The traditional dike pond system (DPS) that has been developed and practiced in the Pearl River Delta for centuries is a sustainable agro ecosystem in low lying area. It has an obvious land water interaction and remarkable eco economical effect. In general, a DPS consists of fish ponds surrounded by crop dikes (mulberry, sugar cane, grass, flowers or vegetables). Most of the crops are used to feed the silkworms or livestock (ducks, geese, pigs etc.) and the manure from these animals are added to the po...