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Effects of thaw slump on the bacterial community under desert steppe in the Beiluhe Region on the Qinghai-Tibet Plateau*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 06
Page:
1-12
Research Field:
Articles
Publishing date:

Info

Title:
Effects of thaw slump on the bacterial community under desert steppe in the Beiluhe Region on the Qinghai-Tibet Plateau*
Author(s):
ZHANG Xiaolan1 2 LIU Guimin 1** XU Haiyan 1 LI Xinxing 1 WU Xiaoli 1 JI Genghao 1 LI Lisha 1 & WU Xiaodong 2
1 School of Environmental and Municipal Engineering, Lanzhou Jiaotong University , Lanzhou 730070, China
2 Cryosphere Research Station on the Qinghai-Tibet Plateau, State Key Laboratory of Cryospheric Sciences, Northwest Institute of the Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Keywords:
thaw slump Qinghai-Tibet an Plateau desert steppe bacterial community permafrost High-Throughput Sequencing
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.01049
DocumentCode:

Abstract:
Permafrost degradation leads to thaw slumps, and thus further affects permafrost ecosystems. However, the effects of thaw slump on bacterial community largely remains unknow. We selected a desert steppe area in the central Qinghai-Tibetan Plateau. The Illumina sequencing technique was used to examine the soil bacterial communities. The sequence region was 16S rRNA V3-V4 hypervariable region of bacteria. At the Class level, the α diversity, relative abundances, and community composition of the soil bacterial under three micro-morphologies (control, collapsing, slumped) were examined. The soil physicochemical properties were also investigated to explore the main environmental factors affecting the bacterial community structure. At the class level, 91 classes were observed, the dominant classes were Actinobacteria (29.4%) , Acidobacteria (14.16%) , α-Proteobacteriaand (12.69%) and Gemmatimonadetes (6.92%) . The Actinobacteria are the most abundant in the soils of the three landforms. The results showed that the thaw slump dramatically changed the physicochemical properties of the soil, including soil water content, total carbon and organic carbon content. The Mantel test and RDA analysis showed that soil total carbon and water content were the driving environmental factors affecting the bacterial community struct ure; Correlation analysis showed that soil water content, conductivity, and total nitrogen were the driving factors of the bacterial diversity and the relative abundance of dominant classes. This study showed that thaw slump in desert steppe area decreased soil carbon contents and the relative abundance of Acidobacteria. The bacterial structure, diversity and distribution of soil bacteria were also greatly affected by thaw slumps.

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Last Update: 2019-04-12