Q(10) values vary with different kinetic properties of C mineralization

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Q(10) values vary with different kinetic properties of C mineralization
	Wu, Jiabing; Shi, Rongjiu; Li, Xiangzhen; Bai, Zhen; Lin, Junjie; Chen, Baodong
刊名	PEDOBIOLOGIA
	2017
卷号	63 期号:6 页码:8-13
关键词	c Mineralization Kinetic Property Temperature Sensitivity Forest Soil
英文摘要	Temperature response quotient (Q(10)) is a critical parameter for evaluating global additional carbon (C) release with climate change. However, its value is usually derived from time span or instantaneous rate or cumulative amount of C flux, giving a very one-sided account of thermal sensitivity of C cycling. Through a 117-day laboratory incubation study, we estimated Q(10) values simultaneously with the labile (a(0)) and recalcitrant C proportions and their rate constants, and then tested for any variances of these kinetic properties in different vegetation stands, soil horizons, aeration statuses, and thermal settings (i.e., diurnally-varying, constant low and constant high temperatures). A regularly varying temperature regime increased the exploitation of labile C resources (i.e., high a0) and required longer time spans (i.e., low rate constants). The constant high temperature induced the exhaustive depletion of the labile C pool and motivated a very rapid and short-term C mineralization process. The constant low temperature treatment was characterized by the lowest a(0) but by medium rate constants because low temperature slowed the C mineralization processes but retained high level of the original C processing diversity. Therefore, a(0), and the rate constants showed discrepancies in their temperature sensitivities as revealed by pairwise comparisons of temperature regimes. Such discrepancies were also supported by pairwise comparisons of aeration statuses, forest stands and soil horizons. The Q(10) bias between C mineralization a(0) and rate constants in this laboratory experiment is attributed to the inherently distinct properties of these two parameters, as a(0) and its Q(10) are closely correlated with the sizes of the easily available C pool, while rate constants and their Q(10), variances explain the temporal scale of the same C mineralization process. Our findings suggest a combined application of a(0) and rate constants for exploring the temperature sensitivity of C mineralization in future studies.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39075]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wu, Jiabing,Shi, Rongjiu,Li, Xiangzhen,et al. Q(10) values vary with different kinetic properties of C mineralization[J]. PEDOBIOLOGIA,2017,63(6):8-13.
APA	Wu, Jiabing,Shi, Rongjiu,Li, Xiangzhen,Bai, Zhen,Lin, Junjie,&Chen, Baodong.(2017).Q(10) values vary with different kinetic properties of C mineralization.PEDOBIOLOGIA,63(6),8-13.
MLA	Wu, Jiabing,et al."Q(10) values vary with different kinetic properties of C mineralization".PEDOBIOLOGIA 63.6(2017):8-13.