TY  - Data
T1  - Soil Dataset Based on the Harmonized World Soil Database (HWSD v1.2)
A1  - None
DO  - 10.12072/ncdc.nieer.db2701.2023
PY  - 2023
DA  - 2023-01-17
PB  - National Cryosphere Desert Data Center
AB  - The data originates from the Harmonized World Soil Database version 1.2 (HWSD), jointly developed by the Food and Agriculture Organization (FAO) and the International Institute for Applied Systems Analysis (IIASA). Data for China are sourced from the 1:1,000,000-scale soil data provided by the Nanjing Institute of Soil Science during the Second National Land Survey. This dataset serves as input parameters for modeling and supports research on agro-ecological zoning, food security, and climate change from an agricultural perspective. The primary soil classification system used is FAO-90.1、Core Soil Mapping Unit Identifiers:(1)MU_GLOBAL: Unique identifier for soil mapping units in the HWSD, linked to GIS layers.(2)MU_SOURCE1 and MU_SOURCE2: Source database identifiers for mapping units.(3)SEQ: Sequence of soil units within composite mapping units.(4)Soil classification systems include FAO-7 (SU_SYM74), FAO-85 (SU_SYM85), and FAO-90 (SU_SYM90).2、Key Soil Attribute Fields:(1)ID: Database ID(2)MU_GLOBAL: Global soil unit identifier(3)SU_SYMBOL: Soil mapping unit symbol(4)SU_SYM74: FAO-74 classification(5)SU_SYM85: FAO-85 classification(6)SU_SYM90: FAO-90 classification(7)SU_CODE: Soil mapping unit code(8)SU_CODE74/SU_CODE85/SU_CODE90: Soil unit codes under respective FAO systems(9)DRAINAGE: Drainage class (19.5)(10)REF_DEPTH: Reference soil depth(11)AWC_CLASS: Available water capacity class (19.5)(12)PHASE1 (Real)/PHASE2 (String): Soil phase descriptors(13)ROOTS (String): Depth classification to restrictive layers(14)SWR (String): Soil water retention characteristics(15)ADD_PROP (Real): Soil type relevance to agricultural use(16)T_TEXTURE: Topsoil texture(17)T_GRAVEL (Unit: % vol.): Gravel content in topsoil(18)T_SAND/T_SILT/T_CLAY (Unit: % wt.): Sand, silt, and clay content in topsoil(19)T_USDA_TEX (Unit: name): USDA texture classification (topsoil)(20)T_REF_BULK (Unit: kg/dm³): Topsoil bulk density(21)T_OC (Unit: % wt.): Topsoil organic carbon(22)T_PH_H2O (Unit: -log(H
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/1fdf7dc7-7ecb-4e1f-a5df-30f7196756a8
ER  -