| Different microbial responses in top- and sub-soils to elevated temperature and substrate addition in a semiarid grassland on the Loess Plateau | |
| Bai, Tongshuo1; Tao, Jinjin1; Li, Zhen1; Shu, Meng1; Yan, Xuebin1; Wang, Peng1; Ye, Chenglong1; Guo, Hui1; Wang, Yi2; Hu, Shuijin1,3 | |
| 通讯作者 | Wang, Yi(wangyi@ieecas.cn) ; Hu, Shuijin(shuijin_hu@hotmail.com) |
| 2019-09-01 | |
| 发表期刊 | EUROPEAN JOURNAL OF SOIL SCIENCE
 |
| ISSN | 1351-0754 |
| 卷号 | 70期号:5页码:1025-1036 |
| 摘要 | The Loess Plateau soil in northwest China originated from wind sediments and is characterized by deep soil profiles and large organic carbon (C) content. Severe soil erosion constantly exposes deep soils to the surface, making the organic C vulnerable to microbial decomposition. Few, however, have so far examined how soil microbial activity and community composition in the deep loess soil respond to perturbations. We examined microbial responses in three layers of a clay-loam loess (topsoil, 0-20 cm; midsoil, 40-60 cm; subsoil, 80-100 cm) to substrate additions (0.8 g glucose-C kg(-1) soil) under two temperature regimes (25 and 35 degrees C). Soil C:N ratio was significantly larger in the subsoil (20.3) than topsoil (7.4). Glucose addition significantly increased CO2 efflux during a 30-day incubation period and the relative magnitude of the increase was four times larger in the subsoil than topsoil. The temperature sensitivity (Q(10)) of soil CO2 efflux increased significantly with soil depth in the absence of glucose addition (i.e., ambient soil), but it decreased under glucose addition. Also, glucose addition significantly increased phenol oxidase and peroxidase activities in the subsoil, which might contribute to the stimulation of microbial CO2 efflux. Composition of the microbial community was more affected by temperature increase in the topsoil, but more responsive to labile C addition in the subsoil. Together, these results indicated that the composition of soil communities and microbial activities in the topsoil and deep soil responded differently to warming and labile C input. Our findings suggest that organic C in deep loess soils can be highly sensitive to environmental changes, emphasizing the need for more long-term monitoring and quantitative assessment of organic C release from this important C pool. Highlights Microbial responses to labile C and warming were examined along a Loess Plateau soil profile. Microbial respiration was more responsive to C addition and warming in deep soil than topsoil. Microbial composition and activity were sensitive to temperature in the topsoil but to labile C in the subsoil. Climate change may facilitate CO2 efflux from deep Loess Plateau soils. |
| 关键词 | carbon mineralization deep soil exposure labile C addition Loess Plateau microbial community composition temperature sensitivity |
| DOI | 10.1111/ejss.12800 |
| 关键词[WOS] | ORGANIC-CARBON DECOMPOSITION ; LABILE CARBON ; COMMUNITY COMPOSITION ; AVAILABILITY ; MATTER ; SENSITIVITY ; PROFILES ; MINERALIZATION ; BACTERIAL ; BIOMASS |
| 收录类别 | SCI ; SCI |
| 语种 | 英语 |
| 资助项目 | Fundamental research funds for the central universities[KYTZ201404] ; National Key R&D Program of China[2017YFC0503902] ; National Natural Science Foundation of China[41671269] ; National Natural Science Foundation of China (NSFC)[31600383] |
| WOS研究方向 | Agriculture |
| 项目资助者 | Fundamental research funds for the central universities ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China (NSFC) |
| WOS类目 | Soil Science |
| WOS记录号 | WOS:000483693100008 |
| 出版者 | WILEY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ieecas.cn/handle/361006/13402 |
| 专题 | 生态环境研究室 |
| 通讯作者 | Wang, Yi; Hu, Shuijin |
| 作者单位 | 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Ecosyst Ecol Lab, Nanjing 210095, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China 3.North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC 27695 USA |
| 推荐引用方式 GB/T 7714 | Bai, Tongshuo,Tao, Jinjin,Li, Zhen,et al. Different microbial responses in top- and sub-soils to elevated temperature and substrate addition in a semiarid grassland on the Loess Plateau[J]. EUROPEAN JOURNAL OF SOIL SCIENCE,2019,70(5):1025-1036. |
| APA | Bai, Tongshuo.,Tao, Jinjin.,Li, Zhen.,Shu, Meng.,Yan, Xuebin.,...&Hu, Shuijin.(2019).Different microbial responses in top- and sub-soils to elevated temperature and substrate addition in a semiarid grassland on the Loess Plateau.EUROPEAN JOURNAL OF SOIL SCIENCE,70(5),1025-1036. |
| MLA | Bai, Tongshuo,et al."Different microbial responses in top- and sub-soils to elevated temperature and substrate addition in a semiarid grassland on the Loess Plateau".EUROPEAN JOURNAL OF SOIL SCIENCE 70.5(2019):1025-1036. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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