坡度因素代表了土壤的持水能力，对径流和地下水有影响；
Slope would change water storage capacity. Distance is used to represent the water utilization capacity.
施用聚丙烯酸钾盐型保水剂可以增强红壤与风沙土的持水能力。
Application potassium-polyacrylate water retaining agent can strengthen water retention ability of red soil and sandy soil.
覆盖作物可改善土壤持水能力，但是对土壤硬度的影响与土壤含水率有关。
Cover crops can improve the water holding ability of soil; however, its effect on soil hardness depends on the moisture content of soil.
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