Feng Jinfei, Liu Yaobin, Li Fengbo, Zhou Xiyue, Xu Chunchun, Fang Fuping
China National Rice Research Institute, No.359 Tiyuchang Rd, Hangzhou, 310006, Zhejiang, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Jul;28(28):38034-38042. doi: 10.1007/s11356-020-12064-5. Epub 2021 Mar 16.
Greenhouse gas (GHG) emissions from aquaculture have gained widespread attention. However, the effect of phosphorus (P) and potassium (K) on GHG emissions from aquaculture systems has rarely been studied. In this study, we conducted a laboratory-scale experiment to investigate the effect of P and K addition on CH and NO emissions and nutrient use efficiency in a rice-fish co-culture system. The results showed that the CH flux rate did not differ between the rice-fish co-culture (RF) and fish monoculture (F) systems. Phosphorus addition did not affect CH emission from the RF. In contrast, K addition significantly increased the CH emission from the RF by 148.4%. Dual P and K addition greatly increased the CH emission from the RF by six times, indicating an interactive effect of P and K on the stimulation of CH emission. Phosphorus addition strengthened the restorative effect of the RF on NO emission, while K addition weakened the restorative effect of the RF on NO emission. The combination of P and K did not affect the NO emission from the RF. The application of P and K strengthened the restorative effect of rice on nitrogen (N) pollution in aquaculture water. Phosphorus and K addition significantly increased the rice biomass and nutrient in the harvested rice, but did not affect the fish biomass and nutrient in the harvested fish. Dual P and K addition increased the nutrient use efficiency in the rice-fish system. These results provide a reference for adjusting nutrient management to reduce GHG emissions and improve nutrient use efficiency in the rice-fish system.
水产养殖产生的温室气体（GHG）排放已受到广泛关注。然而，磷（P）和钾（K）对水产养殖系统温室气体排放的影响鲜有研究。在本研究中，我们进行了一项实验室规模的实验，以探究添加P和K对稻鱼共养系统中CH和NO排放以及养分利用效率的影响。结果表明，稻鱼共养（RF）系统和单养鱼类（F）系统之间的CH通量率没有差异。添加P对RF系统的CH排放没有影响。相比之下，添加K使RF系统的CH排放显著增加了148.4%。同时添加P和K使RF系统的CH排放大幅增加了6倍，表明P和K对刺激CH排放具有交互作用。添加P增强了RF系统对NO排放的修复作用，而添加K则削弱了RF系统对NO排放的修复作用。P和K的组合对RF系统的NO排放没有影响。P和K的施用增强了水稻对水产养殖水中氮（N）污染的修复作用。添加P和K显著增加了收获水稻的生物量和养分含量，但对收获鱼类的生物量和养分含量没有影响。同时添加P和K提高了稻鱼系统的养分利用效率。这些结果为调整养分管理以减少温室气体排放和提高稻鱼系统的养分利用效率提供了参考。
