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植物研究  2015 

火干扰对小兴安岭两种典型林型土壤养分和土壤微生物生物量的影响

DOI: 10.7525/j.issn.1673-5102.2015.01.016, PP. 101-109

Keywords: 土壤微生物量,火干扰,养分因子,小兴安岭

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Abstract:

?选择伊春地区白桦林和兴安落叶松林近期(火后1年)轻度火烧迹地为研究对象,采用氯仿熏蒸浸提法分别测定两种典型林型在不同月份(6月、8月、10月和12月)火烧与未火烧区域土壤微生物生物量碳(Cmic)和氮(Nmic)的含量,并研究火干扰后Cmic和Nmic与土壤养分因子的关系。结果表明:白桦林火烧区域Cmic的总平均值低于未火烧区域,而Nmic的总平均值有所增加。与未火烧区域相比,火干扰后白桦林Cmic含量在各月份均无显著性差异(P>0.05),6、8、10和12月火烧(未火烧区域)Cmic含量平均分别为:1389.6(1247.2)、886.7(759.0)、1098.9(1052.6)和1421.4(1749.7)mg·kg-1。而Nmic含量在6、8和10月显著增高(P<0.05),Nmic含量平均分别为:214.5(143.4)、101.9(67.5)、119.6(89.4)和150.2(183.3)mg·kg-1。土壤含水量对Cmic和Nmic影响显著,Nmic与土壤pH值呈显著正相关。与未火烧区域相比,火干扰后兴安落叶松林Cmic和Nmic的总平均值均有所减少。火烧与未火烧区域Cmic和Nmic含量在各月份均无显著性差异(P>0.05),6、8、10和12月火烧(未火烧区域)Cmic含量平均分别为:689.7(695.9)、612.3(910.4)、361.6(474.7)和1288.5(1353.8)mg·kg-1,而Nmic含量平均分别为:105.7(124.4)、91.4(111.4)、44.0(76.9)和118.9(134.5)mg·kg-1。Cmic和Nmic与土壤含水量呈显著正相关,与土壤pH值呈显著负相关。白桦林火烧区域土壤含水量和土壤pH的总平均值高于未火烧区域,而土壤有机碳和土壤全氮的总平均值有所减少。与未火烧区域相比,火干扰后兴安落叶松林土壤含水量和土壤pH的总平均值低于未火烧区域,而土壤有机碳和土壤全氮的总平均值有所增加。

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