通讯机构：
[Chun Li; Xingyao Xiong] A;Authors to whom correspondence should be addressed.<&wdkj&>Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China<&wdkj&>College of Horticulture, Hunan Agricultural University, Changsha 410128, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>College of Information and Intelligence, Hunan Agricultural University, Changsha 410128, China
关键词：
plant community color;autumn color;color characteristic;aesthetic preference;scenic beauty estimation (SBE);principal component analysis (PCA);urban park
摘要：
Contemporary landscape architecture studies have paid close attention to the interactions between public aesthetic preferences and the landscape environment. Scenic beauty has become an important evaluation indicator of landscape quality. The quality of the plant color landscape is an important factor affecting scenic beauty. Exploring the relationship between the composition rules and internal properties of autumn plant color landscapes in urban parks and public aesthetic preferences can provide new ideas for the evaluation and design of plant community color landscapes. Taking 12 parks in Changsha City, Hunan Province, China, as the study area and 85 plant communities as the sample plots, scenic beauty estimation (SBE) was used to evaluate the autumn plant color landscape of urban parks. ColorImpact software was used to extract the color values of each plant community. Fifteen original color element indicators were determined, and the data were statistically analyzed by principal component analysis (PCA), one-way ANOVA, multiple comparison analysis and systematic cluster analysis. Four principal components were extracted to construct the characteristic indices and a comprehensive model of the color landscape quality of autumn plant communities. The four characteristic indices showed significant or extremely significant differences among the five SBE grades. From the overall trend, the SBE grades showed a positive correlation with PC1 (primary and adjunctive color index), PC2 (color structure and property index) and PC3 (autumn-color-leafed index) and a negative correlation with PC4 (intersperse color index). R-PH (ratio of primary hue), R-P (ratio of primary color), R-C (color-leafed index), R-WC (ratio of warm and cool colors), and N-C (number of colors) were the key factors affecting the SBE grade. Overall, R-PH, R-P, R-C, and R-WC positively influenced the SBE values, while N-C negatively influenced the SBE values, and five to seven colors were more moderate. The quality of the color landscape can be improved by creating plant communities with three types of color composition: warm-toned dominant type, warm- and cold-toned contrast type, and multicolor harmonic type. The results provide a reference for the evaluation, design and construction of autumn plant color landscapes in urban parks.
期刊：
ISPRS International Journal of Geo-Information,2023年12(1):3- ISSN：2220-9964
通讯作者：
Hui Tang
作者机构：
[Tang, Hui; Xu, Tao; Xiong, Yajun] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Tang, Hui] Hunan City Univ, Sch Architecture & Urban Planning, Yiyang 413000, Peoples R China.
通讯机构：
[Hui Tang] S;School of Architecture and Urban Planning, Hunan City University, Yiyang 413000, China<&wdkj&>College of Urban and Environmental Science, Central China Normal University, Wuhan 430079, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
Yellow River Basin urban agglomeration;high-speed railway access pattern;overlapping community model;spatial overlap delineation;overlapping space identification
摘要：
With the rapid development of high-speed railway (HSR) transportation in China, its impact on regional spatial patterns and shaping has become increasingly significant. This study took seven urban agglomerations in the Yellow River Basin as the research object, using the 2 h HSR access time in the Yellow River Basin to comparatively analyze the differences in HSR access in the urban agglomeration in the Yellow River Basin, and using the 3 h HSR access to central cities as the background to conduct regional division and overlapping space identification through cross-regional economic links, before finally selecting the overlapping city of Changzhi for long-term space development strategic planning. The main conclusions were as follows: First, the low-value area of HSR travel time in the Yellow River Basin urban agglomerations was biased toward the center of the urban agglomerations, while the peripheral areas were relatively high-value travel traffic circles, and the HSR travel time showed a circular spatial pattern characteristic of continuous expansion from the center to the peripheral areas. Four urban agglomerations in the upper reaches of the city achieved a 2 h access pattern within the urban agglomeration, whereas three urban agglomerations in the middle and lower reaches of the city only reached the 2 h access level in the center. Second, the Yellow River Basin was divided into six community spaces using the SLPA model based on the economic linkage between the central city and other cities, which were filtered by the 3 h access time from the central city to each city for HSR travel. Three of the six communities produced overlapping spaces, i.e., Community 3 and Community 4 produced overlapping spaces containing Linfen, Community 3 and Community 5 produced overlapping spaces containing Changzhi, Handan, and Xingtai, and Community 4 and Community 5 produced overlapping spaces containing Yuncheng and Sanmenxia. Third, the overlapping space of Changzhi City was selected as a case study for a visionary strategic planning outlook. Combining the geographic location characteristics and future development opportunities of Changzhi, we can try to transform a pass-through node like Changzhi into a hub node in the future, strengthening the gateway status and expanding the hinterland. According to the results of the research and analysis, policymakers can try to implement the expansion and renovation of HSR trunk lines, break the transportation bottlenecks in less developed areas, improve the coverage of the HSR network, and establish a "cross-urban agglomeration" cooperation and coordination mechanism.
作者机构：
School of Architecture and Urban Planning, Hunan City College, Yiyang, China;School of Architecture and Planning, Hunan University, Changsha, China;Key Laboratory of Digital Urban and Rural Spatial Planning Key Technology of Hunan Province, Yiyang, China;School of Urban and Environmental Sciences, Huazhong Normal University, Wuhan, China;[Yu Chen] School of Architecture and Urban Planning, Hunan City College, Yiyang, China<&wdkj&>School of Architecture and Planning, Hunan University, Changsha, China<&wdkj&>Key Laboratory of Digital Urban and Rural Spatial Planning Key Technology of Hunan Province, Yiyang, China
关键词：
built environment;entropy Topsis method;health & safety;space health evaluation;town & city planning;urban renewal
摘要：
Healthy street space is crucial for public health and promoting urban renewal in old areas. In 2021, China’s urbanisation reached 65.22% according to the Development and Reform Commission of People’s Republic of China (2023). Rapid urbanisation has led to problems and public health events in old urban areas that threaten residents’ safety and health. Addressing health issues is a major problem challenge in urban renewal. This paper, an index system for evaluating the health of urban streets through empirical research. The authors conducted a preliminary study on data acquisition scope and established an index system with eight main and 15 secondary indicators. The authors determined the weight of each indicator by consulting experts, residents and tourists and using an information entropy-based weight allocation method. The authors then conducted an empirical study of the Dongmenkou area in Yiyang City. The results show that the street space in Dongmenkou district has issues with inappropriate street width, inadequate street greening, poor night-time safety, and uneven facility distribution. The authors suggest improving the street scale, environment and facilities.
期刊：
Environmental Science and Pollution Research,2022年29(10):14083-14097 ISSN：0944-1344
通讯作者：
Li, Feng
作者机构：
[Chen, Xinsheng; Geng, Mingming; Deng, Zhengmiao; Zou, Yeai; Li, Feng; Wang, Kelin; Xie, Yonghong] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China.;[Chen, Xinsheng; Geng, Mingming; Deng, Zhengmiao; Zou, Yeai; Li, Feng; Xie, Yonghong] Chinese Acad Sci, Inst Subtrop Agr, Dongting Lake Stn Wetland Ecosyst Res, Changsha 410125, Peoples R China.;[Geng, Mingming] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Niu, Yandong] Hunan Acad Forestry, Changsha 410004, Peoples R China.;[Qian, Zhan; Liao, Xiaohong] Hunan Hydro & Power Design Inst, Dongting Lake Res Ctr, Changsha 410007, Peoples R China.
通讯机构：
[Li, Feng] K;Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, People's Republic of China.;Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, People's Republic of China.
关键词：
Water quality;Water level;Comprehensive pollution index;Dongting Lake
摘要：
The effects of cadmium (Cd) and acid rain on the growth of bermudagrass were studied by hydroponic experiment. This study was divided into two separate experimental groups. In the first one, we treated plants only with Cd; in the second, we treated plants with Cd and acid rain. The results showed that the growth of bermudagrass was inhibited by acid rain and higher concentration of Cd. The chlorophyll content (SPAD) of compound treatment plants was significantly lower than that of single treatment with the same Cd concentration, while the malondialdehyde (MDA) content was higher than that of the single treatment. Acid rain aggravated the toxic effect of Cd on bermudagrass. In this experimental treatment, the superoxide dismutase (SOD) activity of the plants treated with Cd and acid rain was always higher than that of the plants treated with Cd alone. The peroxidase (POD) and catalase (CAT) activities of the combined treatment plants increased at low Cd concentration. It showed that SOD plays a major role in anti-oxidation defense. Under higher Cd concentration, the contents of soluble protein, soluble sugar, and free amino acid in plants treated with Cd and acid rain were higher than those treated with Cd alone. The treatment of 1 mg/L Cd and pH4.5 acid rain caused the most serious harm to bermudagrass. Bermudagrass had a certain tolerance to the combined stress of Cd and acid rain. The results provide a theoretical basis for remediation of soil Cd pollution in acid rain area.
