Mulched drip irrigation is the primary irrigation technology for cotton (Gossypium hirsutum L.) cultivation in arid and semi-arid regions. In recent years, the increasing amount of residual plastic film (RPF) in mulched cotton fields has posed a more significant threat to soil quality and the sustainability of agricultural production. However, the relationship between different soil RPF amounts and cotton growth, yield, and carbon balance in cotton fields is unclear. In this study, six RPF amounts, namely RPF₀ (0 kg ha^–1), RPF₅ (146.18 kg ha^–1), RPF₁₀ (228.03 kg ha^–1), RPF₁₅ (309.88 kg ha^–1), RPF₂₀ (391.73 kg ha^–1), and RPF₂₅ (473.58 kg ha^–1), were set in a two-year (2020–2021) field experiment to investigate their effects on cotton growth, yield, field CO₂ emissions, and carbon sequestration. Results showed that cotton growth indicators (Plant height, stem diameter, leaf area index, biomass of each organ) at different growth stages and yield indicators (Single boll weight, per plant bolls number, seed cotton yield) were significantly negatively correlated (p < 0.05) with the soil RPF amount. The RPF₂₅ treatment showed yield decreases of up to 33.4% and 43.2% in these two years, respectively, compared with the RPF₀ treatment. Surprisingly, the presence of RPF in soil reduced the rate and cumulative CO₂ emissions from cotton fields during the growth and fallow periods, but carbon sequestration in cotton fields decreased significantly with increasing RPF amounts (15.05%~60.98% in 2020 and 17.38~76.81% in 2021). RPF inhibited cotton root growth, reducing plant biomass accumulation, decreasing seed cotton yield, and weakening cotton fields' carbon sink. When the RPF amount in the soil was less than or equal to 228.03 kg ha^–1, cotton economic benefits and field carbon storage were not unduly weakened. The second-year indicators of cotton fields with the RPF were significantly lower than the first year, and the permanent residue of soil RPF also created a more hostile crop growing environment. We concluded that the RPF amount in fields should be reduced as soon as possible and that more environmentally friendly and carbon-reducing mulching materials should be used instead of plastic film.

覆盖滴灌是干旱和半干旱地区棉花（ Gossypium hirsutum L.）种植的主要灌溉技术。近年来，覆盖棉田的残留塑料薄膜（RPF）数量不断增加，对土壤质量和农业生产的可持续性构成了更为显着的威胁。然而，不同土壤RPF量与棉田棉花生长、产量和碳平衡之间的关系尚不清楚。在这项研究中，六个 RPF 量，即 RPF ₀ (0 kg ha ^–1 )、RPF ₅ (146.18 kg ha ^–1 )、RPF ₁₀ (228.03 kg ha ^–1 )、RPF ₁₅ (309.88 kg ha ^–1 )、RPF₂₀ (391.73 kg ha ^–1 ) 和 RPF ₂₅ (473.58 kg ha ^–1 ) 在为期两年（2020-2021 年）的田间试验中设置，以研究它们对棉花生长、产量、田间 CO ₂排放和碳汇。结果表明，棉花不同生育阶段的生长指标（株高、茎粗、叶面积指数、各器官生物量）与产量指标（单铃重、单株铃数、籽棉产量）呈显着负相关（p  < 0.05) 与土壤 RPF 量。_{与 RPF 0}相比， RPF ₂₅处理这两年的产量分别下降了 33.4% 和 43.2%。治疗。令人惊讶的是，土壤中RPF的存在降低了棉田在生长和休耕期间的速率和累积CO ₂排放，但随着RPF量的增加，棉田的碳固存显着下降（2020年为15.05%~60.98%，2020年为17.38~76.81） 2021 年的百分比）。RPF抑制棉花根系生长，减少植物生物量积累，降低籽棉产量，削弱棉田碳汇。当土壤中 RPF 量小于或等于 228.03 kg ha ^–1，棉花经济效益和田间碳储量没有被过度削弱。使用RPF的棉田第二年指标明显低于第一年，土壤RPF的永久残留也造成了更加恶劣的作物生长环境。我们得出结论，应尽快减少田间的RPF用量，并应使用更环保和减碳的覆盖材料代替塑料薄膜。