Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China

doi:10.1016/S1671-2927(11)60134-X

Journal of Integrative Agriculture ›› 2011, Vol. 10 ›› Issue (9): 1410-1418.DOI: 10.1016/S1671-2927(11)60134-X

Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China

HAO Rui-jun, LI Zhong-pei, CHE Yu-ping

1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
2.Shanghai Institute of Landscape Gardening

出版日期:2011-09-01 发布日期:2011-09-09
通讯作者: Correspondence LI Zhong-pei, Professor, Tel: +86-25-86881323, Fax: +86-25-86881000, E-mail: zhpli@mail.issas.ac.cn
基金资助:
This study was financially supported by the NationalNatural Science Foundation of China (40471066) andthe Natural Science Foundation of Jiangsu Province,China (BK2007266). Authors are grateful to Dr. HanFengxiang, Diagnostic Instrumentation and AnalysisLaboratory, Mississippi State University, USA, for Englishediting and helpful comments.

Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China

HAO Rui-jun, LI Zhong-pei, CHE Yu-ping

1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
2.Shanghai Institute of Landscape Gardening

Online:2011-09-01 Published:2011-09-09
Contact: Correspondence LI Zhong-pei, Professor, Tel: +86-25-86881323, Fax: +86-25-86881000, E-mail: zhpli@mail.issas.ac.cn
Supported by:
This study was financially supported by the NationalNatural Science Foundation of China (40471066) andthe Natural Science Foundation of Jiangsu Province,China (BK2007266). Authors are grateful to Dr. HanFengxiang, Diagnostic Instrumentation and AnalysisLaboratory, Mississippi State University, USA, for Englishediting and helpful comments.

摘要/Abstract

摘要： Moisture regime plays a crucial role in the mineralization of soil organic carbon (SOC). In this paper, the dynamics of SOCmineralization in typical paddy soils of Changshu, Jiangsu Province, China, was investigated by incubation test inlaboratory. The differences in SOC mineralization under aerobic and submerged conditions of paddy soils were alsostudied. Results showed that the daily mineralization of SOC under different moisture regimes was significantly differentin the whole incubation period, at the beginning of the incubation, it decreased quickly under aerobic condition, butincreased rapidly under submerged condition, and both remained constant after 10 d of incubation. The differences inSOC mineralization were found to be mainly at the beginning period of the incubation and decreased along with theincubation time. Thus, the difference was not significantly different at the later incubation period. The respirationintensity, daily and cumulative mineralization of SOC under aerobic condition was 2.26-19.11, 0.96-2.41, and 0.96-2.41 timesthan those under submerged condition, respectively. Statistic analyses showed that the higher the contents of microbialbiomass carbon and nitrogen, the more significant difference in respiration intensity between aerobic and submergedconditions, but the higher the contents of microbial biomass nitrogen and dissolved organic carbon, the more significantdifference in daily mineralization of SOC between the two conditions. The decrease in soil microbial activity undersubmerged condition was the main reason leading to the decrease in respiration intensity, but the decrease in SOCmineralization was also correlated with the changes in dissolved organic carbon over the whole incubation period.

关键词: moisture regime, paddy soil, SOC mineralization, aerobic condition, submerged condition, difference

Abstract: Moisture regime plays a crucial role in the mineralization of soil organic carbon (SOC). In this paper, the dynamics of SOCmineralization in typical paddy soils of Changshu, Jiangsu Province, China, was investigated by incubation test inlaboratory. The differences in SOC mineralization under aerobic and submerged conditions of paddy soils were alsostudied. Results showed that the daily mineralization of SOC under different moisture regimes was significantly differentin the whole incubation period, at the beginning of the incubation, it decreased quickly under aerobic condition, butincreased rapidly under submerged condition, and both remained constant after 10 d of incubation. The differences inSOC mineralization were found to be mainly at the beginning period of the incubation and decreased along with theincubation time. Thus, the difference was not significantly different at the later incubation period. The respirationintensity, daily and cumulative mineralization of SOC under aerobic condition was 2.26-19.11, 0.96-2.41, and 0.96-2.41 timesthan those under submerged condition, respectively. Statistic analyses showed that the higher the contents of microbialbiomass carbon and nitrogen, the more significant difference in respiration intensity between aerobic and submergedconditions, but the higher the contents of microbial biomass nitrogen and dissolved organic carbon, the more significantdifference in daily mineralization of SOC between the two conditions. The decrease in soil microbial activity undersubmerged condition was the main reason leading to the decrease in respiration intensity, but the decrease in SOCmineralization was also correlated with the changes in dissolved organic carbon over the whole incubation period.

Key words: moisture regime, paddy soil, SOC mineralization, aerobic condition, submerged condition, difference

HAO Rui-jun, LI Zhong-pei, CHE Yu-ping. Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China[J]. Journal of Integrative Agriculture, 2011, 10(9): 1410-1418.

HAO Rui-jun , LI Zhong-pei , CHE Yu-ping . Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China[J]. Journal of Integrative Agriculture, 2011, 10(9): 1410-1418.

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Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China

Differences in Organic C Mineralization Between Aerobic and SubmergedConditions in Paddy Soils of Southern Jiangsu Province, China

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