Responses of soil carbon and nitrogen to successive land use conversion in seasonally frozen zones

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• 作者：Xiao Pu ; Hongguang Cheng ; Mats Tysklind ; Shengtian Yang ; Chunye Lin…
• 关键词：Soil carbon and nitrogen ; Sequestration potential ; Land use conversion ; Vegetation succession ; Seasonally frozen soils
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：387
• 期：1-2
• 页码：117-130
• 全文大小：1,228 KB
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  2. Bhattacharyya R, Kundu S, Srivastva AK, Gupta HS, Prakash V, Bhatt JC (2010) Long term fertilization effects on soil organic carbon pools in a sandy loam soil of the Indian sub-Himalayas. Plant Soil 341(1-):109-24. doi:10.1007/s11104-010-0627-4
  3. Cheng X, Yang Y, Li M, Dou X, Zhang Q (2012) The impact of agricultural land use changes on soil organic carbon dynamics in the Danjiangkou Reservoir area of China. Plant Soil 366(1-):415-24. doi:10.1007/s11104-012-1446-6
  4. Churchland C, Mayo-Bruinsma L, Ronson A, Grogan P (2010) Soil microbial and plant community responses to single large carbon and nitrogen additions in low arctic tundra. Plant Soil 334(1-):409-21. doi:10.1007/s11104-010-0392-4 CrossRef
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• 作者单位：Xiao Pu (1) (2) (3)
  Hongguang Cheng (4)
  Mats Tysklind (3)
  Shengtian Yang (2)
  Chunye Lin (4)
  Lu Lu (4)
  Jing Xie (4)
  
  1. College of Resource, Environment and Tourism, Capital Normal University, Beijing, 100048, China
  2. State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing, 100875, China
  3. Department of Chemistry, Ume? University, Ume?, 90187, Sweden
  4. School of Environment, Beijing Normal University, Beijing, 100875, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

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 10?cm 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 -10?cm 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 -40?cm depth for dryland and 20 -60?cm depth for paddy with increases by 38?Mg C ha? and 2.8?Mg?N?ha? for forest to dryland, and by 56?Mg C ha? and 4.1?Mg?N?ha? 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.