The cold resistance of P. nigra var. austriaca, Pseudotsuga menziesii var. glauca and P. tabulaeformis was determined with artifical freezing method and conductometry.

• 摘要对黄土高原丘陵沟壑区引种栽培的奥地利黑松、花旗松和乡土树种油松的针叶进行冰冻后测定其电导率，比较三者间的抗寒性；