紫花苜蓿根际效应对河套灌区土壤盐分和养分的影响

【目的】从时间和空间尺度上分析紫花苜蓿(MedicagosativaL.)不同生长期内根际土壤盐分和养分的动态变化规律,揭示紫花苜蓿生长过程中根际效应对内蒙古河套灌区盐碱地土壤盐分和养分的影响作用,为北方大型灌区盐碱化农地土壤的植物改良措施提供科学依据。【方法】以内蒙古河套灌区盐碱化土壤为研究对象,以当地土著耐盐牧草紫花苜蓿为试验植物,通过盆栽根袋模拟装置,采集分析不同生长期内(20、40和60d)紫花苜蓿根际和非根际土壤的pH、盐分和养分含量,并分析其变化规律。【结果】随着紫花苜蓿的生长,其根际土壤的电导率、pH、Na+、K+、Mg2+、Cl-和CO32-含量逐渐降低;根际和非根际土壤中Na...

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Published in南方农业学报 Vol. 49; no. 2; pp. 246 - 252
Main Author 刘菊梅;曹博;石春芳;辛翠花;毕捷;张庆辉;兰宗宝;司万童
Format Journal Article
LanguageChinese
Published 内蒙古科技大学 生命科学与技术学院,包头,014010%包头师范学院 资源与环境学院,包头,014030%广西农业科学院 农业科技信息研究所,南宁,530007 2018
Subjects
紫花苜蓿;根际效应;土壤盐碱化;盐分;养分;植物改良
rhizosphere effect
养分
alfalfa(Medicago sativa L.)
salt
nutrient
土壤盐碱化
盐分
plant improvement
紫花苜蓿
根际效应
植物改良
soil alkalization
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ISSN2095-1191
DOI10.3969/j.issn.2095-1191.2018.02.07

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Summary:【目的】从时间和空间尺度上分析紫花苜蓿(MedicagosativaL.)不同生长期内根际土壤盐分和养分的动态变化规律,揭示紫花苜蓿生长过程中根际效应对内蒙古河套灌区盐碱地土壤盐分和养分的影响作用,为北方大型灌区盐碱化农地土壤的植物改良措施提供科学依据。【方法】以内蒙古河套灌区盐碱化土壤为研究对象,以当地土著耐盐牧草紫花苜蓿为试验植物,通过盆栽根袋模拟装置,采集分析不同生长期内(20、40和60d)紫花苜蓿根际和非根际土壤的pH、盐分和养分含量,并分析其变化规律。【结果】随着紫花苜蓿的生长,其根际土壤的电导率、pH、Na+、K+、Mg2+、Cl-和CO32-含量逐渐降低;根际和非根际土壤中Na+/K+和Cl-/SO42-均呈逐渐降低趋势,根际土壤中Cl-/SO42-相对于非根际土壤降低程度较明显。非根际土壤中总氮、总磷和有机质含量总体上呈下降趋势,根际土壤中总氮含量相对稳定,总磷含量降低,速效磷含量显著升高(P<0.05)。【结论】紫花苜蓿根际效应可降低河套灌区盐碱化土壤的pH、电导率和主要盐分离子浓度,提高磷的有效性,有助于盐碱地土壤理化性质的改善及有效肥力的增强,且其影响作用随紫花苜蓿生长时间的延长逐渐加强。
Bibliography:Objective】In perspectives of time and space,the dynamic variation of soil salt and nutrient in rhizosphere soil of alfalfa(Medicago sativa L.)during different growth periods.The rhizosphere effects of alfalfa on salt and nutrientin saline-alkali soil of Hetao irrigation area,Inner Mongolia was studied.With these efforts,this paper aimed to provide scientific basis for plant improvement in saline-alkali soil in large irrigation area of northern China.【Method】In this study,saline-alkali soil from Hetao irrigation area in Inner Mongolia was used as the research target,and alfalfa,an indigenous salt-tolerant forage,was selected as the experimental plant.Through lab potted plant device,pH,salt content and nutrient content in rhizosphere soil and non-rhizosphere soil of alfalfa during different growth stages(20,40and60d)were sampled and analyzed,and their variation regulations were studied.【Result】With the growth of alfalfa,electric conductivity(EC),pH,Na+,K+,Mg2+,Cl-and CO32-contents decreased gradually in the rhi
ISSN:2095-1191
DOI:10.3969/j.issn.2095-1191.2018.02.07