【摘要】 选取新疆富蕴地震断裂带8种次生植物根际土壤,以同土层裸地为对照,测量土壤化学性质,利用末端限制性片段长度多态性技术研究塌陷区次生植物对土壤古菌群落的影响。结果表明,多数植物根际土壤养分显著(P<0.05)高于对照,其主要古菌类群为泉古菌门(Crenarchaeota)和广古菌门(Euryarchaeota),群落间多样性差异大,相似性低。不同植物根际土壤古菌的优势类群数量差异较大,鼠掌老鹳草高达18种,西北绢蒿少为2种。典范对应分析表明,土壤有机质含量对古菌优势类群分布影响最大(HhaⅠ酶切:r=0.94;RsaⅠ酶切:r=0.74),速效磷含量与古菌群落各多样性指数呈显著正相关(P<0.05),总氮含量与均匀度指数E呈显著正相关(P<0.05)。新疆地震断裂带植被的恢复可影响根际土壤古菌群落的分布、组成和结构,其原因与植物根际土壤化学性质有关,同时在改善土壤肥力方面也有显著效果。更多还原

【Abstract】 Strong earthquake could cause a variety of secondary geological disasters,and severely damage ecological environment.After earthquake,the vulnerable and sensitive ecosystems are going through a series of vegetation restoration and soil succession.Of this,vegetation recovery was regarded as the core of reconstruction of ecological restoration.However,the current research mainly focused on the investigation,recovery and reconstruction of the ecosystem damage from a macro perspective.Research in regard to the relationship between vegetation and soil microbial was rarely reported.Fuyun earthquake fault zone is located in Fuyun county of Altay in Xinjiang,which was caused by a serious earthquake of 8 scales on August 11,1931 and formed a 176 km long rift.It was one of the rare earthquake fault zones in the world.The aim of this study therefore was to investigate the effect of secondary plants on soil archaeal communities in the secondary barren of Fuyun seismic fault zone in Xinjiang.In a 300×30m range(collapse region was long and narrow),8 different plants were selected as dominant plant species after investigation.They were Salix vistita,Salix rectijulis,Eremopyrum orientale,Seriphidium nitrosum,Geranium sibiricum,Spiraea media,Galium verum and Rosa spinosissima.The rhizosphere soils collected from the 8 different plants were studied by testing soil chemical properties(mainly include soil organic matter,pH,total nitrogen,available nitrogen,available phosphorus and available potassium) and soil archaeal community structures were surveyed by employing Terminal restriction fragment length polymorphism(T-RFLP).Unplanted soil in the same depth served as control.The results showed that the soil in study site was alkaline(pH=8.28—8.51).The soil nutrient contents in Eremopyrum orientale′s rhizosphere were generally higher compared with other plant.There were great differences in soil nutrient content among samples,but the overall trend was the nutrients in most plants′ rhizosphere soil was significantly(P<0.05) higher than control.Archaeal 16S rDNA fragments could be amplified only in the rhizosphere soils.The diversity indices(include richness,Shannon-Weiner index,Simpson index and evenness) were vary with different enzymes digestion.The similarities of archaeal communities calculated by the Sorensen formula were low among different rhizosphere soils and most numerous were in Geranium sibiricum′s rhizosphere with 18 species and minimum were in Seriphidium nitrosum with 2 species.Crenarchaeota and Euryarchaeota were the main possible archaeal groups identified by MiCA(Microbial Community Analysis) online analysis.Canonical correspondence analysis(CCA) showed that soil organic matter,available phosphorus,total nitrogen and pH can significantly affect the archaeal communities.Especially soil organic matter had the greatest impact on the distribution of dominant archaeal groups(HhaⅠ digestion: r=0.94;RsaⅠ digestion: r=0.74).Correlation analysis showed that soil available phosphorus content was positively correlated with all diversity indices of archaeal communities(P<0.05),and total nitrogen content showed a significant positive correlation(P<0.05) to the evenness index in HhaⅠdigestion.These results indicated that recovery of vegetation not only could affect archaeal communities′ composition,structure and distribution in earthquake fault zone of Xinjiang,but also could improve the soil fertility and possible reasons were related to rhizosphere′s chemical properties.更多还原