Decoupled linkage between soil carbon and nitrogen mineralization among soil depths in a subtropical mixed forest

doi:10.1016/j.soilbio.2017.02.009

CORC > 武汉植物园 > 中国科学院武汉植物园

	Decoupled linkage between soil carbon and nitrogen mineralization among soil depths in a subtropical mixed forest
	Tian, Qiuxiang 1; Wang, Xinggang 1,2; Wang, Dongya 1,2; Wang, Min 1,2; Liao, Chang 1,2; Yang, Xiaolu 1; Liu, Feng 1
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2017-06-01
卷号	109 页码:135-144
关键词	Deep soil C mineralization Net N mineralization Soil organic carbon Warming Soil microbial community
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2017.02.009
英文摘要	Deep soil stores a large amount of organic carbon (C) and nitrogen (N). However, little is known regarding the interactions between soil C and net N mineralization in deep soil, which complicates the prediction of ecosystem C and N dynamics. In this study, a 150-day laboratory soil incubation experiment was performed under 20 degrees C and 25 degrees C to investigate the influence of soil depth and warming on C and net N mineralization and their relationship. Soils were collected from a Hapludalfs profile in a subtropical forest with three depth intervals: 0-10 (topsoil), 10-30 (midsoil), and 30-60 cm (subsoil). Soil microbial community-level physiological profiling (CLPP) was conducted to investigate the role of the microbial community in C and N mineralization. The results demonstrated that both C and net N mineralization rates in subsoil were significantly lower than in topsoil. Compared to topsoil, subsoil had lower temperature sensitivity of C mineralization and relatively higher temperature sensitivity of net N mineralization. Cumulative soil C and net N mineralized were positively correlated in topsoil with the mineralized N per mineralized C showed as 0.19 and 0.31 at 20 degrees C and 25 degrees C, respectively. However, there was no significant correlation between cumulative soil C and net N mineralized in subsoil due to the low amount of net N mineralization. The lack of labile C source and degradable organic N were believed to limit the net N mineralization in subsoil. The microbial community in topsoil used relatively more easily decomposable carbohydrates and carboxylic acids, which favored C mineralization. In contrast, the microbial community in subsoil had relatively high utilization of amino acids (N-containing substrates), which indicated there was N limitation. This distinguished substrate utilization patterns of microbial communities could explain the observed C and N mineralization rates among the soil depths, and suggests that the microbial community played an important role in soil C and N mineralization. The decoupled relationships between soil C and net N mineralization in deep soil and their differentiated responses to warmer temperatures among soil depths indicated that deep soil should be considered separately from topsoil for ecosystem C and N cycling, especially for ecosystem C dynamic models. (C) 2017 Elsevier Ltd. All rights reserved.
资助项目	Natural Science Foundation of China[31270515] ; Natural Science Foundation of China[31400463] ; Chinese National Key Development Program for Basic Research[2014CB954004] ; China Postdoctoral Science Foundation funded project[2015M570673]
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000397691700013
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/1365]
专题	中国科学院武汉植物园
通讯作者	Liu, Feng
作者单位	1.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Tian, Qiuxiang,Wang, Xinggang,Wang, Dongya,et al. Decoupled linkage between soil carbon and nitrogen mineralization among soil depths in a subtropical mixed forest[J]. SOIL BIOLOGY & BIOCHEMISTRY,2017,109:135-144.
APA	Tian, Qiuxiang.,Wang, Xinggang.,Wang, Dongya.,Wang, Min.,Liao, Chang.,...&Liu, Feng.(2017).Decoupled linkage between soil carbon and nitrogen mineralization among soil depths in a subtropical mixed forest.SOIL BIOLOGY & BIOCHEMISTRY,109,135-144.
MLA	Tian, Qiuxiang,et al."Decoupled linkage between soil carbon and nitrogen mineralization among soil depths in a subtropical mixed forest".SOIL BIOLOGY & BIOCHEMISTRY 109(2017):135-144.