沈阳农业大学学报2025，Vol.56Issue(2)：83-98,16.DOI:10.3969/j.issn.1000-1700.2025.02.010
辽西北沙地人工林下风沙土的酸度特征及影响因素
Acidity Characteristics and Influencing Factors of the Soil Under Different Plantations in the Sandy Land of Northwestern Liaoning Province
摘要
Abstract
[Objective]The study aims to analyze the acidity characteristics and influencing factors and to assess the acid buffering capacity of the soil under different tree species of mature and overmature plantations in the sandy land of northwestern Liaoning Province.[Method]Mature and overmature plantations of different tree species were selected as research subjects,and various soil physicochemical indexes of different soil layers were analyzed.[Results]The soil pH value gradually increased with the increase of soil depth,and the pH value of broad-leaved forest was higher than that of coniferous forest.The content of soil exchangeable acid,CEC and salt base decreased with the increase of soil depth.The exchangeable acid content was the highest in Pinus tabuliformis plantations,and the lowest in Pinus sylvestris var.mongolica plantations.The CEC value and salt content were the highest in poplar plantations and the lowest in Pinus densiflora plantations.Apart from the Pinus densiflora plantations,the soil acid buffering capacity of different plantations decreased with the deepening of soil layer,and the soil acid sensitivity was mostly gradeⅡ(10 mmol·kg-1)≤pHBC<20 mmol·kg-1),and the soil acid buffering capacity was the highest in poplar plantations,and the lowest in Pinus sylvestris var.mongolica plantations.The influencing factors of pH varied with different soil layer depths.In the 0-10 cm soil layer,it was mainly influenced by organic matter content(P<0.01)and exchangeable acidity and exchangeable salt base(P<0.05);in the 10～20 cm soil layer,it was mainly influenced by exchangeable acidity content and organic matter(P<0.01)and pHBC(P<0.05);in the 20～40 cm soil layer,it was mainly influenced by organic matter content(P<0.01)and pHBC(P<0.05).[Conclusion]After the establishment of plantations,the soil pH value of sandy soil decreased,but the pH of poplar plantations decreased the least,and its soil acid buffering capacity,exchangeable salt base,CEC and BS content were the highest,indicating that the poplar plantations got the strongest overall performance of soil resistance to acidification.In order to reduce the pressure of forest soil acidification,the planting proportion of poplar can be appropriately increased in the future afforestation.关键词
人工林/土壤酸度/交换性酸/交换性盐基/酸缓冲容量Key words
plantation/soil acidity/exchangeable acid/exchangeable salt base/acid buffering capacity分类
林学引用本文复制引用
张学利,吴才都,吕刚,曹怡立..辽西北沙地人工林下风沙土的酸度特征及影响因素[J].沈阳农业大学学报,2025,56(2):83-98,16.基金项目
国家自然科学基金项目(32371968) （32371968）
