摘要
研究了玛曲高寒沙化草地3种灌木山生柳(Salix oritrepha)、紫穗槐(Amorpha fruticosa)和沙棘(Hippo-phae rhamnoides)根际与非根际土壤各种磷组分。结果表明,除沙棘外,其余2种灌木根际Olsen-P(有效磷包括H2O-P和NaHCO3-Pi)含量高于非根际土壤;3种灌木的根际全磷含量均大于非根际全磷含量。除沙棘以外,其余2种灌木H2O-P(水溶性磷)含量根际均高于非根际。3种灌木NaOH-Pi(0.1mol.L-1 NaOH提取无机磷)和NaOH-Po(0.1mol.L-1 NaOH提取有机磷)根际含量均高于非根际含量。DHCl-Pi(1mol.L-1 HCl提取无机磷)含量除沙棘外其余2种灌木根际均大于非根际。HHCl-Pi(浓HCl提取无机磷)除紫穗槐外根际含量均小于非根际,HHCl-Po(浓HCl提取有机磷)含量除山生柳外,其余表现为根际大于非根际。对根际、非根际土壤全磷、有效磷含量和pH值进行相关性分析,根际、非根际土壤有效磷和全磷含量相关性不显著,除沙棘外,根际和非根际土壤有效磷和pH值呈负相关关系。
Three native shrubs inhabiting in Maqu county, including Salix oritrepha, Amorpha fruticosa and Hippophae rhamnoides, were used as materials to investigate the differences of total P content, available P content and P fractions between rhizosphere and non-rhizosphere soils. It was found that there was a higher available P concentration in the rhizosphere soil comparing to that in the non-rhizosphere soils of A. fruticosa and S. oritrepha. The total P content in the rhizosphere soil was higher than that in the non rhizosphere soil of the three shrubs. The concentrations of total P and H20-P were lower in the non rhizo- sphere soil than that in the rhizosphere soil except H. rhamnoides. The contents of NaOH-Pi and NaOH- Po were higher in the rhizosphere soil than that in the non-rhizosphere soil of the three shrubs. The con- centration of HHCl Pi in the rhizosphere soil was lower than that in the non-rhizosphere soil except A. fruticosa. The concentration of HHCl-Po in the rhizosphere soil was higher than that in non-rhizosphere soil except S. oritrepha. Regression analysis indicated that there was a negative significant relationship be- tween available P concentration and pH in both soils of S. oritrepha and A. fruticosa, but no relationship was found between total P and available P concent in both of the rhizosphere and non-rhizosphere soils.
出处
《草业科学》
CAS
CSCD
北大核心
2012年第2期167-173,共7页
Pratacultural Science
基金
国家科技支撑计划资助项目(2007BAD80B05)
国家自然科学基金资助项目(30800801)
关键词
玛曲
高寒草地
灌木
根际土壤
有效磷
Maqu
alpine meadow
shrubs
rhizosphere soil
available phosphorus
