[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.