Effects of dwarf bamboo density on early seedling regeneration of Carpinus viminea Wall.
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摘要: 通过去除法控制竹丛密度，人为设置4种竹丛密度梯度[密度1：（3.83±0.53）株/m2；密度2：（16±1.80）株/m2；密度3：（39±1.69）株/m2；密度4：（69±2.15）株/m2]，测定不同密度竹丛下的微环境（包括土壤温度、湿度、电导率、凋落物厚度），研究竹丛密度及微环境对雷公鹅耳枥（Carpinus viminea Wall.）幼苗数量、存活动态、生长情况的影响。结果显示，竹丛密度对环境有显著影响，随着竹丛密度的增加，竹丛盖度、凋落物厚度、土壤温度升高明显；雷公鹅耳枥幼苗萌生量显著减少，4组密度梯度中幼苗数量分布依次排序为：密度1（28.53±3.14）株/m2 > 密度2（17.36±1.45）株/m2 > 密度3（12.36±0.93）株/m2 > 密度4（8.92±0.93）株/m2，表明随着小径竹密度增加，其对雷公鹅耳枥幼苗萌发的抑制作用越强；小径竹的密集生长可对雷公鹅耳枥幼苗的存活率产生影响，且对幼苗的生长具有一定抑制作用。研究结果表明小径竹密集生长的环境不仅抑制了雷公鹅耳枥新生幼苗的分布和幼苗生长，还对种群的更新以及森林群落的演替产生一定的负面影响。Abstract: To investigate bamboo cluster control by removal, we established four density gradients of the dwarf bamboo (density 1: (3.83±0.53) ramet/m2; density 2: (16±1.80) ramet/m2; density 3: (39±1.69) ramet/m2; density 4: (69±2.15) ramet/m2) to determine different microenvironment measures (soil temperature, soil humidity, soil conductivity, and litter thickness) under different densities and clarify the influence of bamboo density and microenvironment on seedling number, seedling survival, and growth of dominant species Carpinus viminea. Results showed significant differences in environmental factors under different bamboo densities. With the increase in bamboo density, litter thickness, soil temperature, and soil moisture were significantly increased. In contrast, the number of seedlings of C. viminea significantly decreased, with the distribution of seedlings in the four population gradients ranked as: density 1 (28.53±3.14) ind/m2 > density 2 (17.36±1.45) ind/m2 > density 3 (12.36±0.93) ind/m2 > density 4 (8.92±0.93) ind/m2, indicating a stronger inhibitory effect on seedling germination with the increase in density. Thus, the density of the dwarf bamboo affected the survival rate and growth of C. viminea seedlings. Our results showed that dense dwarf bamboo not only inhibited seedling distribution and seedling growth of C. viminea, but also had a negative impact on population regeneration and succession of forest communities.
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