Differences in soil organic carbon (SOC) and total nitrogen (TN) between broadleaved and coniferous forests are not well‐defined, hindering the evaluation of the influence of forest‐type on land degradation and development. For these two foresttypes, we determined differences in soil aggregation, SOC, and TN by comparing 202 plots at six sites with 14 common afforestation tree species. Bulk soil was separated to macroaggregates (0.25–2 mm), microaggregates (0.053–0.25 mm), and silt and clay fractions (<0.053 mm). Inter‐site variations were excluded by MANOVA (multiple analysis of variance) and MANCOVA (multiple analysis of covariance). Broadleaved forests exhibited 30–50% higher SOC and TN in bulk soils than that of coniferous forests, and aggregates contributed to 75–77% of the SOC and TN accrual. The high accrual was a result of SOC and TN concentration increases in aggregates (30–50%), macroaggregates fraction increases (50%, with a 14% decrease in the non‐aggregate fractions), aggregates diameter increases (one‐third), and non‐significant differences in C/N. Uncertainty tests showed a low bias (4.2%), and the accrual of SOC and TN in broadleaved forests were larger at sites with less clay and at higher altitude and more precipitation and afforested with more fraxinus and less poplar. Our results highlight that SOC and TN accrual in broadleaved forests is mainly due to the stronger aggregates protection, which should be fully considered during precise land evaluation and species selection for afforestation. Future studies identifying the mechanisms underlying these changes should consider interactions among leaf functional traits, aggregation‐disaggregation processes, and microbial rhizosphere deposition.

中文翻译：

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与东北地区针叶林的土壤聚集相比，阔叶林的矿物质土壤有机碳和氮的累积：跨站点和多物种比较

阔叶和针叶林之间土壤有机碳（SOC）和总氮（TN）的差异没有明确定义，这妨碍了评估森林类型对土地退化和发展的影响。对于这两种森林类型，我们通过比较6个地点的202个样地和14种常见的造林树种，确定了土壤聚集，SOC和TN的差异。散装的土壤被分离为大团聚体（0.25–2 mm），微团聚体（0.053–0.25 mm）以及淤泥和粘土级分（<0.053 mm）。MANOVA（方差多重分析）和MANCOVA（协方差多重分析）排除了站点间差异。阔叶林在松散土壤中的土壤有机碳和总氮比针叶林高30–50％，而聚集体占土壤有机碳和总氮的75–77％。较高的应计成本是由于骨料中的SOC和TN浓度增加（30–50％），大骨料级分增加（50％，非骨料级分减少14％），骨料直径增加（三分之一）， C / N差异不明显。不确定性测试显示偏倚较低（4.2％），并且阔叶林中的SOC和TN累积在黏土少，海拔高，降水多，造林较多的白蜡木和杨树较少的地方更大。我们的结果表明，阔叶林中SOC和TN的累积主要是由于较强的集料保护，在精确的土地评估和造林树种选择中应充分考虑这一点。未来研究确定这些变化的潜在机制应考虑叶片功能性状之间的相互作用，