| Title | Iron-mediated soil carbon response to water-table decline in an alpine wetland |
| Authors | Wang, Yiyun Wang, Hao He, Jin-Sheng Feng, Xiaojuan |
| Affiliation | Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China. Univ Chinese Acad Sci, Beijing 100049, Peoples R China. Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China. Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China. Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China. Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China. Feng, XJ (reprint author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China. |
| Keywords | PHENOL OXIDASE ACTIVITY DISSOLVED ORGANIC-MATTER EXTRACELLULAR ENZYME-ACTIVITY TROPICAL FOREST SOILS SORPTIVE STABILIZATION NITROGEN DEPOSITION OXIDATION-PRODUCTS SUMMER DROUGHT PLANT-TISSUES DECOMPOSITION |
| Issue Date | 2017 |
| Publisher | NATURE COMMUNICATIONS |
| Citation | NATURE COMMUNICATIONS.2017,8. |
| Abstract | The tremendous reservoir of soil organic carbon (SOC) in wetlands is being threatened by water-table decline (WTD) globally. However, the SOC response to WTD remains highly uncertain. Here we examine the under-investigated role of iron (Fe) in mediating soil enzyme activity and lignin stabilization in a mesocosm WTD experiment in an alpine wetland. In contrast to the classic 'enzyme latch' theory, phenol oxidative activity is mainly controlled by ferrous iron [Fe(II)] and declines with WTD, leading to an accumulation of dissolvable aromatics and a reduced activity of hydrolytic enzyme. Furthermore, using dithionite to remove Fe oxides, we observe a significant increase of Fe-protected lignin phenols in the air-exposed soils. Fe oxidation hence acts as an 'iron gate' against the 'enzyme latch' in regulating wetland SOC dynamics under oxygen exposure. This newly recognized mechanism may be key to predicting wetland soil carbon storage with intensified WTD in a changing climate. |
| URI | http://hdl.handle.net/20.500.11897/472688 |
| ISSN | 2041-1723 |
| DOI | 10.1038/ncomms15972 |
| Indexed | SCI(E) |
| Appears in Collections: | 城市与环境学院 地表过程分析与模拟教育部重点实验室 |
