With a combination of permanent and temporary sample plots, we investigated the growth conditions of natural poplar-birch forests. The forests were divided into four site classes, using statistical and analytical techniques in a quantitative model, in descending order where site class !` was the best. On this basis, the growth of natural poplar-birch forests in the different site classes was studied. The growth processes of height and diameter at breast height were divided into three stages: a fast growing period, a stable growing period and a slow growing period. Results of this study provide a theoretical basis for the directive cultivation of natural poplar-birch forests.
LAN Shibo, LUO Xu, LUO Yuliang
. The growth process of natural poplar-birch forests[J]. Frontiers of Forestry in China, 2006
, 1(3)
: 277
-284
.
DOI: 10.1007/s11461-006-0012-x