南方红壤侵蚀区农业生态系统的能值分析

应用能值分析的理论与方法，对福建省长汀县农业生态系统的能值流进行了定量分析。根据长汀县农业生态系统的情况选择了能值投资率、净能值产出率、环境承载力、可持续发展指数、系统生产优势度及系统稳定性指数等10个指标进行分析，其中净能值产出率为11.40、能值投资率为1.91、环境承载力为2.21、可持续发展指数为19.10、系统生产优势度为0.53以及系统稳定性指数为0.90。结果表明：该县处于传统农业向现代农业转变的过渡阶段，系统能值投入水平和转化效率较低。为了促进长汀县农业的可持续发展，应调整能值投入结构，逐步提高石化能源的利用效率，并增大农业科技的研究和推广力度，增加农业生态系统的产出能力。

Energy Analysis of Agro-ecological System in Red Eroded Soil of South China

The Energy flows of agro-ecological system were analyzed quantitatively in Changting County of Fujian Province by using the theory and methods of Energy analysis. The 10 Energy indices, including Energy yield ratio (EYR), Energy investment ratio (EIR), environment carrying capacity (ECC), Energy—based sustainability index(ESI), system dominant degree (SDD) and system stability degree (SSD) are analyzed．EIR, EYR, ECC, ESI, SDD, SSD was 1.91, 11.40, 2.21, 19.10, 0.53 and 0.90 respectively in 2005. The result showed that this region is in the stage of transformation from traditional agriculture to modern agriculture. In order to promote the sustainable development of agriculture in the region, suitable measures should be taken, that is, to regulate the input in agriculture, to increase utilization ratio, to stimulate academic research, and to improve the productivity of agricultural economic systems.