麦秸、氮肥与土壤混合培养时氮素的固定、矿化与麦秸的分解
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IMMOBILIZATION AND MINERALIZATION OF NITROGEN AND DECOMPOSITION OF STRAW DURING INCUBATION OF SOILS MIXED WITH WHEAT STRAW AND NITROGEN FERTILIZER
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    摘要:

    应用3种土壤,在20℃和30℃温度下进行了与麦秸及不同量氮肥混合培养的试验,麦秸及氮化肥采取了15N标记、不标记的交叉处理。7周培养期间,各处理所含矿质氮包括所施化肥氮不同程度地被固定,一部分处理的起初被固定的矿质氮以后部分地得到释放,释放程度与土壤有机质和全氮含量以及培养温度有关。培养结束时,配施较多量氮肥的处理所施麦秸氮及化肥氮约有50-60%呈6N HC1水解氮组分之中,另有少量呈酸不溶性胡敏N形态,麦秸氮有4-17%矿化释放,化肥氮有10-50%仍为矿质氮形态,这些数值的高低基本上也与土壤的有机质和全氮含量以及培养温度有关。以一种土壤与非标记的麦秸和氮肥混合培养,测定了两个月期间的CO2释放量,并未发现增加氮肥施量会促进麦秸分解,增施氮肥反而有稍为减缓麦秸C分解的趋势。

    Abstract:

    A cinnamon soil and a lime concretion black soil from Huang-Hai-Hai Plain of China and a Palouse silty loan from eastern part of Washington state of U.S.A. were mixed with wheat streiw (15N labelled and unlabelled) and nitrogen fertilizer (15N labelled and unlabelled) in different. rotes and incubuted under 20℃ and 30℃ for 7 weeks to investi;ate the transformation of fertilizer-N and straw-N. More than 70% even all of the mineral N was immobilized in the soils incubated only with straw or low rate of N fertilizer under 200C or 300C after 1 week; and immobilization was dominant in the soils during the imubation from 2nd to the week. While Iess N immobilized in soils ineubated with lihlmr rate of N fertilizer after 1 week;and part of the immobilized N was mineralized in the soils incubated under 30℃ during the perind from 2nd to 7th week. It seemes that the immobilization rate of N in the soils decreased with the increase of fertilizer-N added. At the end of incubation 10-50% of fertilizer-N appeared as miniral-N in the soils with higher rates of N fertilizer. About 50-60% of the fertilizer-N and similar range of straw-N appeared as HCl hydrolpzable N. The immobilization rate decreased with the inerease of organiu matter and total nitrogen contens of the soils and the raising of incubation temperature.

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王维敏.麦秸、氮肥与土壤混合培养时氮素的固定、矿化与麦秸的分解[J].土壤学报,1986,23(2):97-105. Wang Weimin. IMMOBILIZATION AND MINERALIZATION OF NITROGEN AND DECOMPOSITION OF STRAW DURING INCUBATION OF SOILS MIXED WITH WHEAT STRAW AND NITROGEN FERTILIZER[J]. Acta Pedologica Sinica,1986,23(2):97-105.

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  • 在线发布日期: 2013-02-25
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