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以郑单958为材料,在大田试验中设置0(S0)、40(S1)、80(S2)、120(S3)、160 kg/hm2(S4)5个施硫(硫磺)水平,研究不同施硫量对玉米光合特性及产量的影响。结果表明,从抽雄吐丝期至灌浆期,S2、S3处理玉米一直保持较高的叶面积指数(LAI)和叶绿素含量(SPAD)。施硫量为S2处理时,玉米净光合速率(P_n)、气孔导度(G_s)均表现为最大值,分别较S0处理提高19.08%、76.7%,且达到显著水平。胞间二氧化碳浓度(C_i)、蒸腾速率(T_r)分别在S3、S4处理时达到最大值,且显著高于S0处理。施用硫肥能够显著降低玉米气孔限制值(L_s),且施硫量为S2时达最小值,与S0处理达到差异显著水平。施用硫肥能显著提高PSⅡ的潜在活性(F_v/F_o)、PSⅡ原初光能转化效率(F_v/F_m)、PSⅡ有效光化学量子产量(F_v’/F_m’)和光化学猝灭系数(qP),显著降低非光化学猝灭系数(NPQ)。施用硫肥能够显著提高玉米产量,增产幅度为7.0%~18.1%。施硫量为S2时,玉米产量最高,为12 978.3 kg/hm~2。
Taking Zhengdan958 as the material, five sulfur (sulfur) levels of 0 (S0), 40 (S1), 80 (S2), 120 (S3) and 160 kg / hm2 (S4) Effect of Sulfur Application on Photosynthetic Characteristics and Yield of Maize. The results showed that the leaf area index (LAI) and chlorophyll content (SPAD) of S2 and S3 treatments remained high from the sprouting stage to the filling stage. When applying sulfur to S2, the net photosynthetic rate (P_n) and stomatal conductance (G_s) of maize showed the maximum values, which were respectively 19.08% and 76.7% higher than that of S0 treatment, reaching significant levels. The intercellular CO2 concentration (C_i) and transpiration rate (T_r) reached the maximum at S3 and S4, respectively, and were significantly higher than those at S0 treatment. Application of sulfur fertilizer can significantly reduce the stomatal limitation (L_s) of maize, and reached the minimum value when the amount of sulfur applied was S2, reaching a significant level of difference with S0 treatment. Sulfur fertilization could significantly increase the potential activity of PS Ⅱ (F_v / F_o), PS Ⅱ primary light energy conversion efficiency (F_v / F_m), PS Ⅱ effective photochemical quantum yield (F_v ’/ F_m’) and photochemical quenching coefficient (qP) Reduce non-photochemical quenching factor (NPQ). Application of sulfur fertilizer can significantly increase the yield of maize, increase rate of 7.0% ~ 18.1%. When the amount of sulfur applied was S2, the yield of maize was the highest, which was 12 978.3 kg / hm ~ 2.