發(fā)布時間：2018-05-20 01:08

  本文選題：綠色用地利用結(jié)構(gòu) + 土地生態(tài)安全�。� 參考：《甘肅農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：本文以慶陽市為研究對象,在可利用土地面積有限,污染和閑置造成生態(tài)環(huán)境破壞的背景下,對慶陽市綠色用地利用結(jié)構(gòu)的合理性和土地生態(tài)安全評價研究顯得非常重要。借鑒李維珍、兗津宇等學(xué)者對土地利用與土地生態(tài)安全之間的辯證研究,評價綠色用地利用結(jié)構(gòu)合理性是土地生態(tài)安全研究的基礎(chǔ),土地生態(tài)安全是衡量綠色用地利用結(jié)構(gòu)是否合理。建立綠當(dāng)量和PSR模型,前者是提取綠色用地類型和面積,從生態(tài)效益評價各縣區(qū)綠色用地利用結(jié)構(gòu)的合理性;后者是獲取關(guān)于人口、經(jīng)濟、環(huán)境數(shù)據(jù),從生態(tài)、社會、經(jīng)濟三方面評價土地生態(tài)安全。主要結(jié)論如下:(1)慶陽市各縣區(qū)生態(tài)綠當(dāng)量水平分布不均勻。7縣1區(qū)中西峰區(qū)、環(huán)縣、慶城縣、華池縣、鎮(zhèn)原縣的生態(tài)綠當(dāng)量1,綠色用地利用結(jié)構(gòu)不合理,在未來規(guī)劃中要大范圍調(diào)整土地利用結(jié)構(gòu);而合水縣、正寧縣、寧縣的生態(tài)綠當(dāng)量均1,綠色用地利用結(jié)構(gòu)比較合理。(2)林地系統(tǒng)中屬合水縣生態(tài)綠當(dāng)量水平最高,為當(dāng)?shù)赝恋厣鷳B(tài)安全起到重要作用,環(huán)縣最低;旱地系統(tǒng)中鎮(zhèn)原縣生態(tài)綠當(dāng)量水平最高,是慶陽市糧食作物和經(jīng)濟作物重要產(chǎn)地,合水縣最低;草地系統(tǒng)屬環(huán)縣生態(tài)綠當(dāng)量水平最高,為慶陽市生態(tài)環(huán)境做出很大貢獻,正寧縣最低。慶陽市水澆地和園地面積分布不均勻,并且用地面積較少,對生態(tài)環(huán)境貢獻少。(3)自然因素中坡度是影響慶陽市具有綠當(dāng)量用地格局分布的最重要因素,決定著植被生物的區(qū)位。慶陽市坡度0°-3°和3°-8°的區(qū)域由于人類活動頻繁造成生態(tài)綠當(dāng)量水平低;坡度5°-15°和15°-20°的區(qū)域耕種作業(yè)較發(fā)達造成生態(tài)綠當(dāng)量水平較低;坡度20°-25°和大于25°的區(qū)域是自然生物資源最為豐富的地方,其生態(tài)綠當(dāng)量水平較高。GDP高的區(qū)域反而生態(tài)綠當(dāng)量較低,城鎮(zhèn)人口占比較低的區(qū)域反而生態(tài)綠當(dāng)量水平高。(4)合水縣土地生態(tài)系統(tǒng)安全基本達標(biāo),可持續(xù)發(fā)展能力較強;正寧縣、寧縣土地生態(tài)系統(tǒng)安全達到臨界點,可持續(xù)發(fā)展能力一般;西峰區(qū),華池縣,鎮(zhèn)原縣,慶城縣,環(huán)縣的土地生態(tài)系統(tǒng)面臨著安全威脅,可持續(xù)發(fā)展能力差,應(yīng)加強生態(tài)環(huán)境保護。
[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 擄-3 擄and 3 擄-8 擄slope in Qingyang City has low eco-green equivalent level due to frequent human activities, and the area with 5 擄-15 擄and 15 擄-20 擄slope has lower eco-green equivalent level. The areas with 20 擄-25 擄slope and more than 25 擄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.
【學(xué)位授予單位】：甘肅農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X826;F301.2

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