Soil phosphorus forms and availability in natural regeneration by man-aidedCastanopsis carlesiiforests
By appling a modiifed Hedley phosphorus (P) fractionation method, the soil phosphorus availability and forms in surface soil (0~10 cm) ofCastanopsis carlesii stands at different tree-ages (21, 31, 49-year-old) in Shunchang county, Fujian province were investigated. The results show that the concentrations of inorganic P in 21, 31, 49-year-old stands were 237.53, 238.75 and 251.89 mg/kg, respectively; Of all forms of inorganic phosphorus, the maximum concentration values of resin-P and NaoH-Pi both appeared in the 49-year-old forest’s soil, but other forms of inorganic P did not depend on the stages of forest development; the concentrations of NaCHO3-Po, NaOH-Po and total organic P increased with the stages of forest development; the concentrations of available phosphorus increased with the stages of stand development and had signiifcant positive correlation with resin-P, NaCHO3-Po and NaOH-Po. The results implied that resin-P may serve as a predictive indicator of red soil P deifciency. The mineralisation of organic P in the soil had a signiifcant impact on soil P availability.
NETL
NSTL
万方数据
维普
