微咸水灌溉下微生物菌肥对盐碱土盐离子及枸杞生长的影响
Effect of Microbial Fertiliser on Salt Ions Content and Growth of Lycium barbarum in Saline Soil under Brackish Water Irrigation
目的 为研究微咸水灌溉下微生物菌肥施用量对盐碱土壤盐离子和枸杞生长的影响及揭示土壤盐离子与枸杞生长指标之间的关系。 方法 在河套灌区中度盐碱土上,开展微咸水灌溉条件下不同微生物菌肥施加量(F1:45 kg/hm2;F2:75 kg/hm2;F3:105 kg/hm2;F0:0 kg/hm2)的田间试验。 结果 随着微生物菌肥施用量增加,土壤盐离子质量分数降低,相较F0,F3处理土壤Na+、K+、Cl-在全生育期降幅最显著(p<0.05),平均分别降低49.22%、40.20%、47.80%。随微生物菌肥的增加,枸杞株高、地径、冠幅和新枝生长速率显著增高(p<0.05),其中F2处理最高。在生长敏感期(开花期)F2处理株高的生长速率较F0提高3.27%;株高、冠幅和新枝的生长速率均在春梢生长期达到峰值,而地径的生长速率在果实膨大期达到峰值。F2处理时枸杞产量较F0提高46.33%(p<0.05),肥料偏生产力达0.61 kg/kg。相关性分析表明,土壤Na+、K+和Cl-质量分数与枸杞生长指标呈负相关。 结论 以改善土壤环境并促进枸杞生长为目标,河套灌区微咸水灌溉条件下盐碱土种植枸杞适宜的微生物菌肥施用量推荐75~105 kg/hm2。
Objective To investigate the effects of microbial fertilizer application under brackish water irrigation on salt ion content in saline soil and on the growth of Lycium barbarum, as well as to elucidate the relationship between soil salt ions and Lycium barbarum growth indices. Methods A series of field experiments were conducted on moderately saline soils in the Hetao Irrigation Area. Four different application rates of microbial fertilizer were tested under brackish water irrigation conditions: F1 (45 kg/hm²), F2 (75 kg/hm²), F3 (105 kg/hm²), and F0 (0 kg/hm², as control). Results Soil salt ion levels declined with increased microbial fertilizer application. Notably, compared to F0, the F3 treatment significantly reduced Na⁺, K⁺ and Cl⁻ levels by 49.22%, 40.20%, and 47.80%, respectively, throughout the reproductive period (p<0.05). Additionally, plant height, ground diameter, canopy width, and new branch growth rate in LBP significantly increased with higher microbial fertilizer levels (p<0.05), with the F2 treatment yielding the greatest improvements. During the flowering stage—a period highly sensitive to growth—the plant height growth rate in F2 exceeded that of F0 by 3.27%. In the spring growth period, the growth rates of plant height, canopy width, and new branches all peaked, while the growth rate of ground diameter reached its highest in the fruit expansion stage. The Lycium barbarun yield in the F2 treatment was 46.33% higher than that in F0 (p<0.05), with a fertilizer partial productivity of 0.61 kg/kg. Correlation analysis indicated a negative relationship between soil Na⁺, K⁺ and Cl⁻ concentrations and Lycium barbarum growth parameters. Conclusion In summary, to optimize soil conditions and promote Lycium barbarum growth in saline soils under brackish water irrigation in the Hetao Irrigation District, a microbial fertilizer application rate of 75~105 kg/hm² is recommended.
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国家自然科学基金项目(52069023)
国家自然科学基金项目(52179037)
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