State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment , Nanjing University , Nanjing 210093 , P.R. China.
Department of Applied Ecology , Saint Petersburg State University , 199178 , Saint Petersburg , Russian Federation.
J Agric Food Chem. 2019 Oct 16;67(41):11322-11330. doi: 10.1021/acs.jafc.9b03323. Epub 2019 Sep 3.
The simultaneous effects of biochar on soil organic matter (SOM, C4) and sweet potato (SP) residue (, C3) mineralization were studied over 180 days via C and C isotopic label partitioning. Upon concomitant SP residue addition, biochar mineralization decreased by 11% of the total added biochar-C. Compared to positive priming effects induced by biochar amendment alone on SOM (0.46 mg C g soil) at 180 days, amendment solely with SP residues induced significantly larger effects (1.5 mg C g soil). Combination biochar and SP residue addition reduced SOM mineralization by 20.5% and increased SP residue mineralization by 10.1%. Biochar addition caused preferential uptake of SP residues over SOM by microbes. Thus, the lower priming effects on SOM and CO emission induced by biochar amendment with or without SP residues compared to that from SP residue addition alone may result in crop residues being partly pyrolyzed to biochar in the cropland.
通过 C 和 C 同位素标记分区，在 180 天内研究了生物炭对土壤有机质（SOM，C4）和甘薯（SP）残留物（C3）矿化的同时影响。当同时添加 SP 残留物时，生物炭矿化减少了添加的总生物炭-C 的 11%。与单独添加生物炭对 SOM （180 天为 0.46mg C g 土壤）引起的正激发效应相比，仅添加 SP 残留物引起的效应明显更大（1.5mg C g 土壤）。生物炭和 SP 残留添加组合减少了 SOM 矿化 20.5%，并增加了 SP 残留矿化 10.1%。生物炭的添加导致微生物对 SP 残留物的优先吸收大于对 SOM 的吸收。因此，与单独添加 SP 残留物相比，生物炭添加或不添加 SP 残留物对 SOM 和 CO 排放的激发作用较低，可能导致农田中部分作物残体热解为生物炭。
