Temperature sensitivity of decomposition of soil organic matter fractions increases with their turnover time

doi:10.1002/ldr.3477

	Temperature sensitivity of decomposition of soil organic matter fractions increases with their turnover time
	Jia, Yufu 1; Kuzyakov, Yakov 2,3,4,5; Wang, Guoan ; Tan, Wenbing 6; Zhu, Biao 7; Feng, Xiaojuan1
	2020
发表期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
卷号	31 期号:5 页码:632-645
摘要	Soil organic carbon (SOC) is an indicator of soil fertility. Global warming accelerates SOC decomposition, consequently, resulting in land degradation. Characterization of the response of SOC decomposition to temperature is important for predicting land development. A simulation model based on temperature sensitivity (Q(10)) of SOC decomposition has been used to predict SOC response to climate warming. However, uncertain Q(10) leads to substantial uncertainties in the predictions. A major uncertainty comes from the interference of rainfall. To minimize this interference, we sampled surface (0-5 cm) soils along an isohyet across a temperature gradient in the Qinghai-Tibetan Plateau. The Q(10) of bulk soil and the four soil fractions, such as light fraction (LightF), particulate organic matter (POM), hydrolyzable fraction (HydrolysF), and recalcitrant fraction (RecalcitF), were studied by C-14 dating. Turnover time follows the order: LightF < POM < bulk soil < HydrolysF < RecalcitF. The Q(10) follows the order: LightF (1.0) = POM (1.0) < HydrolysF (3.63) < bulk soil (5.93) < RecalcitF (7.46). This indicates that stable fractions are much more sensitive to temperature than labile fractions. We also suggest that protection mechanisms rather than molecular composition regulate SOC turnover. A new concept 'protection sensitivity' of SOC decomposition was proposed. Protection sensitivity relates to protection type and primarily controls Q(10) variation. A simulation model based on the Q(10) of individual fractions predicted SOC change and land development in the Qinghai-Tibetan Plateau in the next 100 years much effectively as compared to simulations based on one-pool model (Q(10) = 2) or bulk soil (Q(10) = 5.93).
关键词	C-14 isotope global warming SOC decomposition soil quality temperature sensitivity (Q(10))
学科领域	Environmental Sciences ; Soil Science
DOI	10.1002/ldr.3477
收录类别	SCI
语种	英语
WOS关键词	CARBON DECOMPOSITION ; PERMAFROST CARBON ; RADIOCARBON ; CLIMATE ; STABILIZATION ; RESPIRATION ; INCUBATION ; LABILE ; POOLS ; MECHANISMS
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
WOS记录号	WOS:000505586100001
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1099-145X
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41772171] ; RUDN University program 5-100 ; Government Program of Competitive Growth of Kazan Federal University
作者邮箱	gawang@cau.edu.cn
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21959
专题	植被与环境变化国家重点实验室
作者单位	1.China Agr Univ, Coll Resources & Environm Sci, Dept Environm Sci & Engn, Beijing Key Lab Farmland Soil Pollut Prevent & Re, Beijing 100193, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100193, Peoples R China 3.Univ Gottingen, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany 4.Univ Gottingen, Dept Agr Soil Sci, D-37077 Gottingen, Germany 5.Kazan Fed Univ, Inst Environm Sci, Kazan 420049, Russia 6.RUDN Univ, Agrotechnol Inst, Moscow 117198, Russia 7.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China 8.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Jia, Yufu,Kuzyakov, Yakov,Wang, Guoan,et al. Temperature sensitivity of decomposition of soil organic matter fractions increases with their turnover time[J]. LAND DEGRADATION & DEVELOPMENT,2020,31(5):632-645.
APA	Jia, Yufu,Kuzyakov, Yakov,Wang, Guoan,Tan, Wenbing,Zhu, Biao,&Feng, Xiaojuan.(2020).Temperature sensitivity of decomposition of soil organic matter fractions increases with their turnover time.LAND DEGRADATION & DEVELOPMENT,31(5),632-645.
MLA	Jia, Yufu,et al."Temperature sensitivity of decomposition of soil organic matter fractions increases with their turnover time".LAND DEGRADATION & DEVELOPMENT 31.5(2020):632-645.

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