林业科学 ›› 2023, Vol. 59 ›› Issue (2): 30-39.doi: 10.11707/j.1001-7488.LYKX20210869
张晓红1,2,周超凡1,2,张状1,2,冯林艳1,2,符利勇1,2,张会儒2,3,*
收稿日期:
2021-11-24
出版日期:
2023-02-25
发布日期:
2023-04-27
通讯作者:
张会儒
基金资助:
Xiaohong Zhang1,2,Chaofan Zhou1,2,Zhuang Zhang1,2,Linyan Feng1,2,Liyong Fu1,2,Huiru Zhang2,3,*
Received:
2021-11-24
Online:
2023-02-25
Published:
2023-04-27
Contact:
Huiru Zhang
摘要:
目的: 以崇礼冬奥核心区华北落叶松人工近熟林为研究对象,探讨目标树抚育间伐采伐木选择方法及其对林分空间结构的影响,为更加合理开展森林经营活动、促进人工林质量提升提供科学依据。方法: 设置并调查6块面积0.09 hm2(30 m×30 m)标准地,按125株·hm?2目标树密度,采用定性与定量指标相结合的方法标记目标树。基于树冠重叠和树冠光竞争高度构建采伐木选择指标,设置不同光竞争截止系数(c)模拟选择采伐木,分析采伐强度变化,运用角尺度、混交度、密集度、交角竞争指数、林层指数和综合空间结构指数分析不同c值下目标树和林分空间结构指标的变化。结果: c取值在0~1之间时,株数采伐强度和断面积采伐强度在10%~35%范围内变化,且呈随c值增大而降低的相同变化趋势。经模拟采伐后目标树空间结构得到优化,改善幅度随采伐强度增大而增大。综合空间结构指数在
中图分类号:
张晓红,周超凡,张状,冯林艳,符利勇,张会儒. 基于光竞争截止系数的崇礼冬奥核心区华北落叶松人工林目标树抚育间伐模拟[J]. 林业科学, 2023, 59(2): 30-39.
Xiaohong Zhang,Chaofan Zhou,Zhuang Zhang,Linyan Feng,Liyong Fu,Huiru Zhang. Simulation on Crop Tree Management Tending and Thinning of Larix principis-rupprechtii Plantation in Chongli Winter Olympics Core Area Based on Coefficient of Light Competition[J]. Scientia Silvae Sinicae, 2023, 59(2): 30-39.
表1
标准地林分因子统计①"
标准地号Plot code | 树种组成Composition oftree species | 株数Stem number/hm?2 | 郁闭度Canopy cover | 胸径DBH/cm | 树高Height/m | 冠幅半径Crown diameter/m | ||||||||
最小Min. | 均值Mean | 最大Max. | 最小Min. | 均值Mean | 最大Max. | 最小Min. | 均值Mean | 最大Max. | ||||||
Ⅰ | 7L3B | 1 622 | 0.83 | 5.3 | 15.8 | 25.7 | 5.1 | 12.5 | 17.1 | 1.1 | 1.7 | 3.6 | ||
Ⅱ | 10L | 1 556 | 0.82 | 5.2 | 17.0 | 25.7 | 5.1 | 13.5 | 18.1 | 1.0 | 1.6 | 2.3 | ||
Ⅲ | 9L1B | 1 300 | 0.88 | 5.8 | 18.1 | 26.8 | 4.2 | 13.5 | 16.9 | 0.6 | 2.0 | 3.3 | ||
Ⅳ | 10L | 1 622 | 0.83 | 5.0 | 14.7 | 23.7 | 5.2 | 13.0 | 14.6 | 0.9 | 1.7 | 2.5 | ||
Ⅴ | 8L2B | 1 667 | 0.82 | 5.0 | 15.4 | 22.6 | 5.8 | 12.4 | 17.3 | 0.9 | 1.7 | 2.6 | ||
Ⅵ | 9L1B | 1 233 | 0.85 | 5.0 | 16.7 | 29.4 | 3.7 | 13.1 | 20.6 | 0.9 | 1.9 | 3.1 |
表2
目标树基本因子统计"
标准地号Plot code | 株数Stem number | 胸径DBH/cm | 树高Height/m | 冠幅半径Crown diameter/m | ||||||||
最小Min. | 均值Mean | 最大Max. | 最小Min. | 均值Mean | 最大Max. | 最小Min. | 均值Mean | 最大Max. | ||||
I | 11 | 20.5 | 22.6 | 25.7 | 12.6 | 15.1 | 16.6 | 1.6 | 2.2 | 2.5 | ||
II | 11 | 20.8 | 22.8 | 25.7 | 13.8 | 14.9 | 15.5 | 1.8 | 1.9 | 2.2 | ||
III | 11 | 20.3 | 23.2 | 26.4 | 13.6 | 15.1 | 16.9 | 2.1 | 2.4 | 2.9 | ||
Ⅳ | 11 | 19.1 | 21.4 | 23.7 | 12.4 | 14.3 | 15.9 | 1.7 | 2.3 | 2.5 | ||
Ⅴ | 11 | 19.2 | 21.2 | 23.6 | 12.6 | 14.5 | 15.4 | 1.6 | 2.0 | 2.5 | ||
Ⅵ | 11 | 20.6 | 23.1 | 27.7 | 13.5 | 15.2 | 16.7 | 1.7 | 2.2 | 2.8 |
表3
采伐前后目标树空间结构指标变化"
指标Parameters | 伐前Before cutting | 伐后After cutting | ||||
c=1.0 | c=0.9 | c=0.8 | c=0.7 | c=0.6 | ||
Q | 3 198±560.6 | 3 363.1±434.6 | 3 775.1±352.9 | 4 217.7±326.1 | 4 515.5±438 | 4 653.2±372 |
Q变化幅度Change range of Q(%) | — | 5.16 | 18.05 | 31.88 | 41.20 | 45.50 |
| 0.462±0.043 | 0.477±0.049 | 0.477±0.064 | 0.53±0.047 | 0.545±0.032 | 0.523±0.019 |
| — | 3.22 | 3.22 | 14.69 | 17.93 | 13.17 |
| 0.114±0.103 | 0.129±0.124 | 0.152±0.142 | 0.159±0.14 | 0.174±0.149 | 0.174±0.149 |
| — | 13.16 | 33.33 | 39.47 | 52.63 | 52.63 |
| 0.955±0.019 | 0.864±0.098 | 0.735±0.139 | 0.614±0.17 | 0.508±0.187 | 0.530±0.198 |
| — | ?9.52 | ?23.02 | ?35.71 | ?46.83 | ?44.44 |
| 0.419±0.103 | 0.419±0.103 | 0.467±0.123 | 0.49±0.101 | 0.485±0.108 | 0.500±0.087 |
| — | 0 | 11.46 | 16.95 | 15.75 | 19.33 |
| 0.454±0.01 | 0.433±0.003 | 0.425±0.004 | 0.42±0.006 | 0.419±0.005 | 0.416±0.008 |
| — | ?4.63 | ?6.39 | ?7.49 | ?7.71 | ?8.37 |
表4
采伐前后林分空间结构指标变化"
指标Parameters | 伐前Before cutting | 伐后After cutting | ||||
c=1.0 | c=0.9 | c=0.8 | c=0.7 | c=0.6 | ||
Q | 2 835.5±233.3 | 2 914.5±192.5 | 3 018.1±194.3 | 3 135.5±148.1 | 3 226.2±129.9 | 3 270.1±131.2 |
Q变化幅度Change range of Q(%) | — | 2.79 | 6.44 | 10.58 | 13.78 | 15.33 |
| 0.459±0.024 | 0.456±0.027 | 0.455±0.032 | 0.467±0.032 | 0.473±0.025 | 0.469±0.027 |
| — | ?0.65 | ?0.87 | 1.74 | 3.05 | 2.18 |
| 0.106±0.082 | 0.116±0.088 | 0.123±0.091 | 0.128±0.093 | 0.132±0.096 | 0.135±0.098 |
| — | 9.43 | 16.04 | 20.75 | 24.53 | 27.36 |
| 0.918±0.032 | 0.873±0.05 | 0.828±0.048 | 0.782±0.057 | 0.764±0.059 | 0.758±0.062 |
| — | ?4.90 | ?9.80 | ?14.81 | ?16.78 | ?17.43 |
| 0.362±0.025 | 0.348±0.028 | 0.346±0.034 | 0.349±0.031 | 0.353±0.029 | 0.357±0.026 |
| — | ?3.87 | ?4.42 | ?3.59 | ?2.49 | ?1.38 |
| 0.545±0.014 | 0.541±0.019 | 0.539±0.02 | 0.538±0.021 | 0.537±0.023 | 0.536±0.023 |
| — | ?0.73 | ?1.10 | ?1.28 | ?1.47 | ?1.65 |
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