干旱荒漠区旱生灌木根际土壤磷变化特征  

Changing characteristics of phosphorus in the rhizosphere soil of the xeromorphic shrubs in arid deserts

作　　者：薛梓瑜[1] 周志宇[1] 詹媛媛[1] 任伟[1] 

机构地区：[1]兰州大学草地农业科技学院,兰州730020

出　　处：《生态学报》2010年第2期341-349,共9页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划项目资助(973项目)(2007CB108903);国家自然科学基金资助项目(30800801)

摘　　要：以阿拉善干旱荒漠草地的7种旱生灌木白刺(Nitraria tangutorum)、霸王(Zygophyllum xanthoxylum)、红砂(Reaumuriasoongorica)、沙冬青(Ammopiptanthus mongolicus)、沙木蓼(Atraphaxis bractata)、梭梭(Haloxylon ammodendron)和驼绒藜(Ceratoides lateens)根际和非根际土壤为试验对象,对其根际与非根际土壤全磷、有效磷及不同磷的化学形态特征进行了分析研究。结果表明,7种灌木根际土壤有效磷含量高于非根际土壤;沙木蓼根际全磷含量、DHCl-Pi、HHCl-Pi含量高于非根际土壤,其余6种灌木根际全磷含量、DHCl-Pi、HHCl-Pi含量低于非根际土壤。另外,除梭梭外,其他6种灌木根际土壤H2O-P含量均低于非根际土壤;驼绒藜根际NaHCO3-Pi、DHCl-Pi和HHCl-Pi均显著低于非根际土壤。除沙冬青外,其余6种灌木根际NaOH-Po均低于非根际土壤,7种灌木根际HHCl-Po含量均低于非根际土壤。对根际、非根际土壤全磷,有效磷含量和pH进行相关分析,根际、非根际土壤有效磷和全磷含量相关性不显著,而根际、非根际土壤有效磷和pH相关性显著。Seven native xeromorphic shrub species inhabiting in the Alashan desert,including Nitraria tangutorum,Zygophyllum xanthoxylum,Reaumuria soongorica,Ammopiptanthus mongolicus,Atraphaxis bractata,Haloxylon ammodendron and Ceratoides lateens,are used to investigate and compare differences in contents of total P,available P,and P fractions between bulk and rhizosphere soils.It is found that there is a higher available P concentration in the rhizosphere soil than in the bulk soil for all seven shrubs,but concentrations of total P,DHCl-Pi and HHCl-Pi are lower in the rhizosphere soil than in the bulk soil in all shrubs except A.bracteata.Our results also showed that the H2O-P concentration is lower in the rhizosphere soil than in the bulk soil in all shrubs except H.ammodendron,whereas concentrations of NaHCO3-Pi、DHCl-Pi and HHCl-Pi are lower in the rhizosphere soil than in the bulk soil in C.lateens and that the NaOH-Po concentration is lower in the rhizosphere soil than in the bulk soil in all shrubs except A.mongolicus,as well as the HHCl-Po concentration is lower in the rhizosphere soil than in the bulk soil in all shrubs.Regression analyses indicated a significant relationship between available P concentration and pH,but no significant relationships are found between total P concentration and pH in both the rhizosphere and bulk soils.

关 键 词：干旱荒漠 灌木 根际土壤 有效磷 

分 类 号：S158[农业科学—土壤学]