生态学杂志2024，Vol.43Issue(9)：2641-2649,9.DOI:10.13292/j.1000-4890.202409.024
凋落物管理对杉木林土壤有机碳化学结构和热稳定性的影响
Effects of litter management on chemical structure and thermal stability of soil organic carbon in a Chinese fir forest
摘要
Abstract
Soil organic carbon(SOC)is closely related to forest land maintenance and carbon sink function.Small fluctuations in soil SOC can cause significant changes in atmospheric CO2 concentrations.As a main management measure of plantation,how and why litter management affects the chemical structure and stability of SOC remains unclear.In this study,a field control experiment was conducted in a Chinese fir(Cunninghamia lanceolata)forest with three treatments,namely,litter addition,litter removal and control,following a completely randomized block design.After 6 years of treatment,soil samples from three layers(0-10 cm,10-20 cm,and 20-40 cm)were col-lected,and the chemical structure of SOC was determined by transmission Fourier-transform infrared spectroscopy(T-FTIR).The thermal stability of SOC was analyzed by thermogravimetry(TG)and differential scanning calorim-etry(DSC),and the soil physicochemical properties were determined.The results showed that(1)Litter removal significantly decreased NH4+-N concentration in the 0-10 and 20-40 cm layers and NO3--N concentration in the 10-20 cm layer;(2)Litter addition significantly decreased the relative proportion of alcohols and phenols in SOC and increased the relative proportion of aromatics;(3)Litter addition significantly decreased the thermal stability coefficient(H),and litter removal treatment significantly increased the temperature corresponding to 50％mass loss during SOC combustion(Tg-T50);(4)The NH4+-N and NO3--N concentrations were significantly negatively correlated with Tg-T50.Alcohol phenols and aromatic groups were positively and negatively correlated with H,re-spectively.In summary,litter removal improved the thermal stability of SOC by decreasing N effectiveness,while litter addition improved thermal stability of SOC by decreasing the readily decomposable carbon and increasing the formation of refractory carbon in the chemical molecular structure of SOC.Our results can provide a scientific basis for subtropical plantation to achieve"carbon neutrality"by improving soil carbon sink function through litter man-agement.关键词
凋落物输入/杉木人工林/土壤有机碳/透射傅里叶红外光谱法/差示扫描量热法Key words
litter input/Chinese fir plantation/soil organic carbon/transmission Fourier-transform infrared spec-troscopy(T-FTIR)/differential scanning calorimetry(DSC)引用本文复制引用
陈春宇,陈伏生,郑志宇,彭亦童,刘俏,王晟楠,王方超..凋落物管理对杉木林土壤有机碳化学结构和热稳定性的影响[J].生态学杂志,2024,43(9):2641-2649,9.基金项目
国家自然科学基金(32171759,31930070,32201533)和江西省林业科技创新项目(创新专项[2022]1号)资助. （32171759,31930070,32201533）
