Conversion of rice-wheat rotation (RWR) to conventional vegetable cultivation, especially vegetable cultivation in plastic sheds, readily causes soil structure degradation, and organic manure is commonly applied to mitigate such degradation. Although many studies have focused on changes in SOC properties or structural soil parameters, additional details about the changes, such as the relationships between SOC fractions and soil aggregates during unique land-use changes, are unknown. Here, we studied the changes in soil aggregation, and SOC parameters in 14-year-old plastic-shed vegetable fields (PVFs) and open-air vegetable fields (OVFs) covered with organic manure, with adjacent RWR fields serving as a control. The vegetable fields were converted from RWR fields. SOC fractions were analyzed by using ¹³C solid-state NMR spectroscopy, and the aggregate classes were divided as follows: large macro-aggregates (>2 mm), small macro-aggregates (2–0.25 mm), micro-aggregates (0.25–0.053 mm), and silt and clay particles (<0.053 mm). PVFs had higher SOC and MBC than OVFs and RWR fields. In terms of the SOC fractions, the proportion of O-alkyl C decreased as RWR (53.90%) > PVF (43.21%) > OVF (35.37%), in contrast to the trends in the carbonyl C and aromatic C fractions. The aggregate-associated C, especially that associated with large macro-aggregates and micro-aggregates, in the PVFs was highest among the treatments. The O-alkyl C fraction in large macro-aggregates decreased in the order RWR (44.67%) > OVF (35.76%) > PVF (32.40%), consistent with the results for micro-aggregates. Furthermore, there was a significant (P ≤ 0.05) positive relationship between macro-aggregates (>0.25 mm) and the active C fractions, in contrast to the relationships with stable fractions. It suggested that plastic-shed cultivation might have a more positive effect than open-air cultivation on soil structure and the carbon stock when large amounts of organic manure are applied; moreover, the SOC quantity and quality affect soil aggregation differently.

将稻麦轮作（RWR）转为常规蔬菜种植，特别是塑料棚蔬菜种植，很容易导致土壤结构退化，通常使用有机肥来缓解这种退化。尽管许多研究都集中在 SOC 特性或结构土壤参数的变化上，但关于这些变化的其他细节，例如在独特的土地利用变化期间 SOC 分数与土壤团聚体之间的关系，尚不清楚。在这里，我们研究了有机肥覆盖的 14 年生塑料棚菜地 (PVF) 和露天菜地 (OVF) 的土壤聚集和 SOC 参数的变化，相邻的 RWR 田用作对照。菜地是从 RWR 地转化而来的。通过使用¹³C 固态核磁共振光谱和聚集体类别划分如下：大的大聚集体（> 2 mm），小的大聚集体（2-0.25 mm），微聚集体（0.25-0.053 mm），以及淤泥和粘土颗粒（<0.053 毫米）。PVF 具有比 OVF 和 RWR 场更高的 SOC 和 MBC。就 SOC 组分而言，O-烷基 C 的比例随着 RWR (53.90%) > PVF (43.21%) > OVF (35.37%) 而下降，与羰基 C 和芳族 C 组分的趋势相反。PVF中与聚集体相关的C，特别是与大型宏观聚集体和微观聚集体相关的C在处理中最高。大型团聚体中的 O-烷基 C 分数以 RWR (44.67%) > OVF (35.76%) > PVF (32.40%) 的顺序降低，与微团聚体的结果一致。此外，有显着性（P≤0。05) 宏观聚集体 (>0.25 mm) 和活性 C 部分之间的正相关关系，与稳定部分的关系相反。这表明，当大量施用有机肥时，塑料棚栽培可能比露天栽培对土壤结构和碳储量产生更积极的影响；此外，SOC数量和质量对土壤团聚的影响不同。