《Table 1 Aboveground biomass percentage of species at nine sampling sites with ten replicates》

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《Altitude pattern of carbon stocks in desert grasslands of an arid land region》

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A detailed study was performed from July to October 2011 through a series of field vegetation surveys and soil samplings.Nine desert-grassland sites with consistent soil type and vegetation composition were selected，and some details about these sites are listed in Table 1.Ten quadrats of 1m×1m were set up along a 100-m sampling transect at each of the sites，and numbered 1 through 10.In each of the quadrats，the aboveground biomass（AGB）and litter-fall biomass（LFB）were estimated by the harvest method.In quadrats 1，3，5，7，and 9（five quadrats），belowground biomass（BGB）was estimated by excavating all plant roots from the 0–100-cm soil layer.AGB，BGB，and LFB samples were dried at 65°C for48 h in a hot-air oven and weighed for biomass measurement.These plant samples were then ground to<0.5 mm for C-content analysis.Soil samples were taken from quadrats 1，3，5，7，and 9 at depths of 0–5，5–10，10–20，20–30，30–50，50–70，and 70–100 cm.In quadrat 5，1-m-deep soil was excavated；and five cutting-ring samples corresponding to the following layers were obtained to determine the soil bulk density（BD）:0–5，5–10，10–20，20–30，30–50，50–70，and 70–100 cm.Soil samples were air-dried at room temperature and passed through a 2-mm sieve；and plant residues and visible organisms were removed.Gravel（>2 mm）was weighed，and the volumetric gravel percent（VGP）of the soil obtained.The sieved soil samples were then separated into two parts.One aliquot was used to determine the soil-particle-size distribution.Subsamples were further ground and passed through a 0.25-mm sieve；the resultant sample was used for the SOC-content analysis.