Natural regeneration factors of Abies georgei var. smithii seedlings in Sejila Mountain
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摘要:
目的 分析影响色季拉山典型天然林急尖长苞冷杉Abies georgei var. smithii天然更新影响因子，为有效提高其天然更新提供理论指导。 方法 基于野外样方调查，分析色季拉山阴坡与阳坡5种影响因子与急尖长苞冷杉天然更新幼苗密度的相关性；通过通径分析找到影响其天然更新的关键因子。 结果 阳坡和阴坡种子带翅长度、种子千粒重、苔藓厚度、凋落物厚度及阳坡林分郁闭度与急尖长苞冷杉天然更新幼苗密度均呈现极显著正相关(P＜0.01)；通径分析认为阳坡凋落物厚度是影响急尖长苞冷杉天然更新幼苗生长的最关键因子，阳坡各影响因子对幼苗密度的影响大小依次为凋落物厚度、种子千粒重、苔藓厚度、种子带翅长度、林分郁闭度；阴坡苔藓厚度是影响急尖长苞冷杉天然更新幼苗生长的最关键因子，阴坡各影响因子对幼苗密度的影响大小依次为苔藓厚度、凋落物厚度、种子千粒重、林分郁闭度、种子带翅长度。 结论 凋落物厚度是影响色季拉山阳坡急尖长苞冷杉天然更新幼苗密度的最大因子，阴坡苔藓厚度是最关键因子。表3参27 Abstract:Objective This paper with an analysis of the influencing factors of natural regeneration of Abies georgei var. smithii in Sejila Mountain, is aimed to provide theoretical guidance for the effective promotion of its natural regeneration. Method Based on a field sample survey as well as an analysis of the correlation between the seedlings density and the five influencing factors on shady and sunny slopes of A. georgei var. smithii in Sejila Mountain, the path analysis was carried out to find out the key factors affecting its natural regeneration. Result On both sunny and shady slopes, there was a significant positive correlation between the natural regeneration seedlings and the length of seed wing, 1000-seed weight, moss thickness, litter thickness, canopy density of sunny slope. Litter thickness was the most important factor affecting the growth of natural regeneration seedlings of A. georgei var. smithii on sunny slope and the order of contribution to seedlings density was litter thickness, 1 000-seed weight, moss thickness, winged seed length and canopy density. Moss thickness was the most important factor affecting the growth of natural regeneration seedlings of A. georgei var. smithii on shady slope and the order of contribution to seedlings density was moss thickness, litter thickness, 1000-seed weight, canopy density and winged seed length. Conclusion Litter thickness was the largest factor affecting the density seedlings of A. georgei var.smithii on sunny slope, while moss thickness on shady slope was the most critical factor. [Ch, 3 tab. 27 ref.] -
表 1 天然更新影响因子与幼苗数量
Table 1. Each influencing factor of natural regeneration and seedings density
坡向 海拔/m X1 X2 X3 X4 X5 Y 阳坡 3700 75.12±2.79 a 12.45±0.50 a 10.38±0.14 c 5.50±0.21 b 8.38±0.46 a 8.80±0.30 b 3800 64.96±4.59 a 12.36±0.33 a 12.37±0.11 a 8.05±0.31 a 8.57±0.44 a 6.20±0.64 b 3900 69.65±3.16 a 13.27±0.29 a 11.25±0.14 b 5.90±0.36 b 8.52±0.43 a 14.24±1.32 a 4000 49.74±5.00 b 11.06±0.42 c 9.69±0.07 d 3.74±0.20 c 4.73±0.21 b 5.40±0.83 c 4100 49.52±3.42 b 11.54±0.40 b 8.60±0.20 e 2.20±0.16 d 4.38±0.37 b 5.60±0.92 c 4200 40.05±2.98 b 11.11±0.24 c 8.02±0.13 f 1.28±0.13 e 3.41±0.29 b 0.83±0.11 d 阴坡 3700 65.16±1.05 a 12.01±1.06 a 8.72±0.21 b 10.62±0.27 b 9.31±0.18 a 13.44±0.58 a 3800 64.83±1.97 a 12.04±0.44 a 10.38±0.11 a 10.06±0.18 b 9.33±0.18 a 11.61±1.54 a 3900 60.16±2.11 a 12.74±1.11 a 10.46±0.14 a 12.27±0.19 a 9.54±0.16 a 15.19±1.62 a 4000 59.62±1.05 a 11.99±0.79 a 8.31±0.20 b 4.30±0.14 d 4.66±0.15 b 11.40±0.75 a 4100 59.25±1.29 a 11.17±0.63 b 7.58±0.21 c 5.25±0.15 c 4.55±0.15 b 9.69±0.68 b 4200 49.41±1.05 b 10.68±0.51 c 6.72±0.32 d 2.51±0.13 e 4.34±0.18 b 5.00±0.90 c 说明：X1为林分郁闭度(%)；X2为种子带翅长度(mm)；X3为种子千粒重(g)；X4为苔藓厚度(cm)；X5为凋落物厚度(cm)；Y为幼苗密度 (株·m−2)。小写字母表示不同海拔间差异显著(P＜0.05) 
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表 2 天然更新影响因子与幼苗密度的相关性分析
Table 2. Correlation coefficients between each influencing factor of natural regeneration and seedings density
因子 X1 X2 X3 X4 X5 Y 阳坡 X1 1.000 0.464** 0.603** 0.551** 0.605** 0.467** X2 1.000 0.414** 0.346** 0.450** 0.438** X3 1.000 0.763** 0.774** 0.543** X4 1.000 0.638** 0.344** X5 1.000 0.586** 阴坡 X1 1.000 0.198 0.228 0.298* 0.296* 0.210 X2 1.000 0.547** 0.541** 0.492** 0.390** X3 1.000 0.787** 0.755** 0.579** X4 1.000 0.945** 0.612** X5 1.000 0.509** 说明：X1为林分郁闭度(%)；X2为种子带翅长度(mm)；X3为种子千粒重(g)；X4为苔藓厚度(cm)；X5为凋落物厚度(cm)；Y为幼苗密度 (株·m−2)。*表示P＜0.05，**表示P＜0.01
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表 3 天然更新影响因子与幼苗密度的通径分析
Table 3. Path analysis between each influencing factor of natural regeneration and seedings density on sunny
因子 直接作用 决定系数 相关系数 间接作用 X1→Y X2→Y X3→Y X4→Y X5→Y 合计 阳坡 X1 0.118 0.014 0.467** 0.084 0.191 −0.135 0.208 0.348 X2 0.182 0.033 0.438** 0.055 0.131 −0.085 0.154 0.255 X3 0.317* 0.100 0.543** 0.071 0.075 −0.187 0.262 0.221 X4 −0.245* 0.060 0.344** 0.065 0.064 0.242 0.219 0.590 X5 0.343* 0.118 0.586** 0.071 0.082 0.245 −0.156 0.242 阴坡 X1 0.042 0.002 0.210 0.003 0.062 0.301 −0.198 0.168 X2 0.016 0.000 0.390** 0.008 0.148 0.546 −0.329 0.197 X3 0.270 0.073 0.579** 0.010 0.009 0.795 −0.505 0.309 X4 1.010** 1.020 0.612** 0.013 0.009 0.212 −0.632 −0.398 X5 −0.669* 0.448 0.509** 0.012 0.008 0.204 0.954 1.178 说明：X1为林分郁闭度(%)；X2为种子带翅长度(mm)；X3为种子千粒重(g)；X4为苔藓厚度(cm)；X5为凋落物厚度(cm)；Y为幼苗 密度(株·m−2)。括号内数字为决定系数。*表示 P＜0.05，**表示 P＜0.01
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