中国农业科学2025，Vol.58Issue(20)：4231-4245,15.DOI:10.3864/j.issn.0578-1752.2025.20.015
钙/铝基改良剂对河套灌区盐碱土质量及向日葵产量的影响
Effects of Calcium/Aluminum-Based Amendments on Saline-Alkali Soil Quality and Sunflower Yield in the Hetao Irrigation District
摘要
Abstract
[Objective]This study aimed to investigate the effects of calcium-and/or aluminum-based soil amendments on soil quality and sunflower yield in the Hetao Irrigation District of Inner Mongolia,China,so as to provide a theoretical support and technical guidance for the comprehensive governance of saline-alkali lands in the region.[Method]A two-year(2022-2023)field experiment was conducted in Ordos City,Inner Mongolia,with four treatments:control(CK),calcium-based amendment(Ca-based),aluminum-based amendment(Al-based),and calcium+aluminum-based amendment(Ca+Al-based).The experiment systematically assessed soil salinity indices and nutrient content in the 0-20 cm soil layer,as well as sunflower agronomic traits and grain yield at harvest.The soil quality index(SQI)was constructed using principal component analysis,and structural equation modeling was employed to reveal the effects of the amendments on SQI and sunflower yield.[Result]Compared with CK,all three soil amendments improved the SQI and sunflower yield.Among the treatments,the Ca+Al-based amendment demonstrated the most promising results,specifically reducing soil pH by 0.09-0.24 units and sodium adsorption ratio by 14.3％-24.9％,and increasing soil available phosphorus by 72.7％-147.0％and nitrate nitrogen by 0.6％-89.6％.Consequently,it increased the SQI by 51.0％-58.0％and sunflower seed yield by 30.0％-51.4％compared with CK.The Ca-based treatment was less pronounced,with SQI increasing by 36.3％-51.0％and yield increasing only in 2022(29.3％).Notably,soil electrical conductivity increased by 16.0％-70.4％under the Ca-based and Ca+Al-based treatments,primarily due to an increase in water-soluble Ca2+,Mg2+,and SO42-concentrations,and did not lead to salt damage in plants.In addition,structural equation modeling revealed that the amendments exerted their effects by directly regulating soil salinity and nutrient indices,which indirectly increased SQI and yield.Furthermore,the contribution of soil salinity reduction to yield(79.2％)was greater than that of nutrient improvement(20.8％).[Conclusion]The Ca+Al-based amendment demonstrated a synergistic effect in significantly improving soil quality and sunflower yield,making it a suitable option for further application in the Hetao Irrigation District of Inner Mongolia and similar ecological regions.关键词
脱硫石膏/硫酸铝/土壤改良剂/盐碱地/土壤质量/向日葵/产量Key words
desulfurization gypsum/aluminum sulfate/soil amendment/saline-alkali soil/soil quality/sunflower/yield引用本文复制引用
李明珠,徐立珍,李彦,赵永敢,田荣荣,李然,王淑娟,王伟妮,王婧,刘俊梅,刘嘉,李玉义..钙/铝基改良剂对河套灌区盐碱土质量及向日葵产量的影响[J].中国农业科学,2025,58(20):4231-4245,15.基金项目
国家重点研发计划(2021YFD1900600)、鄂尔多斯市"揭榜挂帅"项目(JBGS-2021-001)、巴彦淖尔市科技计划项目(K202321) （2021YFD1900600）
