毛乌素沙漠南缘紫穗槐根际与非根际氮素含量特征  

Characteristics of nitrogen content between rhizosphere and bulk soil of Amorpha fruticosa with different plant ages in southern rdge of Mu Us Desert

作　　者：周媛媛[1] 杜明新[1] 周向睿[2] 周志宇[1] 卢鑫[1] 陶晓慧[1] 赵萍[1] 李金辉[1] 金茜[1] 

机构地区：[1]草地农业系统国家重点实验室兰州大学草地农业科技学院,甘肃兰州730020 [2]甘肃农业大学草业学院,甘肃兰州730070

出　　处：《草业科学》2013年第4期515-520,共6页Pratacultural Science

基　　金：国家自然科学基金资助项目(31201849);国家科技支撑计划资助项目(2007BAD80B05)

摘　　要：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。Sample spots were chosen from the southern edge of Mu Us Desert which locates in Jingbian county Yulin city,Shaanxi province.60-year-old,35-year-old,28-year-old and 6-year-old Amorpha fruticosa were selected to study the total nitrogen,ammonium nitrogen,nitrate nitrogen,organic carbon and change of pH in rhizosphere and bulk soil.Foundations of planting A.fruticosa in desert areas were established in this study.The results indicated that total nitrogen,ammonium nitrogen（except 28-year-old A.fruticosa）,nitrate nitrogen and organic carbon cantents in rhizosphere soil were all higher than that in bulk soil,and organic carbon content in rhziosphere was significantly higher than that in bulk soil.Total nitrogen,ammonium nitrogen and nitrate nitrogen cantents of 35-year-old A.fruticosa in rhizosphere were 43.8%,30.3% and 230%,respectively,which were higher than that in bulk soil.Both in rhizosphere and bulk soil,organic carbon content increased while pH had an opposite trend with the age increasing.Correlation analysis indicated that total nitrogen in rhizosphere had a significant relationship with organic carbon,ammonium nitrogen and nitrate nitrogen contents,but no relationship was found in bulk soil.In a word,the nutrition of rhizosphere was higher than that in bulk soil,so soil nutrition can be improved effectively by planting A.fruticosa.

关 键 词：紫穗槐 荒漠化 根际 养分含量 

分 类 号：S551.3[农业科学—作物学]