Redox control on carbon mineralization and dissolved organic matter along a chronosequence of paddy soils

被引:70
|
作者
Hanke, A. [1 ]
Cerli, C. [1 ]
Muhr, J. [2 ]
Borken, W. [3 ]
Kalbitz, K. [1 ]
机构
[1] Univ Amsterdam, Dept Earth Surface Sci, Inst Biodivers & Ecosyst Dynam, NL-1090 GE Amsterdam, Netherlands
[2] Max Planck Inst Biogeochem, D-07701 Jena, Germany
[3] Univ Bayreuth, Dept Soil Ecol, D-95440 Bayreuth, Germany
关键词
MICROBIAL COMMUNITIES; FOREST SOILS; ACCUMULATION; CHINA; BIODEGRADATION; REDUCTION; DIVERSITY; DYNAMICS; WETLAND; FIELD;
D O I
10.1111/ejss.12042
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Paddy soils are subjected to periodically changing redox conditions. In order to understand better the redox control on long-term carbon turnover, we assessed carbon mineralization and dissolved organic carbon (DOC) of paddy topsoils sampled along a chronosequence spanning 2000years of rice cultivation. Non-paddy soils were used as references. We exposed soils to alternating redox conditions for 12weeks in incubation experiments. Carbon mineralization of paddy soils was independent of redox conditions. Anoxic conditions caused increasing DOC concentrations for paddy soils, probably because of desorption induced by increasing pH. We assume desorption released older, previously stabilized carbon, which then was respired by a microbial community well adapted to anoxic conditions. This assumption is supported by the C-14 signatures of respired CO2, indicating larger mineralization of older carbon under anoxic than under oxic conditions. The increasing DOC concentrations under anoxic conditions did not result in an equivalent increase in carbon mineralization, possibly because of little reducible iron oxide. Therefore, net DOC and CO2 production were not positively related under anoxic conditions. The overall 20-75% smaller carbon mineralization of paddy soils than of non-paddy soils resulted from less respiration under oxic conditions. We conclude that carbon accumulation in paddy as well as in other wetland soils results from a microbial community well adapted to anoxic conditions, but less efficient in mineralizing carbon during transient oxic periods. Carbon accumulation might be even larger when mineralization under anoxic conditions is restricted by a lack of alternative electron acceptors.
引用
收藏
页码:476 / 487
页数:12
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