caa a22 4500 606218599 CHVBK 20210128101113.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s11104-014-2284-5 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2284-5 Responses of soil carbon and nitrogen to successive land use conversion in seasonally frozen zones [Elektronische Daten] [Xiao Pu, Hongguang Cheng, Mats Tysklind, Shengtian Yang, Chunye Lin, Lu Lu, Jing Xie] Background and aims: Policy-oriented successive land use conversion intensively occurred in seasonally frozen zones of China during the past five decades. However, responses of soil carbon (C) and nitrogen (N) to land use conversion under cold temperate climates are not fully understood. The objective was to characterize C and N variations following a succession of forest, dryland and paddy. Methods: Soil cores were collected for 6 layers with a 10cm increment from three adjacent chronosequences to determine concentrations of soil organic carbon (SOC), total nitrogen (TN), dissolved organic carbon (DOC) and alkaline hydrolysable nitrogen (HN). Analysis of variance with multivariate general linear model was operated on data sets. Results: Significant losses of SOC and TN storages subject to land use conversion were merely confined within 0 - 10cm layer, decreasing by 16% and 38% for forest to dryland and by 23% and 43% for forest to paddy, respectively. Cultivation also influenced SOC and TN stocks at 20 - 40cm depth for dryland and 20 - 60cm depth for paddy with increases by 38Mg C ha−1 and 2.8MgNha−1 for forest to dryland, and by 56Mg C ha−1 and 4.1MgNha−1 for forest to paddy, respectively. Conclusion: Successive land use conversion from forest to cropland affected C and N levels in deeper layers, demonstrating the high potentials of subsoil in sequestrating C and N. The extents of cultivation-induced SOC and TN redistribution along soil profile varied among different agricultural systems. DOC and HN changes interpreted SOC and TN changes with land use, presenting high involvements of soluble compartments in SOC and TN variations. The net variation in SOC/TN ratio effectively indicated C and N changes when dryland was converted to paddy. Springer International Publishing Switzerland, 2014 Soil carbon and nitrogen nationallicence Sequestration potential nationallicence Land use conversion nationallicence Vegetation succession nationallicence Seasonally frozen soils nationallicence Pu Xiao College of Resource, Environment and Tourism, Capital Normal University, 100048, Beijing, China aut Cheng Hongguang School of Environment, Beijing Normal University, 100875, Beijing, China aut Tysklind Mats Department of Chemistry, Umeå University, 90187, Umeå, Sweden aut Yang Shengtian State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, 100875, Beijing, China aut Lin Chunye School of Environment, Beijing Normal University, 100875, Beijing, China aut Lu Lu School of Environment, Beijing Normal University, 100875, Beijing, China aut Xie Jing School of Environment, Beijing Normal University, 100875, Beijing, China aut Plant and Soil Springer International Publishing 387/1-2(2015-02-01), 117-130 0032-079X 387:1-2<117 2015 387 11104 https://doi.org/10.1007/s11104-014-2284-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2284-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pu Xiao College of Resource, Environment and Tourism, Capital Normal University, 100048, Beijing, China aut NATIONALLICENCE 700 1- Cheng Hongguang School of Environment, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 700 1- Tysklind Mats Department of Chemistry, Umeå University, 90187, Umeå, Sweden aut NATIONALLICENCE 700 1- Yang Shengtian State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 700 1- Lin Chunye School of Environment, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 700 1- Lu Lu School of Environment, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 700 1- Xie Jing School of Environment, Beijing Normal University, 100875, Beijing, China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 387/1-2(2015-02-01), 117-130 0032-079X 387:1-2<117 2015 387 11104