中国农业科学 ›› 2025, Vol. 58 ›› Issue (22): 4703-4717.doi: 10.3864/j.issn.0578-1752.2025.22.011

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

引黄灌区连续减施化肥对春小麦籽粒品质稳定性的影响

钱芝瑾1(), 王西娜1(), 田海梅1, 王月梅1, 郝雯悦1, 周慧1, 谭军利2   

  1. 1 宁夏大学农学院,银川 750021
    2 宁夏大学土木与水利工程学院,银川 750021
  • 收稿日期:2024-12-04 接受日期:2025-02-17 出版日期:2025-11-16 发布日期:2025-11-21
  • 通信作者:
    王西娜,E-mail:
  • 联系方式: 钱芝瑾,E-mail:qianzj2000@163.com。
  • 基金资助:
    国家自然科学基金(31860590); 国家重点研发计划(2018YFD0200405); 宁夏自然科学基金(2024AAC03128); 宁夏高等学校科学研究项目(NYC-2024-012); 宁夏粮食作物种质创制与生长调控科技创新团队(2022BSB03109)

Effects of Continuous Reduction Fertilization on the Stability of Spring Wheat Grain Quality in the Yellow River Irrigation Area of Ningxia

QIAN ZhiJin1(), WANG XiNa1(), TIAN HaiMei1, WANG YueMei1, HAO WenYue1, ZHOU Hui1, TAN JunLi2   

  1. 1 Agricultural College, Ningxia University, Yinchuan 750021
    2 School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021
  • Received:2024-12-04 Accepted:2025-02-17 Published:2025-11-16 Online:2025-11-21

摘要:

【目的】探索连续多年减施化肥对春小麦籽粒品质稳定性的影响,以评估化肥减施技术的可持续性,为宁夏春小麦化肥合理减施提供理论依据。【方法】以宁春4号为供试材料,2019—2023年开展氮、磷、钾化肥减施田间定位试验,根据前期氮、磷、钾肥用量试验所建立的肥料效应函数,设计减肥上限(RF1,施180 kg N·hm-2、45 kg P2O5·hm-2、30 kg K2O·hm-2)和减肥下限(RF2,施225 kg N·hm-2、75 kg P2O5·hm-2、45 kg K2O·hm-2)处理,同时设置常规施肥(CF,施270 kg N·hm-2、150 kg P2O5·hm-2、75 kg K2O·hm-2)和不施肥(CK)对照处理,分析2021—2023年氮、磷、钾化肥减施下春小麦旗叶SPAD值、叶面积、干物质分配、光合能力的变化以及籽粒品质稳定性。【结果】与常规施肥(CF)相比,减肥上限处理(RF1)的SPAD值和叶面积在2022—2023年均未显著下降(P>0.05),而减肥下限处理(RF2)的趋于增加。从光合指标来看,RF2处理的净光合速率、气孔导度、胞间CO2浓度、蒸腾速率较常规处理的趋于增加,而RF1的趋于下降,其中,2023年RF2处理的净光合速率较CF处理显著提高25.0%。春小麦干物质总量亦表现为RF2较高,2021、2022、2023年分别较CF处理的增加了2.2%、3.7%、0.1%,其干物质向籽粒的分配率在2021和2023年亦表现为最大,分别为38.3%和38.6%。对籽粒品质而言,适当减施化肥(RF2)有利于并持续提高春小麦籽粒中粗蛋白质含量和可溶性糖含量,其中2021和2023年粗蛋白质含量较常规施肥处理增加6.3%和12.2%;而过量减施化肥(RF1)则导致粗蛋白质和可溶性糖含量呈降低趋势。除不施肥处理外,RF1处理蛋白质产量最低,2021年和2023年分别较CF显著降低46.68%和38.72%。从品质稳定性来看,蛋白质稳定性指数以RF2处理的最低,各处理可溶性糖稳定性指数无显著差异,淀粉稳定性指数以RF1处理的最小,说明适量减施氮、磷、钾化肥有利于蛋白质的稳定。从相关分析结果来看,籽粒粗蛋白质含量与春小麦灌浆期旗叶的SPAD值、叶面积、净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、营养体和籽粒中干物质累积量均呈极显著正相关关系;同时,籽粒中干物质累积量与SPAD值、叶面积和净光合速率、气孔导度、蒸腾速率、成熟期营养体干物质累积量之间均呈极显著正相关关系;籽粒中可溶性糖含量与气孔导度、胞间CO2浓度、蒸腾速率呈正相关关系。通过主成分分析发现,籽粒产量、蒸腾速率、净光合速率、气孔导度和粗蛋白质含量、淀粉含量和叶面积的载荷值较高,且减肥下限处理的春小麦品质最佳。【结论】宁夏引黄灌区连续适量减施化肥(225 kg N·hm-2、75 kg P2O5·hm-2、45 kg K2O·hm-2,相对常规施肥减N 17.0%、减P2O5 50.0%、减K2O 40.0%)可以在一定程度上增大春小麦灌浆期旗叶SPAD值和叶面积,改善灌浆期的光合效率,促进干物质积累并向籽粒转运和分配,从而稳定提高籽粒品质,尤其提高了粗蛋白和可溶性糖含量。

关键词: 春小麦, 连续减施化肥, 光合能力, 干物质累积与分配, 籽粒品质稳定性

Abstract:

【Objective】The objective of this study was to investigate the effect of continuous reducing chemical fertilizer on the stability of spring wheat grain quality, to evaluate the sustainability of chemical fertilizer reduction techniques, and then to provide a theoretical basis for the rational reduction of chemical fertilizers in spring wheat in the Yellow River Irrigation Area of Ningxia. 【Method】A positioning field experiment on the reduction of nitrogen, phosphorus, and potassium fertilizers was conducted with Ningchun 4 cultivar of spring wheat as the test crop from 2019 to 2023. According to the fertilizer response functions established in previous experiments on nitrogen, phosphorus, and potassium application rates, the treatments of the upper limit of fertilizer reduction (RF1: applying 180 kg of N, 45 kg of P2O5, and 30 kg of K2O per hectare) and the lower limit of fertilizer reduction (RF2: applying 225 kg of N, 75 kg of P2O5, and 45 kg of K2O per hectare) were designed. Additionally, a conventional fertilization treatment (CF: applying 270 kg of N, 150 kg of P2O5, and 75 kg of K₂O per hectare) and a no- fertilization (CK) were set as controls. The variations in the SPAD value, leaf area, dry matter allocation, and photosynthetic capacity of spring wheat flag leaves from 2021 to 2023 were measured to analyze the stability of grain quality. 【Result】During 2022-2023, compared with the conventional fertilization treatment, the SPAD value and leaf area under RF1 treatment did not decrease significantly (P>0.05), and those under RF2 treatment tended to increase, yet without reaching a significant level. As for the photosynthetic indicators, in 2021 and 2023, the net photosynthetic rate, stomatal conductance, and transpiration rate were the highest under RF2 treatment, which was increased by 29.8% and 25.0%, 6.1% and 6.9%, 5.4% and 16.6%, compared with CF treatment, respectively, while RF1 treatment showed a certain degree of decline compared with CF treatment. From 2021 to 2023, the total dry matter of spring wheat presented the order of RF2 > CF > RF1 > CK. In 2021, CK treatment significantly decreased by 53.3%, 50.1% and 56.6% compared with CF, RF1 and RF2 treatment, respectively, and significantly decreased by 67.2%, 57.9% and 67.3% in 2023, respectively. In 2021 and 2023, the distribution rate of dry matter to grain was the highest under RF2, which was 38.3% and 38.6%, respectively. For grain quality, appropriate reducing chemical fertilizer application (RF2) was conducive to and continuously increases the crude protein content and soluble sugar content in spring wheat grains; compared with the CF treatment, in 2021 and 2023, they increased by 6.3% and 1.0%, 14.4% and 1.8%, and 12.2% and 1.4%, respectively. However, excessive reduction of chemical fertilizer application (RF1) led to a decreasing trend in crude protein and soluble sugar content. Except for the no-fertilization control, the RF1 treatment resulted in the lowest protein yield, which was significantly reduced by 46.68% and 38.72% compared to the CF treatment in 2021 and 2023, respectively.The protein stability index was based on the lowest RF2. There was little difference in the soluble-sugar stability index among different treatments, and the starch stability index was the minimum under RF1 treatment. The crude protein content in grains was extremely significantly and positively correlated with the SPAD value, leaf area, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, dry matter accumulation in vegetative organs and grains of the flag leaves during the grain-filling period of spring wheat. Meanwhile, there were extremely significant positive correlations among the SPAD value, leaf area, net photosynthetic rate, stomatal conductance, transpiration rate, and dry matter accumulation in vegetative organs and grains at the maturity stage. The soluble sugar content in grains was positively correlated with stomatal conductance, intercellular CO2 concentration, and transpiration rate. Through principal component analysis, it was found that the load values of grain dry matter mass, transpiration rate, net photosynthetic rate, stomatal conductance, crude protein content, starch content, and leaf area were relatively high, and the quality of spring wheat under RF2 treatment was the best. 【Conclusion】In the Yellow River Irrigation Area of Ningxia, the continuous and appropriate reduction of chemical fertilizers (applying 225 kg N·hm-2, 75 kg P2O5·hm-2 and 45 kg K2O·hm-2, with a 17.0% reduction in N, a 50.0% reduction in P2O5, and a 40.0% reduction in K2O compared to CF) could, to a certain extent, increase the SPAD value and leaf area of the flag leaves during the grain-filling stage of spring wheat, improve its photosynthetic efficiency, and promote dry matter accumulation and its translocation and distribution to grains, thereby stably improving the quality of grain, especially for the content of crude protein and soluble sugar.

Key words: spring wheat, continuous reduction of fertilizer application, photosynthetic capacity, dry matter accumulation and distribution, quality stability of grain