氮素增效剂对稻模式水稻光合效应及土壤氮素形态的影响

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Impact of nitrogen synergist on rice photosynthetic effects and soil nitrogen forms inrice-loach model

HOU Daijie'， LI Yici¹， ZOU Long²， LIU Hao²，DENG Kangsheng1³， XU Huaqin' （1 College of Environment and Ecology，Hunan AgriculturalUniversity， Changsha 410128， China; 2Colege of Agriculture， Hunan Agricultural University， Changsha 410128， China; 3 Shuangfeng County Bureau of Agriculture and Rural Affairs， Loudi 417799， China）

Abstract： 【Objective】 This study aims to investigate the effects of nitrogen fertilizer synergists on soil nitrogen transformation and rice photosynthetic physiological characteristics in a rice-loach co-culture system， and provide an efficient nitrogen management strategy for rice-fishery integrated systems. 【Method】A pot experiment was conducted under the rice-loach co-culture model with thre treatments： application of a urease inhibitor （N），application ofa nitrification inhibitor （M），and the combined application of both inhibitors （N+M）With no synergist application as the control （CK）， soil inorganic nitrogen content，activities of key nitrogen transformation enzymes，and rice leaf photosynthetic characteristics were measured at different growth stages. 【Result】 Compared with CK，the nitrogen fertilizer synergist treatments improved rice photosynthesis， with the N+M treatment showing the best performance. The N+M treatment increased the net photosynthetic rate by 14.51% ， 14.69% ，and 7.71% at the booting， full heading， and grain filling stages， respectively. The synergist treatments significantly increased soil ammonium nitrogencontent while decreasing nitrate nitrogen content，and theyalso inhibited soil urease and ammonia monooxygenaseactivities. Correlation analysis revealed that the net photosyntheticrate was significantly and positively correlated with soil ammonium nitrogen contentbut significantly and negatively correlated with nitrate nitrogen content，urease activity and ammonia monooxygenase activity. 【Conclusion】In the rice-loach co-culture system， nitrogen fertilizer synergists can effectively regulate soil nitrogen transformation towards a high-ammonium and low-nitrate state by inhibiting nitrogen-transforming enzyme activities， thereby significantly promoting rice photosynthesis. The combined application of urease and nitrification inhibitors demonstrates the optimal effect.

Keywords： Rice-loach co-culture system; Nitrogen fertilizer enhancer; Soil nitrogen; Photosyntheticcharacteristics

稻渔综合种养作为一种生态农业典范，通过耦合水稻种植与水产养殖，构建高效的农田复合生态系统[1]。（剩余8838字）