Linkages between the soil organic matter fractions and the microbial metabolic functional diversity within a broad-leaved Korean pine forest

Abstract

a b s t r a c tPatterns in the spatial distribution of soil microorganisms and the factors that determine them provide important information about the mechanisms regulating diversity and function of terrestrial ecosystems. The spatial heterogeneity of metabolic functional diversity of soil microorganisms was studied across a 30 Â 40 m plot and at two soil depths (0e10 cm and 10e20 cm) in a natural, mixed broad-leaved Korean pine (Pinus koraiensis) forest soil in the Changbai Mountains. In addition, we assessed the importance of the quantity and quality (indicated by labile soil organic matter fractions) of soil organic matter in smallscale structuring of soil microbial metabolic functional diversity. Microbial metabolic functional diversity was characterized based on the Biolog profile. The results showed that metabolic activity exhibited moderate spatial dependence, while functional diversity had a much stronger spatial dependence. All soil organic matter fractions including total soil organic matter, dissolved organic matter, particulate organic matter explained 15e27% of the variance in microbial functional diversity in the two soil layers. Among all soil organic matter fractions, the labile dissolved organic carbon accounted for the largest amount of variation. Overall, the significant relationship between soil microorganisms and organic matter fractions allows for better understanding the ecological functions governing C cycling and microbial communities in forest ecosystems.

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

“…Soil pH is frequently reported to be a strong factor linked to soil microbial catabolic function in previous studies, such as Zhou et al (2012) and Gartzia-Bengoetxea et al (2016). Soil labile C comprises the most available sources for microorganisms, and many studies have revealed that soil microbial metabolic activities are strongly influenced by available carbon substrates (Burton et al 2010;Tian et al 2015). Similarly, in our study, it was found that microbial C utilization rates positively correlated with soil labile C content in the rhizosphere.…”

Changes in soil microbial community are linked to soil carbon fractions after afforestation

“…In addition, microbial functional diversity in soil, measured as catabolic potential, was affected by the different types of organic C (Degens, 1998). These findings ultimately led to the development of a hypothesis in which SOC fractions played a vital role in structuring soil microbial functional diversity (Tian et al, 2015). Soil microbes, however, also affect C cycling through their effect on soil C of different fractions (Six et al, 2006).…”

Soil bacterial community and functions directly respond to grazing exclusion in a Leymus chinensis steppe of Inner Mongolia, China

“…The enhancement of bacterial chemotaxis indicated that soil bacteria had a higher ability to seek bene ts and avoid harm, so that they could better adapt to the dynamic environment [32], which was also the key for adjusting the structure and composition of the soil microbial community and allowing the successful colonization of a certain soil environment [33]. Therefore, grazing exclusion enhanced the bacterial chemotaxis and motility, and in fact improved some other important ecosystem properties, such as decomposition, nutrient ow rates, and resistance and resilience to disturbances.…”