【摘要】 利用全林木定位和单木竞争指数模型,以受到林火干扰的樟子松林为例,分析了呼伦贝尔沙地樟子松林的竞争强度.结果表明:同一样地中,死亡林木的竞争强度均比较接近;活立木、全部林木中,伴生树种的竞争强度是樟子松的2～3倍;樟子松的竞争压力主要来自于种内,伴生树种的竞争则主要来自于种间.林火干扰与无林火(对照)样地间的比较表明,林火干扰样地樟子松活立木的竞争强度均显著小于对照样地;活立木竞争强度与其胸径间均服从幂函数关系(CI=AD-B).地表火干扰可显著降低林木个体间的竞争强度,有利于存活林木个体的生长发育和大径阶林木的培育.更多还原

【Abstract】 By using totally locating method and single tree competition index model, this paper studied the competition intensity of Mongolian pine forests in Hulun Buir sand region of Inner Mongolia, with the fire-disturbed Mongolian pine forest as a case. The results showed that within the same sampling plots, dead trees had the similar competition intensity, while the accompanying species in living and whole stems had two or three times higher competition intensity than Mongolian pine. The competition stress of Mongolian pine mainly came from intra-specific, and that of accompanying species mainly came from inter-specific. The competition intensity of living Mongolian pine was significantly lower in fire-disturbed than in undisturbed plot, and the competition intensity (CI) of living stems had a power functional relationship with their diameter at breast height (D), i.e., CI=AD-B. It was concluded that surface fire could significantly decrease the competition intensity among the stems, which would benefit the growth and development of living stems and the culture of the stems with larger diameter of breast height.更多还原