scholarly journals Soil bacterial community responses to short-term grazing exclusion in a degraded alpine shrubland – grassland ecotone

2021 ◽  
Vol 130 ◽  
pp. 108043
Author(s):  
Jinlan Wang ◽  
Wen Li ◽  
Wenxia Cao ◽  
Theophilus Atio Abalori ◽  
Yuzhen Liu ◽  
...  
2017 ◽  
Vol 101 (15) ◽  
pp. 6217-6228 ◽  
Author(s):  
Chengyou Cao ◽  
Ying Zhang ◽  
Zhenbo Cui ◽  
Shuwei Feng ◽  
Tingting Wang ◽  
...  

2020 ◽  
Author(s):  
Han-Wen Deng ◽  
Xin-Fu Bai ◽  
Ping Zhu ◽  
Yu-Meng Lu ◽  
Lei Ji ◽  
...  

Abstract Background Grazing exclusion is a common grassland management strategy for restoring degraded grasslands. Its effectiveness on optimizing plant species community, increasing vegetation diversity and biomass, improving soil fertility, has been widely documented in literatures. However, little is known on the responses of the absolute abundance and the ecological functions of soil bacterial community to long-term grazing exclusion. Result In this study, the absolute abundance, diversity, and ecological functions of soil bacterial community were determined by the high-throughput absolute quantitative sequencing technology on a long-term grazing exclusion (40 years, GE) area and three free grazing areas (FGs) within a Leymus chinensis steppe of Inner Mongolia, China, and analyzed the driving forces leading to the variations in soil bacterial community and functions. Our results showed that there was significantly higher soil bacterial abundance in the GE than the FGs along with corresponding variations in vegetation and soil properties. With the decrease of vegetation aboveground biomass, the absolute abundance of soil bacterial community also decreased. Among the phyla of the soil bacterial communities, the relative abundances of Chloroflexi and Firmicutes phyla were especially lower, and that of Verrucomicrobia phylum was higher in the GE than the FGs; the absolute abundances of Euryarchaeota and Microgenomates phyla were especially higher in the GE than the FGs. Conclusions This study suggested that long-term grazing exclusion significantly increased the absolute abundance, changed soil bacterial composition, and especially enhanced bacterial motility and chemotaxis. In particular, soil organic matter was the important agent to influence and connect vegetation and soil. This work will enrich our understanding of the responses of absolute abundance, diversity, and function of the soil bacterial community to long-term grazing exclusion, and help the evaluation of grassland degradation degree and restoration strategy effectiveness.


2006 ◽  
Vol 72 (2) ◽  
pp. 1684-1687 ◽  
Author(s):  
L. Ranjard ◽  
L. Lignier ◽  
R. Chaussod

ABSTRACT In this study we evaluated the short-term effects of copper, cadmium, and mercury, added singly or in combination at different doses, on soil bacterial community structure using the bacterial automated ribosomal intergenic spacer analysis (B-ARISA) fingerprinting technique. Principal-component analysis of B-ARISA profiles allowed us to deduce the following order of impact: (Cu + Cd + Hg) >> Hg ≥ Cd > Cu. These results demonstrated that there was a cumulative effect of metal toxicity. Furthermore, the trend of modifications was consistent with the “hump-backed” relationships between biological diversity and disturbance described by Giller et al. (K. E. Giller, E. Witler, and S. P. McGrath, Soil Biol. Biochem. 30:1389-1414, 1998).


2018 ◽  
Vol 124 ◽  
pp. 95-103 ◽  
Author(s):  
Newton Z. Lupwayi ◽  
William E. May ◽  
Derrick A. Kanashiro ◽  
Renee M. Petri

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