Wang Dan1; He Nianpeng1; Wang Qing2; Lu Yuliang3; Wang Qiufeng1; Xu Zhiwei1; Zhu Jianxing1
Source Publicationpedosphere
AbstractDecomposition of soil organic matter(SOM) is of importance for CO_2 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 ?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= 1 425:10, P < 0:001), soil moisture(F= 1 327:65, P < 0:001), and elevation(F= 1 937:54, 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 ?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.
Document Type期刊论文
2.Agricultural University of Anhui
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Wang Dan,He Nianpeng,Wang Qing,et al. effectsoftemperatureandmoistureonsoilorganicmatterdecompositionalongelevationgradientsonthechangbaimountainsnortheastchina[J]. pedosphere,2016,26(3):399.
APA Wang Dan.,He Nianpeng.,Wang Qing.,Lu Yuliang.,Wang Qiufeng.,...&Zhu Jianxing.(2016).effectsoftemperatureandmoistureonsoilorganicmatterdecompositionalongelevationgradientsonthechangbaimountainsnortheastchina.pedosphere,26(3),399.
MLA Wang Dan,et al."effectsoftemperatureandmoistureonsoilorganicmatterdecompositionalongelevationgradientsonthechangbaimountainsnortheastchina".pedosphere 26.3(2016):399.
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