Succulent xerophytes (SX) and less succulent xerophytes (LSX) are able to accumulate inorganic ions and synthesize organic solutes (OS) to adapt to drought stress. Silicon (Si) is one of the five beneficial elements for plants and its importance to SX has been confirmed. In the study, the features of main osmolytes and Si were studied in SX and LSX species, and the coupling effects of inorganic ions were investigated in the SX H. ammodendron and LSX C. korshinskii. Results showed that SX and LSX had the common adaptive characteristic of preferentially accumulating inorganic ions rather than OS for drought resistance, and the total amount of osmotica in SX was 2.36‐times higher than that in the LSX. The greatest contribution to drought resistance was K⁺ (29.7%), the lowest was Na⁺ (2.4%) in LSX, while the greatest contribution was Na⁺ (41.7%), the total OS was the lowest (2.4%) in SX. The coupling effects of inorganic ions played vital important roles in drought resistance of the SX and LSX. The better coupling ratios of NaCl, NH₄NO₃, CaCl₂, MgCl₂ and Na₂SiO₃ in H. ammodendron were 20:5:20:40:10 and 40:10:60:10:7.5 (g kg⁻¹ dry soil), and the better coupling ratios of KNO₃, CaCl₂, MgCl₂ and K₂SiO₃ in C. korshinskii were 20:10:20:10 and 40:20:60:5 (g kg⁻¹ dry soil). Findings suggested that the rational coupling of inorganic ions can be utilized as mineral compound fertilizers to restore and reconstruct degraded vegetations in semiarid areas.

中文翻译：

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西北沙漠地区主要渗透质，硅的特征及其在提高典型旱生植物抗旱性中的耦合效应

多肉干植物（SX）和少肉干植物（LSX）能够积累无机离子并合成有机溶质（OS）以适应干旱胁迫。硅（Si）是植物的五种有益元素之一，其对SX的重要性已得到证实。在这项研究中，研究了SX和LSX物种中主要渗透物和Si的特征，并在SX H. ammodendron和LSX C. korshinskii中研究了无机离子的耦合作用。结果表明，SX和LSX具有优先积累无机离子而不是OS的抗旱性，其渗透压总量比LSX高2.36倍。抗旱性的最大贡献是钾⁺（29.7％），最低的是LSX中的Na ⁺（2.4％），而最大的贡献是Na ⁺（41.7％），总的OS最低的是SX（2.4％）。无机离子的耦合作用在SX和LSX的抗旱性中起着至关重要的作用。的NaCl的更好的耦合比率，NH ₄ NO ₃，氯化钙₂，氯化镁₂和Na ₂的SiO ₃在梭梭分别为20：5：20：40：10和40：10：60：10：7.5（克公斤^{- 1}干旱土壤），且KNO ₃，CaCl ₂，MgCl ₂和K ₂ SiO _3的偶联比更好。C. korshinskii为20：10：20：10和40：20：60：5（g kg ^-1干燥土壤）。研究结果表明，无机离子的合理耦合可以用作矿物复合肥料，以恢复和重建半干旱地区退化的植被。