Changes in the soil microbial communities of different soil aggregations after vegetation restoration in a semiarid gras
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https://doi.org/10.1007/s42832-020-0055-1
RESEARCH ARTICLE
Changes in the soil microbial communities of different soil aggregations after vegetation restoration in a semiarid grassland, China Zhijing Xue1, Zhengchao Zhou1, Shaoshan An2 ,* 1 School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China 2 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China
HIGHLIGHTS • The soil aggregate stability increased with increasing duration of vegetation restoration. • Natural restoration has a positve effect on soil microbial diversity that was generally higher in large particle size aggregates, which leads to low environmental stress and strong stability. • Microorganism continually changed their regulation of metabolism pathways as their environment changed. • Environment adaptability influences soil physiological indicators to varying degrees. • After years of natural restoration, the soil microbial community generally transformed from nutrient-rich to heterotroph-dominan.
ARTICLE INFO Article history: Received May 14, 2020 Revised July 9, 2020 Accepted July 29, 2020 Keywords: Vegetation restoration Plant succession Phospholipid fatty acid (PLFA) Soil aggregate fractions Soil microorganism group
GRAPHICAL
ABSTRACT
ABSTRACT Soil aggregate fractions can regulate microbial community composition and structure after vegetation restoration. However, there has been less focus on the effects of soil aggregate fractions on the distributions of microbial communities. Here, we used phospholipid fatty acid (PLFA) analysis to explore the effects of different years of vegetation restoration (a 35-year-old Thymus mongolicus community (Re-35yrs) and a 2-year-old nongrazing grassland (Ug-2yrs)) on microbial communities within different soil aggregate sizes ( < 0.25 mm, 0.25–1 mm, 1–2 mm, 2–3 mm, 3–5 mm and >5 mm). The results indicated that the amount of total PLFA in Re-35yrs was 10 times greater than that in Ug2yrs. The soil aggregate stability increased with increasing duration of vegetation restoration. In Re35yrs, the total PLFA shown an increase as the soil aggregate size increased, and the highest values were observed in 3–5 mm. Ug-2yrs differed from Re-35yrs, the soil microbial diversity was higher in medium particle sizes (1–2 mm and 2–3 mm) and lower in microaggregates ( < 0.25 mm and 0.25– 1 mm) and macroaggregates (3–5 mm and >5 mm). Soil microbial diversity was highest in large particle size aggregates, which resulted in low environmental stress and strong stability. The same tendency was observed in the high values of cyc/prec, S/M and soil organic matter, which indicated a lower turnover speed (F/B) of fungal energy utilization and a higher fixation rate. After years of natural restoration, the soil microbial community generally transformed from nutrient-rich to heterotroph+ – dominant, especially in microaggregates (reflected in the G /G ratio). © Higher Education Press 2020
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