title: [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].
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.
authors.affiliation: College of Resource and Environmental Science, Northwest A&F University, Yangling 712100, Shanxi, China. zhuqlby@163.com
authors.forename: Qiu-lian
authors.initials: QL
authors.lastname: Zhu
authors.forename: Xiao-yi
authors.initials: XY
authors.lastname: Xing
authors.forename: Man
authors.initials: M
authors.lastname: Cheng
authors.forename: Zhi-jing
authors.initials: ZJ
authors.lastname: Xue
authors.forename: Shao-shan
authors.initials: SS
authors.lastname: An
mesh_terms: D031702:Agropyron / Q000378:metabolism; D000531:Altitude; D019306:Artemisia / Q000378:metabolism; D002244:Carbon / Q000737:chemistry*; D002681:China; D017753:Ecosystem; D009584:Nitrogen / Q000737:chemistry*; D018517:Plant Roots / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D058441:Rhizosphere; D046930:Thymus Plant / Q000378:metabolism
chemical_list: D002244:Carbon; D009584:Nitrogen