保水剂对土壤孔隙影响的定量分析

Quantitative analysis of the effect of water-retaining agent on soil pores

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 ascertain the effect of water-retaining agent on the characteristics and distribution of soil pore in different soil layers,the technique of CT（Computed Tomography） scan was used to study characteristics of soil porosity under potted experiment when Triticum aestivum L.harvesting.The results indicated that soil pore number,porosity and pore round rate increased after application of water-retaining agent,which promoted transmission of soil moisture and nutrition.With the increase of applied water-retaining agent,average total pore number,total porosity and into round rate in different soil layers increased,but over a certain amount of applied water-retaining agent the total number of pore increased not obviously,while total porosity and pore round rate decreased,but still higher than the control（CK）.The order of biomass and yield of wheat applied with water-retaining agent was as follows： 54 mg/kg81 mg/kg〉27 mg/kgCK.It was concluded that water retaining-agent improved characteristics of soil pore,promoted the growth of Triticum aestivum L.and increased yield.In addition,among different treatments the effect of treatment by appling 54 mg/kg of water-retaining agent on the biomass and yield was the highest,and compared to control,the biomass and yield increased by 13.1% and 22.2% respectively.