Organic amendments are a recyclable resource and can improve soil quality and carbon (C) sequestration, however, the difference in their effects on soil aggregate formation and C sequestration in saline-alkaline soils are less studied. We examined the effects of organic amendments to saline rice paddy fields with 4 treatments: (i) basal paddy soil (CK) lacking amendments (ii) organic fertilizer (OF) treatment at 910 kg C ha⁻¹ from soybean litter and beans (iii) rice straw (RS) treatment at 3600 kg C ha⁻¹ and (iv) rice straw-derived biochar (RS-biochar) treatment at 3600 kg C ha⁻¹. All organic amendments significantly increased the soil organic C (SOC) stock in the 0–30 cm soil layer compared to CK. The SOC stock in the biochar treatment increased by 6.2 and 40.4% over the OF and RS amended treatments, respectively. This was most likely due to the greater levels of aromatic C in RS-biochar at 1.22 and 1.24 times greater than for the other organic amendments, respectively. Soil aggregates of 2–8 mm at 0–15 cm in the OF and RS amended soils were 38.3 and 58.2%, respectively, higher than that from the RS-biochar treatment. The mean weight diameter (MWD) in the OF and RS treatments were 35.4% and 45.8% higher than for the RS-biochar, respectively. MWD was significantly negatively correlated with soil exchangeable Na (p < 0.05). This indicated OF and RS were better than RS-biochar in improving soil aggregate stability. In addition, the C management index values for RS were 21.6 and 45.8% greater than for OF and RS-biochar in the 0–15 cm soil layer, respectively. These data indicated that saline soil aggregate formation and C sequestration improved after organic amendments application, which caused the exchangeable Na to decrease and affected its distribution in aggregates, and changed the composition of C functional groups.

有机改良剂是一种可循环利用的资源，可以改善土壤质量和碳固存，但是，它们在盐碱土中对土壤团聚体形成和碳固存的影响差异却很少。我们用4种处理方法研究了有机改良剂对盐田的影响：（i）缺少改良剂的基础稻田（CK）（ii）在910 kg C ha ^-1下从大豆凋落物和大豆中施用有机肥料（OF）（iii ）稻草（RS）在3600治疗千克碳公顷^-1和（iv）稻草衍生的生物炭（RS-生物炭）处理以3600千克碳公顷^-1。与CK相比，所有有机改良剂均显着增加了0-30 cm土壤层的土壤有机碳（SOC）存量。生物炭处理的SOC量比OF和RS改良处理分别增加了6.2和40.4％。这很可能是由于RS-生物炭中芳烃C的含量分别比其他有机改性剂高1.22和1.24倍。OF和RS改良土壤中0-15 cm处2-8 mm的土壤团聚体分别比RS-生物炭处理高38.3％和58.2％。OF和RS处理的平均体重直径（MWD）分别比RS-生物炭高35.4％和45.8％。MWD与土壤可交换Na（p <0.05）。这表明OF和RS在改善土壤团聚体稳定性方面优于RS-生物炭。此外，在0-15厘米的土壤层中，RS的碳管理指数值分别比OF和RS-生物炭大21.6和45.8％。这些数据表明，施用有机改良剂后盐渍土壤团聚体的形成和碳固存得到改善，这导致可交换性Na减少并影响其在团聚体中的分布，并改变了C官能团的组成。