Better understanding of soil water storage and photosynthetic regulation of maize production will be useful to develop a water-saving strategy in rain-fed conditions. Therefore, maize crop was grown under the different cultivation practices for analyzed light and CO2-response curves under various mulching strategies during 2017-2018 years. Six different treatments were used such as the following: PP, ridges and furrows zone covered with plastic film mulching; PS, ridges covered with plastic film and furrows zone with stalk mulching; PN, ridges covered with plastic film and furrows zone without mulching; TP, conventional flat planting with plastic film mulching; TS, conventional flat planting with stalk mulching; and TN, conventional flat planting without mulching. The PP treatment had considerable effects on rainwater collection, improved SWS, and maize productivity than that of TP treatment. Significantly increase of SWS was observed under the PP treatment as a result photosynthetic capacity (An) improved under light and CO2-response curves, apparent quantum efficiency (α), respiration rate, total chlorophyll ab content, and 13C-photosynthates distribution in different organs. Under the PP and TP treatments, the maize might keep a great photosynthetic capacity at the post-flowering stage through improving An, LAI, soluble protein, Rubisco contents, and grain yield. The CO2 and light-response curves were significantly enhanced at the PP treatment due to higher 13C carbon isotope (Δ‰) and Ci/Ca as a result lower bundle sheath to leakiness of CO2 (ɸ) compared with the rest of all treatments. The results suggested that PP cultivation practice was the best water-saving strategy because it reduced bundle sheath leakiness to CO2 (ɸ); as a result there's a significant improvement in soil water storage, LAI, 13C-photosynthates distribution, photosynthetic capacity parameters, and maize production.

中文翻译：

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在半干旱气候下减少束鞘细胞渗漏并提高光合能力和玉米产量的种植模型和覆盖材料策略。

更好地了解土壤储水和玉米生产的光合调节将有助于制定雨养条件下的节水策略。因此，在 2017-2018 年期间，玉米作物在不同的种植方式下种植，以分析不同覆盖策略下的光和 CO2 响应曲线。使用了以下六种不同的处理方法：PP，垄沟区覆盖地膜；PS，垄上覆盖地膜，垄沟区覆盖秸秆；PN，垄上覆地膜，垄沟区未覆盖；TP，常规覆膜平植；TS，秸秆覆盖的常规平植；和 TN，不覆盖的常规平地种植。PP 处理对雨水收集、改善 SWS、和玉米生产力高于 TP 处理。在 PP 处理下观察到 SWS 显着增加，结果光合能力 (An) 在光和 CO2 响应曲线、表观量子效率 (α)、呼吸速率、总叶绿素 ab 含量和 13C-光合产物在不同器官中的分布得到改善. 在PP和TP处理下，玉米可能通过提高An、LAI、可溶性蛋白、Rubisco含量和籽粒产量，在花后阶段保持良好的光合能力。由于 13C 碳同位素 (Δ‰) 和 Ci/Ca 较高，PP 处理的 CO2 和光响应曲线显着增强，因此与所有处理的其余部分相比，束鞘对 CO2 (ɸ) 泄漏的影响较低。结果表明，PP 栽培实践是最好的节水策略，因为它减少了束鞘泄漏到 CO2 (ɸ)；因此，土壤储水量、LAI、13C-光合产物分布、光合能力参数和玉米产量都有显着改善。