摘要
通过 6年田间定位试验 ,采用顾益初、蒋柏藩提出的石灰性土壤无机磷分级方法研究测定无机磷形态在 0～ 2 0cm(表层 )和 2 0～ 40cm(下层 )土层的分布。结果表明 :不论是否施肥 ,6年试验后无机磷形态分布特点为Ca2 -P ,O -P(闭蓄态磷 )含量表层高于 2 0～ 40cm土层 ;Fe-P相反 ,是下层高于表层。长期施磷表层和 2 0～ 40cm土层各形态无机磷以及土壤全磷均有增加 ,Ca2 -P ,Ca8-P ,Al-P ,O -P ,Ca10 -P和土壤全磷均是表层增加明显 ,对 2 0～ 40cm土层影响小的特点 ;Fe-P相反 ,是 2 0～ 40cm土层增加较 0～ 2 0cm显著 ,表明长期水旱轮作下 。
In a six-year experiment conducted to study the effects of phosphate fertilization on the distribution of different inorganic P forms in the 0-20 cm and 20-40 cm layers of the soil, the method of fractionation of calcareous soil phosphorus forms developed by Gu Yichu and Jiang Baifan was adopted. With or without P fertilizer application, the distribution of inorganic phosphorus forms examined at the end of the experiment showed a similar pattern: Ca 2-P and O-P were higher in the surface soil (0-20 cm layer)than in the subsoil (20-40 cm layer) and Fe-P was higher in the subsoil than in the surface soil. Long-term application of P fertilizer increased various forms of inorganic phosphorus and total soil phosphorus in both layers. Increase in Ca 2-P,Ca 8-P,Al-P,O-P,Ca 10 -P and total soil P was significant in surface soil while their increase in the subsoil was relatively slight. A reverse tendency was observed for Fe-P, its increase being more significant in the 20-40 cm layer than in the 0-20 cm layer. Thus, the results suggest that under the influence of long practice of paddy-wheat rotation, P tends to move downwards.
出处
《西南农业大学学报（自然科学版）》
CSCD
2000年第2期123-125,共3页
Journal of Southwest Agricultural University
