Source: IPCC Good Practice Guidance for LULUCF – Table 3.2.4
Region |
HAC soils1 |
LAC soils2 |
Sandy soils3 |
Spodic soils4 |
Volcanic soils5 |
Wetlands soils6 |
Boreal |
68 |
NA |
10# |
117 |
20# |
146 |
Cold temperate, dry |
50 |
33 |
34 |
NA |
20# |
87 |
Cold temperate, moist |
95 |
85 |
71 |
115 |
130 | |
Warm temperate, dry |
38 |
24 |
19 |
NA |
70# |
88 |
Warm temperate, moist |
88 |
63 |
34 |
NA |
80 | |
Tropical, dry |
38 |
35 |
31 |
NA |
50# |
86 |
Tropical, moist |
65 |
47 |
39 |
NA |
70# | |
Tropical, wet |
44 |
60 |
66 |
NA |
130# | |
Note: Data are derived from soil databases described by Jobbagy and Jackson (2000) and Bernoux et al. (2002). Mean stocks are shown. A default error estimate of 95% (expressed as 2X standard deviations as percent of the mean are assumed for soil-climate types. NA denotes ‘not applicable’ because these soils do not normally occur in some climate zones. # indicates where no data were available and default values from 96 GL were retained. 1 Soils with high activity clay (HAC) minerals are lightly to moderately weathered soils, which are dominated by 2:1 silicate clay minerals (in the World Reference Base for Soil Resources (WRB) classification these include Leptosols, Vertisols, Kastanozems, Chernozems, Phaeozems, Luvisols, Alisols, Albeluvisols, Solonetz, Calcisols, Gypsisols, Umbrisols, Cambisols, Regosols; in USDA classification includes Mollisols, Vertisols, high-base status Alfisols, Aridisols, Inceptisols). 2 Soils with low activity clay (LAC) minerals are highly weathered soils, dominated by 1:1 clay minerals and amorphous iron and aluminium oxides (in WRB classification includes Acrisols, Lixisols, Nitisols, Ferralsols, Durisols; in USDA classification includes Ultisols, Oxisols, acidic Alfisols). 3 Includes all soils (regardless of taxonomic classification) having > 70% sand and < 8% clay, based on standard textural analyses (in WRB classification includes Arenosols,; in USDA classification includes Psamments). 4 Soils exhibiting strong podzolization (in WRB classification includes Podzols; in USDA classification Spodosols) 5 Soils derived from volcanic ash with allophanic mineralogy (in WRB classification Andosols; in USDA classification Andisols) 6 Soils with restricted drainage leading to periodic flooding and anaerobic conditions (in WRB classification Gleysols; in USDA classification Aquic suborders). | ||||||
