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草业学报  2009 

苜蓿草地土壤氮矿化的研究

, PP. 11-17

Keywords: 黄土高原,淋洗,施N,植被覆盖,土壤N净矿化率

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Abstract:

12周温室培养条件下,研究了淋洗起始矿质氮、施N和植被覆盖对庆阳黄土高原5龄和9龄苜蓿草地土壤氮矿化的影响。结果表明,起始无机氮对土壤N矿化有一定的抑制作用,去除起始无机氮后,N净矿化率提高了0.05～0.07mg/(kg·d)。添加外源N肥使5龄苜蓿草地NO3--N含量增加了56倍,N净矿化率提高了200%;9龄苜蓿草地NO3--N含量仅增加了2倍,N净矿化率降低了62.5%。植被覆盖对土壤N净矿化率有显著影响,N净矿化率比对照提高了12～18倍。施N肥且覆盖植被使N净矿化率提高了18～25倍。9龄苜蓿土壤的矿化能力显著高于5龄苜蓿土壤。在草田轮作系统中,苜蓿土壤翻耕后不宜休闲,应立即种植后续作物,可减少雨季土壤表层氮的淋失,提高氮素有效性。

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