| Abstract: | Basing on the detrended corespendenee analysis (DCA) , twb-way indicative species analysis (TWINSPAN) and environmental interpretation mathematical models and warm temperate deciduous-broad leaf forest community samples collected from Dongling mountain in Beijing, primary vegetation types and ecological gradients, and their quantitative relations with environmental factors of the region were studied. The data from 26 climate stations in this region were used to get the multivarient regression for estimating the climate information of various warm temperate deciduous-broad leaf forest according to longitude, latitude and altitude of each sample plot. It is shown that the vegetation types of warm temperate deciduous-broad leaf forest and their distribution are mainly determined by the thermal and moisture ( include soil fertility) gradients. In moisture gradients, in mid-montane from drier to moisture there are Spiraea trilobata shrubland-Vitex negundo shrubland-Prunus sibirica shrubland -manmade Pinus tabulaeformis forest-Quercus liaotungensis forest -mixed deciduous-broad leaf forest- Betula dahurica forest; In subalpine from drier to moisture there are meadow-Caragana jubata shrubland-Betula costata forest. In thermal gradients, from warm to cold there are manmade Pinus tabulaeformis forest-Virex negundo shrubland–Quercus liaotungensis forest -Betula dahurica forest-mixed deciduous-broad leaf forest -Spiraea trilobata shrubland -Prunus siberica shrubland -manmade Larix princips forest-Betula platyphylla forest - B. costata forest-subalpine meadow -Caragana jubata shrubiand . Vegetation of Dongling mountain exists 4 polars anal 2 centers, 4 polars are subalpine Caragana jubata shrubland ( drier and cold habitat), mid-low montane Virex negundo shrubland (drier and warm habitat), subalpine B. costata forest (moisture and cold habitat) and mid-montane B. dahurica forest (moisture and warm). Two centers are Quercus liaotungensis forest and mixed deciduous-broad leaf forest (actuality) , and subalpine coniferous forest (the spruce and larch forest, is the potential center). The dominant and indicative plant species are Aconitum sinomontanurn (cold and moisture), Poa botryoides , Dendrantherna zavadskii, Aconiturn kusnezoffii and Carex rigescencs (cold and drier), Maianthemurn bi foliurn and Corylus rnandshurica (warm and moisture) Spiraea trilobata and Prunus siberica (warm and drier). And these species could be indication species for succession, its would indicate the state of pioneer communities. The Plant-geographic mathematical model of DCA axles (1 and 2) and environment factors (climate and soil) have been set up. |
