宁南山区典型植物根际与非根际土壤碳、氮形态  

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

作　　者：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] 

机构地区：[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　　处：《应用生态学报》2013年第4期983-988,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41171226;40971171);西北农林科技大学优秀青年人才科研专项(QN2011049)资助

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20.88g·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2.05g·kg-1、23.73mg·kg-1和11.99mg·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.Taking the rhizosphere and non-rhizosphere soils of five typical plants Agropyron crista- turn, 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 con- tents. 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.

关 键 词：宁南山区 典型植物 根际土壤 土壤碳素 土壤氮素 

分 类 号：S153[农业科学—土壤学]