基于系统耦合的区域生态安全格局构建——以酒泉市肃州区为例   总被引：1，自引：1，他引：0  

──以酒泉市肃州区为例  龙涛  刘学录  黄万状 《中国农学通报》2015,31(5):132-138

构建区域生态安全格局对区域的可持续发展有重要的意义,肃州区位于河西走廊中西部,生态环境脆弱,水资源短缺,生态环境建设与保护形势依然严峻,通过构建区域生态安全格局实现可持续发展尤为重要。通过运用定性、定量相结合的方法分析肃州区的景观格局和景观安全格局。最后,运用系统耦合和景观生态学尺度变化的原理和方法,结合肃州区特点,构建肃州区区域生态安全格局。随着尺度的逐渐变大,区域生态安全格局包括生态资源系统耦合、自然—社会系统耦合、农业生态系统耦合、景观安全格局耦合和生态地理区域耦合5个耦合模式。  相似文献   

蔬菜中重金属元素测定的前处理方法     

程水清  周贯勇 《安徽农业科学》2006,34(16):3889-3890

采用稀酸提取法前处理蔬菜样品,测定了重金属元素含量,比较了稀酸提取法和国标法的精密度、回收率,结果表明:稀酸提取法测定Cu、Zn、Cd的精密度和回收率均接近于国标法,且稀酸提取法具有简便、快速等优势;但稀酸提取法测定重金属元素Cr、Mn的结果与国标法差异较大。  相似文献   

宁夏农垦现代化养猪产业园区规划设计     

张敏  邹志荣 《西北农业学报》2009,18(3):337-340

农业园区是政府或企业为实现农业发展目标而创立的,随着农业产业结构的调整,其特殊区位环境也在逐渐发展.本文从宁夏农垦现代化养猪园区的概况、规划范围、规划构思、规划结构及规划特点几方面进行了阐述,旨在探讨园区规划设计的理念与方法,同时为同类农业园区规划建设提供借鉴,使其本身的功能结构与布局更加科学,从而产生更好的经济、生态和社会效益,实现园区的可持续发展.  相似文献   

海南昌江县石斛属植物资源的调查     

白丽丽  戴华 《安徽农业科学》2011,39(7):3944-3945

对海南昌江地区石斛属植物进行了调查,基本掌握了其资源现状,并分析了野生石斛属植物濒临灭绝的原因,提出了对石斛属植物的保护及开发利用的建议,为石斛资源的可持续利用提供了科学依据。  相似文献   

习惯法对我国农村法治建设的影响     

宋屹东 《安徽农业科学》2011,39(26):16268-16269,16271

分析了在农村社会中国家法与习惯法之间的联系,指出两者即互相补充又可能出现冲突,在此基础上提出我国农村社会法治建设的关键在于正确处理国家制定法与习惯法的关系,即在坚持国家制定法主导地位的前提下,合理吸收、借鉴习惯法的优秀做法,使两者真正形成合力。  相似文献   

海南农垦胡椒产业链发展模式探讨     

韦明  胡玉贞  郑素芳 《热带作物学报》2011,31(11):86-88

介绍海南农垦胡椒产业发展的基本情况,分析其目前存在的主要问题,提出海南农垦胡椒产业链发展模式的对策与建议。  相似文献   

The Ham and Eggs Plant,Lantana camara     

James H. Diaz 《The Forestry Chronicle》2017,28(3):273-274

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Landslide densities associated with rainfall,stand age,and topography on forested landscapes,southwestern Washington,USA     

Ted R. Turner  Steven D. Duke  Brian R. Fransen  Maryanne L. Reiter  Andrew J. Kroll  Jim W. Ward  Janette L. Bach  Tiffany E. Justice  Robert E. Bilby 《Forest Ecology and Management》2010

Elevated landslide rates in forested landscapes can adversely impact aquatic habitat and water quality and remove and/or degrade soil resources required for forest regeneration. As a result, understanding the associations between management actions, natural factors, and landslide rates is important information needed for land managers. An unusual and powerful storm in early December, 2007, caused record flooding and thousands of landslides across southwest Washington and northwest Oregon, USA, and provided a rare opportunity to examine the effects of both natural factors and forest management practices on landslide density. Landslide inventory data were collected from both aerial photos and systematic field surveys to provide a broad survey database that was used to develop estimates of landslide density and to examine associations between landslide density, precipitation, topography, and forest stand age across a 152,000 ha forested landscape in the Willapa Hills, Washington. We estimated the probability of detecting landslides on aerial photos for six strata defined by forest stand age and a broad range of rainfall intensity, expressed as percent of the 100-year, 24-h, maximum rainfall. Key findings are that landslide detection probability decreased with increasing stand age, but was similar across rainfall intensities. The overall fraction of field-detected landslides that were not detected on 1:12,000-scale aerial photos was 39%. Very few landslides occurred in the 0–100% of 100-year rainfall category, regardless of stand age or slope gradient class. At higher rainfall intensities, significantly higher landslide densities occurred on steep slopes (>70% gradient) compared to lower gradient slopes, as expected. Above ∼150% of 100-year rainfall, the density of landslides was ∼2–3 times larger in the 0–5 and 6–10 year stand age categories than in the 11–20, 21–30, 31–40, and 41+ categories. The effect of stand age was strongest at the highest rainfall intensities. Our results demonstrate that ground-based landslide inventory data are required in order to correct for detection bias from aerial photos, develop reasonable estimates of landslide density across environmental gradients such as rainfall magnitude and topography, and make unbiased interpretations of relationships between forest management associations and landslide occurrence.  相似文献   

无量山国家级自然保护区生物多样性及保护对策研究     

袁军 《福建林业科技》2010,37(3)

通过查阅相关资料,阐述了无量山国家级自然保护区生物多样性特点,分析保护生物多样性面临的不利因素,并提出相应的保护对策。  相似文献   

学习借鉴日本经验 促进林业改革发展     

Study Group on Japan private Forest  Training M 《国家林业局管理干部学院学报》2013,12(3):10-14

2012年11月,“民有林与培训管理”赴日研修团到日本进行了培训。日本根据本国经济发展情况,及时调整林业建设方针。对民有林,扶持和组建森林组合,形成规模效应,增加经济效益。全国形成了比较健全的森林经营体系,实现了良性循环,为经济发展和人民生活创造了优美的生态环境。对国有林,逐年精简机构和人员,以中央政府投资作保证,收购生态区位重要的民有林,充分发挥国有林生态保障的主渠道作用。日本有比较健全的林业科研和技术推广体系,有比较科学的干部培训制度,为林业健康快速发展奠定了基础。这些经验都值得我们学习和借鉴。  相似文献