摘要
以西北地区有代表性的灌淤土为供试土壤,研究不同类型菜田(露地菜田和蔬菜保护地)及农田土壤的P素状况,以及蔬菜保护地土壤P素的空间分布特性.结果表明,露地菜田、蔬菜保护地土壤全P、无机P、有机P、Olsen-P的平均含量是一般农田土壤的1.43～8.30倍,土壤Olsen-P占全P的比率显著高于一般农田.蔬菜保护地土壤各形态P素主要积累在0～30 cm土层,并随土层深度的增加各形态P素的含量逐渐降低,各土层Olsen-P、Ca2-p、Ca8-P、Al-P含量降低幅度明显高于Fe-P、O-P、Ca10-P.
Fractions of phosphorus in vegetable soils and farmland soils in Northwest China were explored. The results showed that the contents of total P and organic P in vegetable soils was 1.83 ～ 8.3 times as much as in farmland soils. The percentage of Olsen-P to total P and the percentage of Ca2-P, Cas-P, Al-P and Fe-P to inorganic P were higher in vegetable soils than in farmland soil. In protected vegetable soils, P of various fractions accumulated mainly in the 0 ～ 30 cm soil layer and decreased with depth in soil profile. The decrease was more significant with the content of Olsen-P, Ca2-P, Ca8-P and Al-P than with Fe-P, O-P and Ca10-P.
出处
《土壤》
CAS
CSCD
北大核心
2005年第6期649-654,共6页
Soils
关键词
菜田
农田
土壤磷素
空间分布特性
Vegetable soil, Farmland, Fraction of phosphorus, Spatial distribution of P
