土壤与作物2024，Vol.13Issue(3)：255-268,14.DOI:10.11689/sc.2023071102
基于发生层的均腐土理化性质和元素生态化学计量特征分析
Characteristics of physicochemical properties and element ecological stoichiometry in Isohumosols from soil genetic horizons
摘要
Abstract
To clarify the change patterns of physicochemical properties and element ecological stoichiometry of soil profiles,and thus provide a scientific basis for understanding soil formation mechanisms and protecting soil resources,this study collected soil samples from Ustic and Udic Isohumosols in Heilongjiang Province of China based on the genetic horizons,and their physicochemical properties and element ecological stoichiometry were comparatively examined.The results showed that from A-horizon to C-horizon,the soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP),ammonia nitrogen(NH4+-N),available phosphorus(AP)and sand contents,as well as the surface mean diameter(SMD)and volume mean diameter(VMD)of soil particles decrease gradually;while the soil pH,clay and silt contents increase significantly.Notably,greater soil heterogeneities are observed in C-horizons(parent material horizons)than in Ah-horizons(humus horizons),and the variations of the physicochemical properties along soil profiles are greater in Udic Isohumosols compared to Ustic Isohumosols.In addition,the element ecological stoichiometric analysis found that soil C∶N,C∶P and N∶P decrease significantly with increasing soil depth in both Ustic and Udic Isohumosols,suggesting that the nutrient cycling processes in deeper soil horizons are more strongly constrained by carbon and nitrogen.关键词
均腐土/发生层/垂直分布/土壤性质/生态计量比Key words
Isohumosols/genetic horizons/vertical distribution/soil properties/ecological stoichiometry分类
农业科技引用本文复制引用
刘株秀,刘俊杰,焦峰,姚钦,王光华..基于发生层的均腐土理化性质和元素生态化学计量特征分析[J].土壤与作物,2024,13(3):255-268,14.基金项目
国家自然科学基金(41977202) （41977202）
中国科学院战略先导项目(XDA28020201). （XDA28020201）
