中文摘要：

以坝莜一号为材料，研究连续4a施用保水材料聚丙烯酰胺（PAM）与聚丙烯酸钾（PAM-K），对旱作农田不同土层土壤微生物量变化与相应土层土壤含水量、容重、电导率、养分及燕麦生长的影响。结果表明，旱区农田施用PAM-K和PAM的微生态效应存在时空差异，以连续施用4a效果最佳，其大小顺序表现为连续施用4a 〉 施用3a 〉 2a 〉 1a 〉 对照。连续施用4a PAM-K和PAM，0-60 cm土层土壤含水量平均增加了27.18%和34.40%；土壤容重、土壤电导率分别平均降低了2.33%和6.64%、29.50%和22.70%；相对显著增加了耕层土壤养分（有机质、碱解氮、有效磷、速效钾）含量；土壤微生物生物量碳、氮、磷增幅平均达24.11%、31.89%、46.52%和69.96%、35.21%、52.70%，尤其是连续施用4a PAM，10-20cm土层土壤微生物量氮增幅达98.95%及0-10cm、20-40cm土层土壤微生物生物量碳和土壤微生物量磷的增加最明显，增幅分别达31.13%和74.49%、62.27%和49.91%。连续施用4a PAM-K和PAM，植株鲜重、干重、株高、籽粒产量，分别增加了90.53%和146.91%、101.56%和128.13%、33.67%和76.39%、19.27%和22.40%。

英文摘要：

A four-year experiment was conducted to investigate the effects of polyacrylamide （PAM） and potassium polyacrylate （PAM-K） application on the growth characteristics of oat （Avena nuda L.） and soil at different soil depths and in different years （2011, 2012, 2013, and 2014）. The correlations between the growth characteristics of oat and soil microbial biomass, nutrients, moisture content, electrical conductivity, and bulk density at the respective soil layers in a dry land area of Inner Mongolia were also examined. PAM and PAM-K were applied at a rate of 75 kg/hm2 per year. The experiment consisted of a total of 8 treatments and a control. The application groups were as follows：conventional tillage （CK）, （1） M1：PAM 2011, （2） M2：PAM 2011 and 2012, （3） M3：PAM 2011, 2012, and 2013, （4） M4：PAM 2011, 2012, 2013, and 2014, （5） A1：PAM-K 2011, （6） A2：PAM-K 2011 and 2012, （7） A3：PAM-K 2011, 2012, and 2013, and （8） A4：PAM-K 2011, 2012, 2013, and 2014. This was a two-factor experiment involving a randomized complete block design with three replications. Each treatment occupied a plot area of 4×5 m. Water-retaining materials were spread equally on the surface of the land and then incorporated into the soil by tilling. Oat seeds were sown on May 25 and harvested in late September during the four experimental years （2011, 2012, 2013, and 2014） at a rate of 3750000 plants per hectare with a row spacing of 25 cm and seeding depth of 3-5 cm. With increasing PAM and PAM-K application, differences in micro-ecological effects were observed at different times for the rain-fed farmland. The results showed the following superiority order：4 years 〉 3 years 〉 2 years 〉 1 year. At a depth of 0-60 cm soil, compared with the control, for the treatments administered continuously for four years （A4 and M4）, soil moisture increased by an average of 27.18% in A4 and 34.40% in M4. A decreasing trend was observed for soil bulk density and soil electrical conduct