Soil Data Explorer - STILL

Official Series Description

Lab Data Summary

Aggregate lab data for the STILL soil series. This aggregation is based on all pedons with a current taxon name of STILL, and applied along 1-cm thick depth slices. Solid lines are the slice-wise median, bounded on either side by the interval defined by the slice-wise 5th and 95th percentiles. The median is the value that splits the data in half. Five percent of the data are less than the 5th percentile, and five percent of the data are greater than the 95th percentile. Values along the right hand side y-axis describe the proportion of pedon data that contribute to aggregate values at this depth. For example, a value of "90%" at 25cm means that 90% of the pedons correlated to STILL were used in the calculation. Source: KSSL snapshot (updated 2020-03-18). Methods used to assemble the KSSL snapshot used by SoilWeb / SDE

Pedons used in the lab summary:

MLRA	Lab ID	Pedon ID	Taxonname	CI	NSSL / NASIS Reports	Link To SoilWeb GMap
15	06N0207	PINN121	Still	7	Primary | Supplementary | Taxonomy | Pedon | Water Retention | Correlation | Andic Soil Properties	36.4939167,-121.1450278

Water Balance

Monthly water balance estimated using a leaky-bucket style model for the STILL soil series. Monthly precipitation (PPT) and potential evapotranspiration (PET) have been estimated from the 50th percentile of gridded values (PRISM 1981-2010) overlapping with the extent of SSURGO map units containing each series as a major component. Monthly PET values were estimated using the method of Thornthwaite (1948). These (and other) climatic parameters are calculated with each SSURGO refresh and provided by the fetchOSD function of the soilDB package. Representative water storage values (“AWC” in the figures) were derived from SSURGO by taking the 50th percentile of profile-total water storage (sum[awc_r * horizon thickness]) for each soil series. Note that this representation of “water storage” is based on the average ability of most plants to extract soil water between 15 bar (“permanent wilting point”) and 1/3 bar (“field capacity”) matric potential. Soil moisture state can be roughly interpreted as “dry” when storage is depleted, “moist” when storage is between 0mm and AWC, and “wet” when there is a surplus. Clearly there are a lot of assumptions baked into this kind of monthly water balance. This is still a work in progress.

Sibling Summary

Siblings are those soil series that occur together in map units, in this case with the STILL series. Sketches are arranged according to their subgroup-level taxonomic structure. Source: SSURGO snapshot (updated 2024-02-21), parsed OSD records (updated 2023-10-06) and snapshot of SC database (updated 2023-10-02).

Select annual climate data summaries for the STILL series and siblings. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the STILL series and siblings. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. Proportions can be interpreted as an aggregate representation of geomorphic membership. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Small Shannon entropy values suggest relatively consistent geomorphic association, while larger values suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).

There are insufficient data to create the 3D mountains figure.

Competing Series

Soil series competing with STILL share the same family level classification in Soil Taxonomy. Source: parsed OSD records (updated 2023-10-06) and snapshot of the SC database (updated 2023-10-02).

Select annual climate data summaries for the STILL series and competing. Series are sorted according to hierarchical clustering of median values. Source: SSURGO map unit geometry and 1981-2010, 800m PRISM data (updated 2023-10-09).

Geomorphic description summaries for the STILL series and competing. Series are sorted according to hierarchical clustering of proportions and relative hydrologic position within an idealized landform (e.g. top to bottom). Proportions can be interpreted as an aggregate representation of geomorphic membership. Most soil series (SSURGO components) are associated with a hillslope position and one or more landform-specific positions: hills, mountain slopes, terraces, and/or flats. The values printed to the left (number of component records) and right (Shannon entropy) of stacked bars can be used to judge the reliability of trends. Shannon entropy values close to 0 represent soil series with relatively consistent geomorphic association, while values close to 1 suggest lack thereof. Source: SSURGO component records (updated 2023-10-04).

There are insufficient data to create the 3D hills figure.

There are insufficient data to create the 3D mountains figure.

Soil series sharing subgroup-level classification with STILL, arranged according to family differentiae. Hovering over a series name will print full classification and a small sketch from the OSD. Source: snapshot of SC database (updated 2023-10-02).

Block Diagrams

No block diagrams are available.

Map Units

Map units containing STILL as a major component. Limited to 250 records.

Map Unit Name	Symbol	Map Unit Area (ac)	Map Unit Key	National Map Unit Symbol	Soil Survey Area	Publication Date	Map Scale
Still loam, stratified substratum	233	6733	459636	hf8z	ca033	1985	1:24000
Still gravelly loam	234	1800	459637	hf90	ca033	1985	1:24000
Still loam	232	1581	459635	hf8y	ca033	1985	1:24000
Still-Talmage complex, 2 to 8 percent slopes	235	1180	459638	hf91	ca033	1985	1:24000
Still clay, 0 to 2 percent slopes	119	3	1861980	20hjw	ca069	1965	1:20000
Urban land-Still complex, 0 to 2 percent slopes	130	8164	1543353	1nszl	ca641	2009	1:24000
Urban land-Still complex, 2 to 5 percent slopes	129	292	2390846	2l7w2	ca641	2009	1:24000
Still gravelly sandy clay loam, 2 to 9 percent slopes	210	2900	457182	hbqt	ca664	1977	1:24000
Still gravelly sandy clay loam, 0 to 2 percent slopes	209	680	457181	hbqs	ca664	1977	1:24000
Still gravelly loam, 9 to 15 percent slopes	208	295	457180	hbqr	ca664	1977	1:24000
Still gravelly sandy clay loam, 15 to 25 percent slopes	211	255	457183	hbqv	ca664	1977	1:24000
Still clay loam, 0 to 2 percent slopes	208	4420	457311	hbvz	ca665	1977	1:24000
Still clay loam, 2 to 9 percent slopes	209	1615	457312	hbw0	ca665	1977	1:24000
Still gravelly loam, 0 to 2 percent slopes	207	695	457310	hbvy	ca665	1977	1:24000
Urban land-Still complex, 0 to 2 percent slopes	130scl	63	2483800	2pcll	ca689	1985	1:24000
Still clay loam, 0 to 2 percent slopes	208pr	31	1412877	1jf6p	ca772	1981	1:24000
Still gravelly loam, 0 to 2 percent slopes	207pr	3	1412876	1jf6n	ca772	1981	1:24000
Still clay loam, 2 to 9 percent slopes	209pr	1	1412878	1jf6q	ca772	1981	1:24000
Still-Riverwash complex, 0 to 2 percent slopes	128	98	2426436	2mfx4	ca788	2007	1:24000
Still clay, 0 to 2 percent slopes	119	46	2426431	2mfwz	ca788	2007	1:24000

Map of Series Extent

Approximate geographic distribution of the STILL soil series. To learn more about how this distribution was mapped, or to compare this soil series extent to others, use the Series Extent Explorer (SEE) application. Source: generalization of SSURGO geometry (updated 2023-10-04).