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草地学报  2014 

火烧和施氮对内蒙古半干旱草原土壤微生物群落碳源利用潜力的影响

DOI: 10.11733/j.issn.1007-0435.2014.04.006, PP. 713-721

Keywords: 火干扰,氮沉降,细菌,真菌,碳源利用

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Abstract:

火烧是草原生态系统中最常见的一种自然现象,而氮素通常被认为是干旱、半干旱地区的主要限制因子。在中国北方草原生态系统相对干旱、长期处于氮素限制条件下,对火干扰和氮沉降非常敏感。通过在内蒙古多伦县半干旱草原地区进行火烧和施氮的野外控制试验,采用BIOLOG微孔板技术探讨火烧与施氮对土壤微生物量及其碳源利用的影响。结果表明火烧和施氮处理显著降低生长季初期土壤微生物量;但是施氮显著促进了土壤细菌类群对多聚物、糖类、酚类和胺类碳源的利用,及真菌类群对胺类碳源的利用;而且火烧与施氮处理在影响土壤细菌碳源利用上表现出明显的交互效应,火烧削弱了施氮对细菌碳源利用的促进作用。火烧与施氮对生长季初期土壤微生物的这些影响,可能通过影响有效养分的释放而影响后期植物生长,但由于火烧与施氮处理在影响土壤微生物过程中表现出来的复杂性,这种对植物后期生长的影响可能存在较大的不确定性。

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