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Concentrations of different carbon and nitrogen fractions in rhizosphere and non-rhizosphere soils of typical plant species in mountainous area of southern Ningxia, Northwest China.

ZHU Qiu-lian1,2,3, XING Xiao-yi1,3, CHENG Man1,3, XUE Zhi-jing1,3, AN Shao-shan1,3   

  1. (1College of Resource and Environmental Science, Northwest A&F University, Yangling 712100, Shanxi, China;2Department of Agriculture and Forestry, Tibet Vocational and Technical College, Lhasa 850030, China; 3State Key Laboratory of Soil Erosion and Dryland Agriculture of Loess Plateau, Yangling 712100, Shanxi,China)
  • Online:2013-04-18 Published:2013-04-18

Abstract: Taking the rhizosphere and non-rhizosphere soils of five typical plants Agropyron cristatum, Artemisia frigida, Pseudoraphis bungeana, Thymus mongolicus, and Artemisia sacrorum in a mountainous area of southern Ningxia as test objects, this paper studied their C and N forms contents. The C and N forms contents in the rhizosphere and nonrhizosphere soils differed with plant species. In the rhizosphere soil of A. sacrorum, the C content was the highest, with the total soil organic C (TOC), light fraction organic C (LFOC), and heavy fraction organic C contents being 22.94, 1.95, and 20.88 g·kg-1, respectively. In the rhizosphere soil of P. bungeana, the N content was the highest, with the total N (TN), mineralizable N (MN), and available N contents being 2.05 g·kg-1, 23.73 mg·kg-1, and 11.99 mg·kg-1, respectively. In the rhizosphere soil of A. frigida, the LFOC/TOC and MN/TN ratios were the highest, which benefited the C and N transformed into more active forms. Light fraction organic C and mineralizable N could be used as the sensitive indicators of plant habitat change. For the five plant species, the contents of different C and N forms in the rhizosphere soil were generally higher than those in the non-rhizosphere soil.