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The decomposition of green leaf litter is less temperature sensitive than that of senescent leaf litter: An incubation study
Geoderma ( IF 6.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.geoderma.2020.114691 Renshan Li , Yanzhao Zhang , Dan Yu , Yu Wang , Xingxing Zhao , Ruihan Zhang , Weidong Zhang , Qingkui Wang , Ming Xu , Longchi Chen , Silong Wang , Jianming Han , Qingpeng Yang
Geoderma ( IF 6.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.geoderma.2020.114691 Renshan Li , Yanzhao Zhang , Dan Yu , Yu Wang , Xingxing Zhao , Ruihan Zhang , Weidong Zhang , Qingkui Wang , Ming Xu , Longchi Chen , Silong Wang , Jianming Han , Qingpeng Yang
Abstract In the context of climate change, more frequent and severe extreme climate events are expected, which could lead to increased leaf fall before senescence. The decomposition of those abnormal fallen leaf litters may play a pivotal role in affecting the carbon (C) cycle in terrestrial ecosystems. Nevertheless, how their decomposition responds to temperature increase has rarely been studied, which limits the accurate estimation of the response of soil C dynamics to global warming and associated feedback. In the present study, green leaves (GL) were used to represent abnormal fallen leaf litters, and we compared the temperature sensitivity (Q10) of the decomposition of GL with that of the corresponding senescent litters (SL) from nine species, which are widely distributed in subtropical China. Results showed that GL experienced a faster decomposition than SL. Conversely, the Q10 of GL decomposition was significantly lower than that of SL decomposition. We also found that the Q10 values of litter decomposition correlated positively with the C:N ratio and the lignin:N ratio, which supported the “C quality temperature” hypothesis. Furthermore, Q10 was negatively controlled by phospholipid fatty acids of total microbes, fungi, and bacteria in soils. Experimental warming evidently increased the metabolic quotient of litter decomposition (qCO2); a greater increase occurred in the decomposition of SL rather than that of GL. A positive correlation between Q10 and warming-induced relative change in qCO2 was also detected. We highlighted that the increasing inputs of abnormal fallen leaf litters caused by climate change could decrease the Q10 of litter decomposition.
更新日期：2021-01-01
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