What is the potential for biogas digesters to improve soil carbon sequestration in Sub-Saharan Africa? Comparison with other uses of organic residues
What is the potential for biogas digesters to improve soil carbon sequestration in Sub-Saharan Africa? Comparison with other uses of organic residues
复制标题
沼气池改善撒哈拉以南非洲土壤固碳的潜力有多大？
DOI：
10.1016/j.biombioe.2014.01.056
复制
发表时间：
2014
影响因子：
6
通讯作者：
Pete Smith
中科院分区：
文献类型：
--
作者：
Jo U. Smith;A. Abegaz;R. Matthews;M. Subedi;E. R. Orskov;V. Tumwesige;Pete Smith
利用厌氧消化产生的生物泥浆作为有机肥料，通过向土壤提供有机质，具有增加碳固存的巨大潜力。本文探讨了这种潜力在撒哈拉以南非洲地区相比，其他用途的有机残留物，包括燃烧的热解炉灶和堆肥。对有机残留物处理过程中碳损失的测量表明，在处理过程中有机残留物中碳损失的比例大于厌氧消化的好氧堆肥或热解。有机残留物的稳定性增加的处理，是类似的堆肥和厌氧消化的材料，但更高的热解处理的材料。使用RothC模型的模拟，由基于有机残留物与土壤孵育的参数驱动，表明仅基于可分解性，处理过的有机残留物比未处理的有机残留物螯合更多的碳，尽管观察到稳定性差异，除非生物炭含有高比例的根本不分解的惰性有机材料，通过掺入生物炭的潜在碳螯合作用与堆肥或生物浆的类似。然而，如果还考虑到处理过程中的碳损失，则掺入生物浆仅螯合与有机残留物未经处理时大致相同的碳量。相比之下，结合堆肥和生物炭螯合显着更多的碳比结合未经处理的有机残留物。因此，使用生物泥浆作为有机肥料，从有机残留物中吸收的碳比在热解炉灶或堆肥上燃烧的碳要少。
Using bioslurry from anaerobic digestion as an organic fertilizer has great potential to increase carbon sequestration by supplying organic matter to the soil. This paper examines this potential in Sub-Saharan Africa compared to other uses of organic residues, including burning on pyrolysis cook-stoves and composting. Measurements of loss of carbon on treatment of organic residues indicate that the proportion of carbon lost from organic residue during treatment is greater for anaerobic digestion than for aerobic composting or pyrolysis. The stability of organic residue is increased by treatment, and is similar for composted and anaerobically digested material, but is higher for material treated by pyrolysis. Simulations using the RothC model, driven by parameters based on incubations of the organic residues with soil, suggest that on the basis of decomposability alone, treated organic residues sequester significantly more carbon than untreated organic residues, and despite the differences observed in stability, unless biochar contains a high proportion of inert organic material that does not decompose at all, the potential carbon sequestration by incorporating biochar is similar to that for compost or bioslurry. However, if losses of carbon during treatment are also taken into account, incorporating bioslurry sequesters only approximately the same amount of carbon as if the organic residue had been left untreated. By contrast, incorporating compost and biochar sequesters significantly more carbon than incorporating the untreated organic residue. Therefore using bioslurry as an organic fertilizer sequesters less of the carbon in the soil from organic residue than burning on pyrolysis cook-stoves or composting.
使用 ECOSSE 估算苏格兰土壤碳储量的变化。
影响因子：
1.1
作者：
Smith J
通讯作者：
Smith J