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草业学报 2011

苏丹草-黑麦草轮作制中施氮量对饲草产量与土壤氮碳积累的影响

, PP. 55-61

李文西,鲁剑巍,鲁君明,李小坤

Keywords: 苏丹草-黑麦草轮作,施氮量,产量,碳氮积累

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Abstract:

利用4年苏丹草与黑麦草轮作种植定位试验研究氮肥用量对饲草产量、饲草氮碳积累及土壤全氮、有机碳的影响。结果表明,随着氮肥用量的增加,4个年度的饲草总产量也随之增加,与N0处理(不施氮肥)相比,N1处理(两季共施N337.5kg/hm2)分别增加243.5%,234.0%,153.6%和127.0%,N2处理(两季共施N675kg/hm2)分别增加313.1%,339.9%,231.7%和222.8%。增施氮肥可以促进饲草的N、C积累,N1、N2处理的总N、C积累分别比N0处理增加134.7%,261.9%与110.2%,181.5%。轮作体系下,随着苏丹草、黑麦草不断种植,N1、N2处理的土壤全氮均上升,且显著正相关,而N0处理基本稳定;N0、N1、N2处理的土壤有机碳均上升,且显著正相关;与种植前相比,N1、N2处理的土壤C/N变化不大,而N0处理的土壤C/N明显上升。

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