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<br />.. <br /> <br />SOILS <br /> <br />The soils that will be affected by cloud seeding and precipitation <br />modification in the American River Drainage System are primarily in <br />an area where soil temperature and moisture conditions do not favor <br />chemical weathering as a soil forming factor. Because of this, few <br />soils have strongly developed profiles or textures finer than loams. <br />Here the weathering processes overshadow the effect of geologic <br />materials upon the soil textures. Wet meadows are fOWld at all ele- <br />vations varying in size from large areas down to narrow stringers <br />along drainageways. The soils have not been studied in detail in <br />the past, but are similar to Humaquepts, Ctyaquepts, or wet-Uni>repts. <br /> <br />.. <br /> <br />In the Lower Montane, 1520 to 1830 m (5000 to 6000 ft), the soils are <br />moderately deep, to deep, to a lithic, para1ithic, or duripan contact <br />with sandy loam and gravelly sandy loam textures. These soils usually <br />have dark surface horizons that are relatively high in organic matter <br />and have pale brown subsoils. Some shallow soils are scattered <br />throughout the area. The amoWlt of water held by the soils available <br />for plant use ranges from moderate to low. Most soils will fall into <br />'one of the following Great Groups: Xerumbrepts, Haplwnbrepts, <br />Xerochrepts, and Hap1oxerolls with mesic and some frigid soil tem- <br />perature regimes (U.S. Soil Conservation Service [4]). <br /> <br />11 <br />