态环境,充满活力的现代产业景观以及别具一格的侨乡风貌构成了一幅绚丽多彩的风景画。本文采用VRM系统对闽江口的景观视觉质量进行了评价,十个景观质量评价单元中有九个属A级,一个属B级,可见闽江口地区的景观质量是非常高的。     

旅游干扰对二龙山风景区土壤和植被的影响

为了揭示旅游干扰对风景区环境的影响,在二龙山的最高山白石砬子山的山顶、山腰及山前台地各处取几组旅游影响较小和旅游影响较大的样地进行土壤和植被对比分析,又对白石砬子山和旅游区后山的植被从整体上进行对比分析。结果表明,旅游干扰对土壤和植被都有影响,表现为土壤容重、pH值增加,土壤含水量、孔隙度、有机质、N、P及土壤黏粒含量减小;严重旅游干扰使群落中植物的个体数量减少,种类组成趋于简单,多样性指数和均匀度指数降低,优势度指数增加;植物群落中受旅游干扰影响较大的是草本层和灌木层,乔木层受到的影响较小。     

郑州黄河风景名胜区文化景观认知与保护研究

郑州黄河风景名胜区经历长期的发展演变,形成具有中原特色的黄河文化,但目前对于其景观资源的认知模式仍以资源导向型为主,忽略了人与自然持续演进过程中产生的文化价值。因此,基于文化景观的视角,通过研究郑州黄河风景区文化价值层积的演变特征,剖析其文化景观物质表象与精神内涵的构成要素,解读其文化景观价值,并提出相应的保护与发展策略,以实现文化景观的可持续发展。     

增城区白水寨景区红花荷群落特征

基于样方调查,结合区系分析、重要值分析和物种多样性分析方法对白水寨景区红花荷(Rhodoleia championii)群落特征进行研究.结果显示,在1500 m2的样方中,共记录维管束植物65种,隶属于38科55属,植物区系以热带亚热带分布为主;群落层次可分为乔木层、灌木层和草本层,乔木层作为主要构成层次,物种最为丰富;红花荷在群落中处于主导地位,种质资源保存完好.