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Biotechnology Channel News: The reduction of organic matter content in farmland is one of the important signs of soil degradation, and the straw field is considered to be one of the important means to maintain soil organic matter content and improve soil ecological environment.
the organic matter content of black soil in Northeast China showed obvious regional distribution characteristics, and whether there was any difference in the amount of crop straw returned to the carbon bank of farmland black soil with different organic matter content in the process of decay. Which soil microorganisms are involved in the conversion of crop straw carbon? What are the differences between the microorganisms involved in straw carbon conversion in different black soils? The answers to these questions are helpful to understand the distribution law of organic carbon "south low and north high" in the soil of the black soil in Northeast China, and it is of great guiding significance to the scientific management and maintenance of soil productivity in the black soil.
To this end, Under the guidance of researcher Jin Jian, Lian Tengxiang, Ph.D., Agricultural Molecular Ecology Group, Northeast Institute of Geography and Agricultural Ecology of the Chinese Academy of Sciences, used 13C marking talking technology, on the basis of making it clear that the amount of soybean root residue returned to the black soil carbon bank was greater than the amount of stem and leaf residue (Lian et al., In 2016, Biology and Fertility of Soils further analyzed the conversion of 13C-labeled soybean stalk residues to low, high organic matter content of black soil (SOC content of 14 and 50 g/kg, respectively).
found that the carbon conversion of straw was significantly different in black soil with different organic matter content.
The contribution of the same amount of straw carbon to the organic carbon banks (coarse particle organic carbon, fine particulate organic carbon and mineral-combined organic carbon) is significantly higher than that of the low organic matter content; The effects on the microbiome structure of black soil revealed the response relationship between soil carbon reservoir changes and microbial community structure at genus and OTU levels, and found that Verrucosispora, Xanthomonadales and Steroidobacter responded significantly to straw return in black soil with low organic matter content, while Anaerolineaceae_uncultured was the main responding genus in high organic matter.
addition, the exemplary correspondence (CCA) analysis of soil microbial community structure and factors such as carbon deposition reveals the association between soil bacterial community structure and different SOC carbon reservoirs (Figure 2).
research results provide an important guiding role for the research on straw return strategy and straw carbon conversion mechanism in black soil area.
study was published in the international journals Soil Biology and Fertility and Soil Biology and Biochemistry.
of the work was supported by the Chinese Academy of Sciences" 100-person program (Class A) and the National Natural Science Foundation (41271261, 41201247).
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