Effects of land-use change on soil organic carbon and nitrogen in density fractions and soil δ13C and δ15N in semiarid grasslands

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• 作者：Liping Qiu ; Xiaorong Wei ; Tiane Ma ; Yanchun Wei ; Robert Horton…
• 关键词：Cropland ; Isotopic signatures ; Light and heavy fractions ; Shrubland ; Soil nitrogen ; Soil organic carbon
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：390
• 期：1-2
• 页码：419-430
• 全文大小：401 KB
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• 作者单位：Liping Qiu (1)
  Xiaorong Wei (1)
  Tiane Ma (1)
  Yanchun Wei (1)
  Robert Horton (2)
  Xingchang Zhang (1)
  Jimin Cheng (1)
  
  1. State Key Laboratory of Soil Erosion and Dryland Farming in the Loess Plateau, Northwest A&F University, Xinong Road, #26, Yangling, Shaanxi Province, 712100, China
  2. Department of Agronomy, Iowa State University, Ames, 50011, USA
  
• 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

Aims The objectives of this study were to determine the response of soil organic carbon (SOC) and nitrogen (N) in different density fractions and the response of δ13C and δ15N signatures of soil to land-use change in a semiarid grassland. Methods We measured soil δ13C and δ15N and the concentrations of SOC and N in whole soil and in the light and heavy fractions in adjacent tracts of native grassland, cropland, and shrubland in a semiarid region of China. The cropland and shrubland were established on existing grassland 27?years ago. Results The conversion of grassland to cropland or to shrubland significantly decreased SOC and N concentrations and stocks in both whole soil and density fractions in the 0-0?cm soil layer. The decreases in SOC and N stocks associated with the heavy fraction accounted for >90?% of the total decrease in the 0-0?cm soil layer after grassland cultivation or afforestation. The conversion of grassland to cropland or to shrubland significantly enriched soil δ13C but depleted δ15N. Conclusions Our results suggested that the losses of SOC and N in whole soil after land-use changes in this semiarid grassland were primarily due to losses of SOC and N associated with the heavy fraction.