Table 4.
Evaluation of degraded land in the Heihe River Basin
| Ranks | Categories | Land-use types | Area (km2) |
|---|---|---|---|
| Slight (5,221.0 km2) | Vegetation degradation | Middle mountain-Stipa spp., Sympegma regelii, Reaumuria soongorica-Hap-Orthic Aridisols | 907.9 |
| Loam flat- Sympegma regelii, Salsola passerine, Artemisia spp.-Hap-Orthic Aridisols-Loam flat | 254.7 | ||
|
| |||
| Water erosion | Sub-alpine-Crops-Mot-Ustic Cambisols | 428.0 | |
| Middle mountain-Crops- Mot-Ustic Cambisols | 39.4 | ||
| Middle mountain-Stipa,Salsola passerine-Hap-Orthic Aridisols | 1,292.9 | ||
|
| |||
| Salinization | Artificial oasis-Crops-Pas-Sil-Orthic anthrosols | 302.2 | |
| Wet Bottomland-Phragmites communis, Achnatherum splendens-Mot-Ustic Cambisols | 911.9 | ||
|
| |||
| Sandification | Stabilised dune-Tamarix spp. Haloxylon ammodendron, Nitraria spp.-Ari-Sandic Entisols | 1,084.0 | |
|
| |||
| Moderate (7,669.2 km2) | Vegetation degradation | Middle mountain river valley-Carerx Montana, Kobresia spp., weeds-Mot-Udic Cambisols | 36.8 |
| Alluvial flood plain-Stipa spp., Salsola passerine, Artemisia spp.-Cal-Orthic Aridisols | 64.5 | ||
|
| |||
| Water erosion | Middle mountain-Crops-Cal-Ustic Isohumisols | 107.1 | |
| Middle mountain-Caragana stenophylla,Stipa krylovii-Hap- Ustic Isohumisols | 245.3 | ||
|
| |||
| Aridization | Bottomland-Phragmites communis, Achnatherum splendens, Glycyrrhiza inflate-Mot- Ustic Cambisols | 829.5 | |
| Wet Bottomland-Populus euphratica, Elaeagnus angustifolia, Tamarix spp.-Och-Aquic Cambisols | 339.9 | ||
|
| |||
| Salinization | Wet Bottomland-Phragmites communis, Tamarix spp., Sophara alopecuroides, Lycium uthenicum-Pas-Gen-Aquic Cambisols | 2,830.6 | |
| Artificial forest-Elaeagnus angustifolia, Populus spp.-Pas-Sil-Ustic Cambisols | 67.7 | ||
|
| |||
| Wet Bottomland- Tamarix spp., Phragmites communis, Elaeagnus angustifolia, Populus euphratica-Pas-Och-Aquic Cambisols | 433.0 | ||
|
| |||
| Sandification | Semi- Stabilised dune-Haloxylon ammodendron, Reaumuria soongorica-Ari-Sandic Entisols | 1,264.1 | |
| Semi- Stabilised dune-Artemisia spp., Populus euphratica, Tamarix spp.- Ari-Sandic Entisols | 1,450.7 | ||
|
| |||
| Moderate to severe (2,156.6 km2) | Vegetation degradation | Wet bottomland-Phragmites communis, Achnatherum splendens, Aneurolepidium dasystachys, Calamagrogstis spp.-Gen-Aquic Cambisols-Wet bottomland | 26.5 |
|
| |||
| Water erosion | Middle mountain-Stipa spp.,Sympegma regelii-Cal- Orthic Aridisols | 213.3 | |
| Low mountain- Crops-Cal-Ustic Isohumisols | 130.2 | ||
|
| |||
| Salinization | Bottomland-Phragmites communis, Tamarix spp., Populus euphratica-Aqu-Orthic Halosols | 1,436.3 | |
|
| |||
| Sandification | Sandy flat-Ari-Sandic Entisols | 350.3 | |
|
| |||
| Severe (14,308.7 km2) | Water erosion | Middle mountain Crops-Hap-Ustic Isohumisols | 345.2 |
| Middle mountain-Agropyron cristatum, Stipa spp.- Cal-Ustic Isohumisols | 1,914.4 | ||
| Middle mountain- Stipa spp., Artemisia frigida, Caragana spp.- Hap-Ustic Isohumisols | 1,216.8 | ||
|
| |||
| Salinization | Bottomland-Kalidium gracile, Lycium ruthenicum, Orthic Halosols alostachys belangeriana, Tamarix spp.-Ari- Orthic Halosols | 362.0 | |
| Loam flat-Karelinia caspica, Glycyrrhiza inflate, Tamarix spp., Phragmites communis, Aqu-Orthic Halosols | 2,554.4 | ||
| Bottomland- Ari- Orthic Halosols | 1,493.2 | ||
|
| |||
| Sandification | Mobile dune-Ari-Sandic Entisols | 6,422.7 | |
|
| |||
| Total degraded land | 29,355.5 | ||