A split plot design was employed with 4 replicates, 2 host species, 8 ectomycorrhizal fungi and 6 or 9 trees per plot (experiment 1), or 3 ectomycorrhizal fungi and 9 trees per plot (experiment 2).

• 试验1有8个外生菌根菌处理，每处理小区6株或9株，试验2有3个外生菌根菌处理，每处理小区9株。