Biochar mineralization and priming effect on SOM decomposition in two European short rotation coppices
Biochar mineralization and priming effect on SOM decomposition in two European short rotation coppices
复制标题
DOI：
10.1111/gcbb.12219
复制
发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
M. Ventura;G. Alberti;M. Viger;J. R. Jenkins;C. Girardin;S. Baronti;A. Zaldei;G. Taylor;C. Rumpe
中科院分区：
文献类型：
--
作者：
M. Ventura;G. Alberti;M. Viger;J. R. Jenkins;C. Girardin;S. Baronti;A. Zaldei;G. Taylor;C. Rumpe
由于在田间条件下对生物炭稳定性的研究非常少，生物炭应用于农业土壤的固碳潜力仍然不确定。本研究通过连续土壤呼吸监测和周期性同位素(δ13CO2)测定，评价了两个短轮伐期草丛系统(意大利和英国)中生物炭在田间条件下的稳定性、植物根系对生物炭稳定性的影响以及生物炭对土壤原始有机质分解的影响。当排除根生长时，在意大利和英国，分别在245天和164天后，添加的生物炭碳只有7%和3%被分解。在有根存在的情况下，这一比例分别增加到9%和8%，表明根对生物炭的分解具有较小的正启动作用。生物炭掺入后，两个部位的原生有机质分解速率均有所降低，表明生物炭对有机质具有保护作用。这项研究支持了生物炭的固碳潜力，并强调了根系活动在生物炭分解中的作用，质疑了实验室培养研究评估生物炭稳定性的适用性。
As studies on biochar stability in field conditions are very scarce, the carbon sequestration potential of biochar application to agricultural soils remains uncertain. This study assessed the stability of biochar in field conditions, the effect of plant roots on biochar stability and the effect of biochar on original soil organic matter (SOM) decomposition in two (Italy and United Kingdom) short rotation coppice systems (SRCs), using continuous soil respiration monitoring and periodic isotopic (δ13CO2) measurements. When root growth was excluded, only 7% and 3% of the biochar carbon added was decomposed after 245 and 164 days in Italy and United Kingdom sites respectively. In the presence of roots, this percentage was increased to 9% and 8%, suggesting a small positive priming effect of roots on biochar decomposition. A decreased decomposition rate of original SOM was observed at both sites after biochar incorporation, suggesting a protective effect of biochar on SOM. This study supports the carbon sequestration potential of biochar and highlights the role of root activity on biochar decomposition, questioning the applicability of laboratory incubation studies to assess biochar stability.