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https://hdl.handle.net/2440/105619
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dc.contributor.author | NGUYEN, T. | - |
dc.contributor.author | MARSCHNER, P. | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Pedosphere, 2017; 27(1):76-85 | - |
dc.identifier.issn | 1002-0160 | - |
dc.identifier.issn | 2210-5107 | - |
dc.identifier.uri | http://hdl.handle.net/2440/105619 | - |
dc.description.abstract | Microbial activity and nutrient release are known to be influenced by organic matter properties, but it is difficult to separate the effect of C/N ratio from that of C/P ratio because in most plant residues both ratios are either high or low. An incubation experiment was conducted to investigate the effects of reducing the C/N and C/P ratios of slowly decomposable plant residues (young eucalyptus leaves, mature wheat straw, and sawdust) to those of rapidly decomposable residues (young kikuyu shoots) on soil respiration, microbial biomass, and N and P availability. The C/N and C/P ratios of the former were adjusted to 15 and 89, respectively, by adding N as (NH4)2SO4, P as KH2PO4 or both and residues were added at 10 g C kg−1 to a silt loam. Soil respiration was measured over 21 d; microbial biomass C (MBC) and available N and P were measured on days 0, 7, and 21. Compared to the unamended soil, addition of kikuyu increased cumulative respiration 20–fold, MBC concentration 4 to 8–fold, and available P concentration up to 4–fold, whereas the increase in available N concentration was small and transient. Cumulative respiration and MBC concentration were low in the sawdust–amended soil and were not influenced by reducing the C/N and C/P ratios. Cumulative respiration with original wheat and eucalyptus was 30%–40% of that with kikuyu. Reducing the C/N ratio alone or both C/N and C/P ratios increased cumulative respiration and MBC concentration 2–fold compared to the original wheat and eucalyptus, whereas reducing the C/P ratio had little effect. Throughout the experiment, the available N concentration after addition of residues with reduced C/N ratio increased in the following order of eucalyptus < wheat < sawdust. By independently lowering the C/N and C/P ratios, microbial activity was more limited by C and N than P. However, lowering the C/N ratio of very slowly decomposable sawdust had no effect on soil respiration and MBC concentration, suggesting that other properties such as concentration of poorly decomposable C compounds limited decomposition. | - |
dc.description.statementofresponsibility | Trung Ta Nguyen and Petra Marschner | - |
dc.language.iso | en | - |
dc.publisher | Elsevier B.V. and Science Press | - |
dc.rights | © 2017 Soil Science Society of China | - |
dc.source.uri | http://dx.doi.org/10.1016/s1002-0160(17)60297-2 | - |
dc.subject | C/N ratio; C/P ratio; microbial activity; nutrient immobilisation; nutrient mineralisation | - |
dc.title | Soil respiration, microbial biomass and nutrient availability in soil after addition of residues with adjusted N and P concentrations | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1016/S1002-0160(17)60297-2 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | MARSCHNER, P. [0000-0001-6808-0244] | - |
Appears in Collections: | Aurora harvest 3 Environment Institute publications |
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