[1]JIN Zhangli,LIU Gaopeng,ZHOU Mingtao,et al.Soil Enzyme Activity and Microbial Carbon Metabolism Along an Altitudinal Gradient in Grasslands of Karst Mountain[J].Research of Soil and Water Conservation,2020,27(03):37-44.
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Soil Enzyme Activity and Microbial Carbon Metabolism Along an Altitudinal Gradient in Grasslands of Karst Mountain
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
37-44
Column:
目次
Public date:
2020-04-20
- Title:
- Soil Enzyme Activity and Microbial Carbon Metabolism Along an Altitudinal Gradient in Grasslands of Karst Mountain
- Keywords:
- karst mountain grassland; soil enzyme activity; soil microbial carbon metabolism; altitudinal gradient
- CLC:
- Q154
- DOI:
- -
- Abstract:
- In order to clarify soil microbial carbon metabolism and enzyme activity along an altitudinal gradient in grasslands of karst mountain, we used classical statistical analysis and sequencing analysis to study soil microbial carbon metabolism and enzyme activity in the karst mountains for three consecutive years(from 2015 to 2017), and discussed the relationship between microbial community diversity and soil nutrient. The results are as follows.(1)The contents of total carbon, total nitrogen, total potassium, alkali-hydrolyzed nitrogen and available phosphorus in the soils of grasslands at different elevations decrease in the order: medium elevation>low elevation>high elevation, and the contents of total carbon, total nitrogen, total potassium, alkali-hydrolyzed nitrogen and available phosphorus in the soils at different elevations are significantly different (p<0.05). The pH values of soils show an opposite trend, while the difference of total phosphorus in soils is not significant at different elevations (p>0.05).(2)There are significant differences in functional diversity of microbial communities along the altitudinal gradient. The carbon sources mostly used by soil microbes are carbohydrates and carboxylic acids, followed by amino acids, phenolic acids and polymers, the lowest is amines.(3)The Simpson index, Shannon-Wiener index, richness index and McIntosh index gradually increased in the period from 2015 to 2017, following the order: intermediate altitude>high altitude>low altitude.(4)Soil microbiomass carbon, microbial respiration, microbial metabolic entropy, soil glycosidase, chitinase, leucine aminopeptidase, alkaline phosphatase, phenol oxidase and peroxidase assay gradually increased during the period from 2015 to 2017, following the order: intermediate altitude>high altitude>low altitude.(5)Soil microbial biomass carbon, microbial respiration and soil microbial metabolic entropy gradually increased in the period from 2015 to 2017, following the order: intermediate altitude>high altitude>low altitude.(6)Redundancy analysis indicates that the soil microbial carbon metabolism and enzyme activity are different along an altitudinal gradient, and microbial respiration, microbial metabolic entropy have the more positive contribution to soil microbial carbon metabolism, which are the main driving factors on soil microbial carbon metabolism. Soil total carbon and soil total nitrogen are the reasons for variation of soil microbial communities along an altitudinal gradient.
- References:
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Last Update:
2020-04-30