DOI：10.31220/agriRxiv.2021.00086

Using aquatic animals as partners to increase yield and soil nitrogen in the paddy ecosystem.

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  Abstract: Abstract Whether species coculture can overcome the shortcomings of crop monoculture requires additional study. Here, we show how aquatic animals (i.e., carp, crabs, and soft-shelled turtles) benefit paddy ecosystems when cocultured with rice. Three separate field experiments and three separate mesocosm experiments were conducted. Each experiment included a rice monoculture (RM) treatment and a rice-aquatic animal (RA) coculture treatment. In the field experiments, rice yield was higher with RA than with RM, and RA also produced aquatic animal yields that averaged 0.85-2.66 t ha -1 . Compared to their corresponding RM, the three RAs had significantly higher apparent nitrogen (N)-use efficiency and lower weed infestation, while soil N contents were stable. Dietary reconstruction analysis based on 13 C and 15 N showed that 16.0-50.2% of aquatic animal foods were from naturally occurring organisms in the rice fields. Stable-isotope-labeling ( 13 C) in the field experiments indicated that the organic matter decomposition rate was greater with RA than with RM. Isotope 15 N labeling in the mesocosm experiments indicated that rice used 13.0-35.1% of the aquatic animal feed-N. All of these results suggest that rice-aquatic animal coculture increases food production, increases N-use efficiency, and maintains soil N content by reducing weeds and promoting decomposition and complementary N use. Our study supports the view that adding species to monocultures may enhance agroecosystem functions.

  Key words: rm; rice; ra; coculture; aquatic; separat

  提交时间：2021-01-01

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