作者机构:
[Liu, Ji; Liu, Muxing; Zhang, Hailin; Yi, Jun] Key Lab Geog Proc Anal & Simulat, Wuhan 430079, Hubei, Peoples R China.;[Liu, Ji; Wang, Qiuyue; Liu, Muxing; Zhang, Hailin; Yi, Jun] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Hu, Wei] New Zealand Inst Plant & Food Res Ltd, Private Bag 4704, Christchurch 8140, New Zealand.
通讯机构:
Key Laboratory for Geographical Process Analysis & Simulation, Hubei Province, Wuhan, China
关键词:
Volumetric soil water content;Wavelet analysis;Significant coherence area;Time scale;Vegetation type;Slope position
摘要:
Clarifying the mechanisms governing volumetric soil water content (VSWC) dynamics in soil profiles is essential, as it can help to elucidate soil water transport processes and improve the prediction accuracy of soil hydrological processes. Using Spearman's rank correlation and wavelet coherence analysis methods, similarity in soil profile VSWC dynamics and factors governing VSWC soil profile dynamics in upslopes and downslopes under three vegetation types (evergreen forest [EG], secondary deciduous forest mixed with shrubs [SDFS], and deforested pasture [DP]) at different time scales (hourly, daily, weekly, and monthly) and in different seasons were analyzed. The results revealed significant similarity in the VSWC of different soil depths (P < 0.01), with the similarity decreasing in accordance with the increment in soil depth. Greater VSWC similarity was found in EG than SDFS and DP sites and in upslope than downslope areas at both forest sites. The average significant coherence area (SCA) of VSWC similarity among surface and deep soil layers varied with the time scale, which was in the order of monthly (58.6%) > weekly (42.8%) > daily (21.8%). The effects of soil properties (e.g., texture, saturated hydraulic conductivity), rainfall, and potential evapotranspiration (ETp) on VSWC similarity were related to the time scale and season in which VSWC monitoring took place. Soil properties had apparent effects on VSWC similarity at longer time scales (i.e., monthly), with a high SCA. In contrast, the effects of rainfall and ETp on VSWC similarity were concentrated at weekly and daily scales, with a relatively low SCA. Rainfall and ETp dominated VSWC dynamics in the summer and fall, respectively. These results imply the use of measured VSWC at one soil depth to predict the VSWC at other soil depths was a reliable method. While the in-fluence of time scale effects and seasonal variations on prediction accuracy of VSWC should be considered. ](c) 2022 International Research and Training Center on Erosion and Sedimentation, China Water and Power Press, and China Institute of Water Resources and Hydropower Research. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY -NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
作者机构:
[Xueling, Tan; Hu, Yu] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China.;[Yinhe, Li; Xueling, Tan] Yanbian Univ, Sch Geog & Ocean Sci, Yanbian, Peoples R China.;[Yajuan, Li] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan, Peoples R China.
通讯机构:
[Yu Hu] I;Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
关键词:
Glocalization;food cultural space;production;reconstruction;China
摘要:
This study constructs a theoretical framework for the production and reconstruction of food cultural space from a glocalization perspective. Through a qualitative analysis, we analyse the practice and representation of food cultural space in Yanji City. The results show that food cultural spaces have evolved from commercial residential to open urban leisure consumption spaces through a leap from a quantitative to a qualitative change.It integrates fashionable cultural consumption elements into the optimisation and expression of urban space extension, thus achieving the spatial image of symbolic communication. As the representational space of residents’ daily life, the evolution of food cultural space is accompanied by capital multiplication, power cultivation, and class mobility, which play an important role in promoting urban space expansion and social structure renewal. The results enrich the research on food cultural space under the background of glocalisation and provide a reference for the sustainable development of urban cultural space.
作者:
Zheng, Jiangpeng;Huang, Zhou;Zhou, Xiao;Scheuer, Bronte;Wang, Han
期刊:
Sustainable Cities and Society,2023年99:104976 ISSN:2210-6707
通讯作者:
Huang, Z
作者机构:
[Huang, Zhou; Zheng, Jiangpeng; Huang, Z; Scheuer, Bronte] Peking Univ, Inst Remote Sensing & Geog Informat Syst, Sch Earth & Space Sci, Beijing 100871, Peoples R China.;[Huang, Zhou; Zheng, Jiangpeng; Scheuer, Bronte] Peking Univ, Beijing Key Lab Spatial Informat Integrat & Its Ap, Beijing 100871, Peoples R China.;[Zhou, Xiao] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan 430079, Peoples R China.;[Wang, Han] Univ Hong Kong, Fac Architecture, Div Landscape Architecture, Future Urban & Sustainable Environm FUSE Lab, Hong Kong, Peoples R China.
通讯机构:
[Huang, Z ] P;Peking Univ, Inst Remote Sensing & Geog Informat Syst, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
关键词:
CO2 emissions;Bus smart card;Spatiotemporal characteristics;Per person-kilometer;Emission reduction potential
摘要:
Human activities, primarily carbon dioxide emissions, have undeniably caused global warming. The transportation sector contributes about a quarter of global CO2 emissions. While replacing traditional buses with electric ones has reduced emissions, it is crucial to consider the indirect emissions resulting from electricity consumption. This study proposes a framework for modeling bus emissions using smart card data, integrating spatiotemporal distribution characteristics and emission reduction potentials. Our analysis reveals that routes spanning 10-30 km contribute to 81% of total bus emissions, with an average emission rate of 56.2 gCO2/per-km for residents traveling by bus. Bus emissions also exhibit cyclical variations during holidays, weekdays, and weekends, indicating spatial clustering and trends. Although the area within Beijing's 4th Ring Road constitutes only 13% of the total area within the 6th Ring Road, it generates almost half of the CO2 emissions. With urban expansion, total bus emissions increase gradually, but emission intensity decreases. This study emphasizes the potential for reducing emissions through improved public transportation operations. It recommends fully electrifying the bus fleet and employing low grid emission factors, which could reduce emissions by up to 71% compared to diesel options. Electrification of buses and optimizing power generation on the grid are essential priorities for emission reduction.