共 45 条
[31]
RAPP M, 1969, OECOLOG PLANTAR, V4, P71
[32]
REIGNER IC, 1964, USFS20 NE FOR EXP ST
[33]
ROTHACHER JACK, 1963, FOREST SCI, V9, P423
[35]
SKAU CM, 1963, FOR SCI, V10, P283
[36]
SNEDECOR GW, 1956, STATISTICAL METHODS
[37]
Storey H. C, 1943, TRANS AMER GEOPHYS UNION, V24, P133
[38]
STUART GW, 1962, THESIS PENNSYLVANIA
[40]
TARRANT RF, 1968, PNW54 USDA FOR SERV