作物学报 ›› 2024, Vol. 50 ›› Issue (12): 3129-3143.doi: 10.3724/SP.J.1006.2024.41026
韦金贵(), 毛守发, 江俞欣, 樊志龙, 胡发龙, 柴强(), 殷文()
WEI Jin-Gui(), MAO Shou-Fa, JIANG Yu-Xin, FAN Zhi-Long, HU Fa-Long, CHAI Qiang(), YIN Wen()
摘要:
针对西北绿洲灌区小麦连作普遍、化肥施用量较大及氮素利用率低等问题, 探究麦后复种绿肥对减量施氮小麦籽粒产量和氮素利用的补偿效应, 以期为构建减氮小麦高效生产技术提供理论依据。本研究依托始于2018年的定位试验进行, 2020—2022年期间采集数据。试验采用裂区设计, 主区设4种绿肥种植模式, 即麦后分别复种毛叶苕子混播箭筈豌豆(HCV)、箭筈豌豆(CV)、油菜(R)和麦后休闲(F); 副区为3种施氮水平: 试区习惯施氮量(N3, 180 kg hm-2)、习惯施氮减量20% (N2, 144 kg hm-2)、习惯施氮减量40% (N1, 108 kg hm-2)。研究表明, 习惯施氮减量20%和40%显著降低了小麦籽粒产量和氮素吸收, 但麦后复种毛叶苕子混播箭筈豌豆可补偿因减量施氮40%造成的籽粒产量和氮素吸收损失, 且麦后复种毛叶苕子混播箭筈豌豆结合减量施氮20%提高小麦籽粒产量21.4%和氮素吸收6.9% (P < 0.05)。麦后复种毛叶苕子混播箭筈豌豆可补偿因减量施氮40%造成的氮素利用率损失, 且其结合减量施氮20%氮素利用率提高13.4% (P < 0.05)。其补偿机制归因于: (1) 麦后复种毛叶苕子混播箭筈豌豆在减量施氮40%条件下可补偿小麦氮素吸收速率, 提高氮素净同化速率34.3% (P < 0.05), 维持穗部氮素分配, 增加茎氮素转运率6.6% (P < 0.05)。(2) 与麦后休闲传统施氮量相比, 麦后复种毛叶苕子混播箭筈豌豆结合减量施氮20%提高氮素平均吸收速率和氮素净同化速率7.2%和34.1% (P < 0.05), 增加灌浆初期至成熟期穗氮素分配6.7% (P < 0.05), 提高叶、茎氮素对穗的转运贡献率17.8%、8.9% (P < 0.05)。因此, 在干旱绿洲灌区, 麦后复种毛叶苕子混播箭筈豌豆是实现小麦减氮40%的可行措施, 麦后复种毛叶苕子混播箭筈豌豆结合减氮20%可通过提高小麦氮素吸收速率和氮素净同化率, 提高叶、茎对穗的转运贡献率从而促进穗部氮素分配, 实现小麦产量和氮素利用率双提升。
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