东北地区典型农区土地利用变化对农业扩张和气候变化的响应研究

大规模的农业扩张和全球气候变化导致东北地区发生剧烈的土地利用/土地覆盖变化。本研究分析了研究区1976—2008年的土地利用变化和生长季各月气温的变化趋势,并结合农业扩张程度,探究LUCC对农业扩张和气候变化的响应,为指导农业发展规划和保障国家粮食安全提供理论依据。结果表明,1976—2008年农田面积逐步增加,生长季气温一直呈上升趋势。1976—2001年生长季气温的上升趋势不稳定,气温变化程度较大;2001—2008年,农业扩张放缓,生长季气温上升趋势显著,且上升趋势一直增加,气温变化比上一时期更稳定;且这两个时期农业扩张和气候变化对土地利用强度的影响在南北和东西方向上均存在明显差异。

Response of the Land Use Change to Agricultural Expansion and Climate Change in Typical Agricultural Areas of Northeast China

Large-scale agricultural expansion and global climate change lead to drastic Land Use and Land Cover Change in northeast China. This paper analyzed the land use change and monthly temperature change trend of growing season in research area from 1976 to 2008. Combined with agricultural expansion degree, the paper explored the response of LUCC to the agricultural expansion and climate change, and provided a theoretical basis for guiding agricultural development planning and national food security. The results showed that the farmland area gradually increased, and the temperature of growing season has been on the rise from 1976 to 2008. The rising trend of growing season temperature was not stable, and the temperature fluctuated greatly from 1976 to 2001. The agricultural expansion was slowed down, and the rising trend of growing season temperature has been increased from 2001 to 2008, and the temperature change was more stable than the previous period. The impact on land use intensity of agricultural expansion and climate change was obviously different in north-south and east-west direction in the two periods.