Effects of Temperature and Moisture on Soil Organic Matter Decomposition Along Elevation Gradients on the Changbai Mountains, Northeast China
Wang, D; He, NP; Wang, Q; Lu, YL; Wang, QF; Xu, ZW; Zhu, JX
2016
Source PublicationPEDOSPHERE
ISSN1002-0160
Volume26Issue:3Pages:399-407
AbstractDecomposition of soil organic matter (SOM) is of importance for CO2 exchange between soil and atmosphere and soil temperature and moisture are considered as two important factors controlling SOM decomposition. In this study, soil samples were collected at 5 elevations ranging from 753 to 2 357 m on the Changbai Mountains in Northeast China, and incubated under different temperatures (5, 10, 15, 20, 25, and 30 degrees C) and soil moisture levels (30%, 60%, and 90% of saturated soil moisture) to investigate the effects of both on SOM decomposition and its temperature sensitivity at different elevations. The results showed that incubation temperature (F = 1425.10, P < 0.001), soil moisture ( F = 1327.65, P < 0.001), and elevation ( F = 1937.54, P < 0.001) all had significant influences on the decomposition rate of SOM. The significant effect of the interaction of incubation temperature and soil moisture on the SOM decomposition rate was observed at all the 5 sampling elevations (P < 0.001). A two-factor model that used temperature and moisture as variables fitted the SOM decomposition rate well (P < 0.001) and could explain 80%-93% of the variation of SOM decomposition rate at the 5 elevations. Temperature sensitivity of SOM decomposition, expressed as the change of SOM decomposition rate in response to a 10 degrees C increase in temperature (Q(10)), was significantly different among the different elevations (P < 0.01), but no apparent trend with elevation was discernible. In addition, soil moisture and incubation temperature both had great impacts on the Q(10) value (P < 0.01), which increased significantly with increasing soil moisture or incubation temperature. Furthermore, the SOM decomposition rate was significantly related to soil total Gram-positive bacteria (R-2 = 0.33, P < 0.01) and total Gram-negative bacteria (R-2 = 0.58, P < 0.001). These findings highlight the importance of soil moisture to SOM decomposition and its Q(10) value, which needs to be emphasized under warming climate scenarios.
SubtypeJournal
KeywordGram-negative bacteria Gram-positive bacteria saturated soil moisture soil respiration temperature sensitivity warming climate scenarios
Subject AreaAgriculture
WOS Subject ExtendedSoil Science
WOS KeywordCLIMATE-CHANGE ; HETEROTROPHIC RESPIRATION ; CARBON MINERALIZATION ; MICROBIAL BIOMASS ; WATER-CONTENT ; FOREST ; SENSITIVITY ; CO2 ; RESPONSES ; RATES
Indexed BySCI
Language英语
WOS IDWOS:000376225100011
PublisherSCIENCE PRESS
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44235
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, D,He, NP,Wang, Q,et al. Effects of Temperature and Moisture on Soil Organic Matter Decomposition Along Elevation Gradients on the Changbai Mountains, Northeast China[J]. PEDOSPHERE,2016,26(3):399-407.
APA Wang, D.,He, NP.,Wang, Q.,Lu, YL.,Wang, QF.,...&Zhu, JX.(2016).Effects of Temperature and Moisture on Soil Organic Matter Decomposition Along Elevation Gradients on the Changbai Mountains, Northeast China.PEDOSPHERE,26(3),399-407.
MLA Wang, D,et al."Effects of Temperature and Moisture on Soil Organic Matter Decomposition Along Elevation Gradients on the Changbai Mountains, Northeast China".PEDOSPHERE 26.3(2016):399-407.
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