氮磷添加对土壤有机碳的影响: 进展与展望

冯继广, 张秋芳, 袁霞, 朱彪

Effects of nitrogen and phosphorus addition on soil organic carbon: review and prospects

FENG Ji-Guang, ZHANG Qiu-Fang, YUAN Xia, ZHU Biao

表1 土壤有机碳的分组方法及其组分特性

Table 1 Fractionation methods and characteristics of soil organic carbon fractions

粒径分组 Size fractionation 密度分组 Density fractionation 特性 Characteristic 文献 Reference 大团聚体有机碳 Macroaggregate OC (>250 μm) 游离态的轻组分有机碳 Free light-fraction OC 来源于新输入的植物残体, 最容易被微生物分解, 周转速率最快 Originated from newly-inputted plant residues, most easily to be decomposed by microbes, and with the fastest turnover rate Six et al., 2002; Marín-Spiotta et al., 2008 微团聚体有机碳 Microaggregate OC (53-250 μm) 包裹态的轻组分有机碳 Occluded light-fraction OC 来源于半分解的植物残体, 但在团聚体内部受到了物理保护, 较易分解, 周转速率较快 Originated from partly-decomposed plant residues, but physically protected within aggregates, easier to be decomposed, and with a faster turnover rate Trumbore, 1993; von Lützow et al., 2007 黏粉粒/矿物结合态有机碳 Silt-clay/mineral-associated OC (<53 μm) 重组分有机碳 Heavy-fraction OC 与土壤矿物紧密结合, 较难被分解, 周转速率较慢 Closely bound to soil minerals, difficult to be decomposed, and with a slow turnover rate John et al., 2005; Lavallee et al., 2020