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本文以土壤结构调理剂(PAM)为测试材料,于砂壤土大田表面干撒PAM(浓度为2.25g/m2),取样测试这一土壤改良措施的实际应用效果。通过野外调查取样和室内实验,测定了在土壤表面撒施PAM后,不同层次土壤的物理性质指标。试验结果表明:砂壤土农田施用PAM,可以起到改良土壤物理性质的作用。试验测试的土壤8项物理性质指标,均有不同程度的影响。测试的3个层次中(0cm-10cm、10cm-20cm、20cm-30cm),0cm-10cm和10cm-20cm表现较为显著,20cm-30cm的方差分析结果不具有显著的差异。0cm-10cm和10cm-20cm两个土层的饱和含水量较对照分别提高了37.6%和26.3%,毛管持水量提高了30.7%和20.8%,田间持水量提高29.3%和23.5%,土壤容重降低了7.8%和6.9%,0cm-10cm土层的土壤含水率较对照提高了28.0%,总孔隙度较对照提高27.0%。本论文的结果将为PAM在干旱、半干旱地区,砂壤土农田土壤的应用提供理论依据,同时可以分析探讨PAM改良砂壤土方面的作用机理。
In this paper, soil structure conditioners (PAM) as the test material, the surface of sandy loam soil dry PAM (concentration of 2.25g / m2), sampling and testing the practical application of soil improvement measures. Field survey sampling and laboratory experiments were conducted to determine the physical properties of soils at different soil layers after PAM was applied on the soil surface. The results showed that the application of PAM in sandy loam farmland could play an important role in improving soil physical properties. Eight soil physical properties of the test test indicators, have varying degrees of impact. Among the three levels of testing (0cm-10cm, 10cm-20cm, 20cm-30cm), 0cm-10cm and 10cm-20cm showed more remarkable results. There was no significant difference in ANOVA results of 20cm-30cm. The saturated water content of 0 cm-10 cm and 10 cm-20 cm soil layers increased by 37.6% and 26.3% respectively compared with the control, capillary water holding capacity increased by 30.7% and 20.8%, field capacity increased by 29.3% and 23.5%, soil bulk density decreased 7.8% and 6.9% respectively. The soil moisture in 0cm-10cm soil layer increased by 28.0% compared with the control and the total porosity was increased by 27.0% compared with the control. The results of this paper will provide a theoretical basis for the application of PAM in arid and semi-arid areas of sandy loam farmland soil, and at the same time analyze the mechanism of action of PAM in improving sandy loam.