An increasing trend with increasing soil moisture was confirmed for Q 10 of R s in relatively arid environments 48 , 49 .
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Sustained acceleration of soil carbon decomposition observed in a 6-year warming experiment in a warm-temperate forest in southern Japan.
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However, we found marginally significant and significant negative relationships between soil temperature and the normalized- Q 10 for R s ( p = 0.081, R 2 = 0.57) and R hw ( p = 0.041, R 2 = 0.69), respectively ( Fig. 5d ).
Some authors have explained a decreasing trend for the warming effect after several years of warming by hypothesizing depletion of the labile C pools 18 , 19 .