Study On Selection Of Plant Materials For Soil And Water Conservation In Southern Section Of The Taihang Mountain

The Taihang Mountain is a natural barrier for the Huabei Plain. As the long-term human activities and the topographical characteristics of the mountain, the soil and water erosion in the Taihang mountain areas is very serious, which has been a hidden trouble to the ecological safety of the Huabei Plain and Beijing and Tianjin areas. Greening the Taihang Mountain and controlling the soil and water erosion in the area has always been an important part of the ecological forestry construction in China. In this paper, the south middle mountainous area of the Taihang Mountain was taken as an example, the following aspects were studied and analyzed including plant material selection in establishment of water conversation forests, distribution and natural rehabilitation of vegetation community; growth, and water conservation capability of main plant materials; and diversity of plant materials and adapted site conditions, etc. The main research results were listed as follows:The research area belongs to the defoliated broad-leaved forest belt of warm temperate zone with rich vegetation in history, which reflects this area has the water and heat condition for vegetation rehabilitation. In the area, mountainous vegetation of moist and temperate in east of China is the dominant community, which has various natural secondary forests. Mixture forest of Pine and Oak trees( with elevation from 1000m to 1900m),larch and birch mixed forest(with elevation from 1400m to 2300m) and Platycladus orientalis forest (with elevation below 1300m) has been key plots of regional ecological landscape and important germplasm resource bank, which also provides material and models of vegetation rehabilitation. With the development of blocking mountain and raising forest, herb communities become domination during the time of 1-15a, shrub becoming superior communities during the time 20-25a and trees gradually occupying habitat space during the time of 30-50a .Natural rehabilitation is a quite easy and economic measure to recover vegetation.An integrated evaluation on growth potential, preserving rate and resistance of various tree species in afforestation were given in the paper. For instance, Pinus sylvestris var. mongolica, Platycladus orientalis, Sabina chinensis,Juniperus rigida,Sabina vulgaris,Prunus armeniaca var.ansu,Gleditsia heterophylla,Sophora viciifolia,prunus davidiana and Hippophae rhamnoides are suitable for afforestation in the sunny slope. Robinia pseudoacacia,Ailanthus altissima,Ulmus pumila,Rhuus typhina,Pinus bungeana,Amorpha fruticosa,Caragana microphylla,Periploca sepium and Zizyphus ujuba are not good species to grow in rocky and in shallow soil layer of mountainous areas. Elevation as a limited factor exerts influence on the distribution of Larix principis-rupprechtii (>1400m) and Onobrychis viciaefolia(<500m) .North slope with thickness of soil layer within elevation from 1300m to 1700m is suitable for growth of Larix leptolepis, attaining to tree height of 15m for growth of 22a.As...