Water storage capacity of the soil

For the assessment of the sub-soil function ‘component of the water cycle habitat’, the criterion ‘water storage capacity of the soil’ is used, among other things. Soils absorb rainwater and store it in their soil pores. Thus, they have a significant influence on the water balance. A high water storage capacity distinguishes soils as particularly worthy of protection. The evaluation of the "water storage capacity" is carried out by assessing the usable field capacity of the potential root space up to a soil depth of maximum 1.5 meters. The characteristics for this are: Soil type of the fine soil, coarse soil fractions, rooting depth, usable field capacity, soil density and humus contents of the soil. Mapping data (guide profile data) of the FIS Soil of the Free State of Saxony are used to derive the water storage capacity. Soils with a high slope receive valuation discounts. The assessment does not directly assess the terrain position and climatic site conditions, although these are relevant for water storage capacity.

为评估土壤亚功能“水循环生境组成部分”，本次评估采用的核心评判标准之一为“土壤储水能力”。土壤能够吸收雨水并将其储存于土壤孔隙中，因此对区域水平衡具有显著调控作用。土壤储水能力越高，其生态保护优先级越高。“土壤储水能力”的评估通过测算最大深度1.5米以内的潜在根系空间的田间有效持水量完成。本次评估涉及的特征参数包括：细粒土壤类型、粗粒土壤组分、根系深度、田间有效持水量、土壤容重以及土壤腐殖质含量。本次评估采用萨克森自由州土壤信息系统（FIS Soil）的制图数据（即标准剖面数据）推导土壤储水能力。坡度较高的土壤将被扣除相应的评估分值。尽管地形位置与气候立地条件对土壤储水能力存在影响，但本次评估并未直接对这两项因素开展测算。