Citation:

PANGAEA.965004 (dataset in review)

Name: Dataset of Soil Hydraulic Parameters in the Yellow River Basin
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Deep profile; In situ sampling; Soil hydraulic parameters; Yellow River Basin

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Abstract:

Soil hydraulic parameters are vital for precise characterization of soil hydrological processes. Although many studies have integrated comprehensive soil datasets, availability of data in sufficient quality remains limitted, especially for deep soil information from in-situ measurement.

This dataset contains soil hydraulic parameter data, including 2924 soil texture, 2798 bulk density (BD), 2782 saturated hydraulic conductivity (Ks), and 1035 soil water retention curve (SWRC) parameter records down to a maximum profile depth of 5 m. It encompasses the entire Yellow River Basin (795,000 km²) which ranking as the fifth longest river in the world. Soil samples were obtained using high-density in situ field sampling at 475 sites from 2008 to 2019.

The soil texture, BD, and Ks were directly measured from field samples. Mastersizer laser particle size analysers (Mastersizer 3000, Malvern Panalytical, UK) were used to determine soil particle size distribution and the classification of soil texture followed USDA standards. The undisturbed soil samples were initially immersed for 24 h to achieve full saturation, before we performed the determination of Ks using the constant-head method. The SWRC were measured by centrifuge (CR21N, Hitachi, Japan) first and we then used soilhypfit package in R (4.2.3) to predict SWRC parameters. The BD was assessed by oven-drying method (at 105°C for 10 h). All data underwent quality checks, and the dataset includes detailed annotations regarding the testing methods and data quality for various parameters.

Keyword(s):

Deep profile; In situ sampling; Soil hydraulic parameters; Yellow River Basin

Supplement to:

Tong, Yongping; Wang, Yunqiang; Zhou, Jingxiong; Guo, Xiangyu; Wang, Ting; Xu, Yuting; Sun, Hui; Zhang, Pingping; Li, Zimin; Lauerwald, Ronny (in review): Dataset of Soil Hydraulic Parameters in the Yellow River Basin Based on In Situ Deep Sampling. Scientific Data

Funding:

National Key Research and Development Program of China, grant/award no. 2019YFA0607303

National Natural Science Foundation of China (NSFC), grant/award no. 41977422

Coverage:

Median Latitude: 36.718013 * Median Longitude: 108.556430 * South-bound Latitude: 33.434925 * West-bound Longitude: 97.328725 * North-bound Latitude: 41.079220 * East-bound Longitude: 118.705833

Minimum Elevation: 5.0 m * Maximum Elevation: 4274.0 m

Event(s):

Yellow_River_Basin_1 * Latitude: 37.403333 * Longitude: 101.701667 * Elevation: 2960.0 m * Location: China * Method/Device: Soil sample (SOILS)

Yellow_River_Basin_2 * Latitude: 36.522778 * Longitude: 101.663889 * Elevation: 2550.0 m * Location: China * Method/Device: Soil sample (SOILS)

Yellow_River_Basin_3 * Latitude: 35.492500 * Longitude: 101.993889 * Elevation: 2740.0 m * Location: China * Method/Device: Soil sample (SOILS)

Comment:

Principal Investigator (PI) for all parameters are Yunqiang Wang and Yongping Tong.

Further method/device information:

* Soil texture quality: The absolute difference between the sum of particle size distribution and 100%, Level A (<1%), Level B (1%≤difference<2%), and Level C (2%≤difference<3%)

* Field capacity [fit_FC] and Permanent wilting point [PWP]: Predicted by fitted SWRC curve based on 'soilhypfit' package in R (4.2.3)

* Soil saturated water conductivity [Ks]: Constant-head method

* Coefficient of determination [fit_r²]: Coefficient of determination when fitting SWRC based on 'soilhypfit' package in R

* Error, relative [θs_RE]: The absolute value of ((meaured_θs - fit_θs) / 100)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Wang, Yunqiang
2	Identification	ID		Wang, Yunqiang		ID of the sampling site
3	Sample ID	Sample ID		Wang, Yunqiang		ID of samples at each sampling site
4	LONGITUDE	Longitude		Wang, Yunqiang	WGS84	Geocode
5	LATITUDE	Latitude		Wang, Yunqiang	WGS84	Geocode
6	ELEVATION	Elevation	m a.s.l.	Wang, Yunqiang		Geocode – Of the surface of the sampling site
7	Land use	Land use		Wang, Yunqiang		Land-use type of the sampling site
8	Year of sampling	Year sampl		Wang, Yunqiang		The year in which the soil sample was collected
9	DEPTH, soil	Depth soil	m	Wang, Yunqiang		Geocode – The depth at which the soil sample was collected
10	Clay	Clay	%	Wang, Yunqiang	Particle size analyzer, Malvern Panalytical, Mastersizer 3000 laser	Clay (< 0.02 mm) content in soil samples
11	Silt	Silt	%	Wang, Yunqiang	Particle size analyzer, Malvern Panalytical, Mastersizer 3000 laser	Silt (0.02 -0.5 mm) content in soil samples
12	Sand	Sand	%	Wang, Yunqiang	Particle size analyzer, Malvern Panalytical, Mastersizer 3000 laser	Sand (> 0.5 mm) content in soil samples
13	Analytical method	Method		Wang, Yunqiang		Method for measuring soil particle composition
14	Soil texture quality	Soil texture quality		Wang, Yunqiang	Calculated, see Comment	Quality level of soil particle composition measuring, the levels of 'A', 'B' and 'C' represent high, medium and low data quality, respectively
15	Soil texture classification	Soil texture class		Wang, Yunqiang	USDA soil taxonomy	Based on USDA (broad categories (class 1))
16	Soil texture classification	Soil texture class		Wang, Yunqiang	USDA soil taxonomy	Based on USDA (subclasses (class 2))
17	Density, dry bulk	DBD	g/cm³	Wang, Yunqiang	Oven dried at 105°C for 10 hours	Bulk density of soil
18	Analytical method	Method		Wang, Yunqiang		Method for measuring soil bulk density
19	Conductivity, hydraulic, saturated	Ks	cm/min	Wang, Yunqiang	see comment	Soil saturated water conductivity
20	Analytical method	Method		Wang, Yunqiang		Method for measuring soil saturated water conductivity
21	Analytical method	Method		Wang, Yunqiang		Method for measuring soil water retention curves
22	Soil water content, volumetric	vol SWC	m³/m³	Wang, Yunqiang	Centrifuge, Hitachi, CR21N	[meaured_θs] Measured saturated soil water content from soil samples
23	Soil water content, volumetric	vol SWC	m³/m³	Wang, Yunqiang	Calculated, based on soilhypfit package in R (4.2.3)	[fit_θs] Fitted saturated soil water content
24	Soil water content, volumetric	vol SWC	m³/m³	Wang, Yunqiang	Calculated, based on soilhypfit package in R (4.2.3)	[fit_θr] Fitted residual soil water content
25	Residual value	Residual		Wang, Yunqiang	Calculated, based on soilhypfit package in R (4.2.3)	[fit_α; m] Fitted shape parameter of van Genuchten model
26	Residual value	Residual		Wang, Yunqiang	Calculated, based on soilhypfit package in R (4.2.3)	[fit_n] Fitted shape parameter of van Genuchten model
27	Residual value	Residual		Wang, Yunqiang	Calculated, based on soilhypfit package in R (4.2.3)	[fit_m] Fitted shape parameter of van Genuchten model
28	Field capacity	thetaFC		Wang, Yunqiang	Calculated, see Comment	[fit_FC; m³/m³] Field capacity
29	Permanent wilting point, soil	PWP		Wang, Yunqiang	Calculated, see Comment	[fit_PWP; m³/m³] Permanent wilting point
30	Coefficient of determination	R**2		Wang, Yunqiang		[fit_r²] Coefficient of determination when fitting SWRC based on 'soilhypfit' package in R
31	Error, relative	Error r	%	Wang, Yunqiang	Calculated, see Comment	[θs_RE] Absolute relative error of fitted and measured saturated soil water content
32	Quantile range	Quantile range		Wang, Yunqiang		[θs_RE _range] Quantile range of absolute relative error of fitted and measured saturated soil water content. 'Q1', 'Q3', 'Min', and 'Max' represent the 'first quartile', 'third quartile', 'Q1 minus 1.5IQR', and 'Q3 plus 1.5IQR', respectively. '-' is used for the range of values.

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

57916 data points

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