Soil phosphorus pools and availability on Pinus sylvestris var.mongolica plantation

Abstract

Abstract: Concentrations and availability of different forms of soil phosphorus (P) in soil profile in Pinus sylvestris var.mongolica plantation were tested.Meanwhile,correlations between different forms of soil Pwere analyzed.The results indicated that concentrations of soil total P (0.05～0.18 mg·g^-1) and olsen-P (1.50～2.24 mg·kg^-1in surface soil) were very low,organic P accounted for 40%～80% of total P,and within inorganic P,Ca-P>Fe-P>Al-P.Concentrations of a total P,organic P and fractionas of inorganic P in the 0～5 cm horizon were significantly higher than those in deeper soil horizons.Additionally,phosphate leaching occured along soil profile.Olsen-Pwas significantly correlated with organic P,Fe-P,and Al-P. In conclusion,factors controlling soil Pavailability in our study sites were complex.Most probably,the transformation of different forms of inorganic P,especially Fe-Pand Al-P,was the main factor influencing the availability of soil P at the short time scale,while organic P was the most important potential of available P.

Key words: Bactrocera dorsalis, Population dynamics, Xishuangbanna

CLC Number:

S158.3

ZHAO Qiong, ZENG Dehui, CHEN Fusheng, CHEN Guangsheng, YU Zhanyuan, JI Xiaoyan. Soil phosphorus pools and availability on Pinus sylvestris var.mongolica plantation[J]. cje, 2004, (5): 224-227.

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