文献类型：期刊文献

英文题名：Shifts of active microbial community structure and functions in constructed wetlands responded to continuous decreasing temperature in winter

作者：Wang, Shaokun[1,2] Wang, Rumiao[1,2] Vyzmal, Jan[3] Hu, Yukun[1,2] Li, Wei[1,2] Wang, Jinzhi[1,2] Lei, Yinru[1,2] Zhai, Xiajie[1,2] Zhao, Xinsheng[1,2] Li, Jing[1,2] Cui, Lijuan[1,2]

第一作者：Wang, Shaokun

机构：[1] Institute of Wetland Research, Chinese Academy of Forestry, Beijing Key Laboratory of Wetland Ecological Function and Restoration, Beijing, 100091, China; [2] Beijing Hanshiqiao National Wetland Ecosystem Research Station, Beijing, 101399, China; [3] Czech University of Life Sciences Prague, Faculty of Environmental Sciences, Kamycká 129, 165 21 Praha 6, Czech Republic

年份：2023

卷号：335

外文期刊名：Chemosphere

收录：EI(收录号：20232414209803);Scopus(收录号：2-s2.0-85161337379)

语种：英文

外文关键词：Bacteria - Biodegradation - Enzyme activity - Phosphatases - Soil temperature - Soils

摘要：Important functions of constructed wetland related to biogeochemical processes are mediated by soil microbes and low-temperature damage is the main limiting factor for microbes in winter. However, the response thresholds for active microbial community and enzyme activities to continuous decreases in temperature remain unclear. In this study, total 90 soil samples were collected every week over a 6-week period to track the dynamics of four enzymes involved in cycles of C, N, P and active bacterial community as field soil temperature decreased continuously from 6.62 °C to 0.55 °C. Enzyme activity changed suddenly when the temperature decreased to 4.83 °C, the nitrite reductase activity reduced by 36.2%, while alkaline phosphatase activity is increased by 396%. The cellulase and urease were only marginally influenced by cold stress. Decreased nitrite reductase activities corresponded with loss of nir-type denitrifiers important for nitrite reduction. For cold stress, N-related bacteria were sensitive species. Whereas increased alkaline phosphatase activity may be due to the fact that P-related bacteria were opportunistic species. Key functional taxa connected with degradation of cellulose promoted species coexistence and microbial network stability. The lower and upper temperature thresholds for community change were 4.85 °C and 6.30 °C, respectively. Collectively, these results revealed that microbial taxa involved in C, N and P cycling respond differently to continuous decreases in temperature and higher than 4.85 °C is an ideal environment to prevent loss of microbial diversity and functions in winter, providing a scientific reference for the targeted isolation and cultivation of key microbial taxa in rhizosphere soil and adjusting temperature range to improve the purification capacity of wetlands during low temperature periods. ? 2023 Elsevier Ltd