[Effects of combined nitrogen and phosphorus addition on fine root traits of young forest].

Both nitrogen (N) and phosphorus (P) are the main limiting elements for plant growth in terrestrial ecosystems. Fine roots play a critical role in plant growth. To reveal the effects of combined N and P addition on fine root traits of , we performed a field N and P addition experiment in the midmonth from April to September in 2016 and 2017 in a 3-year forest (N and P supply ratios were 8:1, 10:1, 12:1, 15:1).