区域旅游资源开发定位研究——以内蒙古赤峰市为例

区域旅游资源开发是发展区域旅游的基础 ,开发的定位研究有助于为一地旅游业的发展指明方向。本文从区域角度和空间经济一体化思想出发 ,以赤峰市为例 ,通过对旅游资源的定量与定性研究 ,得到旅游资源的综合评价图式 ,结合区际分析归纳出赤峰市旅游资源开发利用的方向和层次。从而为区域旅游开发的定位研究进行了一般理论的探讨及例证分析     

松口蘑的研究热点

揭开松口蘑与松科植物的共生关系，开发松口蘑的人工栽培技术已成为国际性的松口蘑研究课题。近年来，日本、瑞典、美国、韩国和新西兰等国的研究人员为鉴别松口蘑及其近缘种提供了有效的分子生物学手段，从形态解剖学、生理学上验证了松口蘑是典型的外生菌根菌的理论，同时也提出了松口蘑-宿主是一个动态的共生关系。松口蘑快速人工菌根的合成体系已经建立，为松口蘑人工子实体的诱导奠定了不可缺少的基础。这一领域的研究必将与植物学、菌物学和土壤学的研究紧密地结合起来，以共同开发松口蘑的人工栽培技术。     

Characterizing historical and modern fire regimes in Michigan (USA): A landscape ecosystem approach

We studied the relationships of landscape ecosystems to historical and contemporary fire regimes across 4.3 million hectares in northern lower Michigan (USA). Changes in fire regimes were documented by comparing historical fire rotations in different landscape ecosystems to those occurring between 1985 and 2000. Previously published data and a synthesis of the literature were used to identify six forest-replacement fire regime categories with fire rotations ranging from very short (<100 years) to very long (>1,000 years). We derived spatially-explicit estimates of the susceptibility of landscape ecosystems to fire disturbance using Landtype Association maps as initial units of investigation. Each Landtype Association polygon was assigned to a fire regime category based on associations of ecological factors known to influence fire regimes. Spatial statistics were used to interpolate fire points recorded by the General Land Office. Historical fire rotations were determined by calculating the area burned for each category of fire regime and dividing this area by fifteen (years) to estimate area burned per annum. Modern fire rotations were estimated using data on fire location and size obtained from federal and state agencies. Landtype Associations networked into fire regime categories exhibited differences in both historical and modern fire rotations. Historical rotations varied by 23-fold across all fire rotation categories, and modern forest fire rotations by 13-fold. Modern fire rotations were an order of magnitude longer than historical rotations. The magnitude of these changes has important implications for forest health and understanding of ecological processes in most of the fire rotation categories that we identified.This revised version was published online in May 2005 with corrections to the Cover Date.     

浅谈科学发展观与草地生态建设

草地退化是我国天然草地面临的突出问题。我国草地占据了农牧交错带和绿洲-荒漠交错带,对人为活动具有较强的敏感性和生态脆弱性,因此在草地生态建设方面要坚持以人为本,树立全面、协调、可持续的科学发展观,统筹人与自然的和谐发展,充分发挥草地的自然修复能力,建设人工草地,合理的对草地进行开发和利用,完善草地的生态建设,使草地朝着有利于人类生存和发展的方向演变。     

Challenges in developing and implementing a decision support systems (ETÇAP) in forest management planning: a case study in Honaz and Ibradı, Turkey

Decision support systems (DSSs) are indispensable tools in preparing a forest management plan for a better combination of multiple forest values. This study attempted to develop and explain a stand-based forest management DSS (Ecosystem-based multiple-use forest planning [ETÇAP]) comprising a traditional simulation, linear programming (LP), metaheuristics and geographic information system. The model consists of five submodels; traditional management approach to handle inventory data, an empirical growth and yield model, a simulation to conceptualize management actions, a LP technique to optimize resource allocation and a simulated annealing approach to directly create a spatially feasible harvest schedule. The ETÇAP model has been implemented in a comparative two case study areas; Denizli–Honaz and Akseki–Ibrad?. Both simulation and optimization models outperformed to the traditional management plan. The periodical change of growing stock, allowable cuts, carbon sequestration and water production are used as performance indicators. The results showed that more amount of wood could be harvested over time compared to traditional level of harvesting. It could be concluded that various management strategies allowed managers to stimulate more decision options for better outputs through intertemporal trade-offs of management interventions as the model provided tools to quantify forest dynamics over time and space. Challenges exist to establish the functional relationships between forest structure and values for better quantification and integration into the management plans.     

区域层面发展循环经济的挑战和路径选择——以安徽省为例

阐述了区域发展循环经济的基础和契机,以安徽省为例分析了发展循环经济面临资源制约和环境压力加大、配套政策法制体系有待进一步完善和贯彻落实、循环经济指标尚未纳入政绩考核、循环经济技术支撑基础依然亟需加强等挑战,提出以任务和目标明确循环经济发展的方向、以重点领域作为循环经济发展的载体、以重点工程作为发展循环经济的手段、以制度建设作为循环经济发展的保障等路径。     

环植所科研主体向海口转移工作与方案研究

中国热带农业科学院环境与植物保护研究所是从事热带农业环境与植物保护领域研究的国家级公益类非营利性研究所。海口环境与植物保护研究实验室项目工程即将竣工，该所科研主体由儋州向海口转移工作已列入所2011年计划的第一项重点工作。从工作方案入手，重点从领导管理、群众参与、宣传引导、督导落实等方面提出建议确保转移工作平稳有序。     

农业科研单位年鉴编纂工作的思考

结合河北省农林科学院年鉴编纂工作的实际情况,针对存在的部分问题,提出健全编辑队伍、加强业务培训、完善激励机制、重视编校质量、创新编纂工作的建议。