Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, 201403, China.
Sci Rep. 2020 Sep 9;10(1):14818. doi: 10.1038/s41598-020-71884-0.
Recently, many new rice-fish co-culture models have been developed to increase economic and ecological benefits. In this study, we added eels (Monopterus albus) to a rice-crayfish system and conducted a 3-year field investigation to compare the yields and availability of fertilizer N among groups with a low density of eels, high density of eels and no eels. We performed a mesocosm experiment and used an isotope tracer technique to detect the fate of fertilizer N. The results showed that the rice yields significantly improved after the introduction of the eels. However, the introduction of a high density of eels significantly limited the crayfish yield, increased water N and NO emissions and decreased soil N content. The mesocosm experiment suggested that the use efficiency of fertilizer N was significantly increased after the introduction of the eels. The fertilizer N used by rice was significantly higher in rice-crayfish-eel system than in rice-crayfish system. This study indicated that the introduction of eels may be a good practice for improving yields and availability of fertilizer N in a rice-crayfish system.
最近，开发了许多新的稻鱼共作模式，以提高经济效益和生态效益。在这项研究中，我们在稻-小龙虾系统中添加了鳗鱼（Monopterus albus），并进行了为期 3 年的野外调查，以比较低密度、高密度和无鳗鱼组的肥料 N 的产量和有效性。我们进行了中观实验，并使用同位素示踪技术来检测肥料 N 的去向。结果表明，引入鳗鱼后，水稻产量显著提高。然而，高密度鳗鱼的引入显著限制了小龙虾的产量，增加了水 N 和 NO 的排放，并降低了土壤 N 含量。中观实验表明，引入鳗鱼后，肥料 N 的利用率显著提高。稻-小龙虾-鳗鱼系统中水稻对肥料 N 的利用率明显高于稻-小龙虾系统。本研究表明，在稻-小龙虾系统中引入鳗鱼可能是提高产量和肥料 N 有效性的一种好方法。
