Table 5. Change of importance percentage of the Pinus rigida community in Mt. Cheongryang, Incheon
(Unit: 1,200m2)

Species name 1999 2013 Change Value (%)
C (%) U (%) S (%) M (%) C (%) U (%) S (%) M (%)
Pinus rigida 73.4 30.0 - 46.7 58.1 27.1 - 38.1 -8.6
Pinus densiflora 4.5 7.7 - 4.8 5.9 - - 3.0 -1.8
Betula davurica - 1.0 - 0.3 - - - - -0.3
Alnus hirsuta 4.9 10.4 - 5.9 2.7 1.4 - 1.8 -4.1
Castanea crenata - 1.1 - 0.4 0.6 2.3 3.2 1.6 +1.2
Quercus acutissima 0.5 4.0 0.5 1.7 2.6 1.7 1.2 2.1 +0.4
Quercus variabilis 2.8 3.8 0.9 2.8 1.3 4.4 8.5 3.6 +0.8
Quercus dentata - - - - - - 2.1 0.4 +0.4
Quercus aliena 0.5 - 8.5 1.7 - 0.5 0.4 0.2 -1.5
Quercus mongolica 3.7 8.4 22.8 8.4 5.9 10.0 17.0 9.1 +0.7
Quercus serrata 0.3 4.7 19.7 5.0 1.2 6.5 10.9 4.6 -0.4
Cocculus triobus - - 0.5 0.1 - - 0.3 0.1 -
Lindera obtusiloba - - - - - 1.0 0.4 0.4 +0.4
Spiraea prunifoliafor. simpliciflora - - - - - - 6.0 1.0 +1.0
Sorbus alnifolia 0.6 6.7 3.6 3.1 - 3.3 0.9 1.2 -1.9
Rubus parvifolius - - 0.9 0.2 - - - - -0.2
Rosa multiflora - - 0.6 0.1 - - - - -0.1
Prunus padus - - - - - 1.0 - 0.3 +0.3
Prunus sargentii 6.9 5.6 4.0 6.0 15.8 23.4 4.0 16.4 +10.4
Lespedeza cyrtobotrya - - 1.6 0.3 - - 0.5 0.1 -0.2
Indigofera kirilowii - - 0.5 0.1 - - - - -0.1
Robinia pseudoacacia 2.0 12.1 6.3 6.1 5.9 12.1 8.9 8.5 +2.4
Rhus chinensis - - 0.3 0.1 - - - - -0.1
Rhus trichocarpa - - - - - 0.5 0.4 0.2 +0.2
Euonymus japonica - - - - - - 1.0 0.2 +0.2
Celastrus orbiculatus - - 0.5 0.1 - - - - -0.1
Acer palmatum - - - - - - 0.5 0.1 +0.1
Parthenocissus tricuspidata - - 0.2 - - - - - -
Rhododendron mucronulatum - 2.9 25.4 5.2 - 0.4 17.2 3.0 -2.2
Symplocos chinensisfor. pilosa - - 0.5 0.1 - - 0.3 0.1 -
Styrax japonicus - 0.4 1.6 0.4 - 4.4 7.1 2.7 +2.3
Fraxinus mandshurica - 0.4 - 0.1 - - - - -0.1
Fraxinus rhynchophylla - 0.6 - 0.2 - - - - -0.2
Callicarpa japonica - 0.4 - 0.1 - - 1.5 0.3 +0.2
Smilax china - - 1.2 0.2 - - 4.7 0.8 -0.6
Smilax sieboldii - - - - - - 2.9 0.5 +0.5
C: importance percentage in canopy layer, U: importance percentage in understory layer, S: importance percentage in shrub layer, M: mean importance percentage.