Effects of Density Control on the Stand Features of Cunninghamia lanceolata Plantation
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摘要: 以洪雅林场杉木人工林为研究对象，研究密度调控对杉木林分生长、植物多样性、林分结构的影响。结果表明：杉木人工林分经密度调控后，低密度经营有利于林分的胸径、树高、材积加快生长，也能使树干更饱满，但不利于林分自然整枝；适宜的林分经营密度（750株·hm-2）能够增加灌草层的物种丰富度，而林分密度过高（1200株·hm-2）或过低（550株·hm-2）均降低了灌草层的物种丰富度，不利于林下植被演替发育；低经营密度林分的灌木和草本植物的物种多样性指数和均匀度指数都高于高经营密度林分，低经营密度林分使林下植物的群落复杂程度和物种个体分配均匀度更优异；随着林分经营密度的增大，林分中的大径级植株的比例逐步降低；合理密度（750株·hm-2）有利于林分树高生长；低经营密度有利于培育大径材植株，而高经营密度有利于培育中小径材植株。Abstract: A Cunninghamia lanceolata plantation of Hongya Forest Farm was selected as an object to research the stand features under density control from three respects of forest growth, species diversity and stand structure. The results showed that low density management was conducive to accelerating the growth of DBH,tree height,and wood vulume,which could also make the trunk fuller. However, low density management reduced the natural pruning capacity of the stand. Appropriate density management(750 plants·hm-2) could increase the species richness of the shrub and herb and layers,while the high density(12 000 plants·hm-2) or low density (550 plants·hm-2) reduced the species richness of the shrub and herb and layers.The species diversity index and evenness index of shrubs and herbs in low density stand were higher than those in high density stand.The low density management made the community complexity and the species distribution evenness better.With the increase of forest density, the proportion of large-diameter plants in the stand decreased gradually.Reasonable density(750 plants·hm-2) was conducive to the growth of tree heigght.Low management density was beneficial to cultivating large-diameter trees, while high management density was beneficial to cultivating medium and small-diameter wood plants.
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