甘肃省主要农业土壤无机磷形态的研究

用蒋柏藩等(1990)新提出的石灰性土壤无机磷的分级方法,对甘肃省主要农业土壤的无机磷形态分布进行了研究。结果表明,供试的4种土壤的无机磷均以Ca-P为主,平均占全磷的56.2％,其中又以Ca_(10)-P为最高,平均占全磷的45.6％。褐土与灌漠土、黄绵土和黑垆土三类土壤相比,Fe-P增高,而Ca-P相应降低。故灌漠土、黄绵土和黑垆土的各级无机磷含量分布顺序为:Ca_(10)-P>Ca_8-P>O-P>Al-P>Fe-P>Ca_2-P;而褐土的分布顺序则为:Ca_(10)-P>0-P>Fe-P>Ca_8-P>Al-P>Ca_2-P。

The Phosphorus Forms of Principal Agricultural Soil in Gansu Province

The inorganic-P form of principal agricultural soils in Gansu province were studied with the classification schemes of inorganic-P in calcareous soil, which was put forward by Jiang Baifan et al (1990). Results showed that Ca-P was the main phosphorus form in inorganic-P of the four types of soil investigated (56.2% in total phosphorus), and the contents of Ca_(10)-P was the highest in the Ca-P (45.6% in total P).The Fe-P was higher and the Ca-P was lower in cinnamon soil than irrigated desert soil, Huangmian soil and Heilu soil. Therefore, the rank of component contents of inorganic-P was Ca_(10)-P>Ca_8-P>O-P>Al-P>Fe-P>Ca_2-P in irrigated desert soil, Huangmian soil and Heilu soil, however, it was Ca_(10)-P>O-P >Fe-P>Ca_8-P>Al-P>Ca_2-P in cinnamon soil.