Bulletin of Botanical Research ›› 2024, Vol. 44 ›› Issue (2): 279-288.doi: 10.7525/j.issn.1673-5102.2024.02.013
• Physiology and Ecology • Previous Articles Next Articles
Jiongkun HE1,2, Zhenwei XU1,2, Rukang SHI1,2, Dayong HAN1,2()
Received:
2023-06-16
Online:
2024-03-20
Published:
2024-03-11
Contact:
Dayong HAN
E-mail:411430667@qq.com
CLC Number:
Jiongkun HE, Zhenwei XU, Rukang SHI, Dayong HAN. Quantitative Characteristics and Influencing Factors of Regeneration Seedlings of Different Decay Grades of Pinus schrenkiana, Western Tianshan Mountains[J]. Bulletin of Botanical Research, 2024, 44(2): 279-288.
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URL: https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2024.02.013
Table 1
Judgment criteria for Pinus schrenkiana of different decay grades in the west Tianshan Mountains
腐解等级 Decay grade | 判别标准 Judgment criteria |
---|---|
Ⅰ级 Grade Ⅰ | 结构完整,枝、叶、皮俱存,木质体坚实,死亡不足1年,木质体新鲜而坚固 The structure is intact,with branches, leaves, and skins present.The woody body is solid, with less than 1 year of death.The woody body is fresh and strong |
Ⅱ级 Grade Ⅱ | 心材完好,边材腐解,树皮完整,大枝存在,木质体较坚实,开始分解,小刀尖端可刺入几毫米 The heartwood is intact,the sapwood decays, the bark is intact,and the large branches exist.The woody body is relatively solid and begins to decompose.The tip of the small knife can pierce a few millimeters |
Ⅲ级 Grade Ⅲ | 心材完好,边材消失,部分树皮脱落,仅存大粗枝,木质体开始变软小刀可刺入约2 cm The heartwood is intact,the sapwood disappears, some bark falls off,only large and thick branches remain,and the woody body begins to soften.A small knife can penetrate about 2 cm |
Ⅳ级 Grade Ⅳ | 心材腐解,仅存部分树皮,木质体变软,小刀可刺2~5 cm Heart wood decays,only part of the bark remains,the wood becomes soft, and a small knife can pierce 2-5 cm |
Ⅴ级 Grade Ⅴ | 严重腐解,木质体破碎,木质体变软至粉末,小刀可轻易刺穿木质体 Severe decomposition,wood fragmentation, wood softening to powder,small knives can easily pierce wood |
Table 2
Quantitative characteristics of spruce seedlings regenerated from fallen wood at different decomposition grades in Pinus schrenkiana, Tianshan Mountains
腐解等级 Decomposi- tion grade | 幼苗总数量/株 Total number of seedlings | 数量占比 Quantity/% | 存活幼苗数量/株 Number of surviv- ing seedlings | 数量占比 Quantity/% | 死亡幼苗数量/株 Number of dead seedlings | 数量占比 Quantity/% | 死亡率 Death rate/% | 倒木数量/株 Quantity of fallen wood | 出现幼苗的倒木数量 Number of fallen trees with seedlings | 频率 Frequency/% | 倒木上幼苗密度/(株·m-2) Seedling density on fallen wood |
---|---|---|---|---|---|---|---|---|---|---|---|
Ⅰ | 7 | 0.35 | 5 | 0.27 | 2 | 1.63 | 28.57 | 67 | 2 | 2.99 | 0.402 |
Ⅱ | 277 | 13.85 | 256 | 13.64 | 21 | 17.07 | 7.58 | 146 | 24 | 16.44 | 2.518 |
Ⅲ | 1 257 | 62.85 | 1 172 | 62.44 | 85 | 69.11 | 6.76 | 136 | 71 | 52.21 | 4.005 |
Ⅳ | 446 | 22.30 | 431 | 22.96 | 15 | 12.19 | 3.36 | 60 | 22 | 36.67 | 6.746 |
Ⅴ | 13 | 0.65 | 13 | 0.69 | 0 | 0 | 0 | 40 | 4 | 10.00 | 1.415 |
Table 3
Multiple linear regression analysis of the number of regeneration seedlings of Picea schrenkiana in the western Tianshan Mountains
幼苗状态 Seedling status | 回归方程系数Coefficient of regression equation | ||||||
---|---|---|---|---|---|---|---|
常量 Constant | 腐解等级 Decomposition grade | 含水量 Water content | 倒木表面积 Surface area of fallen wood | 坡向 Slope aspect | 坡度 Falling gradient | 海拔 Altitude | |
存活幼苗 Surviving seedling | -4.680 | 1.224* | 0.384** | 1.314** | 0.023 | 0.004 | -0.005 |
死亡幼苗 Dead seedlings | -31.329 | 0.098 | -0.006 | 0.120** | 0.009* | -0.004 | 0.018 |
Table 4
Multiple linear regression analysis of the factors affecting the number of regeneration seedlings on the fallen trees of P. schrenkiana with different decomposition grades in the western Tianshan Mountains
腐解等级 Decomposition grade | 回归方程系数Coefficient of regression equation | |||||
---|---|---|---|---|---|---|
常量 Constant | 含水量 Water content | 倒木表面积 Surface area of fallen wood | 坡向 Slope aspect | 坡度 Falling gradient | 海拔 Altitude | |
Ⅰ级 Grade Ⅰ | 21.327 | 0.065* | 0.035 | 0.001 | -0.028 | -0.013 |
Ⅱ级 Grade Ⅱ | -13.095 | 0.719** | 0.729** | 0.023 | -0.134 | 0.003 |
Ⅲ级 Grade Ⅲ | -15.101 | 0.039 | 1.924** | 0.062* | 0.2 | -0.001 |
Ⅳ级 Grade Ⅳ | 97.324 | -0.003 | 4.365** | 0.035 | -0.281 | -0.063 |
Ⅴ级 Grade Ⅴ | -18.774 | 0.035 | 0.077 | -0.005 | 0.032 | 0.011 |
Table 5
Multiple linear regression analysis of the factors affecting the number of regeneration seedlings at different height levels on fallen spruce trees at different decay grades in the western Tianshan Mountains
腐解等级 Decomposition grade | 高度等级 Height level | 回归方程系数Coefficient of regression equation | |||||
---|---|---|---|---|---|---|---|
常数 Constant | 含水量 Water content | 倒木表面积 Surface area of fallen wood | 坡向 Slope aspect | 坡度 Falling gradient | 海拔 Altitude | ||
Ⅱ级 Grade Ⅱ | A1 | -10.170 | 1.709* | 0.947* | 0.090 | 0.343 | -0.170 |
A2 | 101.199 | 0.906* | 0.375 | 0.015 | 0.093 | -0.700 | |
A3 | 5.198 | 0.114 | 0.034 | 0.001 | 0.014 | -0.004 | |
A4 | 15.350 | 0.003 | -0.008 | -0.003 | -0.012 | -0.009 | |
Ⅲ级 Grade Ⅲ | A1 | -52.966 | 0.101 | 0.780* | 0.039 | 0.208 | 0.028 |
A2 | -69.132 | -0.050 | 0.204 | 0.025 | 0.100 | 0.041 | |
A3 | -13.715 | -0.019 | 0.031 | 0.009* | 0.020 | 0.008 | |
A4 | -2.874 | -0.003 | 0.013 | 0.002 | 0.003 | 0.002 | |
Ⅳ级 Grade Ⅳ | A1 | 1 168.433 | 1.362 | -0.010 | 0.109 | -0.970 | -0.715 |
A2 | 681.802 | 0.469 | -0.249 | 0.047 | -0.738 | -0.409 | |
A3 | 107.015 | 0.061 | -0.031 | 0.007 | -0.124 | -0.064 | |
A4 | 29.019 | 0.022 | -0.018 | 0.002 | -0.042 | -0.017 |
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