检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
出 处:《安徽农业科学》2009年第7期3317-3321,共5页Journal of Anhui Agricultural Sciences
摘 要:宋代的农业自然灾害程度是相当严重的,在时间和空间分布上显示出一些规律和特征,其形成原因分自然因素和人为因素2个方面。自然因素主要是气候环境的变迁和各种灾害之间的互动作用;人为因素主要是过度的农业生产、战争、少数民族的生产方式、手工业的发展、统治阶级奢侈腐化之风对自然环境的破坏等。The agricultural natural disasters in Song Dynasty were very serious and showed some laws and characteristics of time and spatial distribution. The causes of formation were divided into natural factors and human factors. Natural factors included the changes of climatic environment and the interaction among all kinds of disasters. Human factors included the destruction of excessive agricultural production, war, ethnic minority' s production manner, the development of the handicraft industry, the luxury and corruption of the ruling class to the natural environment, and so on.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.117