绿洲春小麦调亏灌溉对土壤磷素养分的影响研究

Effects of regulated deficit irrigation on soil phosphorus nutrients in spring wheat field

对甘肃省河西绿洲灌区春小麦调亏灌溉两年后土壤速效磷和全P变化进行了研究，并采用配对样本t检验（双尾检验）对小麦收获时土壤P素养分指标年际间的差异及其与全生育期调亏供水量、速效磷与全P的关系进行了回归分析。结果发现，春小麦调亏灌溉对土壤P素养分有显著影响，0～20cm和0～40cm土层土壤全P量和速效磷均与小麦全生育期供水量呈线性正相关；土壤速效磷随着全P量的增加呈线性增加趋势。且小麦全生育期供水量与土壤全P量和速效磷及速效磷与全P量的关系0～20cm和0～40cm土层极为一致。

The dynamics of soil available phosphorus（SAP）and total phosphorus（STP） in spring wheat field after two years of regulated deficit irrigation（RDl）were studied in Hexi oasis irrigable region. The differences in soil phosphorus indexes at harvest between two experimental years were analyzed using Paired-Samples T Test （2-tailed） ,and the relationships between SAP, STP and the total irrigation water amount（IR） throughout wheat growing seasons, and between SAP and STP were also regressed. Results show that the soil phosphorus nutrients in spring wheat field are significantly affected by RDI, and the STP and SAP in 0- 20cm and 0 - 40cm layers are positively linearly correlated with IR during wheat growing season, while SAP is linearly increased with STP increase. The relationships between SAP, STP and IR,and between SAP and STP in 0--20cm are similar to those in 0-40cm layers.