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选择在陕西省榆林市靖边县毛乌素沙漠南缘已生长60、35、28和6年的紫穗槐(Amorpha fruticosa)样地,对不同株龄紫穗槐根际和非根际土壤的全氮、铵态氮、硝态氮、有机碳的含量特征及土壤pH值的变化进行了分析。结果表明,根际全氮、铵态氮(除28年龄外)、硝态氮、有机碳含量均高于非根际,其中有机碳含量差异达到显著水平(P<0.05)。35年龄紫穗槐根际的全氮、铵态氮、硝态氮含量均高于其它株龄,分别比非根际高43.8%、30.3%和230%。有机碳含量根际与非根际都随着株龄增长而增加,而根际与非根际pH值随着株龄的增长而呈下降趋势。相关性分析表明,根际全氮与有机碳、铵态氮、硝态氮均呈显著相关,而在非根际没有相关性。根际土壤养分均高于非根际土壤,种植紫穗槐可以有效地改良土壤。
The Amorpha fruticosa samples that had been grown for 60, 35, 28 and 6 years in the southern margin of Mu Us desert in Jingbian County, Yulin City, Shaanxi Province were selected to study the effects of Amorpha fruticosa on rhizosphere and non-rhizosphere soils The contents of nitrogen, ammonium nitrogen, nitrate nitrogen, organic carbon and soil pH value were analyzed. The results showed that the content of total nitrogen and ammonium nitrogen in rhizosphere (except 28 years old), nitrate nitrogen and organic carbon were all higher than those in non - rhizosphere soil, and the content of organic carbon reached a significant level (P <0.05). The contents of total nitrogen, ammonium nitrogen and nitrate nitrogen in 35-year-old Amorpha fruticosa were higher than those in other plant age, which were 43.8%, 30.3% and 230% higher than those in non-rhizosphere respectively. Both rhizosphere and non-rhizosphere soil organic carbon content increased with plant age, while rhizosphere and non-rhizosphere pH values tended to decrease with the increase of plant age. Correlation analysis showed that total rhizosphere nitrogen and organic carbon, ammonium nitrogen, nitrate nitrogen were significantly related, but not in the non-rhizosphere. Rhizosphere soil nutrients were higher than non-rhizosphere soil, planting Amorpha fruticosa can effectively improve the soil.