脱硫石膏与聚谷氨酸配施对盐碱化土壤的改良效果. (Chinese)

[Objective] The effects of desulfurized gypsum and polyglutamic acid（γ-PGA) improves saline soil were studied in order to provide a theoretical and technical basis for improving saline soil in Northwest China. [Methods] Simulated leaching tests in soil columns and simulated growth tests in pots were used to determine the effect of combining desulfurized gypsum with γ-PGA on saline soils from the perspectives of promoting salt leaching, reducing soil salinity, lowering soil pH value, improving soil nutrient status, and promoting crop growth. [Results] The leaching tests showed that combining desulfurized gypsum with γ-PGA could further reduce soil pH value after leaching and increase Na+ leaching; reduce HCO -3 and Cl- contents after leaching, but increase SO 4 2- , Ca 2+, and Mg 2+ contents; and effectively reduce the sodium adsorption ratio（SAR) value of the soil. Desulfurized gypsum combined with γ-PGA significantly increased maize height, leaf area, and dry weight, with maximum dry weight at 30 days of growth increasing by 54.40% compared with the control treatment, and by 40.27% and 29.47% compared with desulfurized gypsum and γ-PGA treatments alone, respectively. In addition, soil pH value was lower and soil N, P, and K nutrient contents and soil enzyme activities were higher after the plants were harvested from the combined desulfurized gypsum and γ-PGA treatment. [Conclusion] The application of desulfurized gypsum and γ-PGA can produce complementary and synergistic effects, thereby further promoting soil ion exchange, lowering pH value, increasing soil nutrient content, and promoting crop growth. [ABSTRACT FROM AUTHOR]

[目的]探究脱硫石膏与聚谷氨酸(γ-PGA)配施对盐碱化土壤的改良效果,为改良西北地区盐碱 化土壤提供理论和技术依据。[方法]通过土柱模拟淋溶试验和盆栽模拟生长试验,从促进盐分淋洗,降低 土壤含盐量,降低土壤pH 值,改善土壤养分状况,促进作物生长的角度对脱硫石膏和 γ-PGA 配合施用对 盐碱地的改良效果进行研究。[结果]脱硫石膏与γ-PGA 配施能进一步降低淋后土壤的pH 值,提高 Na+ 淋洗;可降低淋洗后 HCO 3 和 Cl- 的含量,但提高淋洗后土壤 SO 2 - 4,Ca 2+ 和 Mg 2+ 含量;有效降低淋后土 壤钠吸附比(SAR)值。盆栽试验表明脱硫石膏与 γ-PGA 配施可显著增加玉米的株高、叶面积和干重,其 中生长30d时该处理玉米干重达到最大值,较对照处理增加了54.40%,较单施脱硫石膏和γ-PGA 处理分 别增加了40.27%和29.47%。此外,脱硫石膏与γ-PGA 配施植株收获后土壤的pH 值更低,且土壤 N,P, K 养分含量和土壤酶活性更高。[结论]脱硫石膏和γ-PGA 配施能起到较好的互补增效作用,进一步促进 了土壤离子交换,降低了pH 值,提高了土壤养分含量,促进了作物生长。 [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)