【摘要】 对河西绿洲灌区春小麦调亏灌溉2年后的土壤速效钾和全钾的变化进行了研究,并用配对样本t检验(双尾检验)对小麦收获时土壤钾素养分指标年际间的差异、土壤全钾与速效钾及其与全生育期调亏供水量间的关系进行了分析。结果发现,春小麦调亏灌溉对土壤钾素养分有明显影响,2004年小麦收获时0~20、20~40、0~40cm土层全钾、速效钾均显著低于2003年。回归分析发现,调亏灌溉春小麦收获时0~20 cm土层全钾和速效钾与小麦全生育期供水量呈线性正相关,0~20 cm和0~40 cm土层速效钾也随着全钾的增加呈显著线性增加的趋势。更多还原

【Abstract】 The dynamics of soil available potassium(SAK) and total potassium(STK)in spring wheat field after two years(2003 and 2004) of regulated deficit irrigation(RDI) were studied in Hexi oasis irrigation region,the differences in soil potassium indexes at harvest between the two experimental years were analyzed using Paired-Samples T Test(2-tailed),and the relationships between SAK,STK and the total amount of irrigation water(IR)throughout wheat growing seasons and that between SAK and STK were analyzed.The results showed that the soil potassium nutrients in spring wheat field were obviously affected by RDI,and STK and SAK in 0~20 cm,20~40 cm,and 0~40 cm layers at wheat harvest were significantly lower in 2004 than those in 2003.Regression analysis indicated that SAK and STK were linearly and positively correlated with IR during wheat growing season,while SAN was also linearly and significantly increased with the increase of STK in 0~20 cm and 0~40 cm layers.更多还原