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| 2010—2015年中国地级市地膜使用量的时空动态变化特征 |
| Temporal and spatial variations in mulch film usage across prefecture-level cities in China from 2010 to 2015 |
| Received:March 23, 2021 |
| DOI：10.13254/j.jare.2021.0170 |
| 中文关键词: 地膜，时空变化，标准差椭圆，冷热点分析，核密度分析 |
| 英文关键词: mulch film, temporal and spatial variations, standard deviation ellipse analysis, cold and hot spots, nuclear density analysis |
| 基金项目:中国科学院STS计划项目（KFJ-STS-ZDTP-010-03）；中国科学院大学生创新实践训练计划 |
| Author Name | Affiliation | E-mail | | WANG Yanzhi | Changwang School of Honors, Nanjing University of Information Science &
Technology, Nanjing 210044, China
School of Applied Meteorology, Nanjing University of Information Science &
Technology, Nanjing 210044, China | | | FENG Zhaozhong | School of Applied Meteorology, Nanjing University of Information Science &
Technology, Nanjing 210044, China | zhaozhong.feng@nuist.edu.cn |
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| 中文摘要: |
| 地膜具有良好的增墒保温与除草作用，在农业生产过程中发挥重要的作用，但地膜过量使用也带来了农业面源污染和土壤微塑料污染。为在全国尺度上更好地分析我国地膜使用的时空变化，本研究基于2010—2015年全国地级市地膜使用量数据，结合相关农业作物的产量数据，采用空间相关性分析、冷热点区域分析、核密度分析和标准差椭圆分析等方法，分析了全国地级市2010—2015年地膜使用量在全国尺度上的空间与时间变化。结果表明：我国地膜使用量由2010年的118万t持续增加到2015年的145万t，但年增幅逐渐放缓；全局空间相关性分析表明，我国地膜使用一直处于较高的聚集状态，总体呈上升趋势，全局莫兰指数在2015年达到最高值0.627 9。从空间分布来看，2010—2015年我国地膜使用热点主要集中在东部沿海地区和新疆部分地区；而地膜使用量最大的区域主要集中在中西部地区。我国2010—2015年地膜使用量重心向西移动约147 km，揭示我国西部地区地膜使用量逐渐增加。本研究表明，相关部门需着重关注地膜使用量呈现聚集、高密度使用的黄淮海平原、浙东丘陵、珠江三角洲、四川盆地和新疆地区，在这些地区要重点推行地膜回收复用等技术以降低地膜引起的土壤污染风险。 |
| 英文摘要: |
| Mulch film plays a role of growing importance in agricultural production due to its good capacities such as soil moisture retention, temperature increase, and weeding but its overuse can result in serious rural non-point source pollution and soil microplastic contamination. To investigate temporal and spatial variations of mulch film in China, this study conducted different approaches(e.g., spatial correlation, cold and hot spot, kernel density, and standard deviation ellipse analyses)based on data of mulch film usage in prefecturelevel cities and corresponding crop yields from 2010 to 2015. We found that mulch film usage in China increased from 1.18×106 t in 2010 to 1.45×106 t in 2015, but its increase rate decreased during the years. The national spatial correlation analysis revealed that mulch film usage exhibited a relatively high agglomeration state in China with a growing trend and a Global Moran ' s Index reaching 0.627 9 at maximum in 2015. Based on the spatial distribution, most mulch usage mainly occurred at the eastern coastal region of China and parts of the Xinjiang region, while regions with the highest usage rate concentrated to the central and western parts in China. A 147 km westward move could be observed in the focus of mulch usage from 2010 to 2015, indicating a gradual increase in western China. The results suggested that the areas with a high agglomeration state and density of mulch film use(i.e., Huang – Huai – Hai Plain, hills in Zhejiang, Pearl River Delta, Sichuan Basin, and Xinjiang region)should be more concerned, and corresponding technologies(e.g., recycle and reuse of mulch)should be implemented to decrease the mulch-induced soil pollution in these areas. |
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