论文部分内容阅读
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.
The changes of carbon and nitrogen forms in rhizosphere soils and non-rhizosphere soils of typical plants in Ningnan were studied, including Artemisia frigida, Artemisia frigida, Tricholoma giganteum, Thyme and Artemisia selengensis.The results showed that: And non-rhizospheric soil carbon and nitrogen contents were different.Among them, rhizosphere soil carbon content was the highest, total organic carbon, light organic carbon and recombinant organic carbon were 22.94, 1.95 and 20.88g · kg-1 , While the content of total nitrogen, mineralizable nitrogen and available nitrogen were 2.05g · kg-1, 23.73mg · kg-1 and 11.99mg · kg-1, respectively, in the rhizosphere soil of A. mangium Soil active organic carbon / total organic carbon and mineralizable nitrogen / total nitrogen were the highest, which was beneficial to the change of soil carbon and nitrogen to active state. Light organic carbon and mineralizable nitrogen could be used as sensitive indicators of plant habitat change The contents of carbon and nitrogen in rhizosphere soil of five species were higher than those in non-rhizosphere soil.