1. 西北农林科技大学, 资源环境学院, 陕西 杨凌,712100
2. 陕西省土地工程建设集团有限责任公司,陕西,西安,710075
3. 安康市汉滨区农业农村局,陕西,安康,725000
4. 西北农林科技大学 水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌,712100
纸质出版:2023
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张灵芝, 李蒙, 李洪义, 等. 脱硫石膏与聚谷氨酸配施对盐碱化土壤的改良效果[J]. 水土保持通报, 2023,43(6):115-125.
Zhang Lingzhi, Li Meng, Li Hongyi, et al. Effects of Desulfurized Gypsum Applied Combined with Polyglutamic Acid on Improving Saline Soil[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 115-125.
张灵芝, 李蒙, 李洪义, 等. 脱硫石膏与聚谷氨酸配施对盐碱化土壤的改良效果[J]. 水土保持通报, 2023,43(6):115-125. DOI: 10.13961/j.cnki.stbctb.2023.06.015.
Zhang Lingzhi, Li Meng, Li Hongyi, et al. Effects of Desulfurized Gypsum Applied Combined with Polyglutamic Acid on Improving Saline Soil[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 115-125. DOI: 10.13961/j.cnki.stbctb.2023.06.015.
[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
4
2-
,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30 d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。
[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 HCO3- and Cl- contents after leaching
but increase SO42-
Ca2+
and Mg2+ 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.
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