本文選題：大通縣 + 立地類型劃分��； 參考：《青海大學(xué)》2017年碩士論文

【摘要】：本文以青海省大通縣為研究區(qū),通過(guò)野外調(diào)查和資料收集,結(jié)合數(shù)量化理論Ⅰ確定影響大通縣林地立地類型的主導(dǎo)因子。并利用GIS技術(shù)對(duì)研究區(qū)的林業(yè)用地進(jìn)行立地類型的劃分,生成立地類型圖以及適宜樹種配置圖,為大通縣綠化造林、植被恢復(fù)提供指導(dǎo),以此來(lái)更好地發(fā)揮森林的生產(chǎn)潛力,改善大通縣的生態(tài)環(huán)境。(1)土壤含水量作為影響植物生長(zhǎng)的一個(gè)重要因素,因其不可控性,無(wú)法隨時(shí)監(jiān)測(cè),而又因土壤含水量的變化主要是由地形因子的變化而間接引起的�；诖擞^點(diǎn),運(yùn)用數(shù)量化理論Ⅰ建立數(shù)學(xué)模型,來(lái)確定各地形因子對(duì)土壤水分的貢獻(xiàn)大小,以及根據(jù)野外調(diào)查情況,選擇把坡度、坡向、海拔3個(gè)地形因子確定為影響大通縣林地立地類型劃分的主導(dǎo)因子,并利用ArcGIS軟件提取立地因子專題圖。(2)通過(guò)將大通縣的林業(yè)用地圖、行政區(qū)劃圖、土壤圖以及坡度、坡向、海拔專題圖進(jìn)行疊置分析,得到大通縣林地立地類型管理單元圖,再由其派生出大通縣的林業(yè)用地立地類型圖。由圖可以得出大通縣林地主要被分為2200-2600m陽(yáng)坡平緩坡、2200-2600m陰坡陡坡、2600-3200m陰坡斜坡、3200-3600m陰坡平緩坡、3600m以上陽(yáng)坡平緩坡、3600m以上陽(yáng)坡斜坡等23種立地類型,其中3200-3600m陰坡斜坡這一立地類型面積最大,占大通縣林業(yè)用地面積的11.643%,而2200-2600m陰坡陡坡類型面積最小,只占了0.006%。(3)根據(jù)研究區(qū)植被生長(zhǎng)狀況調(diào)查結(jié)果以及植被的生態(tài)學(xué)特性,以適地適樹為原則,為各立地類型選擇適宜的造林樹種,喬木以青海云杉、祁連圓柏、白樺、山楊等為主,灌木以沙棘、金露梅、銀露梅、山生柳、峨眉薔薇等為主,進(jìn)行樹種配置,生成適宜樹種配置圖。(4)以土壤水分含量為先導(dǎo),利用GIS對(duì)大通縣林業(yè)用地進(jìn)行適宜樹種配置,方法是可行、可靠的,可在今后的林業(yè)生產(chǎn)中廣為使用。
[Abstract]:This paper takes Datong County in Qinghai Province as the research area, through field investigation and data collection, combined with quantitative theory I to determine the dominant factors affecting forest site types in Datong County. Using GIS technology, the site types of forestry land in the study area are divided, and site type maps and suitable tree species configuration maps are generated, which can provide guidance for afforestation and vegetation restoration in Datong County, so as to bring the forest productive potential into full play. Improvement of ecological environment in Datong County. (1) soil water content as an important factor affecting plant growth, because of its uncontrollable, can not be monitored at any time, and the change of soil water content is mainly caused by the change of topographic factors. Based on this viewpoint, a mathematical model was established by using quantitative theory 鈪，

本文編號(hào)：2095194