Shuitu Baochi Xuebao, 2018 研究不同覆盖措施下农田土壤全氮及其活性和半活性组分在作物生长季的动态变化，有助于深入理解农田土壤氮循环过程。基于黄土高原8年春玉米覆盖定位试验，系统分析了土壤全氮、矿质氮、微生物量氮、潜在可矿化氮以及颗粒有机氮在玉米不同生育期的动态特征。试验包括全生育期9 000 kg/hm2秸秆覆盖、全生育期地膜覆盖和不覆盖对照3个处理。结果表明：（1）除硝态氮和铵态氮在苗期上升外，秸秆和地膜覆盖下土壤全氮及其组分含量在春玉米生育期基本呈苗期下降、拔节期上升、大喇叭口—抽雄期下降、灌浆和收获期回升的变化趋势；（2 ...
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