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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)