偃松—落叶松林火烧迹地早期植被恢复的影响因子研究.doc

Influencing factors on early vegetation restoration in burned area of Pinus pumila – larch forest ZHAO Fengjun1, SHU Lifu1, WANG Mingyu1, LIU Bin1, YANG Lijun2 (1 Key Laboratory of Forest Ecology and Environment, State Forestry Administration; Research Institute of Forest Ecology; Environment and Protection, Chinese Academy of Forestry, Beijing 100091; 2 Research Station, Daxing’anling Forestry Group, Jiagedaqi, 165000.) Resume: Zhao Fengjun, female, 1971, born in Shandong Province, Chinese, Ph. D., research associate; main research is in forest fires. Mobile telephone number: 简历：赵凤君，女，1971，山东省，中国，博士，助理研究员。主要研究领域：森林防火。电话 Abstract: Pinus pumila (Dall.) Regel, a rare conifer and key species in high latitude and high altitude mountains, has an important role in soil and water conservation. This evergreen shrub grows 3–6 m high in P. pumila - larch (Larix gmelini) open forest at altitudes of 800–1200 m in the Greater Kingan Mountain Range (Daxing’an Mountain). Forest fires are major natural hazards to P. pumila - larch forest. The unique ecological role of this community gives important theoretical and practical significance to research on P. pumila - larch forest restoration after fires. Literature concerning factors influencing early vegetation restoration in burned areas in this habitat is sparse. We studied these factors, especially those related to P. pumila seedling establishment. The results showed fires in P. pumila - larch forest usually resulted in severe burns. Typically almost no P. pumila survived after fires. Nearly all ground fuels were consumed. Second growth after fires exhibited low species richness. The dominant tree/shrub seedlings found after fires were birch (Betula platyphylla) and larch, with small number of P. pumila. Other shrub seedlings found were Ledum palustre, Vaccinium vitis-idaea, Betula fruticosa, and Rubus arcticus. The main herb species found were Deyeuxia langsdorffii, and Chamaenerion angustifolium. Importa