Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland

NWIPB OpenIR

	Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland
	Jia, Juan; Cao, Zhenjiao; Liu, Chengzhu; Zhang, Zhenhua; Lin, Li; Wang, Yiyun; Haghipour, Negar; Wacker, Lukas; Bao, Hongyan; Dittmar, Thorston; Simpson, Myrna J.; Yang, Huan; Crowther, Thomas W.; Eglinton, Timothy, I; He, Jin-Sheng; Feng, Xiaojuan
	2019
发表期刊	GLOBAL CHANGE BIOLOGY
卷号	25 期号:12
摘要	Subsoil contains more than half of soil organic carbon (SOC) globally and is conventionally assumed to be relatively unresponsive to warming compared to the topsoil. Here, we show substantial changes in carbon allocation and dynamics of the subsoil but not topsoil in the Qinghai-Tibetan alpine grasslands over 5 years of warming. Specifically, warming enhanced the accumulation of newly synthesized (C-14-enriched) carbon in the subsoil slow-cycling pool (silt-clay fraction) but promoted the decomposition of plant-derived lignin in the fast-cycling pool (macroaggregates). These changes mirrored an accumulation of lipids and sugars at the expense of lignin in the warmed bulk subsoil, likely associated with shortened soil freezing period and a deepening root system. As warming is accompanied by deepening roots in a wide range of ecosystems, root-driven accrual of slow-cycling pool may represent an important and overlooked mechanism for a potential long-term carbon sink at depth. Moreover, given the contrasting sensitivity of SOC dynamics at varied depths, warming studies focusing only on surface soils may vastly misrepresent shifts in ecosystem carbon storage under climate change.
关键词	deep soil lignin decomposition physical fraction radiocarbon soil organic carbon warming
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/59688
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Jia, Juan,Cao, Zhenjiao,Liu, Chengzhu,et al. Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland[J]. GLOBAL CHANGE BIOLOGY,2019,25(12).
APA	Jia, Juan.,Cao, Zhenjiao.,Liu, Chengzhu.,Zhang, Zhenhua.,Lin, Li.,...&Feng, Xiaojuan.(2019).Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland.GLOBAL CHANGE BIOLOGY,25(12).
MLA	Jia, Juan,et al."Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland".GLOBAL CHANGE BIOLOGY 25.12(2019).