Due to the low quality of water resources in arid and semi-arid regions of the world, selection and management of forage plants suitable for saline condition is of great importance. Intercropping systems with halophyte plants not only improve production efficiency but also reduce soil salinity. In this study, the effects of different levels of irrigation water salinity and intercropping system on physiological indices and biological yield of Kochia, Guar and Sesbania were investigated during the growing seasons of 2016 and 2017. A split plot experiment was conducted in a randomized complete block design with three replications. The main factor was salinity of irrigation water (4, 9 and 14 dS m⁻¹) and the sub-factor was different cropping systems that consisted of mono cropping of Guar, Sesbania or Kochia, intercropping of two species and intercropping of three species. Results showed that salt stress increased sodium in the leaves of Kochia, Guar and Sesbania. Compared to mono cropping of Guar, in intercropping of three species and in intercropping with Kochia, Guar leaf potassium content was increased by 33.3% and 19.9% respectively. Salinity levels of 9 and 14 dS m⁻¹ compared to salinity level of 4 dS m⁻¹ increased the soluble sugar content of Kochia plant by 65.7% and 52.7%, respectively. However, in similar salinity levels, the trend for soluble sugar changes in Guar was vice versa. Salinity treatment of 14 dS m⁻¹ decreased the relative water content of Sasbania and Guar leaves, but had a reverse effect on Kochia. Intercropping of two and three species also increased the relative water content of Sasbania and Guar leaves. Enhancement in salinity stress increased ionic leakage and malondialdehyde content of Guar leaf. On the other hand, at salinity level of 14 dS m⁻¹, intercropping of three species increased the carotenoid content and decreased the amount of Guar leaf malondialdehyde compared to the Guar mono cropping system. The results of this study showed that salinity stress had negative effect on Guar yield but intercropping with Kochia could partly improve the yield of both Guar and Sesbania. In addition Kochia showed relatively good yield potential under salinity stress. Therefore, to improve the production of Sesbian and Guar, and also physiological performance of Kochia, intercropping system of these plants is recommended under salinity stress conditions.

中文翻译：

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在灌溉水的盐分胁迫下，通过套种地肤（Kochia scoparia），地瓜（Sesbania aculeata）和瓜尔豆（Cyamopsistetragonoliba）来改善生理指标和生物产量。

由于世界干旱和半干旱地区的水资源质量低下，因此，选择和管理适于盐分条件的饲草植物非常重要。盐生植物间作系统不仅提高了生产效率，而且降低了土壤盐分。在这项研究中，研究了不同水平的灌溉水盐分和间作系统对2016年和2017年生长期的地肤，瓜尔和塞斯巴尼亚的生理指标和生物产量的影响。设计具有三个副本。主要因素是灌溉水的盐度（4、9和14 dS m ^-1），而次要因素是不同的耕作制度，包括瓜尔，塞斯巴尼亚或科基亚的单季种植，两种间作和三种间作。结果表明，盐胁迫增加了地肤，瓜尔和塞巴尼亚叶片的钠含量。与瓜尔豆单作相比，在三种树种间作和与地肤的间作中，瓜尔豆叶片钾含量分别增加了33.3％和19.9％。盐度水平为4 dS m ^-1的9和14 dS m ^-1的盐度分别使柯氏植物的可溶性糖含量分别增加了65.7％和52.7％。但是，在相似的盐度水平下，瓜尔豆中可溶性糖变化的趋势反之亦然。14 dS m ^-1的盐度处理降低了Sasbania和瓜尔叶的相对含水量，但对地肤有相反的影响。间作的两个和三个物种也增加了Sasbania和瓜尔叶的相对含水量。盐度胁迫的增强增加了瓜尔叶的离子泄漏和丙二醛含量。另一方面，在盐度水平为14 dS m ^-1时与瓜尔单作系统相比，三种作物间作增加了类胡萝卜素含量，并减少了瓜尔叶丙二醛含量。这项研究的结果表明，盐分胁迫对瓜尔豆产量有负面影响，但与高地棉间作可以部分提高瓜尔豆和塞巴尼亚的产量。此外，在盐分胁迫下，地肤表现出相对较好的单产潜力。因此，为了提高芝麻和瓜尔豆的产量以及地肤的生理性能，建议在盐分胁迫条件下对这些植物进行间作系统。