%0 Journal Article
%T COMPARISON OF SEEDLING RECRUITMENT AND ESTABLISHMENT OF QUERCUS WUTAISHANICA IN TWO HABITATS IN DONGLING MOUNTAINOUS AREA, BEIJING<br>北京东灵山区两种生境条件下辽东栎幼苗补充与建立的比较
%A GAO Xian_Ming
%A DU Xiao_Jun
%A WANG Zhong_Lei
%A <br>高贤明
%A 杜晓军
%A 王中磊
%J 植物生态学报
%D 2003
%I Editorial Office of Chinese Journal of Plant Ecology
%X In Beijing Dongling Mountainous area, the coppiced populations of Liaodong oak ( Quercus wutaishanica Mayr) usually appear as an associated tree species of the Chinese pine ( Pinus tabulaeformis Carr.) artificial forest. In some places the artificial pine forest is replaced by mixed crops of Chinese pine and Liaodong oak, or the oak takes the place of the pine as the dominant species in some specific habitats along the ridges and the upper slopes of hills. In order to compare and understand the recruitment and establishment of Liaodong oak seedlings under Chinese pine artificial forest as well as the natural regeneration mechanism of the oak forest, an artificial forest of Chinese pine with Liaodong oak as an associated species in Beijing Dongling Mountainous area was selected, and comparative experiments on the recruitment and establishment of seedlings were conducted by sowing the acorns of Liaodong oak about 2 cm below the floor surface in two habitats, under the canopies and along the boundaries of the artificial forest. The results showed that in the mast year of the oak, though the difference of loss of the acorns planted in these two habitats was not significant, yet there were highly significant differences in the recruitment and establishment of seedlings. Since activities of small forest animals, rodents in particular, have both positive and negative effects on oak forest regeneration, through acorn consumption and germination facilitation, close attention was paid to the phenomenon of cotyledon loss of acorns and the consequences of the loss. As the acorns germinated as soon as they fell from the mother tree in autumn, before the seedlings sprouted their caudices, the taproots would have grown 10_20 cm long and formed primary root systems, implying that certain amount of the nutrition stored in the cotyledons had been transported to the roots. From the field experiments it was found that the acorn cotyledons were consumed by the predator in three ways during the early seedling stage: 1) the seedlings lost their cotyledons without harming any other parts, which often occurred along the forest boundaries, accounting for 29.69% of the germinated acorns; 2) the whole seedlings were drawn out of the soil, which almost always happened under the forest canopies, accounting for 62.43%; 3) the stems of seedlings were broken at the bases where the cotyledons are connected, occurring 50.88% along the boundaries, more frequently than under the forest canopies where only 8.41% of germinated acorns occurred. Only the latter two ways caused the seedlings to die, while cotyledon loss after seedling emergence from the soil had little negative effects on the growth and survival of the seedlings. These phenomena might result from different soils between these two habitats; soil along the boundaries has little humus and is much harder and drier than that of the forest floor under the canopy. Also, the taproots were much longer along the boundaries. So whe
%K Quercus wutaishanica
%K Acorn
%K Cotyledon loss
%K Seedling
%K Habitat
%K Recruitment and establishment
%K Dongling Mountainous area<br>北京
%K 东灵山区
%K 生境
%K 辽东栎
%K 幼苗
%K 子叶丢失
%K 坚果
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=2F2173CCFF292BF447DC2681EA33BBAE&aid=6979C880F4B4E230&yid=D43C4A19B2EE3C0A&vid=DB817633AA4F79B9&iid=38B194292C032A66&sid=B79ACB6EBBFC9730&eid=34D9E20AD82A0D72&journal_id=1005-264X&journal_name=植物生态学报&referenced_num=12&reference_num=29