In this interesting PDF document - which also comprises useful data on a whole range of aspects for biomass gasification for hydrogen production - page 7 gives data for syngas composition for oak and pine biomass for various temperatures.
On average, the four largest constituents (by volume) are H2 (30-50%), CO (10-30%), CO2 (20-25%) and CH4 (5-15%). As can be seen from the percentages provided, the biggest variations (with temperature) happen for H2 and CO. What can also be seen from the data provided in the PDF is that with temperature, the % of H2 and CO2 in the syngas increase while the % of CO and CH4 decrease.
Page 7 of the PDF also gives an excellent, detailed diagram of the biomass-to-hydrogen block flow diagram.
The research is from NREL.
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