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吴起县，一个曾经是陕北最贫困的农业县，作为最早开始退耕还林试点的工程县之一和我国退耕还林工程建设的典型缩影，从退耕还林开始到目前已经走过了10个年头。自己作为一名全过程参与实施退耕还林工程并一直牵头负责吴起县退耕还林工程科技试验示范点的见证人，亲眼目睹了吴起县退耕还林前后的生态、经济和社会变迁，有许多感触，写就此文，意在能为当前及今后退耕还林工程的稳步推进和健康发展提供一些启示。 相似文献
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安徽省退耕还林工程总体构想与实施对策 总被引：1，自引：0，他引：1
安徽省实施退耕还林工程，是优化配置土地资源，改善生态环境质量，促进社会经济可持续发展的根本和切入点，意义重大，影响深远。通过全面分析安徽省实施退耕还林工程的目的意义和建设条件，提出了全省2002年退耕还林工程建设总体构想，并指出保障退耕还林工程顺利进展的对策。 相似文献
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针对安徽省近年来退耕还林工程建设的实施情况，探讨了退耕还林工程方案设计原则，并对退耕还林工程科技支撑方案的内容进行了简要的阐述，供林业部门在实施退耕还林工程时参考。 相似文献
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退耕还林是灵石县改善生态环境，促进可持续发展的重要工程。介绍了该县实施退耕还林工程取得的成就，提出了巩固退耕还林成果的措施和建议。 相似文献
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退耕还林工程是湘西自治州林业发展史上最为浩大的一项民心工程和德政工作。作为全省退耕还林的主战场，其任务完成的好坏，不仅影响到全州乃至全省退耕还林的声誉，而且影响到下一期退耕还林工程的实施和国家其他项目的投入。因此，必须十分珍惜这项来之不易的工程，站在讲政治和对历史负责的高度来搞好这项工程。认清形势，强化责任，切实当好党委、政府的参谋根据省里的初步安排，自治州退耕还林总任务20.53万公顷，投资达30多亿元。这么大的任务，这么大的投入，州林业局要特别抓好两点：一是要明确职责，找准位置。退耕还林工程事关全… 相似文献
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今年，我省将全面启动退耕还林工程。国家安排给我省的退耕还林任务为20万公顷，其中退耕还林10万公顷，荒山荒地造林10万公顷。为把今年的退耕还林任务落到实处，要切实抓好以下几项工作：一、提高思想认识，落实目标责任全面启动实施退耕还林工程，是以江泽民同志为核心的党中央作出的一项重大决策，是实施西部大开发的根本性措施和切入点，是全省各族人民自身生存发展的需要，是建设绿色经济强省的关键。我们要珍惜这一难得的历史机遇，切实把退耕还林工程作为推进经济社会可持续发展的战略性工作和“德政工程”、“富民工程”，纳入各级… 相似文献
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退耕地是具有一定高度和坡度的特殊土地体系，受地形因素和自然规律的综合作用，孕育了经营模式上的多样性和复杂性。在分析四川水土流失现状和退耕还林工程总体布局的基础上，设计退耕还林经营模式，从宏观上提出特殊区域地方特色的退耕还林模式，以指导退耕还林工程。 相似文献
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贵州省退耕还林工程阶段性评价研究 总被引：5，自引：0，他引：5
通过对全省86个退耕还林工程县退耕前后社会经济情况的统计调查、对工程区11个退耕还林重点县的20个乡688户退耕户的人户调查以及对典型案例的追踪调查结果，结合退耕还林固定样地和径流场观测结果，分析研究了退耕还林工程对贵州生态环境的改善，对农村社会经济的影响，初步评价了贵州省2000～2002年退耕还林工程的生态效益，重点评价了经济和社会效益。 相似文献
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调查近2～4年常德引种的16个杨树品种造林生长和抗逆性情况，以及不同立地条件、培管措施等因素对杨树品种生长的影响，从中筛选出适应当地发展的杨树品种，并对杨树造林提出建议。 相似文献
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华山松集体人工林抚育间伐探索 总被引：1，自引：0，他引：1
为探索华山松集体林抚育间伐的强度、组织形式和管理办法。通海县林业局1995年开始在九街镇香箐头对1988年栽植的华山松幼林进行抚育间伐试验。在试验中引入市场竞争机制，实行招投标制，辅以科学规划，现场培训。加强监督，达标验收，收支结算等措施，取得了工效提高8倍的效果，并进行了讨论。 相似文献
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In densely populated regions, forests can help protect communities and infrastructures from natural hazards such as avalanches and rockfall. To promote the protective function, substantial efforts are made to actively manage forest stands. In 2009 alone the Swiss government invested more than 60 million sfr for the maintenance of protection forests. However, to date there has been no comprehensive evaluation of how the structural development of actively managed stands differs from that of passively managed stands in the Alps. Over the past century the structure of Norway-spruce dominated subalpine forests of the Swiss Alps has been changing and it is not clear how these changes affect the potential protective function of these forests, as well as other forest functions such as wildlife habitat. Furthermore, it is not clear how stand dynamics and structural changes differ between stands that are actively managed and those that are passively managed, and thus to what degree active efforts of forest management are contributing to stands that actually have a greater protective function than passively managed forests.In this study, we analyzed the dynamics of subalpine forests using time series of forest inventory data and examined the influence of active vs. passive management, exposition, distance to treeline, elevation and slope steepness on stand structure and dynamics. We analyzed data from 395 plots in dense, subalpine, spruce-dominated forests in the Swiss Alps. Data were collected during three distinct periods (1983-1985, 1993-1995 and 2004-2006) as part of the Swiss National Forest Inventory (NFI). Using regression trees and multivariate statistics, we investigated which factors have the most important influence on tree growth and stand development.Overall, forest density increased significantly over the last 20 years and the predominance of dense forests increased at higher elevations. However, forest density has not increased in actively managed forests over the past 10 years. In passively managed stands, density was higher on south-facing slopes than on north-facing slopes. The volume and density of dead wood has increased over the last 20 years in both actively managed and passively managed forests. Active management over the last 20 years has maintained forest conditions that adequately maintain stands’ protection functions in the Swiss Alps. However, stand development, especially increasing density, in the passively managed stands of the Swiss Alps suggests that the majority of passively managed stands also provide adequate protective functions against rock and avalanche hazards without the high costs of active management. 相似文献
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1990年以来,钱学森山水城市理论不断被关注和研究.以城市经营理念和风景资源属性变迁为立论基础,分析认为,山水风景资源应该是城市经营的主要内容之一,山水风景资源本身具有可以经营的多元价值.在结合绍兴兰亭,临安玲珑山案例分析后指出,在当前的城市化进程中,浙江的城镇化建设需要以城市经营的理念经营城市中的山水风景资源.浙江山水风景资源作为未来可进入市场竞争的城市经营对象,必须在价值导向上首先建立山水文化价值维度,在经营思路上要有整体性的保护和开发,在具体实践中要注重多元价值的综合关注. 相似文献
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Uncaria species (Gouteng in Chinese) have been used as a plant medicine to treat ailments of cardiovascular and central nervous systems. As the main alkaloid constituent of Uncaria species, isorhynchophylline has drawn extensive attention toward antihypertensive and neuroprotective activities in recent years. Isorhynchophylline mainly acts on cardiovascular and central nervous systems diseases including hypertension, brachycardia, arrhythmia, and sedation, vascular dementia, and amnesia. Isorhynchophylline also has effects on anticoagulation, inhibition vascular smooth muscle cell apoptosis and proliferation, anti-multidrug resistant of lung cells, anti-endotoxemic, and antispasmodic. The active mechanisms are related to modulation on calcium ion channel, protection neural and neuroglial cells against β-amyloid(25-35)-induced neurotoxicity and via inducing autophagy. As a candidate drug of several cardiovascular and central nervous systems diseases, isorhynchophylline will attract scientists to pursue the potential related pharmacological effects and its mechanism with new technologies. But relatively few clinical application of isorhynchophylline has been conducted on its pharmacological activities. It requires more in vivo validations and further investigations of antihypertensive and neuroprotective mechanisms of isorhynchophylline. 相似文献
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武定县干热河谷地区包括东坡乡等7个乡镇1365．9km^2,由于立地条件差,气候干热,因此造林成活率低。自1999年以来,随着中德合作造林、天保工程、退耕还林工程的实施,其造林成活率达91．9％,保存率89％。文章总结了历年造林中成功的经验、失败的教训,认为采取良种壮苗、树种选择、集水保墒、适时造林、加强抚育等措施,干热河谷地区的造林会获得成功。 相似文献
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Rheum palmatum Linn has been widely applied in the clinical treatment of diabetes mellitus. It has been found that emodin as the major bioactive component of R. palmatum L exhibits the competency to activate peroxisomal proliferator-activated receptor-γ (PPARγ) in vitro. So the aim of this study was to evaluate the anti-diabetic effects of emodin through the activation of PPARγ on high-fat diet-fed and low dose of streptozotocin (STZ)-induced diabetic mice. The diabetic mice were intraperitoneally injected with emodin for three weeks. No changes of food consumption and the body weight in emodin-treated mice were monitored daily during the entire experiment. At the end of experiment, the levels of blood glucose, triglyceride and total cholesterol in serum were significantly decreased after emodin treatment. However, serum high-density lipoprotein cholesterol (HDLc) concentration was significantly elevated. The glucose tolerance and insulin sensitivity in emodin-treated group were significantly improved. Furthermore, the results of quantitative RT-PCR analysis showed that emodin significantly elevated the mRNA expression level of PPARγ and regulated the mRNA expressions of LPL, FAT/CD36, resistin and FABPs (ap2) in liver and adipocyte tissues. No effects on the mRNA expressions of PPARα and PPARα-target genes were observed. Taken together, the results suggested that the activation of PPARγ and the modulation of metabolism-related genes were likely involved in the anti-diabetic effects of emodin. 相似文献