共 25 条
[21]
STEARNSSMITH SC, 1986, FOREST SOIL ASS SW O
[22]
Walstad J. D., 1986, Western Journal of Applied Forestry, V1, P69
[23]
WALSTAD JD, 1981, INCREASING FOREST PR, P46
[24]
WARING R H, 1969, Northwest Science, V43, P1