超旱生灌木根际土壤磷的含量特征

The character of phosphorus concentrations in rhizosphere soil of super-xerophytic shrubs

对阿拉善荒漠类草地的5种超旱生灌木根际和非根际土壤全P及有效P含量进行比较,并分析根际与非根际土壤含磷量特征,结果表明,霸王、驼绒藜、沙木蓼和四合木4种灌木根际土壤全P、有效P含量高于非根际土壤,而红砂根际土壤虽全P含量高于非根际土壤,但有效P含量却低于非根际土壤。对根际、非根际土壤全P和有效P含量进行相关性分析,非根际土壤有效P和全P含量显著相关,而根际土壤有效P和全P含量相关性不显著。

In this paper we investigated and compared the total phosphorus and available phosphorus concentrations in non-rhizosphere and rhizosphere soils of five super-xerophytic shrubs in the Alashan desert. The results from this study indicated that there were consistently higher total phosphorus and available phosphorus concentrations in the rhizosphere soils than in the non-rhizosphere soils of Zygophyllum xanthoxylum、Ceratoides holmgern、Atraphaxis bracteate、Tetraena Mongolica. Reaumuria soongorica showed a higher total phosphorus concentration in rhizosphere than in non-rhizosphere soils, although was shown to have a lower available phosphorus concentration in the rhizophere compared with the non-rhizosphere soils. Regression analyses indicated that there was a significant correlation between the total phosphorus and available phosphorus concentrations in non-rhizosphere soil. In contrast, rhizosphere soils showed no significant relationship between the total phosphorus and available phosphorus concentrations.