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黄土区沟道泥沙微生物群落变化特征及其影响因素 被引量:5
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作者 侯芳彬 王蕊 +2 位作者 Salman Ali 高鑫 郭胜利 《中国环境科学》 EI CAS CSCD 北大核心 2019年第10期4350-4359,共10页
在黄土高原沟壑区,通过16S rRNA基因片段和ITS高通量测序,研究沟道泥沙中细菌和真菌群落在上-中-下游的变化特征.结果表明:与沟头相比,把口站的细菌群落中拟杆菌门(Bacteroidetes)与厚壁菌门(Firmicutes)的相对丰度分别增加6.6%和10.5%... 在黄土高原沟壑区,通过16S rRNA基因片段和ITS高通量测序,研究沟道泥沙中细菌和真菌群落在上-中-下游的变化特征.结果表明:与沟头相比,把口站的细菌群落中拟杆菌门(Bacteroidetes)与厚壁菌门(Firmicutes)的相对丰度分别增加6.6%和10.5%,而变形菌门(Proteobacteria)的相对丰度降低15.1%;真菌群落中担子菌门(Basidiomycota)的相对丰度增加7.7%,而子囊菌门(Ascomycota)降低30.2%;泥沙中黏粒含量与细菌丰富度(Chao1指数)和多样性(Shannon指数)之间显著负相关(P<0.05),与真菌的丰富度和多样性无显著相关性;细菌和真菌群落多样性和丰富度的空间差异与SOC、Olsen-P的变化有关(P<0.05).因此,泥沙中颗粒组成物和养分含量可能是影响沟道微生物群落变化的主要因素. 展开更多
关键词 沟道泥沙 空间重分布 细菌 真菌 颗粒组成
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Long-Term Impact of Extra Sediment on Notches and Incised Meanders in the Hoshe River, Taiwan
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作者 Su-Chin CHEN Chun-Hung WU +1 位作者 Yi-Chiung CHAO Pei-Yu SHIH 《Journal of Mountain Science》 SCIE CSCD 2013年第5期716-723,共8页
The extra sediment load induced by typhoons and rainstorms in the Heshe River, Taiwan, are the principal reason for severe sediment-related disasters. The total sediment load during Typhoon Morakot in 9009 was 31 x lo... The extra sediment load induced by typhoons and rainstorms in the Heshe River, Taiwan, are the principal reason for severe sediment-related disasters. The total sediment load during Typhoon Morakot in 9009 was 31 x lo6 m3, accounting for 95% of the annual sediment discharge. Large amounts of sediment load entered the Hoshe River, causing the braiding index (BI) to increase. Subsequently, the BI became positively correlated with the channel width in the Hoshe River. The specific typhoon and rainstorm events decreased after Typhoon Morakot, the sediment input decreased, inducing the fluvial morphology of the braided river to develop into a meandering river. The extra sediment load induced the deposition depth to increase and produce a headward deposition in the main channel and its tributaries. In addition, the river bend and the topographical notch restrained the sediment from moving downstream and being stored locally, indirectly increasing the erosion density of the river banks from 2.5 to lo.5 times. 展开更多
关键词 Extra sediment load River morphology Braiding index
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