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不同生境柽柳灌丛土壤线虫群落特征

, PP. 1057-1063

Keywords: 土壤线虫,柽柳,灌丛,湿地,沙丘,临泽县,甘肃

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Abstract:

对干旱区固定沙丘(SD)、河岸湿地(RW)和盐碱湿地(SW)3种不同生境柽柳灌丛冠幅内(UC)和冠幅外(IS)土壤线虫群落进行了比较研究,共鉴定分离得到土壤线虫20属1245条。研究表明3种生境柽柳灌丛线虫总数均表现为[WTBX]UC>IS,[WTBZ]不同生境柽柳灌丛冠幅内线虫总数表现为SD>RW>SW,冠幅外线虫总数SD>RW>SW;对线虫营养类群和主要功能团分析结果表明,固定沙丘冠幅内外土壤线虫以食细菌线虫为主,2种湿地生境冠幅内外以植物寄生线虫为主,cp-2的食细菌线虫(Ba2)功能团对食细菌线虫(BF)总数起决定作用,土壤中的水溶性盐分对Ba-2功能团线虫具有显著的抑制效应。而cp-3的植物寄生线虫(H3)在植物寄生线虫(PP)中为主要功能团,H3功能团线虫与EC相关性不显著,说明该功能团对土壤水溶性盐分具有一定的适应性。通过对土壤线虫群落结构特征的分析,能够从土壤生物学角度揭示干旱区不同生境柽柳灌丛土壤微环境的不同。

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