宁南山区典型植物根际与非根际土壤碳、氮形态

应用生态学报

宁南山区典型植物根际与非根际土壤碳、氮形态

朱秋莲^1,2,3,邢肖毅^1,3,程曼^1,3,薛志婧^1,3,安韶山^1,3**

(¹西北农林科技大学资源环境学院, 陕西杨凌 712100； ^2西藏职业技术学院农林系, 拉萨 850030； ³土壤侵蚀与黄土区旱地农业国家重点实验室, 陕西杨凌 712100)

出版日期:2013-04-18 发布日期:2013-04-18

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^1,2,3, XING Xiao-yi^1,3, CHENG Man^1,3, XUE Zhi-jing^1,3, AN Shao-shan^1,3

(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

摘要/Abstract

摘要： 以宁南山区典型植物冰草、冷蒿、长芒草、百里香和铁杆蒿为对象,研究不同植物根际土壤和非根际土壤碳、氮形态的变化.结果表明: 5种植物对根际土壤和非根际土壤碳、氮含量的影响不同.其中,铁杆蒿的根际土壤碳含量最高,总有机碳、轻组有机碳和重组有机碳含量分别为22.94、1.95和20.88 g·kg^-1,长芒草的根际土壤氮含量最高,总氮、可矿化氮和速效氮含量分别为2.05 g·kg^-1、23.73 mg·kg^-1和11.99 mg·kg^-1.冷蒿的根际土壤中活性有机碳/总有机碳、可矿化氮/总氮最高,有利于土壤中碳素和氮素向活性态转变.轻组有机碳、可矿化氮可作为植物生境改变的敏感指标.5种植物根际土壤各形态碳、氮含量总体上高于非根际土壤.

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.

朱秋莲1,2,3,邢肖毅1,3,程曼1,3,薛志婧1,3,安韶山1,3**. 宁南山区典型植物根际与非根际土壤碳、氮形态[J]. 应用生态学报.

ZHU Qiu-lian1,2,3, XING Xiao-yi1,3, CHENG Man1,3, XUE Zhi-jing1,3, AN Shao-shan1,3. 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.[J]. Chinese Journal of Applied Ecology.