Relationships between foliar phosphorus fractions of Pinus sylvestris var. mongolica and soil available phosphorus

Abstract

In order to find out the best foliar diagnostic index of phosphorus (P) nutrition in Mongolian pine (Pinus sylvestris var. mongolica) in the southeastern Keerqin Sandy Lands, the concentrations of total nitrogen (N), inorganic P, organic P and total P in needles of different ages and soil available P were examined. The results show that in the study area, soil available P was rather low (0.12-0.63 mg/kg) and was significantly correlated with inorganic P (cPi) and total P (cPt) concentrations in current year needles of Mongolian pine. The significant correlation between soil available P and needle cPt derived from the significant correlation between cPi and cPt. Compared with cPt, cPi did reflect the level of soil P supply more accurately and more directly.

Keywords

foliar P fractions / soil P supply / Pinus sylvestris var. mongolica

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Acknowledgements

This work was supported by grants from the National Science & Technology Supporting Program of China (No. 2006BAD26B0201-1) the National Key Basic Research Program of China (No. 2007CB106803) and the National Natural Science Foundation of China (30800887). The authors also thank Guiyan AI and Heming LIN for their help in the laboratory analysis and Dongzhou DENG and Hong WANG for their assistance in sampling.

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