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Asynchronous responses of soil carbon dioxide, nitrous oxide emissions and net nitrogen mineralization to enhanced fine root input
Hu, Xiaokang; Liu, Lingli1; Zhu, Biao; Du, Enzai; Hu, Xueyang; Li, Peng; Zhou, Zhang; Ji, Chengjun; Zhu, Jiangling; Shen, Haihua1; Fang, Jingyun1
2016
发表期刊SOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
卷号92页码:67-78
摘要Global environmental changes can remarkably alter the amount of fine root litter inputs to the soil; these inputs affect soil CO2 and N2O emissions and net N mineralization processes by changing C and N supply to microorganisms. However, how these C and N processes respond to the amount of fine root litter input is yet not known. In this study, a year-long incubation experiment was conducted to investigate the impacts of changes in fine root litter biomass input on soil respiration, N2O emissions, and net N mineralization. Soil samples were obtained from forests of four biomes (boreal, temperate, subtropical, and tropical), and each sample was amended with fine roots from two species (either native tree species or maize roots) with four levels of root biomass input. The cumulative CO2 emissions increased linearly with root input levels, regardless of soil and root litter types. Soil respiration responded strongly to root inputs within the first 100 days and then leveled off. Root inputs retarded soil N2O emissions and net N mineralization, and the length of delay increased with root input levels, except for temperate and subtropical soils amended with tree roots, for which N2O emission dynamics were not altered by root input. Tree roots retarded net N mineralization more intensively than maize roots except for the tropical tree roots. Cumulative N2O emissions increased linearly with root input levels in only some soil type-root species-root input level combinations. Taken together, our results suggest that increased fine root biomass production might result in a linear increase of soil C loss via heterotrophic respiration, indicating that the first-order kinetic functions that have been widely used in the soil C models are still valid for predicting C mineralization rates in response to the changes in the amount of root litter inputs. Fine roots in their initial decomposition stage could be the predominant sources of soil N2O emissions in some but not all terrestrial ecosystems. However, increased fine root input might retard net N mineralization, which might disrupt the temporal pattern of ecosystem N cycling, and thus have important consequences on plant N supply and growth. (C) 2015 Elsevier Ltd. All rights reserved.
关键词Fine root decomposition Soil respiration Soil carbon mineralization Soil nitrogen mineralization Soil incubation
学科领域Soil Science
DOI10.1016/j.soilbio.2015.09.019
收录类别SCI
语种英语
WOS关键词LEAF-LITTER ; GLOBAL PATTERNS ; MICROBIAL BIOMASS ; EXTRACTION METHOD ; DYNAMICS ; DECOMPOSITION ; CLIMATE ; MANIPULATION ; MECHANISMS ; LIMITATION
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号WOS:000367487700008
出版者PERGAMON-ELSEVIER SCIENCE LTD
文献子类Article
出版地OXFORD
EISSN1879-3428
资助机构National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41301236] ; Innovation Group Grant of the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31321061]
作者邮箱jyfang@urban.pku.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/2S10CLM1/25215
专题植被与环境变化国家重点实验室
作者单位1.Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Minist Educ,Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
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GB/T 7714
Hu, Xiaokang,Liu, Lingli,Zhu, Biao,et al. Asynchronous responses of soil carbon dioxide, nitrous oxide emissions and net nitrogen mineralization to enhanced fine root input[J]. SOIL BIOLOGY & BIOCHEMISTRY,2016,92:67-78.
APA Hu, Xiaokang.,Liu, Lingli.,Zhu, Biao.,Du, Enzai.,Hu, Xueyang.,...&Fang, Jingyun.(2016).Asynchronous responses of soil carbon dioxide, nitrous oxide emissions and net nitrogen mineralization to enhanced fine root input.SOIL BIOLOGY & BIOCHEMISTRY,92,67-78.
MLA Hu, Xiaokang,et al."Asynchronous responses of soil carbon dioxide, nitrous oxide emissions and net nitrogen mineralization to enhanced fine root input".SOIL BIOLOGY & BIOCHEMISTRY 92(2016):67-78.
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