Study on the Difference of Chemical Properties among Five Acacia Woods Ⅱ. Study on pH Values and Buffering Capacities Mechanism on phosphate solubilization of pseudomonas sp. K3 and its phosphate solubilization ability under buffering condition Study on the Phosphate Buffering Capacity and Fertiphos Requirement of Red Soils under Chinese Fir Stand Intraspecific Variations of Phosphorus Absorption and Remobilization, P Forms, and Their Internal Buffering in Brassica Cultivars Exposed to a P-Stressed Environment Comparison of the Resistance of Three Woody Plant Species to Air Pollution in Guangdong Province