不同种植年限黑土型蔬菜保护地磷素状况的研究

采用石灰性土壤无机磷形态分级方法,对不同种植年限的蔬菜保护地0～60cm土层土壤磷素形态及其含量特征与差异进行了研究.结果表明:哈尔滨市蔬菜保护地土壤磷素处于大量积累状态,其中全磷、速效磷、有机磷、Ca2-P、Ca8-P、Al-P、Fe-P、O-P、Ca10-P在0~20era土层积累较多,且随土层深度的增加各形态磷的...

PHOSPHORUS STATUS OF BLACK SOIL IN VEGETABLE SOIL AFTER DIFFERENT PLANTING DURATION

Jiang-Gu inorganic phosphorus fractionation method was used to study the phosphorus status, characteristics and contents in 0~60cm vegetable soil of different planting duration and different soil layers. Results showed that phosphorus was massively accumulated in Harbin vegetables soil. The total phosphorus, available phosphorus, organic phosphorus, Ca2-P, Ca8-P, Al-P, Fe-P, O-P, Ca10-P were accumulated in 0~20cm soil layer, but phosphorus content of various form reduced gradually along with the increasing of soil layer depth; At all soil layers, changes in all forms of phosphorus showed periodical variation in the growing season, and the trends of phosphorus always showed a decreasing then followed by an increasing in phosphorus content due to type and rate of fertilizer and crop rotation. Accumulated inorganic phosphorus in vegetables soil was in the order: Ca-P (Ca8-P> Ca2-P> Ca10-P) > Al-P> Fe-P > O-P. This research suggested that excessive accumulation of phosphorus resulted from the long-term excessive phosphorus fertilization in vegetable soil, and balance fertilization should be advocated to control soil phosphorus accumulation during the vegetables production.