基塘农业生态工程模式的能值评估

应用能值分析方法及最新推出的评价系统可持续发展能力的能值指标(EISD)，分别对珠江三角洲三水市的3种基塘农业生态工程模式进行了系统层和子系统层的能值比较研究。结果表明，模Ⅲ的可持续发展性能最强，其EISD比模式Ⅰ、Ⅱ分别高出58．3％和29．7％；种植业子系统经济效益好，但环境压力大。是模式内可持续发展性最差的子系统；畜牧业子系统生产环效果不佳，但增益环效果明显；渔业子系统经济效益好，环境压力小。是系统内可持续发展性最强的子系统。引入翘嘴鳜的生态经济边际效益显著。

Energy value evaluation of dike-pond agro-ecological engineering modes

In this paper, energy value analysis and new energy index for sustainable development (EISD) were used to evaluate three different dike-pond agro-ecological engineering modes in Sanshui city of Pearl River Delta in system and subsystem levels. The result showed that mode III was the best in its sustainable development ability. The EISD of mode III was 58.3% and 29.7% higher than that of modes I and II. With a higher economic benefit and higher environmental loading, the planting subsystem had the lowest sustainability. Although the economic benefit of stock raising subsystem was not high, its indirect benefit was higher. With a higher economic benefit and a lower environmental loading, fishing subsystem had the highest sustainability.