《Table 1 Characteristics of the 10 representative landscapes in the Heihe River Basin (HRB)》

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《"Vertical distribution and storage of soil organic and inorganic carbon in a typical inland river basin, Northwest China"》

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Note:AM，alpine meadow；SSM，subalpine shrub and meadow；MG，mountain grassland；MF，mountain forest；TS，typical steppe；DS，desert steppe；HCO，Hexi Corridor oases cropland；RDD，Ruoshui River delta desert；AGD，Alxa Gobi desert；SD，sandy desert.It should be not

A total of 10 representative landscapes were selected in the HRB（Table 1）:alpine meadow（AM），subalpine shrub and meadow（SSM），mountain grassland（MG），mountain forest（MF），typical steppe（TS），desert steppe（DS），Hexi Corridor oases cropland（HCO），Ruoshui River delta desert（RDD），Alxa Gobi desert（AGD），and sandy desert（SD）.Field soil survey and sampling were conducted during the summer months（July to August）of 2012 and 2013.Three sampling sites were set in each landscape，with a total of 30 sites in the whole study area（Fig.1）.Geographic coordinates and elevations of each sampling site were recorded using a GPS unit（Juno SB，Trimble，USA），and the plant species were also recorded.In each sampling site，a soil pit was hand dug to a depth of 120 cm（or bedrock）.Soil samples were collected according to genetic horizons（Appendix，Table S1）.The samples were air-dried and then sieved through a 2-mm nylon mesh.A subsample of the air-dried sample was ground using a pestle and mortar to pass through a 0.25-mm nylon sieve before laboratory analyses of SOC and Ca CO3 contents.In addition，undisturbed soil samples from each genetic horizon were collected in triplicate using a cutting ring（5 cm in diameter and 5 cm in height）for bulk density（BD）determination.The volume percentage of coarse fragments（diameter>2 mm）was determined by visual estimation in the field.