TAILIEUCHUNG - Environmental Impact of Biofuels Part 6

Tham khảo tài liệu 'environmental impact of biofuels part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 92 Environmental Impact of Biofuels that belowground biomass is more important for c sequestration than aboveground biomass as studies showed that changes in soc pools positively correlated with the quantity of belowground biomass input but not with input of aboveground biomass Russell et al. 2009 Lu et al. 2011 . Balesdent and Balabane 1996 measured root-derived c in maize cultivated soils and found that although the shoot to root ratio was only root-derived c was times higher than aboveground-derived c from stalks and leaves . Furthermore root litter of grasses is of lower quality and therefore less easily decomposable compared to aboveground litter due to lower N but higher lignin concentration Vivanco and Austin 2006 . This higher recalcitrance of plant litter slows down the litter decay process and increases the amount of c stored in the soil Sartori et al. 2006 Johnson et al. 2007 . Biofuel feedstock harvest and global change The sustainability of biofuel feedstock harvest under global change needs to be evaluated in order to quantify changes in the net ecosystem c balance as well as assess a possible positive feedback to climate change. Biofuel feedstock harvest and the coherent changes in the c balance can be evaluated from experimental studies that use clipping or biomass harvesting to remove aboveground biomass Luo et al. 2009 . One study that combined the effects of climate warming and biomass feedstock harvesting on ecosystem c dynamics was conducted in the Southern Great Plains USA which is considered to be a major region for biofuel feedstock production Luo et al. 2009 . Temperatures were increased by 2 c and biomass was clipped annually. On average data of nine years showed increased net primary productivity NPP under warming and even higher values in the combination treatment of warming and clipping. Although warming increased soil respiration rates clipping showed a decreasing trend in soil respiration. Yearly biomass removal reduced .

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