锐齿
1.were examined,the result s are as follows:the average standing crop for sharptooth oak stand at age26,Ar mand pine stand at age24and Chinese pine stand at age24was17.475t/ha in the order of Armand pine>Chinese pine>sharptooth oak stand.
2.Effect of Acorn Burying Depth on Germination, Seedling Emergence and Development of Quercus aliena var. acuteserrata
3.The average nutrient accumulated contents of the litters for the3stands was502.5kg/ha in the order of Chinese pine>Armand pine>sharptooth oak stand.
4.The average percentage contents of N,P,K,Ca and Mg in the litters for the3stands was1.08,0.07,0.37,1.37and0.21respectively. In general,the average fig ure in sharp tooth oak stand was much higher than in Armand pine and Chinese pine stands,but there was no evident difference between that in Armand pine and Chinese pine stands.
5.The natural secondary sharptooth oak stand with the age of 26 in Qinling Mts. including soil layer(0～60cm) totally contained nutrient elements 390.173 9 t/hm 2, among them the soil, arbor, shrub, grass and litter possessed nutrient elements 387.786×10 3, 2 139.225 ,71 971,18.050 and 158.944 kg/hm 2 respectively.
6.The annual nutrient uptake and return of the sharptooth oak,Chinese pine and Armand pine stand were334.4and147.2,195.5and66.9,138.8and80.4kg /ha respectively with difference in the determined elements.
7.There were 495 species,227 genera, and 82 families of vascular plants, including 123 species of arbor, 100 species,of shrubs, 240 species of herbs and 32 species,of strata plants and 15 families 19 genera 19 species of non-vascular bundle plants inchuding 13 species 13 genera 9 familiesof mass and pteridophyte 6 species, 6 genera and 6 families of pteridophyte in the community of Mt.Qingling.
8.Leaves crowded near apex of the trunk, spirally arranged; stipes dark brown, with sharp spines; lamina large, oblong, tripinnate; pinnae 17-20 pairs, alternate, longest one to 60 cm long, the basal one reduced; rachis short-spiny; pinnules 18-20 pairs, sessile or nearly so, lanceolate, to 10 cm long and 2.5 cm wide, divided almost to the costa; segments more or less falcate, toothed.
