覆膜旱作稻田土壤有效N、P、K及盐分分层变化研究

以常规水作和裸地旱作作对照,对覆膜旱作栽培条件下稻田各土层(0～60cm)土壤有效N、P、K和盐分含量变化作了比较研究。结果表明:与常规水作相比,覆膜旱作稻田10～15cm土层的碱解氮与有效磷含量显著增加,其余差异不大。与裸地旱作相比,覆膜旱作稻田5～15cm土层的碱解氮含量及5～20cm土层的有效磷含量显著增加,其余差异不大。与常规水作和裸地旱作相比,覆膜旱作稻田土壤速效钾含量在20cm以上土层增加明显。当地下水位较高时,覆膜旱作稻田0～5cm表层土壤表现积盐,地下水位较低时表层表现脱盐。

Study on Changes of Available N,P and K and Salt of Different Layers of Paddy Soils under Plastic Film Mulching Cultivation

The changes of available N,P,K and the salt in 0-60 cm layers of paddy soils under plastic film mulching cultivation were studied in this paper. The results were as follows. Compared with traditional flooded cultivation, film mulching cultivation could increase available N,P in 10-15 cm layers of soils. Compared with uncovered cultivation, it increased soil available N and P in the soil layers of 5-15cm and 5-20cm respectively. Compared with traditional flooded cultivation and uncovered cultivation, it obviously increased available K in 0-20 cm layers of soils. When underground water level was higher, mulching plastic film resulted in accumulation salt in the surface layer(0-5cm)of soils, but when underground water level was lower, it caused to take off the salt in the surface layer of soils.