山地是地球生命支撑体系的一个重要组成部分,是关系到地球生态系统生存与发展的基础。随着人口的增加和社会经济的发展,山地的“水塔”作用越来越重要,同时山地拥有丰富的生物资源,是全球生物多样性的核心区。与其它复合生态系统相比,山地生态系统更具不稳定性和脆弱性,如果人类活动强度超越山地生态系统的承受能力,就会使生态退化日趋严重,环境污染加剧,山地生态系统逆向演替更明显,进程加快。目前,国际上开展了多方面的山地生态系统研究工作。在国内,山地生态系统的相关研究多集中在西南地区,广大西北部地区起步较晚并且成果不多。鉴于以上分析,选取黑河干流肃南山地作为研究区,以其山地生态系统作为研究对象,分析其动态变化与原因,通过对山地生态系统协调度的评估,提出本区山地生态系统协调发展的具体对策,以期为黑河干流肃南山地生态系统的协调发展提供科学的理论依据,同时亦为西北地区山地生态系统的协调发展提供参考。论文共分六部分。
第一部分首先阐述了选题背景及国内外山地生态系统的研究进展,在此基础上,论述了选题依据、研究意义及研究的理论与方法。
第二部分概述了黑河干流肃南山地的概况及山地生态系统的组成与结构。从位置、面积、地形地貌、气候、水资源、植被和土壤等方面简述了黑河干流肃南山地生态系统的自然环境;从人口、民族、GDP、人均纯收入等方面简述了研究区山地生态系统的社会经济状况;从森林生态系统、草地生态系统和农田生态系统三方面详细论述了研究区山地生态系统的组成与结构。
第三部分分析了黑河干流肃南山地生态系统的动态变化。首先分析了研究区森林生态系统的动态变化及其存在问题;其次以西水自然保护站为例,运用Arcview和Arc/info软件对1992年和2001年的西水自然保护站1:50000林相图进行矢量化处理,并利用景观指数分析了森林生态系统中乔木林、灌木林的变化及其存在问题。第三,对草地生态系统和农田生态系统的动态变化及存在问题也进行了详细分析。
第四部分剖析了黑河干流肃南山地生态系统动态变化的原因。认为影响山地生态系统协调发展的原因主要有自然原因和人为原因两方面。在近几十年中,自然原因不是影响本区山地生态系统协调发展的主要原因,而人畜增长及
The mountainous region is an important component of the system, which supports the life on earth, and is a foundation, which concerns the survival and development of ecosystem on the earth. With the increasing of population and the development of society and economy, the $$water tower$$ function of the mountainous region is more and more important, at the same time there are abundant living resources in the mountainous region, it is the key district of the bio-diversity in the globe. Compared with the other complex ecosystems, the ecosystem of mountainous region is more instability and fragility. If the intensity of the human activity exceeds the bearing ability of the ecosystem of mountainous region, the degradation of the ecology will be becoming more and more serious, the pollution of the environment will be aggravating, the reverse performance of ecosystem of mountainous region will be becoming more and more obvious, and its process is accelerated. At present, the researching work on the ecosystem of the mountain region has been launched in many aspects in the world. In our country, the most relevant researches in the ecosystem of mountainous region have been concentrated in the southwest, which start later in the vast northwest and there are a few achievements. In consideration of the above analysis, choosing Sunan mountainous region of mainstream of Heihe River as
regarding its ecosystem of mountainous region as th and analyzing the dynamic change, reason of change, and coordination degree of the ecosystem of the mountainous region, to offer the scientific theoretical foundation for the coordinated development of the ecosystem of Sunan mountainous region of mainstream of Heihe River, at the same time, also to offer reference for the coordinated development of the ecosystem of the mountainous region in Northwest. The thesis is divided into six parts altogether.First part has explained the background of the selected title and the domestic and international research progress in the ecosystem of the mountainous region. On this basis, this part has described the basis of the selected title, the researching meaning and the theory and method of research.Second part has summed up the survey of Sunan mountainous region of mainstream of Heihe River, and the composition and structure of the ecosystem of its mountainous region. Narrating the natural environment of the ecosystem of Sunan mountainous region of mainstream of Heihe River from position, area, topography and landforms, climate, water resource, vegetation, soil, Sketching the social economic situation of the ecosystem ofmountainous region in researching area from such respects as people, nationality, GDP, per capita net income, etc. and explaining the composition and structure of the ecosystem of mountainous region of researching area in detail from three following respects: the forest ecosystem, the grassland ecosystem and the farmland ecosystem.The third part has analyzed the dynamic changes of the ecosystem of Sunan mountainous region of mainstream of Heihe River. Firstly, analyzing the dynamic changes and the problems existing in the forest ecosystem in
Secondly, taking Xishui natural conservation station as the example, vectoring the picture of Forest construction in Xishui natural conservation station through using Arcview and Arc/info software, and utilizing the landscape indices to analyze the changes and problems of the arbor forest and bush forest in the forest ecosystem. In addition, analyzing the dynamic changes and the problems existing in the grassland ecosystem and the farmland ecosystem.The fourth part has analyzed the reasons of the dynamic changes of Sunan mountainous region of mainstream of Heihe River. Thinking there are two mainly reasons influencing the coordinated development of the ecosystem of the mountain region, one is the natural reason, the other is man-induced reason. In
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盈丰国际2016年第二批公开招聘事业单位工作人员简章2016年度上半年盈丰国际公开招聘拟聘用人员公示下图为南美洲北部奥里诺科河流域（主体部分）示意图及M地降水量月分配图。读图完成下列题。小题1:下列关于该河流特征的叙述，正确的是A．干、支流水流平稳B．干、支流水量季节变化小C．干流贴近东南高地与地转偏向力无关D．气侯是干流两侧支流分布差异的主要影响因素小题2:下列关于该河流域主要自然地理特征的叙述，正确的是A．地形以高原、山地为主B．植被以热带草原为主C．气候以热带雨林气候为主D．水循环以陆上循环为主小题3:下列产业中，最有可能成为支柱性产业的是A．小麦为主的旱田农业B．热带迁移农业C．石油工业和钢铁工业D．林业和造纸业 - 跟谁学
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在线咨询您好，告诉我您想学什么，15分钟为您匹配优质老师哦马上咨询& > && >&& >&下图为南美洲北部奥里诺科河流域（主体部分）示意图及M地降水量月分配图。读图完成下列题。小题1:下列关于该河流特征的叙述，正确的是A．干、支流水流平稳B．干、支流水量季节变化小C．干流贴近东南高地与地转偏向力无关D．气侯是干流两侧支流分布差异的主要影响因素小题2:下列关于该河流域主要自然地理特征的叙述，正确的是A．地形以高原、山地为主B．植被以热带草原为主C．气候以热带雨林气候为主D．水循环以陆上循环为主小题3:下列产业中，最有可能成为支柱性产业的是A．小麦为主的旱田农业B．热带迁移农业C．石油工业和钢铁工业D．林业和造纸业下图为南美洲北部奥里诺科河流域（主体部分）示意图及M地降水量月分配图。读图完成下列题。小题1:下列关于该河流特征的叙述，正确的是A．干、支流水流平稳B．干、支流水量季节变化小C．干流贴近东南高地与地转偏向力无关D．气侯是干流两侧支流分布差异的主要影响因素小题2:下列关于该河流域主要自然地理特征的叙述，正确的是A．地形以高原、山地为主B．植被以热带草原为主C．气候以热带雨林气候为主D．水循环以陆上循环为主小题3:下列产业中，最有可能成为支柱性产业的是A．小麦为主的旱田农业B．热带迁移农业C．石油工业和钢铁工业D．林业和造纸业科目: 高中地理最佳答案小题1:D
小题3:C解析
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