Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands
Wang, Q; Wang, D; Wen, XF; Yu, GR; He, NP; Wang, RF
2015
Source PublicationPLOS ONE
ISSN1932-6203
Volume10Issue:2Pages:-
AbstractThe principle of enzyme kinetics suggests that the temperature sensitivity (Q10) of soil organic matter (SOM) decomposition is inversely related to organic carbon (C) quality, i.e., the C quality-temperature (CQT) hypothesis. We tested this hypothesis by performing laboratory incubation experiments with bulk soil, macroaggregates (MA, 250-2000 mu m), microaggregates (MI, 53-250 mu m), and mineral fractions (MF, < 53 mu m) collected from an Inner Mongolian temperate grassland. The results showed that temperature and aggregate size significantly affected on SOM decomposition, with notable interactive effects (P < 0.0001). For 2 weeks, the decomposition rates of bulk soil and soil aggregates increased with increasing incubation temperature in the following order: MA > MF > bulk soil > MI(P < 0.05). The Q10 values were highest for MA, followed (in decreasing order) by bulk soil, MF, and MI. Similarly, the activation energies (Ea) for MA, bulk soil, MF, and MI were 48.47, 33.26, 27.01, and 23.18 KJ mol(-1), respectively. The observed significant negative correlations between Q10 and C quality index in bulk soil and soil aggregates (P < 0.05) suggested that the CQT hypothesis is applicable to soil aggregates. Cumulative C emission differed significantly among aggregate size classes (P < 0.0001), with the largest values occurring in MA (1101 mu g g(-1)), followed by MF (976 mu g g(-1)) and MI (879 mu g g(-1)). These findings suggest that feedback from SOM decomposition in response to changing temperature is closely associated withsoil aggregation and highlights the complex responses of ecosystem C budgets to future warming scenarios.
SubtypeJournal
Subject AreaScience & Technology - Other Topics
WOS Subject ExtendedMultidisciplinary Sciences
WOS KeywordORGANIC-MATTER DECOMPOSITION ; ARCTIC TUNDRA SOILS ; CARBON DECOMPOSITION ; MICROBIAL BIOMASS ; C SEQUESTRATION ; CLIMATE-CHANGE ; LAND-USE ; FRACTIONS ; RESPIRATION ; TURNOVER
Indexed BySCI
Language英语
WOS IDWOS:000350061500034
PublisherPUBLIC LIBRARY SCIENCE
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44448
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Wang, Q,Wang, D,Wen, XF,et al. Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands[J]. PLOS ONE,2015,10(2):-.
APA Wang, Q,Wang, D,Wen, XF,Yu, GR,He, NP,&Wang, RF.(2015).Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands.PLOS ONE,10(2),-.
MLA Wang, Q,et al."Differences in SOM Decomposition and Temperature Sensitivity among Soil Aggregate Size Classes in a Temperate Grasslands".PLOS ONE 10.2(2015):-.
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