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Table 1 Composition of wheat straw under different treatments (dry matter basis)

From: The effect of increased atmospheric temperature and CO2 concentration during crop growth on the chemical composition and in vitro rumen fermentation characteristics of wheat straw

Item, g/100 g CK CO2 TEM CO2 + TEM S.E.M P- Value1
Dry matter 94.37 ± 0.11a 95.25 ± 0.31bc 94.60 ± 0.12ab 95.57 ± 0.24c 0.17 *
Crude ash 4.46 ± 0.10a 4.56 ± 0.14a 3.49 ± 0.13b 3.69 ± 0.13b 0.15 *
Crude protein 1.45 ± 0.05ab 1.29 ± 0.03bc 1.59 ± 0.06a 1.17 ± 0.06c 0.05 *
Ether extracts 0.70 ± 0.07b 0.57 ± 0.04b 0.92 ± 0.02a 0.64 ± 0.02b 0.04 *
Neutral detergent fiber 82.95 ± 0.03a 82.98 ± 0.19a 82.96 ± 0.23a 84.72 ± 0.16b 0.24 *
Acid detergent fiber 52.47 ± 0.76 52.52 ± 0.66 52.59 ± 0.46 53.96 ± 0.69 0.33 ns
Hemicellulose 30.48 ± 0.77 30.46 ± 0.84 30.65 ± 0.37 31.09 ± 0.28 0.27 ns
Acid detergent lignin 6.31 ± 0.24 6.45 ± 0.15 6.57 ± 0.13 7.02 ± 0.29 0.12 ns
  1. CK control, concentration of CO2 413 μmol/mol and average temperature 10.5 °C; CO 2 elevated CO2 group, concentration of CO2 500 μmol/mol; TEM elevated temperature group, average temperature 12.5 °C; CO 2  + TEM, elevated CO2 and temperature group, i.e., concentration of CO2 500 μmol/mol, temperature 12.5 °C. The same as below
  2. a,b,cValues within a column with different superscript letters are significantly different (P < 0.05)
  3. 1ns = non-significant (p > 0.05), * = significant (P < 0.05)