樟子松人工林细根生产、周转和碳归还对施氮的响应

• Published in: Beijing da xue xue bao Vol. 54; no. 4; pp. 828 - 838
• Main Authors: Zhang, Jiangyong, Wang, Wei, Zeng, Hui
• Format: Journal Article
• Language: Chinese
• Published: Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 20.07.2018; 北京大学深圳研究生院城市规划与设计学院,深圳518055%北京大学城市与环境学院生态学系,北京,100871; 北京大学城市与环境学院生态学系,北京100871
• Subjects: Biomass; Carbon; Fertilization; Nitrogen; Productivity; Soil pH; 氮浓度; 生产力; 细根; 周转率; 土壤深度
• ISSN: 0479-8023
• DOI: 10.13209/j.0479-8023.2018.002

A N addition experiment was established with four treatments: control (no fertilization), low-N (20 kgN/(hm2.a)), medium-N (50 kgN/(hm2.a)) and high-N fertilization (100 kgN/(hm2.a)) in an N-limited Pinus sylvestris forest in Hebei Province, North China to study the production, biomass and turnover of fine root systematically. The results showed that fine root productivity (NPPfr) increased in low-N plots, decreased in high- N treatment, while the proportion of NPPfr to net primary productivity (NPP) reduced in low-N addition and increased in medium-N addition. With the increase of N availability, root biomass decreased, turnover rate increased, and carbon returned to soil decreased at first and increased later. The influence of N availability on NPPfr didn't change with depth, while turnover rate varied among depth. N-addition made an impact on fine root productivity through soil nitrogen content, soil carbon content and soil pH, while affecting turnover rate of fine root by root carbon and nitrogen content.