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-lian; XING Xiao-yi; CHENG Man; XUE Zhi-jing; AN Shao-shan
April 2013
Yingyong Shengtai Xuebao;Apr2013, Vol. 24 Issue 4, p983
Academic Journal
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.


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