东北平原粮食主产区公主岭市种植业系统的能值分析

应用生态经济系统能值分析理论与方法，以东北平原粮食主产区公主岭市为例，通过一系列的能值指标，定量分析了该县主要粮食作物玉米、大豆、水稻系统的能值流动，评价了该县这3种作物系统环境资源基础和经济特征，玉米、大豆和水稻的太阳能值转换率分别为1.95×10⁴、4.98×10⁴和3.59×10⁴。结果表明：大豆的能值最高，水稻次之，玉米最低；总体而言，2002年吉林省公主岭市种植业系统的发展程度相对较高，提高系统的能值投入重点应是提高农业科技含量和可更新有机能值的投入及科学管理力度，才能使公主岭市种植业系统走上持续发展的轨道。

Emergy analysis of planting system at Gongzhuling county in the main grain production region in Northeast China Plain

Based on the emergy theory, this paper quantitatively analyzes the emergy flow of planting system(maize, soybean and rice) in Gongzhuling county in Jilin Province through serial emergy indexes. It figured out the transition rate of solar emergy joules of the three main crops(maize, soybean and rice) in Gongzhuling county, and the results were 1.95×10⁴, 4.98×10⁴, 3.59×10⁴ sej/J, respectively. It evaluated the natural environmental production and society economic development .The results show that the emergy input level of planting system in Gongzhuling county is higher than that in developed countries. The focal point of planting system emergy input is to raise the level of farming technology and increase renewable resource emergy input, especially using agricultural ecological engineering technology and biotechniques, in this way, the agriculture of Gongzhuling county can develop sustainablely.