Returning maize residue not only helps maintain soil fertility but also local soil carbon balance. Although there have studies of maize residue decomposition, seldom focused on combining different parts of maize residue under field and incubation experiments at different temperatures in saline and alkaline soils. We carried out an incubated decomposition experiment of maize residue (15, 25, 35℃) and a field experiment (12 ~ 29℃) by litter bag method within 90 days in a Solonchak. A double exponential model was used to simulate labile C (carbon) and recalcitrant C in decomposition. The correlation showed a closed decomposition relationship (R² > 0.98) for double exponential model. Field and laboratory experiments showed decomposition increased with temperature and followed order leaf (35%~73%) > stem (35%~72%) > root (21%~63%). The decomposition increased rapidly within first 15 days and then slowed. The decomposition rates (day⁻¹) of maize residue were 0.10 ~ 0.16 (labile C) and 0.0005 ~ 0.0015 (recalcitrant C) at field, and 0.05 ~ 0.10 and 0.0001 ~ 0.0014 at lab. The decomposition rate (day⁻¹) of native soil organic C (SOC) labile C (0.05 ~ 0.13) and recalcitrant C (0.0002 ~ 0.0005) changed with temperature, but recalcitrant C changed not (0.98). The decomposition rate of recalcitrant C increased by 180%~1100%, which was higher than that of labile C (50%~80%) with increasing temperature. The Q₁₀ value showed decomposition of maize residue and SOC at 15 ~ 25 °C was larger than that at 25 ~ 35 °C. By adding 1 g maize stem or leaf to field, 0.15 ~ 0.39 g or 0.18 ~ 0.33 g C stored in soil, respectively. In summary, increased temperature significantly accelerated maize residue decomposition by increasing decomposition rate and turning a part of recalcitrant C into labile C. The temperature sensitivity of maize residue and SOC decomposition was higher at 15 ~ 25 °C than at 25 ~ 35 °C. The simulated saline and alkaline soil C stock was 0.1 ~ 1.7 kg ha⁻¹ yr⁻¹ from maize stem and leaf return facing warming.

返还的玉米残渣不仅有助于保持土壤肥力，而且还可以保持局部土壤碳平衡。尽管已经有关于玉米残留物分解的研究，但很少关注于在盐碱土壤中在不同温度下的田间和温育试验下玉米残留物的不同部分的组合。在Solonchak中，我们在90天内通过垃圾袋法进行了玉米残留物（15、25、35℃）的温育分解实验和12〜29℃的田间实验。使用双指数模型来模拟分解过程中不稳定的C（碳）和难分解的C。相关性显示出封闭的分解关系（R ² > 0.98）（对于双指数模型）。野外和实验室实验表明，分解随温度升高而增加，依次为叶片（35％〜73％）>茎（35％〜72％）>根（21％〜63％）。分解在开始的15天内迅速增加，然后减慢。玉米残渣在田间的分解速率（第^-1天）为0.10〜0.16（不稳定的C）和0.0005〜0.0015（顽calc的C），在实验室为0.05〜0.10和0.0001〜0.0014。天然土壤有机碳（SOC）的不稳定碳（0.05〜0.13）和顽固性碳（0.0002〜0.0005）的分解速率（第^-1天）随温度变化，而顽固性C的分解率（0.98）不变。随着温度的升高，顽固C的分解率提高了180％〜1100％，高于不稳定C的分解率（50％〜80％）。Q ₁₀该值表明玉米残渣分解，SOC在15〜25°C时大于25〜35°C。通过向田间添加1 g玉米茎或叶，可将0.15〜0.39 g或0.18〜0.33 g C分别储存在土壤中。总而言之，温度升高通过提高分解速率并将一部分顽固性C转化为不稳定的C来显着促进玉米残渣的分解。在15〜25°C时，玉米残渣和SOC分解的温度敏感性高于25〜35°C。面对气候变暖，玉米茎叶返回的模拟盐和碱土碳储量为0.1〜1.7 kg ha ^-1 yr ^-1。