帽儿山地区山杨次生林林木竞争关系的研究

基于山杨（Poptdus davidianaD．）次生林固定标准地M712、M720的每木检尺数据，采用Hegyi单木竞争指数对帽儿山林场天然山杨次生林的种内、种间竞争强度进行定量分析。研究结果表明：山杨次生林林木所受到的竞争强度随着林木径级的增大而逐渐减小。山杨次生林种内竞争较与伴生树种枫桦的种间竞争弱。山杨次生林种内和种间竞争强度的顺序为：枫桦〉白桦〉蒙古栎〉杏树〉黄菠萝〉山杨〉胡桃楸〉槭树〉榆树〉水曲柳〉椴树〉暴马丁香〉桦树〉花楸〉花曲柳〉色木。

Study on Intraspecific and Interspecific Competition of the Pobuluss davidiana Secondary Forest in Mao'ershan Mountains Area

Based on the tally data of the fixed sampling plot M712 and M720 of Populus davidiana secondary forest, Hegyi competition index of individual tree was used to analyze the intraspecific and interspeeifie competition intensity of natural Populus davidiana secondary forest in Mao＇ershan Mountains Forest Farm quantitatively. The research results showed that the competition intensity of Populus davidiana secondary forest decreased gradually as the diameter classes of forest. The intraspecific competition within the Populus davidiana secondary forest was weaker than the interspeeific competition between Populus davidiana and associated tree species namely Betula castata. The intraspeeifie and interspecific competition intensity of Populus davidiana secondary forest ranked in Betula castata, Betula platyphylla, Quercus mongolica, Prunus armeniaca, PheUodendron amurense, Populus davidiana, Juglans mandshurica, Acer saccharum, Ulmus pumila, Fraxinus mandshurica, Tilia amurensis, Syringa amurensis, Betula, Sorbus pohuashanensis, Fraxinus rhynchophulla, Acer mono.