庆阳市绿色用地利用结构与土地生态安全评价研究

发布时间：2018-05-20 01:08

本文选题：绿色用地利用结构 + 土地生态安全　；参考：《甘肃农业大学》2015年硕士论文

【摘要】：本文以庆阳市为研究对象,在可利用土地面积有限,污染和闲置造成生态环境破坏的背景下,对庆阳市绿色用地利用结构的合理性和土地生态安全评价研究显得非常重要。借鉴李维珍、兖津宇等学者对土地利用与土地生态安全之间的辩证研究,评价绿色用地利用结构合理性是土地生态安全研究的基础,土地生态安全是衡量绿色用地利用结构是否合理。建立绿当量和PSR模型,前者是提取绿色用地类型和面积,从生态效益评价各县区绿色用地利用结构的合理性;后者是获取关于人口、经济、环境数据,从生态、社会、经济三方面评价土地生态安全。主要结论如下:(1)庆阳市各县区生态绿当量水平分布不均匀。7县1区中西峰区、环县、庆城县、华池县、镇原县的生态绿当量1,绿色用地利用结构不合理,在未来规划中要大范围调整土地利用结构;而合水县、正宁县、宁县的生态绿当量均1,绿色用地利用结构比较合理。(2)林地系统中属合水县生态绿当量水平最高,为当地土地生态安全起到重要作用,环县最低;旱地系统中镇原县生态绿当量水平最高,是庆阳市粮食作物和经济作物重要产地,合水县最低;草地系统属环县生态绿当量水平最高,为庆阳市生态环境做出很大贡献,正宁县最低。庆阳市水浇地和园地面积分布不均匀,并且用地面积较少,对生态环境贡献少。(3)自然因素中坡度是影响庆阳市具有绿当量用地格局分布的最重要因素,决定着植被生物的区位。庆阳市坡度0°-3°和3°-8°的区域由于人类活动频繁造成生态绿当量水平低;坡度5°-15°和15°-20°的区域耕种作业较发达造成生态绿当量水平较低;坡度20°-25°和大于25°的区域是自然生物资源最为丰富的地方,其生态绿当量水平较高。GDP高的区域反而生态绿当量较低,城镇人口占比较低的区域反而生态绿当量水平高。(4)合水县土地生态系统安全基本达标,可持续发展能力较强;正宁县、宁县土地生态系统安全达到临界点,可持续发展能力一般;西峰区,华池县,镇原县,庆城县,环县的土地生态系统面临着安全威胁,可持续发展能力差,应加强生态环境保护。
[Abstract]:In this paper, Qingyang City as the research object, under the background of limited available land area, pollution and idle ecological environment damage, it is very important to study the rationality of the green land use structure and the evaluation of land ecological security in Qingyang City. Based on the dialectical study of land use and land ecological security by Li Weizhen, Yanjin Yu and other scholars, it is the basis of land ecological security research to evaluate the rationality of green land use structure. Land ecological security is to measure whether the structure of green land use is reasonable. The former is to extract the type and area of green land and evaluate the rationality of the structure of green land use from ecological benefit, the latter is to obtain data on population, economy, environment, ecology and society. Three aspects of economic evaluation of land ecological security. The main conclusions are as follows: (1) the level distribution of ecological green equivalent in different counties and districts of Qingyang City is not even. 7. The ecological green equivalent of area 1, Huan County, Qingcheng County, Huachi County, Zhenyuan County is 1, and the structure of green land use is unreasonable. In the future planning, the land use structure should be adjusted on a large scale, while the ecological green equivalent of Heshui County, Zhengning County and Ningxian County are all 1, and the green land use structure is more reasonable. 2) in the forest land system, the ecological green equivalent level of Heshui County is the highest. The ecological equivalent level of Zhenyuan county is the highest in dry land system, which is the important producing area of grain crops and cash crops in Qingyang city, and the lowest in Heshui county. The grassland system belongs to the highest level of ecological green equivalent in Huan County, which contributes greatly to the ecological environment of Qingyang City, and is the lowest in Zhengning County. In Qingyang city, the distribution of irrigated land and garden land area is uneven, and the land area is less, and the contribution to ecological environment is less. 3) among the natural factors, slope is the most important factor affecting the distribution of land use pattern with green equivalent in Qingyang city, which determines the location of vegetation organisms. The area with 0 掳-3 掳and 3 掳-8 掳slope in Qingyang City has low eco-green equivalent level due to frequent human activities, and the area with 5 掳-15 掳and 15 掳-20 掳slope has lower eco-green equivalent level. The areas with 20 掳-25 掳slope and more than 25 掳are the most abundant areas of natural biological resources. The areas with higher ecological green equivalent level and higher GDP have lower ecological green equivalent. On the contrary, the area with low urban population occupies a high level of ecological green equivalent. 4) the security of land ecosystem in Heshui County is basically up to standard, and the ability of sustainable development is relatively strong, and the safety of land ecosystem in Zhengning County and Ningxian County has reached a critical point. The land ecosystem of Xinfeng District, Huachi County, Zhenyuan County, Qingcheng County and Huan County is facing the security threat, and the ability of sustainable development is poor, so the ecological environment protection should be strengthened.
【学位授予单位】：甘肃农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X826;F301.2

【参考文献】