Abstract Plastic-film mulching in arid fields under drip irrigation has widely been replaced by biodegradable film mulching (BFM) to avoid plastic-film residue pollution. However, existing ET models are not able to accurately represent field evapotranspiration (ET) under BFM due to the disintegration of biodegradable film. Therefore, this study proposed an improved ET model considering BFM (BSW) based on the Shuttleworth-Wallace model (SW), and the performance of the model was compared with those of the SW, Penman-Monteith (PM) and modified Shuttleworth-Wallace models considering plastic-film mulching (MSW). In addition, the models were validated against observed data from a two-year (2018–2019) maize field experiment under high, medium and low drip irrigation with the depths of 30, 22.5, and 15 mm, respectively. The BSW model performed well with a normalized root mean square error (NRMSE), normalized mean absolute error (NMBE) and index of agreement (IA) for ET under different irrigation depths of 0.12, 0.25, and 0.96, respectively, and 0.10, 0.22, and 0.95 for evaporation (E) under different irrigation depths, respectively. During the early growing stage (elongation and tasseling stage), the BSW model obtained MBEs of cumulative ET (MBECET) and cumulative E (MBECE) of 2.1 and 5.6 mm, respectively, similar to those of the MSW model under high irrigation, but with MBECET estimation accuracy improved by 95.3% and 97.7% compared with the SW and PM models, respectively. The BSW model showed further improvements in estimation accuracy during the middle and late growth seasons (filling and maturation stages) with average MBECET and MBECE of 1.5 and 0.8 mm, respectively for both years. In addition, the E/ET under BFM was decreased with increasing of irrigation depth, while E/ET was positively correlated with the disintegrated area of biodegradable film.

中文翻译：

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干旱滴灌田可生物降解地膜覆盖下玉米蒸散及相关过程模拟

摘要 滴灌干旱地区地膜覆盖已广泛被生物可降解地膜覆盖（BFM）所取代，以避免地膜残留污染。然而，由于可生物降解薄膜的分解，现有的 ET 模型无法准确表示 BFM 下的现场蒸散 (ET)。因此，本研究在 Shuttleworth-Wallace 模型（SW）的基础上提出了考虑 BFM（BSW）的改进 ET 模型，并将该模型的性能与 SW、Penman-Monteith（PM）和改进的 Shuttleworth-Wallace 模型进行了性能比较。考虑塑料薄膜覆盖 (MSW) 的模型。此外，根据两年（2018-2019 年）玉米田间试验的观测数据对模型进行了验证，该试验在深度分别为 30、22.5 和 15 毫米的高、中和低滴灌条件下进行。BSW 模型表现良好，不同灌溉深度下 ET 的归一化均方根误差 (NRMSE)、归一化平均绝对误差 (NMBE) 和一致性指数 (IA) 分别为 0.12、0.25 和 0.96，以及 0.10、0.22 , 和 0.95 对于不同灌溉深度下的蒸发 (E)，分别为。在生长早期（伸长和雄蕊阶段），BSW 模型获得的累积 ET (MBECET) 和累积 E (MBECE) 的 MBE 分别为 2.1 和 5.6 mm，与高灌溉下的 MSW 模型相似，但具有与 SW 和 PM 模型相比，MBECET 估计精度分别提高了 95.3% 和 97.7%。BSW 模型显示在生长中期和后期（灌浆和成熟阶段）的估计精度进一步提高，平均 MBECET 和 MBECE 分别为 1.5 和 0.8 mm，分别为两年。此外，BFM下的E/ET随着灌水深度的增加而降低，而E/ET与生物降解膜的崩解面积呈正相关。