氮沉降和降水变化对原始阔叶红松林土壤团聚体木质素/N的影响

Lignin/N is utilized as a parameter of carbon capture capability of soil aggregates, which is significant to comprehensive understand the physical mechanism of aggregate carbon capture derived by biological process. The project shared research findings of sample area provided by changbai mountain forest ecosystem research station of Chinese academy of sciences. Content of soil organic carbon, nitrogen and lignin in the soil aggregates with different size were investigated in the above experimental field with and without nitrogen deposition and precipitation change. Lignin turnover in aggregates and the influence of the turnover on the capacity of soil carbon capture under nitrogen deposition and precipitation change will be investigated. The research result of this project will provide scientific basis for the evaluation of carbon capture capability of soil under global change condition.

木质素/N 作为表征土壤团聚体碳截获的参数，对于综合理解生物过程驱动的土壤碳截获的团聚体物理机制具有重要科学意义。本项目，在中国科学院长白山森林生态系统定位研究站“原始阔叶红松林人工增氮和控制降水实验基地”有关凋落物分解和细根周转研究成果基础上，系统研究氮沉降和降水量变化条件下原始阔叶红松林土壤不同粒级团聚体中有机碳、氮和木质素含量变化，探讨氮沉降和降水变化驱动的团聚体木质素的转化及其对碳截获能力的影响，为评估全球变化影响土壤碳截获能力提供科学支持。