A Spatial Analysis of Urban Color Harmony in Five Global Metropolises     

CHEN Naige  XU Xiaofan  TAN Minghong  WANG Xianming 《资源与生态学报(英文版)》2022,13(2):238-246

Harmonious urban color can reduce urban light pollution, relieve the urban heat island effect, improve the living quality and form a distinctive style. However, due to the manifold architectural styles, urban color in metropolises typically becomes complicated, which may destroy the color harmony of metropolises. Up to now, there has not been enough research on the quantitative expression of the degree of color harmony, and the research on comparing the urban color characteristics of different metropolises is also relatively insufficient. This paper firstly developed a method to quantitatively measure the degrees of color harmony (DCHs) of five metropolises in 2020: London, Tokyo, Chicago, Paris, and Beijing, by writing a Python program and using the Sentinel-2A remote sensing data. GIS buffers were then used to analyze the spatial distribution of the DCHs within each metropolis. In addition, 20 typical samples were selected to analyze the differences of the DCHs between residential and industrial areas. The results showed that: (1) The values of the DCHs of London and Tokyo were the highest, followed by Chicago and Paris, while Beijing was the lowest. (2) The values of the DCHs were increasing from the inside out in Chicago, Paris, and London, while those in Beijing and Tokyo were decreasing. (3) The values of the DCHs in industrial areas were much lower than in residential areas. Based on the above results, policy implications are provided for color management of these metropolises. Lastly, this study may provide a method for the rapid analysis the DCHs for other metropolises.  相似文献   

Exploring the relationship between vegetation and dust-storm intensity (DSI) in China     

Minghong Tan 《地理学报(英文版)》2016,26(4):387-396

It is difficult to estimate the effects of vegetation on dust-storm intensity (DSI) since land surface data are often recorded aerially while DSI is recorded as point data by weather stations. Based on combining both types of data, this paper analyzed the relationship between vegetation and DSI, using a panel data-analysis method that examined six years of data from 186 observation stations in China. The multiple regression results showed that the relationship between changes in vegetation and variance in DSI became weaker from the sub-humid temperate zone (SHTZ) to dry temperate zone (DTZ), as the average normalized difference vegetation index decreased in the four zones in the study area. In the SHTZ and DTZ zones, the regression model could account for approximately 24.9% and 8.6% of the DSI variance, respectively. Lastly, this study provides some policy implications for combating dust storms.  相似文献   

Approximate velocity formula over mobile sediment bed induced by velocity-skewed waves and current     

Xin Chen  Minghong Chen  Jingkai Wu  Haifei Liu  Chen Yang 《国际泥沙研究》2022,37(3):317-327

A velocity formula is proposed for flow over a mobile sediment bed induced by velocity-skewed waves and current. The formula is obtained by a separation of waves and current velocities and requires seven free variables related to free stream velocity and sediment characteristics. The formula includes two parts:(1) a wave part consisting of the free stream velocity and defect function, which considers phase lead, wave boundary layer thickness, and mobile bed level, and(2) a current part, which ch...  相似文献   

土地利用集约度的测度方法   总被引：28，自引：2，他引：26  

李秀彬  朱会义  谈明洪  辛良杰 《地理科学进展》2008,27(6):12-17

针对土地利用集约度测度混乱的状况,文章从投入指标还是产出指标、实物指标还是价值指标、综合测度 还是分项测度、单纯测度还是复合测度以及初级集约度还是次级集约度测度等五个方面,辨析了土地利用集约度 的概念,评价了各种测度方法的特点和应用范围。认为土地集约利用或粗放利用,本身不是土地利用的目标,是实 现土地合理利用的两种基本途径。其本质是资源的替代。把土地集约利用定义为用资本和劳动来替代土地资源的 现象,使集约度变化与用途转换这两种土地利用变化类型联系起来。提出从土地利用变化研究的角度出发,土地利 用集约度的基本测度指标应为单位时间单位土地面积上的资本和劳动的投入数量, 产出指标只可以作为代用指 标。从土地利用变化研究需求的角度,对土地集约度指标的选择提出了建议。  相似文献   

中国耕地利用集约度结构变化及其区域差异   总被引：25，自引：6，他引：19  

陈瑜琦  李秀彬  田玉军  谈明洪 《地理学报(英文版)》2009,19(5):545-556

Based on the data from the Cost-benefit Data of Farm Produce and the China Agricultural Yearbook, this paper divided the intensity of cultivated land use into labor intensity and capital intensity, and then analyzed their temporal and spatial change at both national and provincial levels between 1980 and 2006. The results showed that: (1) At the national level, labor intensity on food produce decreased from 398.5 day/ha in 1980 to 130.25 day/ha in 2006; and a continuous decrease with a steep decline between 1980 and 1986, a slower decline from 1987 to 1996, and another steep decline from 1997 to 2006. On the contrary, capital intensity shows an increasing trend since 1980. As to the internal composition of capital intensity, the proportion of seed, chemical fertilizer and pesticide input decreased from 90.36% to 73.44% and the proportion of machinery increased from 9.64% to 26.56%. The less emphasis on yield-increasing input and more emphasis on labor-saving input are the main reasons for a slow increase of yield per unit area after 1996. (2) At the provincial level, the developed areas have lower labor intensity and higher capital intensity. The less developed ones have higher labor intensity but lower capital intensity. From the viewpoint of the internal composition of capital intensity, labor-saving input accounts for more proportion in the developed areas than that of other areas. The main reason is that in these developed areas, labor input has become a constraint factor in food production as more and more labors engaged in off-farm work. Farmers increase the labor-saving input for higher labor productivity. However, in the less developed areas, the major constraint is the shortage of capital; food production is still depending on labor and yield-increasing inputs.  相似文献   

Structural change of agricultural land use intensity and its regional disparity in China     

CHEN Yuqi  LI Xiubin  TIAN Yujun  TAN Minghong 《地理学报》2009,19(5):545-556

Based on the data from the Cost-benefit Data of Farm Produce and the China Agricultural Yearbook, this paper divided the intensity of cultivated land use into labor intensity and capital intensity, and then analyzed their temporal and spatial change at both national and provincial levels between 1980 and 2006. The results showed that: (1) At the national level, labor intensity on food produce decreased from 398.5 day/ha in 1980 to 130.25 day/ha in 2006; and a continuous decrease with a steep decline between 1980 and 1986, a slower decline from 1987 to 1996, and another steep decline from 1997 to 2006. On the contrary, capital intensity shows an increasing trend since 1980. As to the internal composition of capital intensity, the proportion of seed, chemical fertilizer and pesticide input decreased from 90.36% to 73.44% and the proportion of machinery increased from 9.64% to 26.56%. The less emphasis on yield-increasing input and more emphasis on labor-saving input are the main reasons for a slow increase of yield per unit area after 1996. (2) At the provincial level, the developed areas have lower labor intensity and higher capital intensity. The less developed ones have higher labor intensity but lower capital intensity. From the viewpoint of the internal composition of capital intensity, labor-saving input accounts for more proportion in the developed areas than that of other areas. The main reason is that in these developed areas, labor input has become a constraint factor in food production as more and more labors engaged in off-farm work. Farmers increase the labor-saving input for higher labor productivity. However, in the less developed areas, the major constraint is the shortage of capital; food production is still depending on labor and yield-increasing inputs.  相似文献   

金家堡子地段岩体接触带深部延伸特征     

陈志财  牛禹  谢明宏  高翔  李茂 《铀矿地质》2017,(3):164-169

岩体接触带为金家堡子地段主要的控矿构造,根据其走向与深部分布形态复杂的特征,选择音频大地电磁测深进行了深部地质构造的应用研究,通过资料综合对比分析,基本查明了岩体接触带的深部延伸特征以及与成矿关系密切的岩体凸起的分布范围,为区内铀矿勘查提供了基础资料。  相似文献   

Hydrothermal mineralization on Dengfuxian W-Sn-Pb-Zn orefield, SE China     

XIONG Yiqu  SHAO Yongjun  ZHENG Minghong  ZHOU Haodi  WU Shichong  ZHU Haofeng 《《地质学报》英文版》2017,91(Z1):243-244

<正>1 Introduction Dengfuxian orefield lies at the intersection of the Qin-Hang Combined Zone(QCZ)and the Nanling Metallogenic,and comprises Xiangdong W-Sn deposit(Also known as Dengfuxian W-Sn deposit),Jiguanshi  相似文献   

阿德雷岛企鹅种群分布、繁殖行为及其环境影响因子分析          下载免费PDF全文

孙维萍  蔡明红  王海燕  邢闯  卢冰  H.U. Peter  A.Froehlich 《极地研究》2010,22(1):33-41

2006/2007夏季对南极长城站地区的企鹅种群数量、分布及其繁殖行为进行了生态学调查与研究,共记录到5种企鹅:白眉企鹅、阿德利企鹅、纹颊企鹅、王企鹅和帝企鹅,前3种企鹅在本地区繁殖,后2种为本区旅鸟。阿德雷岛是本地区最重要的企鹅繁殖地,2006/2007南极夏季阿德雷岛上繁殖的企鹅约为9724只,繁殖期后的企鹅总数约为17220只,繁殖成功率为0.40—1.41只/对。通过与历史资料对比,初步分析了近年来在本地区繁殖的企鹅数量与种群结构的变化趋势及其与气候、环境、人类活动的关系。  相似文献   

UV-B短期照射对北极冰川小球藻Chlorella sp.的生物学效应          下载免费PDF全文

彭小伟  何剑锋  罗玮  李运广  蔡明红 《极地研究》2010,22(2):164-173

以一种分离自北极冰川融水的淡水微藻（Chlorella sp.）为实验材料,设置两个不同强度UV-B（45μw/cm2、76μw/cm2）照射处理、每4小时取样检测,对其生化组分进行分析,了解微藻对UV-B辐射的响应。研究结果显示小球藻经辐射处理后,其生化成分发生变化：（1）在较低强度的UV-B（45μw/cm2）辐射下,叶绿素a（Chla）和类胡萝卜素（Car）含量先升后降,且在4h时有最大值;高强度UV-B（76μw/cm2）辐射下,Chla和Car含量随辐射时间延长基本呈下降趋势。（2）超氧阴离子（O2?ˉ）和丙二醛（MDA）含量基本随辐照时间的延长和辐照强度的增大提高,过氧化氢（H2O2）含量变化虽随辐照时间的延长呈上升趋势,但直到12h是才表现为明显的提高。（3）超氧化物歧化酶（SOD）、过氧化氢酶（CAT）活性在低UV-B处理下,随辐照时间的延长呈升高趋势;在高UV-B辐射下,SOD活性先升后降,CAT活性上下波动。(4)UV-B辐射使小球藻脂肪酸组成发生了变化。这些结果表明：UV-B,尤其是高强度或较高剂量的UV-B会对北极冰川微藻带来不利的影响。  相似文献