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Effects of introducing eels on the yields and availability of fertilizer nitrogen in an integrated rice-crayfish system

文献类型： 外文期刊

作者： Lv, Weiwei 1 ; Yuan, Quan 1 ; Lv, Weiguang 1 ; Zhou, Wenzong 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： 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 N2O 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.

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