【摘要】 东北地区经历2次农业开发,辽金时期与清代2次开发之间元、明300多年,东北地区再度恢复为草原或森林草原环境,清代同治、光绪以来的内地移民将农业开发转为持续性的生产活动。全面农业开发之前,东北地区保持以森林、森林草原为主的环境特征,农业开发一步步用农田取代了原有的地理环境,并具有从南部的松辽平原向北部松嫩平原逐步推进的空间特征。更多还原

【Abstract】 Northeast China had experienced two waves of agricultural exploitation separately in the Liao-Jin period and in Qing Dynasty. Between these two periods, vegetation in this area once reverted to grassland or forest in the 300 years of Yuan and Ming Dynasties. While more and more immigrants moved into this region, agriculture gradually became the major subsistence strategy since the Tongzhi-Guangxu period in Qing Dynasty. With continuous farming activities, the original forests and grasslands were replaced by farmlands, which brought significant changes to local natural environment. This replacement first started from the Songliao Plain in the south and inch by inch expanded north to the Songnen Plain.更多还原