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为探明保水剂不同用量对施入土层土壤孔隙特征及其分布的影响,采用CT扫描法研究盆栽试验条件下小麦收获时的土壤孔隙特征。结果表明:1)施用保水剂均提高了土壤剖面不同土层的土壤孔隙数目、孔隙度和孔隙成圆率。2)随保水剂用量的增加,各土层平均总孔隙数、总孔隙度及成圆率提高;但保水剂用量过高,其总孔隙数增加不明显,总孔隙度和孔隙成圆率降低,但仍高于对照(CK)。3)最终的小麦生物量和籽粒产量表现为54 mg/kg>81 mg/kg>27 mg/kg>CK。因此,施用保水剂改善了土壤孔隙特征,促进了小麦的生长和产量的提高。各处理中以54 mg/kg保水剂用量对于小麦生物量及产量的提高最为显著,分别较对照提高13.1%和22.2%。
In order to find out the effect of different amount of super absorbent polymer on soil pore characteristics and its distribution in soil, CT scanning method was used to study the characteristics of soil porosity at harvest in pot experiment. The results showed that: 1) All the soil water-retaining agents increased the number of soil pores, porosity and porosity in different soil layers. 2) With the increase of the amount of SAP, the average total porosity, total porosity and roundness of each soil layer increased; However, the amount of super absorbent polymer, the total porosity was not significantly increased, the total porosity and porosity decreased , But still higher than the control (CK). 3) The final wheat biomass and grain yield were 54 mg / kg> 81 mg / kg> 27 mg / kg> CK. Therefore, the application of water-retaining agent improved soil pore characteristics and promoted the growth and yield of wheat. In each treatment, the amount of 54 mg / kg SAP was the most significant increase for biomass and yield of wheat, which increased by 13.1% and 22.2% respectively compared with the control.