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森林生态系统内主要乔木的高度生态位反映了不同树种在各个高度资源单位内资源利用的互补情况，同时也是表征森林生态系统演替的趋势及其森林循环过程主要特征之一．生物学特性和生态学特性接近的树种的高度生态位重叠较大，反之则较小．在Ｇａｐ内，色木槭和扭筋槭的高度生态位重叠最大，而青楷槭和千金榆、花楷槭和水曲柳、青楷槭和裂叶榆的高度生态位重叠较小；在非Ｇａｐ生态系统内，青楷槭和白牛槭的高度生态位重叠最大，青楷槭和裂叶榆、青楷槭和千金榆、花楷槭和水曲柳的高度生态位重叠较小．红松和阔叶树之间的高度生态位分离较大，利用资源的方式和能力差异较大，它们之间可以在不同空间的资源利用上达到互补，种间竞争较弱，从而能够保持红松和阔叶树之间长期而稳定的共存．但Ｇａｐ内红松和阔叶树的高度生态位重叠均大于非Ｇａｐ生态系统，可见Ｇａｐ的存在加大了红松和阔叶树之间的种间竞争，减小了红松和阔叶树之间的资源互补利用的能力．Ｇａｐ削弱了个体生态位重叠值较大的树种间的种间竞争，增强了个体生态位重叠值较小的树种间的种间竞争
The height niche of main trees in forest ecosystem reflects the complementary use of resources of different tree species in each high resource unit and is also one of the main characteristics of the trend of forest ecosystem succession and the process of forest cycle. The ecological niche and ecological characteristics close to the species of high niche overlap, otherwise smaller. In Gap, the height niche overlap of A. japonicus and C. distichum was the largest, while that of A. japonicum and A. chinense, A. japonica, Fraxinus mandshurica, In the non-Gap ecosystem, the maximum niche overlap of Qingkai maple and Anemarrhena asphodelus was the largest, and the overlap of Niche maple and Crassulaceae, Cymbidium grandiflora and Aegiceras corniculatum and Nicotiana tabacum were smaller. The high niche between pine and broad-leaved tree is larger, the ways and abilities to utilize resources are quite different, and they can complement each other in the utilization of resources in different space. Long-term and stable coexistence between broad-leaved trees. However, the height niche overlaps of Korean pine and broad-leaved trees in Gap were greater than that of non-Gap ecosystem. Therefore, the existence of Gap increased the interspecific competition between Korean pine and broad-leaved trees and reduced the complementary use of resources between Korean pine and broad-leaved trees Ability. Gap weakened the interspecific competition between tree species with larger niche overlap and enhanced the interspecific competition among species with smaller niche overlap