Effects of an integrated rice-crayfish farming system on soil organic carbon, enzyme activity, and microbial diversity in waterlogged paddy soil

Cover crop (CC) management in vineyards increases sustainability by improving soil chemical and biological fertility, but knowledge on its effects in semiarid soils is lacking. This study evaluated the effect of leguminous CC management on soil organic carbon (SOC) sequestration, soil nitrate content and microbial diversity in a semiarid vineyard, in comparison to conventional tillage (CT). SOC and nitrate were monitored during vine-growing season; soil respiration, determined by incubation experiments, microbial biomass and diversity was analyzed after CC burial. The microbial diversity was evaluated by bacterial and fungal automated ribosomal intergenic spacer analysis (ARISA) and high-throughput sequencing of 16SrDNA. CC increased nitrate content and, although it had no relevant effect on SOC, almost doubled its active microbial component, which contributes to SOC stabilization. An unexpected stability of the microbial communities under different soil managements was assessed, fungal diversity being slightly enhanced under CT while bacterial diversity increased under CC. The complete nitrifying genus Nitrospira and plant growth-promoting genera were increased under CC, while desiccation-tolerant genera were abundant in CT. Findings showed that temporary CC applied in semiarid vineyards does not optimize the provided ecosystem services, hence a proper management protocol for dry environments should be set up.

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Characteristics of typical paddy soil organic carbon fractions and their main control factors in the Yangtze River Delta

Acta Ecologica Sinica ◽

10.5846/stxb201501190152 ◽

2016 ◽

Vol 36 (15) ◽

Cited By ~ 1

Author(s):

王玺洋 WANG Xiyang ◽

于东升 YU Dongsheng ◽

廖丹 LIAO Dan ◽

潘剑君 PAN Jianjun ◽

黄标 HUANG Biao ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Paddy Soil ◽

Yangtze River ◽

Yangtze River Delta ◽

The Yangtze River ◽

Carbon Fractions ◽

Control Factors ◽

Organic Carbon Fractions ◽

The Yangtze River Delta

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The Contribution of Microorganisms to Soil Organic Carbon Accumulation under Fertilization Varies among Aggregate Size Classes

Agronomy ◽

10.3390/agronomy11112126 ◽

2021 ◽

Vol 11 (11) ◽

pp. 2126

Author(s):

Jinjing Lu ◽

Shengping Li ◽

Guopeng Liang ◽

Xueping Wu ◽

Qiang Zhang ◽

...

Keyword(s):

Enzyme Activity ◽

Microbial Biomass ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Aggregate Size ◽

Carbon Accumulation ◽

Community Diversity ◽

C Storage ◽

Soil Aggregate Fractions

Long-term fertilization alters soil microbiological properties and then affects the soil organic carbon (SOC) pool. However, the interrelations of SOC with biological drivers and their relative importance are rarely analyzed quantitatively at aggregate scale. We investigated the contribution of soil microbial biomass, diversity, and enzyme activity to C pool in soil aggregate fractions (>5 mm, 2–5 mm, 1–2 mm, 0.25–1 mm, and <0.25 mm) at topsoil (0–15 cm) from a 27-year long-term fertilization regime. Compared to CK (no fertilization management), NP (inorganic fertilization alone) decreased all of the microbial groups’ biomass, while NPS and NPM (inorganic fertilization plus the incorporation of maize straw or composted cow manure) significantly reduced this negative effect of NP on microbial biomass and increased the microbial contribution to C pool. The results show that microbial variables were significantly correlated with SOC content in >0.25 mm aggregates rather than in <0.25 mm aggregates. Fungal variables (fungal, AM biomass, and F/B ratio) and enzyme activities (BXYL and LAP) in >0.25 mm aggregates explained 21% and 2% of C, respectively. Overall, organic matter addition could contribute to higher C storage by boosting fungal community and enzyme activity rather than by changing microbial community diversity in macro-aggregates.

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The Contribution of Microorganisms to Soil Organic Carbon Stock Under Fertilization Varies among Aggregate Size Classes

10.21203/rs.3.rs-140931/v1 ◽

2021 ◽

Author(s):

Jinjing Lu ◽

Shengping Li ◽

Guopeng Liang ◽

Xueping Wu ◽

Qiang Zhang ◽

...

Keyword(s):

Enzyme Activity ◽

Microbial Community ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Aggregate Size ◽

Community Diversity ◽

C Storage ◽

C Stock ◽

The Impact

Abstract Long term fertilization alters soil microbiological properties and then affects soil organic carbon (SOC) stocks. However, the interrelations of SOC with biological drivers and their relative importance are rarely analyzed quantitatively at aggregate scale. We investigated the contribution of soil microbial biomass, diversity and enzyme activity to C stock in soil aggregate fractions (> 5 mm, 2 − 5 mm, 1 − 2 mm, 0.25 − 1 mm and < 0.25 mm) at topsoil (0–15 cm) from 27-year long term fertilization regime. Compared to CK (no fertilization management), NPS and NPM (inorganic fertilization plus the incorporation of maize straw or composted cow manure) significantly reduced the impact of NP (inorganic fertilizers application alone) on the growth of microbial community, and increased the microbial contribution to C stock. The results showed that microbial variables were significantly correlated with SOC content in > 0.25 mm aggregates rather than in < 0.25 mm aggregates. Fungal variables (fungal, AM biomass, and F/B ratio) and enzyme activities (BXYL and LAP) in > 0.25 mm aggregates explained 21% and 2% on C, respectively. Overall, organic matter (OM) addition could contribute to higher C storage by boosting fungal community and enzyme activity rather than by changing microbial community diversity in macro-aggregates.

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