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Title: The Biogeographic Pattern of Microbial Functional Genes along an Altitudinal Gradient of the Tibetan Pasture

Abstract

As the highest place of the world, the Tibetan plateau is a fragile ecosystem. Given the importance of microbial communities in driving soil nutrient cycling, it is of interest to document the microbial biogeographic pattern here. We adopted a microarray-based tool named GeoChip 4.0 to investigate grassland microbial functional genes along an elevation gradient from 3200 to 3800 m above sea level open to free grazing by local herdsmen and wild animals. Interestingly, microbial functional diversities increase with elevation, so does the relative abundances of genes associated with carbon degradation, nitrogen cycling, methane production, cold shock and oxygen limitation. The range of Shannon diversities (10.27–10.58) showed considerably smaller variation than what was previously observed at ungrazed sites nearby (9.95–10.65), suggesting the important role of livestock grazing on microbial diversities. Closer examination showed that the dissimilarity of microbial community at our study sites increased with elevations, revealing an elevation-decay relationship of microbial functional genes. Both microbial functional diversity and the number of unique genes increased with elevations. Furthermore, we detected a tight linkage of greenhouse gas (CO2) and relative abundances of carbon cycling genes. Our biogeographic study provides insights on microbial functional diversity and soil biogeochemical cycling in Tibetan pastures.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1394543
DOE Contract Number:
AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Frontiers in Microbiology; Journal Volume: 8; Journal Issue: N/A
Country of Publication:
United States
Language:
English

Citation Formats

Qi, Qi, Zhao, Mengxin, Wang, Shiping, Ma, Xingyu, Wang, Yuxuan, Gao, Ying, Lin, Qiaoyan, Li, Xiangzhen, Gu, Baohua, Li, Guoxue, Zhou, Jizhong, and Yang, Yunfeng. The Biogeographic Pattern of Microbial Functional Genes along an Altitudinal Gradient of the Tibetan Pasture. United States: N. p., 2017. Web. doi:10.3389/fmicb.2017.00976.
Qi, Qi, Zhao, Mengxin, Wang, Shiping, Ma, Xingyu, Wang, Yuxuan, Gao, Ying, Lin, Qiaoyan, Li, Xiangzhen, Gu, Baohua, Li, Guoxue, Zhou, Jizhong, & Yang, Yunfeng. The Biogeographic Pattern of Microbial Functional Genes along an Altitudinal Gradient of the Tibetan Pasture. United States. doi:10.3389/fmicb.2017.00976.
Qi, Qi, Zhao, Mengxin, Wang, Shiping, Ma, Xingyu, Wang, Yuxuan, Gao, Ying, Lin, Qiaoyan, Li, Xiangzhen, Gu, Baohua, Li, Guoxue, Zhou, Jizhong, and Yang, Yunfeng. Tue . "The Biogeographic Pattern of Microbial Functional Genes along an Altitudinal Gradient of the Tibetan Pasture". United States. doi:10.3389/fmicb.2017.00976.
@article{osti_1394543,
title = {The Biogeographic Pattern of Microbial Functional Genes along an Altitudinal Gradient of the Tibetan Pasture},
author = {Qi, Qi and Zhao, Mengxin and Wang, Shiping and Ma, Xingyu and Wang, Yuxuan and Gao, Ying and Lin, Qiaoyan and Li, Xiangzhen and Gu, Baohua and Li, Guoxue and Zhou, Jizhong and Yang, Yunfeng},
abstractNote = {As the highest place of the world, the Tibetan plateau is a fragile ecosystem. Given the importance of microbial communities in driving soil nutrient cycling, it is of interest to document the microbial biogeographic pattern here. We adopted a microarray-based tool named GeoChip 4.0 to investigate grassland microbial functional genes along an elevation gradient from 3200 to 3800 m above sea level open to free grazing by local herdsmen and wild animals. Interestingly, microbial functional diversities increase with elevation, so does the relative abundances of genes associated with carbon degradation, nitrogen cycling, methane production, cold shock and oxygen limitation. The range of Shannon diversities (10.27–10.58) showed considerably smaller variation than what was previously observed at ungrazed sites nearby (9.95–10.65), suggesting the important role of livestock grazing on microbial diversities. Closer examination showed that the dissimilarity of microbial community at our study sites increased with elevations, revealing an elevation-decay relationship of microbial functional genes. Both microbial functional diversity and the number of unique genes increased with elevations. Furthermore, we detected a tight linkage of greenhouse gas (CO2) and relative abundances of carbon cycling genes. Our biogeographic study provides insights on microbial functional diversity and soil biogeochemical cycling in Tibetan pastures.},
doi = {10.3389/fmicb.2017.00976},
journal = {Frontiers in Microbiology},
number = N/A,
volume = 8,
place = {United States},
year = {Tue Jun 13 00:00:00 EDT 2017},
month = {Tue Jun 13 00:00:00 EDT 2017}
}