山东省主要土类的无机磷及其与磷酸化酶和解磷微生物的关系

山东省3大土类中潮土的无机磷含量极显著高于棕壤和褐土。3大土类不同形态无机磷中,以Ca-P为主,平均占无机磷总量的65.7%,3大土类间Ca10-P、Fe-P差异极显著,Ca8-P差异显著;褐土和潮土高产农田的Ca2-P、棕壤的Fe-P均显著高于中低产田。6种不同形态的无机磷中棕壤以Al-P、潮土和褐土以Ca2-P的有效性最高,是反映土壤磷素有效性的主要指标之一,与土壤肥力密切相关。通过3大土类2个产量水平土壤的无机磷与解磷微生物的数量、强度和各种酶的活性的相关性分析,探讨了土壤无机磷通过土壤微生物和磷酸化酶的生物活性进行转化的机制,为3大土类和2个产量水平的土壤培肥提供了科学依据。

Inorganic Phosphorus and Its Correlation with Soil Phosphatase and Phosphorus-solubilizing Microbes in the Main Soils of Shandong Province

The amount of inorganic P in cultivated meadow soil was higher that that in cinnamon and brown soil.Ca-P was the main form of the different inorganic P.Among the 3 main soil types,Ca10-P,Fe-P and Ca8-P were significantly different.In high yield fields,Ca2-P of cinnamon soil,Fe of brown soil and O-P of cultivated meadow soil were significantly higher than in low yield fields.The activity of Al-P in brown soil,Ca2-P in cultivated meadow soil and cinnamon soil was the highest among the 6 types and that can be used for an indication of soil fertility.The mechanism of transformation of inorganic P to available P was dependent on phosphorus-solubizing microbes and phosphatase activity.