the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Soil organic carbon (SOC) accumulation in rice paddies under long-term agro-ecosystem experiments in southern China – VI. Changes in microbial community structure and respiratory activity
Abstract. Biological stabilization within accumulated soil organic carbon (SOC) has not been well understood, while its role in physical and chemical protection as well as of chemical recalcitrance had been addressed in Chinese rice paddies. In this study, topsoil samples were collected and respiratory activity measured in situ following rice harvest under different fertilization treatments of three long-term experimental sites across southern China in 2009. The SOC contents, microbial biomass carbon (SMBC) and nitrogen (SMBN) were analysed using chemical digestion and microbial community structure assessment via clony dilute plate counting methods. While SOC contents were consistently higher under compound chemical fertilization (Comp-Fert) or combined organic and inorganic fertilization (Comb-Fert) compared to N fertilization only (N-Fert), there was significantly higher fungal-bacterial ratio under Comb-Fert than under N-Fert and Comp-Fert. When subtracting the background effect under no fertilization treatment (Non-Fert), the increase both in SMBC and SMBN under fertilization treatment was found very significantly correlated to the increase in SOC over controls across the sites. Also, the ratio of culturable fungal to bacterial population numbers (F/B ratio) was well correlated with soil organic carbon contents in all samples across the sites studied. SOC accumulation favoured a build-up the microbial community with increasing fungal dominance in the rice paddies under fertilization treatments. While soil respiration rates were high under Comb-Fert as a result of enhanced microbial community build-up, the specific soil respiratory activity based on microbial biomass carbon was found in a significantly negatively correlation with the SOC contents for overall samples. Thus, a fungal-dominated microbial community seemed to slow SOC turnover, thereby favouring SOC accumulation under Comp-Fert or under Comb-Fert in the rice paddies. Therefore, the biological stabilization process is of importance in SOC sequestration in the rice paddies, operating with physical and chemical protection and chemical recalcitrance. However, sufficient understanding and prediction of SOM dynamics needs further quantitative characterization of the simultaneous operation of several mechanisms.
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RC C1076: 'Review of Rice soil SOC accumulation and microbial community changes', Anonymous Referee #1, 16 May 2011
- AC C1677: 'Responses to Reviewer 1#', Genxing Pan, 26 Jun 2011
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RC C1253: 'Soil organic carbon (COS) accumulation in rice paddies under long-term argo-ecosystem experiments in southern China - VI. Changes in microbial community structure and respiratory activity', Anonymous Referee #2, 24 May 2011
- AC C1681: 'Responses to Reviewer 2#', Genxing Pan, 26 Jun 2011
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RC C1076: 'Review of Rice soil SOC accumulation and microbial community changes', Anonymous Referee #1, 16 May 2011
- AC C1677: 'Responses to Reviewer 1#', Genxing Pan, 26 Jun 2011
-
RC C1253: 'Soil organic carbon (COS) accumulation in rice paddies under long-term argo-ecosystem experiments in southern China - VI. Changes in microbial community structure and respiratory activity', Anonymous Referee #2, 24 May 2011
- AC C1681: 'Responses to Reviewer 2#', Genxing Pan, 26 Jun 2011
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Cited
11 citations as recorded by crossref.
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- Physical and chemical stabilization of soil organic carbon along a 500-year cultived soil chronosequence originating from estuarine wetlands: Temporal patterns and land use effects J. Cui et al. 10.1016/j.agee.2014.06.013
- Does metal pollution matter with C retention by rice soil? R. Bian et al. 10.1038/srep13233
- Long-term changes in topsoil chemical properties under centuries of cultivation after reclamation of coastal wetlands in the Yangtze Estuary, China J. Cui et al. 10.1016/j.still.2012.03.009
- Microbial activity promoted with organic carbon accumulation in macroaggregates of paddy soils under long-term rice cultivation Y. Liu et al. 10.5194/bg-13-6565-2016
- Root-Derived Short-Chain Suberin Diacids from Rice and Rape Seed in a Paddy Soil under Rice Cultivar Treatments H. Ji et al. 10.1371/journal.pone.0127474
- Impact of Long-Term Fertilization on Community Structure of Ammonia Oxidizing and Denitrifying Bacteria Based on amoA and nirK Genes in a Rice Paddy from Tai Lake Region, China Z. JIN et al. 10.1016/S2095-3119(14)60784-X