In this paper, the natural secondary forest of Quercus mongolica was selected as the experimental area in Daxing'an Mountains.The strip cultivation was divided into 6 m (S1) , 10 m (S2) , 14 m (S3) and 18 m (S4) sample plots according to the bandwidth.The strip length was 300 m.The area of 6 sample plots was divided into 25 m2 (G1) 、100 m2 (G2) 、225 m2 (G3) 、400 m2 (G4) 、625 m2 (G5) 、900 m2 (G6) were reserved.The coniferous and broad-leaved tree species in the strip were cut down except for the purpose.Each strip was divided into three plots with an average length of 100 m.Pinus sibirica, Pinus sylvestris and Larix gmelinii were planted separately, and stand and site conditions were selected.Similar plots were used as control plots CK.A comprehensive evaluation index system covering 38indexes, such as litter water holding capacity, vegetation biodiversity, soil physical properties, soil chemical properties, photosynthesis and growth of regenerated seedlings, was established.The results showed that the improvement scores of different models were S2 (0.757)>G2 (0.740)>S3 (0.446)>G3 (0.216)>G1 (0.158)>S4 (0.001)>S1 (-0.111)>G4 (-0.304)>G5 (-0.604)>CK (-0.608)>G6 (-0.690) .Among them, S2 plot and G2 plot had the highest comprehensive score, indicating that 10 m (S2) strip cultivation and 100 m2 (G2) block cultivation had the best effect, and were most suitable for the cultivation of natural secondary forest of Quercus mongolica in Daxing'an Mountains.The research results provided a scientific and reliable theory for the sustainable management of natural secondary forest of Quercus mongolica in Daxing'an Mountains.%本文在大兴安岭林区选取蒙古栎天然次生林作为改培试验区, 带状改培按照带宽不同分为:6 m (S1) 、10 m (S2) 、14 m (S3) 、18 m (S4) 改培样地, 改培带的带长300 m;块状改培按照6个改培样地的面积分为:25 m2 (G1) 、100 m2 (G2) 、225 m2 (G3) 、400 m2 (G4) 、625 m2 (G5) 、900 m2 (G6) .保留改培带内针叶幼苗树种, 伐除非目的的针叶和阔叶树种, 每条改培带平均分成3段样地, 长度为100 m, 分别栽植西伯利亚红松、樟子松、兴安落叶松, 同时选择林分和立地条件相似的样地作为对照样地CK.建立涵盖枯落物持水性能、植被生物多样性、土壤物理性质、土壤化学性质、光合作用和更新苗木生长状况等38项指标的综合评价指标体系, 运用主成分分析法对蒙古栎天然次生林的改造效果进行综合评价.结果表明:不同模式的改培得分依次是S2 (0.757)>G2 (0.740)>S3 (0.446)>G3 (0.216)>G1 (0.158)>S4 (0.001)>S1 (-0.111)>G4 (-0.304)>G5 (-0.604)>CK (-0.608)>G6 (-0.690) .其中, S2样地和G2样地的综合得分最高, 说明10 m (S2) 带状改培和100 m2 (G2) 块状改培模式效果最好, 最适合大兴安岭地区蒙古栎天然次生林的改培, 研究的成果为后续大兴安岭蒙古栎天然次生林的可持续经营提供科学可靠的理论依据.
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