Comparative Studies on Nitrogen Content of Soil in Different Forest Types of Dahurian Larch Forest
YU Hai-yun, WEI Jiang-sheng, WANG Zhi-jun
ACTA AGRICULTURAE BOREALI-SINICA . 2005, (S1): 77 -80 .  DOI: 10.7668/hbnxb.2005.S1.021