期刊
GEODERMA
卷 202, 期 -, 页码 38-44出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2013.03.005
关键词
Mycorrhiza; Saprotrophic microorganisms; delta C-13; delta N-15; Light fraction organic matter
类别
资金
- University of Al-Baath, Homs, Syria
- Research Training Group 1397 Regulation of soil organic matter and nutrient turnover in organic agriculture of the German Research Foundation (DFG)
It has been demonstrated before that growing pea (Pisum sativum L.) plants reduce the decomposition of N-15 labeled maize residues. This reduction was especially strong in pots planted with the mycorrhizal wild-type Frisson (myc(+)) in comparison with the non-mycorrhizal mutant P2 (myc(-)). The aim of the present experiment was to assess the contribution of AMF and saprotrophic microorganisms to the formation of aggregates and accumulation of C and N as occluded light fraction organic matter in the soil of this pot experiment. In the myc(+) treatment of the size class < 53 mu m, the dry weight yield and the delta C-13 value of soil organic C were significantly higher than in the myc(-) treatment. After application of maize leaf residues, the percentage of dry weight yield generally increased in the two macroaggregate size classes at the expense of the small and large microaggregates. This demonstrates the important role of saprotrophic microorganisms in macroaggregate formation. Consistently, the content of maize-derived C declined significantly in the occluded light fraction of the myc(+) treatment, showing that less plant residues were accumulated in aggregates. Overall, the presence of saprotrophic microorganisms induced aggregate formation and accumulation of C within aggregates. The presence of mycorrhiza did not affect aggregation or soil C partitioning, despite a higher root biomass. It should be further investigated whether the positive effects of the maize-decomposing microorganisms on aggregation persist for longer periods. (c) 2013 Elsevier B.V. All rights reserved.
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