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森林更新的特点是森林群落长期自然选择的结果。林冠下天然更新能力的强弱,影响着森林植物群落结构的格局和演替趋势。云冷杉林分林冠下的天然更新有其自身的独特规律性。一、调查地区调查地区为云南省迪庆藏族自治州中甸县的尼汝和三坝林区,位于哈巴雪山东侧。属滇西北横断山高山峡谷区,最高海拔5000米,最低1600米,一般海拔3000米以_匕绝对高差
Forest renewal is characterized by the long-term natural selection of forest communities. The strength of natural regeneration ability under canopy affects the pattern and succession trend of forest plant community structure. The natural regeneration under the canopy of spruce stands has its own unique regularity. I. Survey Areas The survey area is Niru and Sanbaolin in Zhongdian County, Diqing Tibetan Autonomous Prefecture, Yunnan Province. It is located on the east side of Haba Snow Mountain. Is a mountainous and mountainous region of Hengduan Mountains in northwestern Yunnan, the highest elevation of 5000 meters, the lowest 1600 meters, the general altitude of 3000 meters _ dagger absolute height difference