桤木人工用材林改建母树林技术

采用定株环状均匀疏伐法,依据留优去劣原则和母树等级划分标准,对10年生桤木与杨树优良混交人工林进行首次疏伐,桤木株数采伐强度为40%,杨树全伐,同时对母树进行修枝、截干和抚育施肥等管理。改建后桤木母树林保留密度为405～480株/hm2,郁闭度为0.5～0.6,平均树高和胸径分别为12.86 m和14.16 cm。

Technique of Transferring Wood -supplying Plantation to Seed- producing Forest of Alnus cremastogyne

The technique of transferring wood-supplying plantation to seed-producing forest of Alnus cremastogyne was explored.According to the principle of removing inferior plants and remaining superior plants as well as the grading standard of mother trees(seed-producing trees),the method of plant-locating cyclic even thinning was used for the first thinning of artificial mixed forest of 10-year-old A.cremastogyne and poplar,the cutting intensity of A.cremastogyne mother tree was 40%,and that of poplar mother tree was 100%.Meanwhile,some measures such as pruning,trunk cutting,tending and fertilization were necessary in the reconstructing process.After reconstruction,the reserved density of seed-producing forest of A.cremastogyne was 405~480 plants per hectare,the canopy degree was from 0.5 to 0.6,and the average tree height and stem diameter was 12.86 meter and 14.16 centimeter respectively.