Carbon sequestration potential of hydrothermal carbonization char (hydrochar) in two contrasting soils; results of a 1-year field study
Carbon sequestration potential of hydrothermal carbonization char (hydrochar) in two contrasting soils; results of a 1-year field study
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DOI：
10.1007/s00374-014-0980-1
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发表时间：
2015-01-01
影响因子：
6.5
通讯作者：
Gleixner, Gerd
中科院分区：
文献类型：
--
作者：
Malghani, Saadatullah;Jueschke, Elisabeth;Gleixner, Gerd
生物质水热碳化法制备的水热炭是一种简单、廉价、有效的提高土壤碳含量的方法。我们追踪了来自玉米青贮水热炭（Δ C-13的-13 aEuro度）添加到“粗”和“细”质地土壤（Δ C-13的-27 aEuro度的原生土壤C（SOC））在两个种植季节。添加水热炭后，两种土壤的呼吸速率均增加（p < 0.001），这种额外的呼吸大部分来自水热炭C。溶解损失占添加的水热炭C的5%（p < 0.001）。1年后，33 +/-8%的添加水热炭C从两种土壤中损失。剩下的大约三分之二的水热炭的分解率非常低，半衰期估计为19年。此外，与对照组相比，水炭改良的土壤保留了15 +/-4%的天然SOC（负启动）。水热炭对两种土壤上第一茬作物的株高（p < 0.01）和生物量（p < 0.05）有负面影响，但对第二茬作物没有影响。我们的研究结果证实了以前的实验室研究表明，最初，水热炭分解迅速，并限制植物生长。然而，负启动效应和持久性添加水热炭碳1年后突出其土壤固碳潜力，至少在十年的时间尺度。
Soil amendment with hydrochar produced by hydrothermal carbonization of biomass is suggested as a simple, cheap, and effective method for increasing soil C. We traced C derived from corn silage hydrochar (delta C-13 of -13 aEuro degrees) added to "coarse" and "fine" textured soils (delta C-13 of -27 aEuro degrees for native soil C (SOC)) over two cropping seasons. Respiration rates increased in both soils (p < 0.001) following hydrochar addition, and most of this extra respiration was derived from hydrochar C. Dissolved losses accounted for 5 % of added hydrochar C (p < 0.001). After 1 year, 33 +/- 8 % of the added hydrochar C was lost from both soils. Decomposition rates for the roughly two thirds of hydrochar that remained were very low, with half-life for less estimated at 19 years. In addition, hydrochar-amended soils preserved 15 +/- 4 % more native SOC compared to controls (negative priming). Hydrochar negatively affected plant height (p < 0.01) and biomass (p < 0.05) in the first but not the second crop grown on both soils. Our results confirm previous laboratory studies showing that initially, hydrochar decomposes rapidly and limits plant growth. However, the negative priming effect and persistence of added hydrochar C after 1 year highlight its soil C sequestration potential, at least on decadal timescales.