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学者姓名：涂平
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CONTEXT: Long-term historical information on national -scale grain production is critical for ensuring food security but often limited by the lack of geospatial data. OBJECTIVE: This study aims to conduct the first systematic investigation of grain Cropping Patterns (CP) in China over the past two decades, shedding light on the roles of grain expansion and intensification in sustainable agriculture. METHODS: This study proposes a framework to fully characterize grain production patterns considering crop types, cropping intensity and patterns based on spatiotemporal continuous ChinaCP datasets (2005-2020). Four indicators were developed for measuring the Reality to Capability Ratio (RCR) of grain production regarding the total yield and sow area, the cropland extent and cropping intensity. The capability of grain production was derived based on grain cultivation history. RESULTS AND CONCLUSION: There was a huge gap between the reality and capability of grain production in China, which varied with grain crop types and cropping patterns. At national level, a vast majority (96%) of cropland was capable of grain production, and two fifths of cropland quantified for double grain cropping. However, only 46.65% and 24.89% of the capability was implemented for grain or double -grain cropping in 2020. Maize, rice, and wheat was ever cultivated in 76.88%, 57.05%, and 25.18% of national cropland, respectively. Winter wheat plays an important role in stabilizing grain production by double grain cropping, accounting for 7/8 continuously grain -cultivated areas. However, the RCR of double rice was only 7% in 2020. Bridging these gaps could potentially triple grain production, however, achieving this increase poses challenges due to a series of constraints related to cropland fraction, topographic conditions and lack of agricultural labors along with rapid urbanization. This study found that there was a continuous Northeastward movement & countryside shift in grain production. Continuous support for long-term active agricultural systems is crucial to ensure sustainable grain production in China, with a special emphasis on key grain productive regions, considering targeted cropping patterns and regional disparities. SIGNIFICANCE: This study enhances our understanding of grain production systems in China based on long-term cultivation histories. Findings can inform the development of more geographic -targeted policies concerning grain cropping intensifications to ensure food security and environmental sustainability in developing countries. The long term spatiotemporal continuous CPChina datasets during 2005-2020 was are publicly accessed at: https ://doi.org/10.6084/m9.figshare.25106948.
Keyword ：
China China Cropping patterns Cropping patterns Grain security Grain security Non-grain production Non-grain production Spatiotemporal process Spatiotemporal process
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| GB/T 7714 | Qiu, Bingwen , Jian, Zeyu , Yang, Peng et al. Unveiling grain production patterns in China (2005-2020) towards targeted sustainable intensification [J]. | AGRICULTURAL SYSTEMS , 2024 , 216 . |
| MLA | Qiu, Bingwen et al. "Unveiling grain production patterns in China (2005-2020) towards targeted sustainable intensification" . | AGRICULTURAL SYSTEMS 216 (2024) . |
| APA | Qiu, Bingwen , Jian, Zeyu , Yang, Peng , Tang, Zhenghong , Zhu, Xiaolin , Duan, Mingjie et al. Unveiling grain production patterns in China (2005-2020) towards targeted sustainable intensification . | AGRICULTURAL SYSTEMS , 2024 , 216 . |
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采用Sen趋势分析和Mann-Kendall显著性检验、重力模型、多元线性回归方程、时滞偏相关、残差分析等地理统计方法，分析了黄河流域归一化植被指数（normalized difference vegetation index, NDVI）时空变化特征及其与气候的响应机制，评估了人类活动对NDVI的影响程度，得出以下结论：研究期内，流域内植被NDVI总体呈上升趋势，重心主要分布在流域东南部，东南部的NDVI增速增量明显大于西北部；流域内大部分地区的植被NDVI在生长季是以气温作为主要驱动因子；NDVI在植被生长季对气温的响应主要滞后约1个月，对降水的响应主要滞后约2个月；人类活动对流域内NDVI的影响程度由东南向西北递减，大部分地区的人类活动对植被NDVI起促进作用.
Keyword ：
NDVI NDVI 多元线性回归 多元线性回归 时滞偏相关 时滞偏相关 残差分析 残差分析 趋势分析 趋势分析 重力模型 重力模型 黄河流域 黄河流域
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| GB/T 7714 | 幸利华 , 涂平 , 孙阵阵 . 顾及气候时滞效应的黄河流域NDVI演变归因分析 [J]. | 海南大学学报(自然科学版) , 2024 , 42 (03) : 290-300 . |
| MLA | 幸利华 et al. "顾及气候时滞效应的黄河流域NDVI演变归因分析" . | 海南大学学报(自然科学版) 42 . 03 (2024) : 290-300 . |
| APA | 幸利华 , 涂平 , 孙阵阵 . 顾及气候时滞效应的黄河流域NDVI演变归因分析 . | 海南大学学报(自然科学版) , 2024 , 42 (03) , 290-300 . |
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天文辐射指不考虑大气影响，落于地表的太阳辐射类型，亦是太阳能资源评估的重要背景。火星天文辐射及其时空分布特征的研究会为未来火星的探索提供助力，为火星太阳能资源的精细化利用和高效开发以及政府的科学决策提供基础数据。火星地形地貌错综复杂，其规模形态地球难以比拟，故而无法忽略地形对火星地表天文辐射的影响效果。然而，当下对火星天文辐射的计算和研究并未考虑火星实际地表的遮蔽效应且往往是从局部区域进行的研究。本文考虑纬度差异、时序更替的综合影响，以分辨率200 m的数字高程模型作为基本数据，提出了基于DEM计算火星天文辐射的理论模型，利用Hadoop分布式集群提供的并行计算框架以10 min为一个时间单位精细模拟了考虑地形遮蔽影响的火星全球地表天文辐射空间分布。Rb为水平面天文辐射与考虑地形遮蔽因素的天文辐射之比，一般用于评估天文辐射的地形遮蔽程度。基于全球不同纬度使用Rb进行时空分析，通过有交互的双因素方差分析、因子分析、相关性分析探寻地形因子及天文因素对阴坡和阳坡Rb值的影响程度。结果表明：地形对火星全球地表天文辐射的影响效果在时空尺度上具有明显的规律性，其影响程度不仅与地形自身发展情况（包括地形起伏，坡向，纬度等）有关，还深受正午太阳高度角等天文因素的综合影响。
Keyword ：
地形遮蔽效应 地形遮蔽效应 天文因素 天文因素 天文辐射 天文辐射 数字高程模型 数字高程模型 火星 火星
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| GB/T 7714 | 涂平 , 林偲蔚 , 周千千 et al. 顾及地形影响的火星地表天文辐射时空特征分析 [J]. | 地球信息科学学报 , 2023 , 25 (08) : 1611-1624 . |
| MLA | 涂平 et al. "顾及地形影响的火星地表天文辐射时空特征分析" . | 地球信息科学学报 25 . 08 (2023) : 1611-1624 . |
| APA | 涂平 , 林偲蔚 , 周千千 , 谢静 , 范玉贵 , 陈楠 et al. 顾及地形影响的火星地表天文辐射时空特征分析 . | 地球信息科学学报 , 2023 , 25 (08) , 1611-1624 . |
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Identifying the geographic distribution and erosion risks of various soil erosion regions are critical inputs to the implementation of extensive and effective land protection planning. To obtain more accurate and sufficient erosion information on a large scope, this paper introduced the complex network theory to quantitatively simulate the topographic spatial structure and topological relationship of the erosion area. The watershed was selected as the basic study unit and the directed weighted complex network (DWCN) of each watershed was constructed from DEM data. The directed weighted complex network factor (DWCNF) of each watershed was calculated by the DWCN. After combining DWCNFs with existing SEEF, the soil erosion types and risks of sample areas in the Chinese Loess Plateau were identified by the random forest model. The results show that in both typical and atypical sample areas, the identification performance of soil erosion by combining DWCNFs with existing SEEFs was performed better than that by employing only the DWCNFs or SEEFs dataset. It is suggested that the quantitative description of the spatial structure and topological relationship of the watershed from the perspective of a complex network contributes to obtaining more accurate soil erosion information. The DWCNF of structural entropy, betweenness centrality, and degree centrality were of high importance, which can reliably and effectively identify the types and risks of soil erosion, thus providing a broader factor reference for relevant research. The method proposed in this paper of vectoring terrain into complex network structures is also a novel sight for geological research under complex terrain conditions.
Keyword ：
digital elevation model digital elevation model directed weighted complex network directed weighted complex network directed weighted complex network factor directed weighted complex network factor soil erosion soil erosion soil erosion effective factor soil erosion effective factor
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| GB/T 7714 | Tu, Ping , Zhou, Qianqian , Qi, Meng . Soil Erosion Type and Risk Identification from the Perspective of Directed Weighted Complex Network [J]. | SUSTAINABILITY , 2023 , 15 (3) . |
| MLA | Tu, Ping et al. "Soil Erosion Type and Risk Identification from the Perspective of Directed Weighted Complex Network" . | SUSTAINABILITY 15 . 3 (2023) . |
| APA | Tu, Ping , Zhou, Qianqian , Qi, Meng . Soil Erosion Type and Risk Identification from the Perspective of Directed Weighted Complex Network . | SUSTAINABILITY , 2023 , 15 (3) . |
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Astronomical solar radiation refers to solar radiation that falls on the Earth regardless of the influence of the atmosphere, which is a significant variable for resource assessment of solar energy. Characterizing the spatial- temporal distribution of Martian astronomical solar radiation can help the Martian exploration in the future, providing basic data for detailed utilization and efficient development of solar energy resources on Mars, as well as assistance for the scientific decision- making of governments. However, the Martian terrain is complicated, and its scale and shape are incomparable to those of the Earth. Therefore, it is impossible to ignore the influence of terrain on astronomical solar radiation on the Martian surface. Current studies of the Martian astronomical solar radiation do not consider the terrain shielding effect of the actual surface of Mars and often focus on local areas. In this paper, the comprehensive influence of latitude difference and time sequence replacement is considered. The Digital Elevation Model (DEM) with a resolution of 200 m is taken as the basic data, and a theoretical model for calculating Martian astronomical radiation based on DEM is proposed. The parallel computing framework provided by Hadoop distributed cluster is used to simulate the spatial distribution of astronomical radiation on the Martian global surface, by considering the impact of terrain, and taking 10 minutes as a time unit. The Rb is the ratio between the horizontal astronomical solar radiation and the astronomical solar radiation considering the terrain shielding effect, which is generally used to evaluate the terrain shielding effect of astronomical solar radiation. Based on the mean Rb corresponding to different global latitudes, the spatiotemporal analysis is carried out. Through interactive two-factor analysis of variance, factor analysis, and correlation analysis, the influence extent of terrain factors and astronomical factors on Rb value of shady slope and sunny slope is explored. The results show that the influence of terrain on the Martian surface has obvious regularity at the spatial- temporal scale, and the influence degree is not only related to the development of topography itself, but also affected by astronomical factors such as the height angle of the midday sun. © 2023 Journal of Geo-Information Science. All rights reserved.
Keyword ：
astronomical factors astronomical factors astronomical solar radiation astronomical solar radiation digital elevation model aspect digital elevation model aspect Mars Mars terrain shielding effect terrain shielding effect
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| GB/T 7714 | Tu, P. , Lin, S. , Zhou, Q. et al. Spatiotemporal Characteristics of Astronomical Solar Radiation for Мartian Surface under Terrain Influence; [顾及地形影响的火星地表天文辐射时空特征分析] [J]. | Journal of Geo-Information Science , 2023 , 25 (8) : 1611-1624 . |
| MLA | Tu, P. et al. "Spatiotemporal Characteristics of Astronomical Solar Radiation for Мartian Surface under Terrain Influence; [顾及地形影响的火星地表天文辐射时空特征分析]" . | Journal of Geo-Information Science 25 . 8 (2023) : 1611-1624 . |
| APA | Tu, P. , Lin, S. , Zhou, Q. , Xie, J. , Fan, Y. , Chen, N. et al. Spatiotemporal Characteristics of Astronomical Solar Radiation for Мartian Surface under Terrain Influence; [顾及地形影响的火星地表天文辐射时空特征分析] . | Journal of Geo-Information Science , 2023 , 25 (8) , 1611-1624 . |
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土地覆盖变化影响局域的能源和水平衡，并在全球范围内促进碳的净排放。基于欧空局气候变化倡议项目最新发布的1992年—2015年300 m分辨率的全球土地覆盖数据集，本文分析了1992年—2015年“一带一路”沿线主要土地覆盖类型变化的时空特征及其驱动力。研究结果表明：1992年—2015年沿线耕地、草地和建设用地面积分别增加190.00×10~3km~2、57.97×10~3km~2和260.39×10~3km~2，森林、灌木、湿地和水体面积分别减少61.14×10~3km~2、34.22×10~3km~2、74.28×10~3km~2和44.41×10~3km~2。2000年—2015年与19...
Keyword ：
“一带一路”沿线 “一带一路”沿线 土地覆盖变化 土地覆盖变化 时空特征 时空特征 遥感 遥感 驱动力 驱动力
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| GB/T 7714 | 海凯 , 王思远 , 涂平 et al. “一带一路”沿线国家1992年—2015年土地覆盖变化的时空格局及其驱动力分析 [J]. | 遥感学报 , 2022 , 26 (06) : 1220-1235 . |
| MLA | 海凯 et al. "“一带一路”沿线国家1992年—2015年土地覆盖变化的时空格局及其驱动力分析" . | 遥感学报 26 . 06 (2022) : 1220-1235 . |
| APA | 海凯 , 王思远 , 涂平 , 杨瑞霞 , 马元旭 , 梁娟珠 et al. “一带一路”沿线国家1992年—2015年土地覆盖变化的时空格局及其驱动力分析 . | 遥感学报 , 2022 , 26 (06) , 1220-1235 . |
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The Loess Plateau is the largest gully geomorphic region in the world, characterized by the most intense soil erosion in a typical loess-covered area. Previous studies have focused on the terrain and texture of this region; however, there have been no systematic studies on the gully spatial structure of the Loess Plateau. Therefore, the present study investigated the characteristics and spatial distribution of landform spatial structure over the Loess Plateau. Specifically, gully weighted complex networks (GWCNs) were applied to simulate the gully spatial structure of loess landforms, and a series of quantitative indices were introduced to delineate these. Using 57 geomorphological units uniformly distributed across the Loess Plateau as test areas and six typical loess landforms as sample areas, GWCNs were constructed, and using these GWCNs, the spatial structure and internal mechanisms of typical loess landforms were explored. From a series of fresh insights, such as the regional scale-free distribution, homologous structure, tightness, community effect, connectivity, stability, and complexity, regular variations in quantitative indices delineate the spatial distribution of the characteristics of landform spatial structure over the plateau. Moreover, the spatial distribution of complex network indices exhibited strong spatial coupling with loess landforms. Overall, GWCNs could be effectively used for landform recognition and performed well. In conclusion, these experimental results suggest that introducing complex networks into landform studies can offer novel insights into landform quantitative analyses. The present work is of great significance, as it proposes a new methodology for describing the spatial structure and terrain features of landforms in quantitative analyses and furthers our understanding of landform genesis.
Keyword ：
complex network complex network DEM DEM digital terrain analysis digital terrain analysis geomorphology geomorphology Loess Plateau Loess Plateau terrain feature terrain feature
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| GB/T 7714 | Lin, Siwei , Chen, Nan , Qianqian, Zhzou et al. Quantitative analysis and spatial distribution of landform spatial structure on Loess Plateau [J]. | PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT , 2022 . |
| MLA | Lin, Siwei et al. "Quantitative analysis and spatial distribution of landform spatial structure on Loess Plateau" . | PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT (2022) . |
| APA | Lin, Siwei , Chen, Nan , Qianqian, Zhzou , Feng, Qiu , Jing, Xie , Meng, Qi et al. Quantitative analysis and spatial distribution of landform spatial structure on Loess Plateau . | PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT , 2022 . |
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Taxi travel flow patterns and their interday stability play an important role in the planning of urban transportation and public service facilities. Existing studies pay little attention to the stability of the travel flow patterns between days, and it is difficult to consider the impact of dynamic changes in daily travel demand analysis when supporting related decision making. Taxi trajectory data have been widely used in urban taxi travel-pattern analysis. This paper uses the taxi datasets of Shenzhen and New York to analyze and compare the interday stability of the taxi travel spatial structure and the flow volume based on the improved Levenshtein algorithm and geographic flow theory. The results show that (1) interday differences in taxi travel flow are obvious in both spatial structure and flow volume, high-frequency origin-destination (OD) trips are relatively stable; (2) the ODs between the central urban area and surrounding areas exhibit high traffic volume and high interday stability, and the ODs starting or ending at an airport exhibit high traffic stability; (3) one week's data can describe 86% of the overall travel structure and 84% of travel flow in Shenzhen, and one week's New York data can describe 73% of travel structure and 76% of travel flow. There are differences in the travel patterns of people in different cities, and the representativeness of datasets in different cities will be different. These findings can help to better understand the outcomes of taxi travel patterns derived from a relatively short period of data to avoid potential misuse in related decision making.
Keyword ：
human mobility human mobility interday stability interday stability origin-destination similarity origin-destination similarity taxi trajectory data taxi trajectory data travel structure travel structure
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| GB/T 7714 | Tu, Ping , Yao, Wei , Zhao, Zhiyuan et al. Interday Stability of Taxi Travel Flow in Urban Areas [J]. | ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION , 2022 , 11 (12) . |
| MLA | Tu, Ping et al. "Interday Stability of Taxi Travel Flow in Urban Areas" . | ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION 11 . 12 (2022) . |
| APA | Tu, Ping , Yao, Wei , Zhao, Zhiyuan , Wang, Pengzhou , Wu, Sheng , Fang, Zhixiang . Interday Stability of Taxi Travel Flow in Urban Areas . | ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION , 2022 , 11 (12) . |
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Land Use/Cover Change (LUCC) impacts local energy and water balance and promotes a net carbon emission to the atmosphere globally. Based on the latest released annual ESA Climate Change Initiative (CCI) global land cover dataset, which provides long time sequenced land cover changes at 300 m resolution from 1992 to 2015, the spatio-temporal characteristics and driving forces of major land cover change along the Belt and Road Initiative were analyzed. Results indicated that cropland, grassland, and built-up land increased by 190.00×103 km2, 57.97×103 km2, and 260.39×103 km2, respectively, whereas forest, shrub, wetland, and water decreased by 61.14×103 km2, 34.22×103 km2, 74.28×103 km2, and 44.41×103 km2, respectively. In addition, the spatial patterns of land cover changes during 2000—2015 in the Belt and Road Initiative was consistent with that of the period 1992—2000. However, some new characteristics of land cover changes emerged in different regions of the Belt and Road Initiative in 2000—2015. The rates of built-up land expansion and forest loss increased in Southeast Asia, whereas the rates of cropland growth and shrub loss decreased significantly. The built-up land continued to expand at a high speed, and the area of grassland increased in East Asia, whereas the area of cropland continued to decrease, and the rate of forest loss has dropped significantly. The expansion rate of built-up land decreased in Central and Eastern Europe, whereas the rate of cropland shrinkage accelerated. In Russia, built-up land expansion slowed down continually, and forest area increased slightly. In addition, the growth rates of grassland and shrub decreased in Russia. The analysis further shows that population growth, climate change, socio-economic development, and government-related policies are the main drivers of land cover change in countries along the Belt and Road Initiative. © 2022 National Remote Sensing Bulletin. All rights reserved.
Keyword ：
Climate change Climate change Economics Economics Expansion Expansion Forestry Forestry Land use Land use Population statistics Population statistics Remote sensing Remote sensing Roads and streets Roads and streets
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| GB/T 7714 | Hai, Kai , Wang, Siyuan , Tu, Ping et al. Spatio-temporal patterns and driving forces of recent 1992—2015 land cover change in countries along the Belt and Road Initiative [J]. | National Remote Sensing Bulletin , 2022 , 26 (6) : 1220-1235 . |
| MLA | Hai, Kai et al. "Spatio-temporal patterns and driving forces of recent 1992—2015 land cover change in countries along the Belt and Road Initiative" . | National Remote Sensing Bulletin 26 . 6 (2022) : 1220-1235 . |
| APA | Hai, Kai , Wang, Siyuan , Tu, Ping , Yang, Ruixia , Ma, Yuanxu , Liang, Juanzhu et al. Spatio-temporal patterns and driving forces of recent 1992—2015 land cover change in countries along the Belt and Road Initiative . | National Remote Sensing Bulletin , 2022 , 26 (6) , 1220-1235 . |
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以广东省2010-2019年中分辨率成像光谱仪(MODIS)气溶胶产品为数据源,对广东省近10 a的气溶胶光学厚度(AOD)进行时空演变趋势探索和空间异质性分析.通过历史空气质量监测数据,筛选出东莞市典型气溶胶粒子污染事件,并对其进行3个高度上的大气污染物72 h后向轨迹分析.结果表明:在时间上,近10 a广东省气溶胶变化总体上呈现下降和不变的趋势;而在空间上,主要呈现"北低南高"的分布特征,自相关性显著.后向轨迹表明,广东省所受到的大气污染源自不同的高度层,受到台风和季风的影响,以及受到海洋和陆地气溶胶共同作用.
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| GB/T 7714 | 牟维 , 涂平 , 梁娟珠 . 广东省气溶胶时空演变及后向轨迹分析 [J]. | 华侨大学学报（自然科学版） , 2021 , 42 (6) : 800-808 . |
| MLA | 牟维 et al. "广东省气溶胶时空演变及后向轨迹分析" . | 华侨大学学报（自然科学版） 42 . 6 (2021) : 800-808 . |
| APA | 牟维 , 涂平 , 梁娟珠 . 广东省气溶胶时空演变及后向轨迹分析 . | 华侨大学学报（自然科学版） , 2021 , 42 (6) , 800-808 . |
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