BFD50 - BFD50: usable field capacity in rootable soil - OGC API Features

The soil overview map in scale 1:50.000 (BK50) provides an overview of the distribution of soil and soil-forming substrates for the entire area of Rhineland-Palatinate. The near-surface subsurface is depicted to a depth of two metres. Due to scale, the legend units of the soil map are composed of soil form societies (BFG), which are described via several use-differentiated soil forms (BF). The leading soil shape is the soil shape that has the largest area in a BFG. Their name is also the name of the BFG.: The usable field capacity of a soil is the part of the field capacity that is available for vegetation. It contains the amount of water that a site far from groundwater can retain against gravity in natural storage after sufficient saturation and corresponds to a suction voltage of pF 1.8 to 4.2 according to the convention.

比例尺为1:50000的土壤概图（BK50）可全面呈现莱茵兰-普法尔茨州全域的土壤及成土基质分布情况。该图展示了深度达2米的近地表地下层。受比例尺限制，该土壤图的图例单元由土壤形态群（soil form societies, BFG）构成，此类单元通过多种按用途区分的土壤形态（soil forms, BF）进行详细说明。在一个土壤形态群中，面积占比最大的土壤形态即为优势土壤形态，其名称同时也是该土壤形态群的名称。
土壤有效持水量是指田间持水量中可供植被利用的部分，指远离地下水的地块在充分饱和后，可依托自然储水空间对抗重力留存的水量；按照行业惯例，该水量对应的吸力势范围为pF 1.8至4.2。