Current Situations and Future Development Trend of Farmland Pre-warning Researches in China

This paper summarized theory discussion,main research methods,contents,empirical and engineering researches of farmland prewarning in China.It stated that future researches of farmland pre-warning in China will focus on deepening application of farmland security prewarning models,revealing mechanism of changes in different farmland resources,establishing pre-warning models suitable for research areas,accurate evaluation and prediction of farmland security,and exploring establishing and improving farmland security monitoring system and operating mechanism of all levels.

俄罗斯新冠肺炎疫情的扩散:过程、格局与影响因素研究

遵循过程-格局-机理的脉络,结合每日新增病例、累计确诊病例、治愈量、死亡量等分析俄罗斯新冠肺炎疫情的发展过程,利用空间自相关分析研究俄新冠肺炎疫情的格局变化,基于多元线性回归分析探讨俄新冠肺炎疫情扩散的影响因素。研究发现:自2020年1月31日俄罗斯出现首例确诊病例以来,俄新冠肺炎疫情经历了平稳偶发、迅速暴发和扩散、扩散衰退、严重扩散等4个阶段,其治愈量保持稳定上升态势,死亡率徘徊于2%。人口规模、经济发展、医疗水平、交通设施等是影响俄罗斯新冠疫情扩散的重要因素,空间上,俄新冠肺炎疫情扩散表现为早期的多点扩散到后期的全面扩散,以及以莫斯科市为中心的邻近扩散、迁移扩散、廊道扩散的“由西到东”格局特征,与此同时,俄内部疫情也表现出一定的空间集聚性,莫斯科市、莫斯科州、圣彼得堡市、下诺夫哥罗德州、斯维尔德洛夫斯克州、汉特-曼西自治区、罗斯托夫州、克拉斯诺亚尔斯克边疆区等是疫情重灾区。最后总结了新冠肺炎疫情下的中俄未来合作发展对策与建议。