id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-299884-wp4ehemj	Chen, Ray Zhuangrui	Integrated wetlands for food production	2016-07-31		.txt	text/plain	11818	548	43	Apart from excessive nutrients such as nitrogen and phosphorus, which can cause eutrophication in water, elevated concentrations of a wide range of persistent toxic substances (PTS), including heavy metals (such as mercury (Hg), chromium (Cr), lead (Pb)), persistent organic pollutants (POPs such as DDT) and certain emerging chemicals of concern (such as flame retardants) found in soil, water and air worldwide during the past decades, are greatly threatening our food production and food safety. Similar to rice-fish farming, rice-duck, rice-crab, rice-prawn farming makes use of the symbiotic relationship between paddy fields and animals to more effectively utilize nutrients and energy, reduce chemical fertilizer and pesticide inputs, increase food safety and productivity, and also mitigate the pollutants discharge Zhang et al., 2001; Zhen et al., 2004) . Integrated wetland techniques (such as hydroponic, constructed treatment wetland or floating island) with food production processes, coupled with polyculture of different fish species or other organisms (such as ducks, crabs, shrimps, and etc.), are able to promote ecosystem health, and achieve sustainability, mainly via its wastewater purification and nutrient recycling capability.	./cache/cord-299884-wp4ehemj.txt	./txt/cord-299884-wp4ehemj.txt