黄土高原马栏林区主要乔木种更新研究  

Studies on Regeneration of Major Tree in Malan Forest Region on the Loess Plateau

作　　者：田丽[1] 王孝安[2] 

机构地区：[1]陕西榆林学院生命科学学院,陕西榆林719000 [2]陕西师范大学生命科学学院,西安710062

出　　处：《中国农学通报》2009年第7期97-102,共6页Chinese Agricultural Science Bulletin

基　　金：国家重大基础研究规划项目(973项目)"西部典型区域森林植被对农业生态环境的调控机理"的子课题"生态用水与森林植被定向恢复调控"(2002CB111505-1)。

摘　　要：对黄土高原马栏林区以辽东栎(Quercus liaotungensis)和油松(Pinus tabulaeformis)为优势种的森林群落中5种主要乔木的幼苗和幼树种群进行统计学研究。结果表明:辽东栎、茶条槭(Acer ginnala)和葛萝槭(Acer grosseri)的幼苗和幼树在林冠层下占优势,具有较高的密度和出现频率。油松和漆树(Taxicodendron vernicifluum)幼苗虽较多,但幼树数量却较少。辽东栎逆J字型大小级结构表明其幼苗和幼树库的持续存在和较好的更新;辽东栎幼苗倾向于在林窗下出现,说明林窗可能有利于该种的更新;表明辽东栎种群林冠下幼苗库的更新和林窗更新对于维持该种群的稳定都具有较重要的作用。茶条槭和葛萝槭幼苗和幼树耐荫的生态学特性,使其倾向于占据林冠下层,说明茶条槭和葛萝槭林冠下充足的幼苗和幼树库是其更新的主要策略之一。从更新策略的角度来讲,更新生态位的差异可能是物种共存的原因,当然也包括其他的影响因素比如幼苗和幼树不同的生态学特性等。The demography of seedling and sapling communities （dominant species： Quercus liaotungensis populations of five tree species was studied in forest and Pinus tabulaeformis） in Malan forest region on the Loess Plateau. The results showed that the seedlings and saplings of Q. liaotungetuis, Acer ginnala and Acer grosseri dominated the under layer of forest canopy, with high densities and occurrence frequencies. P. tabulaeformis and Taxicodendron vernicifluum had abundant seedlings but few saplings. The inverse J-shaped size structure of Q. liaotungensis indicated the nice banks and sapling banks. Q. liaotungensis seedlings regeneration and the continuous existence of its seedling occurred more likely in the gaps, suggesting that canopy gaps might contribute to the regeneration of this species. Therefore, it seemed that the regeneration of seedling banks under the canopy was as important as the regeneration in gaps to maintain the stabilization of Q. liaotungensis population. A. ginnala and A. grosseri seedlings and saplings were more inclined to occupy the under layer of forest canopy, due to their strong shade tolerance or shade avoidance Seedling and sapling banks were a main strategy for regeneration of A. ginnala and A. grosseri. In terms of regeneration strategies, the key for understanding the coexistence of species might be the different regeneration niches including other factors such as the different ecological properties of the seedlings and saplings.

关 键 词：黄土高原 马栏林区 更新 幼苗 幼树 

分 类 号：Q948.1[生物学—植物学]