Abstract:

The stand structure characteristics of secondary forests of Quercus liaotungensis on Xiaolongshan was analyzed using spatial structure and non-spatial structure indictors such as mingling, uniform angle index, neighborhood comparison, diameter distribution, layer number and species diversity. The results showed that the species number of shrub layer and the herb layer was abundant and the species diversity was high. The species diversity index of the arbor layer was significantly lower than shrub layer and herb layer. Feature of the stand diameter distribution was typical uneven-aged forest character. The stand natural regeneration was good and the number of Q.liaotungensis seedlings accounted for 46% of the total number of seedlings. The stand mean angle index was 0.541, and the pattern of individual tree horizontal distribution was cluster distribution. The species segregation was high and the average value of mingling was 0.71. Approximate 77.4% individual trees was medium mingling and 24% individual tree was intensive mingling in stands. The order of tree species neighborhood comparison compared with breast height diameter was as follow: Quercus aliena var. acuteserrata, Q.liaotungensis,Rhus verniciflus , Cornus controversa, Pinus armandi, Acer davidii, Lindera obtusiloba,Tilia tuan, Fraxinus paxiana, Crnus macrophylla. The stand average layer number was 2.45 on vertical structures and the layer was clearly differentiated. Some management advices are proposed according to the regeneration and structure characters of the forests.

Key words: Quercus liaotungensis, secondary forests, diversity, structure characteristics, Xiaolongshan