保水剂对草坪土壤持水特性影响研究

为了探明保水剂对草地种植条件下土壤水分特征曲线的影响，基于王全九等开发的入渗特性法进行了土壤水平入渗试验，得出了在草坪土壤中施用不同浓度保水剂的Brooks-Corey土壤水分特征曲线。结果表明：在低吸力段，相同水势下土壤含水量随保水剂施用浓度增大而增大，在高吸力段，相同水势下土壤含水量随保水剂施用浓度增大而减小；在0~1 bar范围内，施用保水剂处理的土壤水分特征曲线均匀降低，表明施用保水剂能够稳定而有效地供给植物所需水分。本研究可以为制定城市绿地草坪合理的灌溉制度和在草坪种植中合理推广使用保水剂提供理论依据。

Study on influence of super absorbent polymer on soil water retention capability of lawn

In order to prove up the influence of super absorbent polymer on the soil water retention curve under the planting condition of lawn，a soil horizontal infiltration experiment is made based on the Horizontal Infiltration Method developed by WANG Quanjiu，etc.，and then the Brooks-Corey soil water retention curve of the lawn soil applied with the super absorbent polymer with various concentrations is obtained. The result shows that in the lower-suction section，the soil water content increases along with the increase of the applied concentration of the super absorbent polymer under the same water potential，while the soil water content decreases along with the increase of the applied concentration of the super absorbent polymer under the same potential in the higher-suction section. Within the range of 0~1 bar，the water retention curve of the soil applied with the super absorbent polymer declines uniformly，which demonstrates that the application of the super absorbent polymer can steadily and effectively supply the water necessary for plants. This study can provide a theoretical basis for establishing a reasonable irrigation schedule for the urban lawn and reasonably popularizing the application of the super absorbent polymer to the lawn planting.