茶树根际与非根际土壤磷形态变化特征

以茶树(Camellia sinensis)根际和非根际土壤为研究对象,选取湖南省石门、临澧、桃源、长沙、安化、资兴等6县(市)的茶园为采样点,对其根际和非根际土壤的全磷、有效磷及无机磷的不同化学形态进行了分析。结果表明,茶树根际土壤全磷和有效磷含量均高于非根际土壤,有效磷在根际富集明显;土壤无机磷含量及占全磷的比例差异都很大。不同母质发育土壤的无机磷组成也不同,板页岩母质发育的根际土壤中Al-P含量最高,Fe-P其次,O-P最少。花岗岩和第四纪红色黏土发育的根际土壤Fe-P最高,Al-P其次,O-P最少。3种母质发育的非根际土壤中均为Fe-P含量最高。根际无机磷中的Al-P,Fe-P和Ca-P含量与有效磷呈极显著正相关,非根际Al-P和Fe-P与土壤有效磷显著正相关关系。根际、非根际土壤全磷和有效磷含量与pH值相关性不显著,根际、非根际土壤有效磷和全磷含量相关性极显著。

Characteristics of Phosphorus Forms in Rhizosphere and Non-rhizosphere Soil of Tea Plantation

The characteristics of soil total phosphorus(P),available P,different chemical form of inorganic P were studied in rhizosphere and non-rhizoshpere soil that was collected from Shimen,Linli,Taoyuan and Changsha area in tea plantation.The results showed the content of total P and available P were higher in rhizosphere soil than non-rhizosphere soil,and the apperent enrichment of available P was observed,while the difference was greater in the content of inorganic P,the ratio of available P to total P in tea plantation soil.In the rhizosphere soils derived from plate shale,the content of Al-P was the highest,Fe-P second and O-P was the least;in rhizosphere soils derived from granite and quaternary red clay,the content of Fe-P was the highest,Al-P second and O-P was the least.In all three types of non-rhizosphere soil the content of Fe-P was the highest.The correlation between Al-P,Fe-P,Ca-P of inorganic P in rhizosphere soil and the available P was extremely positive significant,but between Al-P,Fe-P in non-rhizosphere soil and the available P was positive significant.The P and the available P got no significant correlation with pH value in both rhizosphere and non-rhizosphere soils while the available P had significant correlation with the total P.