Asynchronous responses of soil carbon dioxide, nitrous oxide emissions and net nitrogen mineralization to enhanced fine root input
文献类型：期刊论文
| 作者 | Hu, Xiaokang; Liu, Lingli1; Zhu, Biao; Du, Enzai; Hu, Xueyang; Li, Peng; Zhou, Zhang; Ji, Chengjun; Zhu, Jiangling; Shen, Haihua1 |
| 刊名 | SOIL BIOLOGY & BIOCHEMISTRY
 |
| 出版日期 | 2016 |
| 卷号 | 92 |
| ISSN号 | 0038-0717 |
| 关键词 | Fine root decomposition Soil respiration Soil carbon mineralization Soil nitrogen mineralization Soil incubation |
| DOI | 10.1016/j.soilbio.2015.09.019 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | Soil Science |
| 电子版国际标准刊号 | 1879-3428 |
| 出版地 | OXFORD |
| 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) |
| 语种 | 英语 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| WOS记录号 | WOS:000367487700008 |
| 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] |
| 源URL | [http://ir.ibcas.ac.cn/handle/2S10CLM1/24567]  |
| 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 |
| 推荐引用方式 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. |
| 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. |
| 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). |
入库方式： OAI收割
来源：植物研究所
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