随着社会和经济的不断发展,人们对生活环境越来越重视,而人居环境是人类生存与发展的基础,并从根本上制约着区域人口的集聚水平和分布格局。本文选取地形起伏度对临沧市人居环境地形适宜性进行分析。利用ArcGIS 10.2软件,通过均值变点...随着社会和经济的不断发展,人们对生活环境越来越重视,而人居环境是人类生存与发展的基础,并从根本上制约着区域人口的集聚水平和分布格局。本文选取地形起伏度对临沧市人居环境地形适宜性进行分析。利用ArcGIS 10.2软件,通过均值变点分析法,确定最佳分析窗口大小为0.2025 km2,在此基础上计算地形起伏度,对各乡镇地形起伏度进行区域内部差异分析。运用SPSS软件,对各乡镇的平均人口密度与地形起伏度进行了相关分析和回归分析,相关分析中R2为−0.505,发现二者之间存在显著负相关关系,回归分析中符合逆曲线模型,其R2为0.859。根据地形起伏度将人居环境地形适宜性分为5个级别,高度适宜区地形起伏度值 With the continuous development of society and economy, people are paying more and more attention to the living environment. The living environment is the foundation of human survival and development, and fundamentally restricts the concentration level and distribution pattern of regional population. This article selects terrain undulation to analyze the terrain suitability of the living environment in Lincang City. Using ArcGIS 10.2 software and the mean change point analysis method, the optimal analysis window size was determined to be 0.2025 km2. Based on this, terrain undulation was calculated, and regional differences in terrain undulation were analyzed for each township. Using SPSS software, correlation and regression analysis were conducted on the average population density and terrain undulation of each township. The R2 value in the correlation analysis was −0.505, and a significant negative correlation was found between the two. The regression analysis followed the inverse curve model, with an R2 value of 0.859. According to the terrain undulation, the suitability of living environment terrain is divided into 5 levels. The terrain undulation value of the height suitable area is less than 1.5, accounting for 41.19%;The terrain undulation value in the moderately suitable area is between 1.5 and 2.0, accounting for 36.34%;The terrain undulation value in the low degree suitable area is between 2.0 and 2.5, accounting for 19.28%;The terrain undulation value of the critical suitable area is between 2.5 and 3.0, accounting for 3.03%;The terrain undulation value in the unsuitable area is ≥ 3.0, accounting for 0.16%. Analysis shows that the population of Lincang City is mainly distributed in relatively flat dam areas. This study can provide reference for the rational population layout and socio-economic development of Lincang City.展开更多
为客观准确地评价临沧市普洱生茶的香气品质,本研究系统分析了16份临沧市普洱生茶的主要香气成分,并利用多元统计方法对其主要香气成分进行综合分析。结果表明:共检测到48个香气物质,平均含量大于2%的有11个;其中芳樟醇含量最高,平均含...为客观准确地评价临沧市普洱生茶的香气品质,本研究系统分析了16份临沧市普洱生茶的主要香气成分,并利用多元统计方法对其主要香气成分进行综合分析。结果表明:共检测到48个香气物质,平均含量大于2%的有11个;其中芳樟醇含量最高,平均含量为24.68%。在香气种类上,醇类物质占香气总量的比例最高,平均含量为46.55%;其次是醛类物质,平均含量为26.81%;酮类、酯类和其他类物质占香气总量的比例相对较小。多元统计方法分析表明:临沧市南、北部地区普洱生茶样品能够明显区分开,南部地区醇类、酯类物质含量相对较高,而北部地区醛类、酮类以及其他类物质含量相对较高,海拔高度可能是南、北部地区普洱生茶香气成分差异形成的重要原因;基于变量投影重要性(Variable important for the projection,VIP)大于1,筛选出23个香气成分或种类作为区分临沧市南、北部地区普洱生茶香气的重要标志物,其中芳樟醇、异佛尔酮、酮类、醇类、醛类、β-环柠檬醛、α-环柠檬醛、2,2,6-三甲基环己酮、橙花醇、β-紫罗兰酮的VIP值相对较大,对临沧市南、北部地区普洱生茶分类贡献较大。该研究为准确了解临沧市普洱生茶香气品质提供理论依据,也为临沧市普洱生茶品质、产地判定研究提供思路和方法。展开更多
文摘随着社会和经济的不断发展,人们对生活环境越来越重视,而人居环境是人类生存与发展的基础,并从根本上制约着区域人口的集聚水平和分布格局。本文选取地形起伏度对临沧市人居环境地形适宜性进行分析。利用ArcGIS 10.2软件,通过均值变点分析法,确定最佳分析窗口大小为0.2025 km2,在此基础上计算地形起伏度,对各乡镇地形起伏度进行区域内部差异分析。运用SPSS软件,对各乡镇的平均人口密度与地形起伏度进行了相关分析和回归分析,相关分析中R2为−0.505,发现二者之间存在显著负相关关系,回归分析中符合逆曲线模型,其R2为0.859。根据地形起伏度将人居环境地形适宜性分为5个级别,高度适宜区地形起伏度值 With the continuous development of society and economy, people are paying more and more attention to the living environment. The living environment is the foundation of human survival and development, and fundamentally restricts the concentration level and distribution pattern of regional population. This article selects terrain undulation to analyze the terrain suitability of the living environment in Lincang City. Using ArcGIS 10.2 software and the mean change point analysis method, the optimal analysis window size was determined to be 0.2025 km2. Based on this, terrain undulation was calculated, and regional differences in terrain undulation were analyzed for each township. Using SPSS software, correlation and regression analysis were conducted on the average population density and terrain undulation of each township. The R2 value in the correlation analysis was −0.505, and a significant negative correlation was found between the two. The regression analysis followed the inverse curve model, with an R2 value of 0.859. According to the terrain undulation, the suitability of living environment terrain is divided into 5 levels. The terrain undulation value of the height suitable area is less than 1.5, accounting for 41.19%;The terrain undulation value in the moderately suitable area is between 1.5 and 2.0, accounting for 36.34%;The terrain undulation value in the low degree suitable area is between 2.0 and 2.5, accounting for 19.28%;The terrain undulation value of the critical suitable area is between 2.5 and 3.0, accounting for 3.03%;The terrain undulation value in the unsuitable area is ≥ 3.0, accounting for 0.16%. Analysis shows that the population of Lincang City is mainly distributed in relatively flat dam areas. This study can provide reference for the rational population layout and socio-economic development of Lincang City.
文摘为客观准确地评价临沧市普洱生茶的香气品质,本研究系统分析了16份临沧市普洱生茶的主要香气成分,并利用多元统计方法对其主要香气成分进行综合分析。结果表明:共检测到48个香气物质,平均含量大于2%的有11个;其中芳樟醇含量最高,平均含量为24.68%。在香气种类上,醇类物质占香气总量的比例最高,平均含量为46.55%;其次是醛类物质,平均含量为26.81%;酮类、酯类和其他类物质占香气总量的比例相对较小。多元统计方法分析表明:临沧市南、北部地区普洱生茶样品能够明显区分开,南部地区醇类、酯类物质含量相对较高,而北部地区醛类、酮类以及其他类物质含量相对较高,海拔高度可能是南、北部地区普洱生茶香气成分差异形成的重要原因;基于变量投影重要性(Variable important for the projection,VIP)大于1,筛选出23个香气成分或种类作为区分临沧市南、北部地区普洱生茶香气的重要标志物,其中芳樟醇、异佛尔酮、酮类、醇类、醛类、β-环柠檬醛、α-环柠檬醛、2,2,6-三甲基环己酮、橙花醇、β-紫罗兰酮的VIP值相对较大,对临沧市南、北部地区普洱生茶分类贡献较大。该研究为准确了解临沧市普洱生茶香气品质提供理论依据,也为临沧市普洱生茶品质、产地判定研究提供思路和方法。
