Zhao Xue, Liu Yan-Yan, Jin Guang-Ze
Center for Ecological Research, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2013 Nov;24(11):3035-42.
To explore the responses of forest seedlings to topographic heterogeneity, nine hundreds of 4 m2 (2 m x 2 m) quadrats with perennial seedlings (H > or = 30 cm, DBH < 1 cm) were installed in a 9 hm2 plot in a typical mixed broadleaved-Korean pine forest in Xiaoxing' an Mountains. Based on the investigation data in 2006, 2008, and 2010, the effects of topography on the seedling establishment were studied. There were a total of 26 tree species in these quadrats. In 2006, 2008, and 2010, the total number of the tree seedlings was 4514, 6464, and 5611 individuals x hm(-2), respectively, among which, the seedlings of the top 10 species occupied >90% of the total. Topography had significant effects on the seedling distribution of the 8 major tree species. For Syringa reticulate var. mandshurica, Abies nephrolepis, Acer mono, Ulmus japonica, A. ukurunduense, Tilia amurensis, and A. tegmentosum, the spatial distribution of the seedlings was consistent with that of grown trees; but for Pinus koraiensis, the spatial distribution of seedlings was inconsistent with that of the grown trees. The mortality of S. reticulate var. mandshurica, A. nephrolepis, U. laciniata, A. tegmentosum, and T. amurensis seedlings was significantly correlated with the topography. The recruitment of S. reticulate var. mandshurica, U. japonica, P. koraiensis, A. nephrolepis, Fraxinus mandshurica, A. mono, and T. amurensis seedlings was also significantly correlated with the topography.
为探究森林幼苗对地形异质性的响应，在小兴安岭典型的阔叶红松林9公顷样地内设置了900个4平方米（2米×2米）的样方，样方内为多年生幼苗（苗高H≥30厘米，胸径DBH＜1厘米）。基于2006年、2008年和2010年的调查数据，研究了地形对幼苗更新的影响。这些样方内共有26个树种。2006年、2008年和2010年，树木幼苗总数分别为4514株、6464株和5611株/公顷，其中前10个树种的幼苗占总数的90%以上。地形对8个主要树种的幼苗分布有显著影响。对于紫丁香、臭冷杉、色木槭、春榆、乌苏里桤木、紫椴和黄檗，幼苗的空间分布与成年树木一致；但对于红松，幼苗的空间分布与成年树木不一致。紫丁香、臭冷杉、裂叶榆、黄檗和紫椴幼苗的死亡率与地形显著相关。紫丁香、春榆、红松、臭冷杉、水曲柳、色木槭和紫椴幼苗的更新也与地形显著相关。
