腐殖酸对NaCl胁迫下梭梭种子萌发及幼苗生长的影响

[目的] 探究腐殖酸对NaCl胁迫下梭梭种子萌发及幼苗生长的影响，为干旱矿区生态修复提供技术支持。[方法] 设置5个NaCl盐胁迫浓度，5个腐殖酸添加浓度，观测梭梭种子萌发以及幼苗生长指标，分析腐殖酸对梭梭种子萌发及其幼苗生长的耐盐性。[结果] 施用适量腐殖酸能显著提高种子萌发率，缓解梭梭种子萌发过程中的盐胁迫，促进初生根生长，降低盐胁迫对幼苗的伤害。在1.0 mol/L NaCl条件下，腐殖酸为700 mg/kg时缓解效果最好，与对照相比梭梭发芽率、发芽势、根长、幼根鲜质量和幼根干质量分别提高10%，11.12%，1.77 cm，4.84 mg和4.03 mg。[结论] 腐殖酸可作为干旱矿区生态修复中种子萌发和幼苗生长的一种盐渍土调节剂，具有较好的应用潜力。

Effects of Humic Acid on Seed Germination and Seedling Growth of Haloxylon Ammodendron Under NaCl Stress

[Objective] The effects of humic acid on seed germination and seedling growth of Haloxylon ammodendron seeds under NaCl stress were studied in order to provide technical supports for ecological restoration in arid mining areas. [Methods] Germination and seedling growth of Haloxylon ammodendron seeds were measured under five NaCl stress concentrations and five humic acid additions. [Results] Application of humic acid at appropriate levels significantly increased seed germination rate, alleviated salt stress during the seed germination, increased the growth of primary roots, and reduced seedling damage caused by salt stress. Under 1.0 mol/L NaCl, humic acid at 700 mg/kg produced the best alleviating effect. For this treatment, germination rate, germination potential, root length, fresh mass of young roots, and dry mass of young roots were 10%, 11.12%, 1.77 cm, 4.84 mg, and 4.03 mg, respectively, greater than observed for the control treatment. [Conclusion] Humic acid can be used as a regulator of seed germination and seedling growth in the ecological restoration of arid mining areas. Humic acid has good potential for use as a regulator of saline soils in arid mining areas.