usable field capacity of soil (KLZ Soil Estimation)

Usable field capacity of the soil up to 100 cm profile depth is the amount of soil water in volume % or mm of water column that it can bind at a defined suction voltage between pF = 1.8 and pF = 4.2 or in pores with an equivalent diameter between 50 µm and 0.2 µm. The classification is carried out according to KA5, p. 349, tab 74. For soils where skeletons or solid rocks are at a lower depth, the data refer to the thickness of the soluum: Classification: very low < 6 vol.- %, low 6 to < 14 % vol.-%, average 14 to < 22 % vol., high 22 to < 30 % vol., very high >= 30 vol.-% (this range of values is not occupied on map).土壤100cm剖面深度内的有效田间持水量，指土壤在设定土水吸力对应pF值介于1.8至4.2之间（或等效孔径为50μm至0.2μm的孔隙）时所能保持的土壤水分含量，以体积百分比或水柱毫米数为计量单位。本分类依据KA5第349页表74执行。 对于下层埋藏有骨架或硬质岩层的土壤，相关数据以有效土体（soluum）的厚度为基准计算，具体分类标准如下： 极低：<6 体积百分比， 低：6 至 <14 体积百分比， 中等：14 至 <22 体积百分比， 高：22 至 <30 体积百分比， 极高：≥30 体积百分比（该数值区间未在地图中被涵盖）。