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

doi:10.11707/j.1001-7488.LYKX20210869

Abstract

Abstract:

Objective: Taking larch near-mature plantations (Larix principis-rupprechtii) in the core area of Chongli Winter Olympics as objects, this paper was carried out to discuss the selection method of target trees thinning and its effects on forest spatial structure in order to provide scientific bases for reasonable management activities making and plantation quality improvement. Method: Six sample plots with the area of 0.09 hm² (30 m × 30 m) were set up and measured. 125 tree · hm^?2 target trees were marked according to qualitative and quantitative indicators. Based on crown overlap and crown light competition height, the method of cutting trees selection was developed, which was used to select cutting trees simulated in 6 sample plots by setting different values of light competition coefficient( $ c $ ). Changes on cutting intensity were analyzed while those of target tree and stand spatial structure indexes under different c values were analyzed by using angular scale, mingling, crowding, intersection competition index, storey index and comprehensive index. Result: The cutting intensity of both tree number and basal area varied from 10% to 35% when the value of $ c $ ranged from 0 to 1, indicating the same trend of decreasing with the increase of value of $ c $ . The spatial structure of target trees was optimized by simulated tending thinning, and the improvement increased along with the increase of cutting intensity. The maximum increase of comprehensive spatial structure index was 45.50% when value of $ c $ was 0.6. The maximum improvement of angular scale and crowding were 17.93% and 46.83%, respectively, under $ c $ value was 0.7, while other spatial structure parameters reached the maximum improvement with the values of $ c $ is 0.6. Thinning also optimized the spatial structure of stand, and improved the isolation degree of tree species, light transmission conditions and competition level among trees in different degrees. Conclusion: The thinning intensity could be controlled by adjusting the coefficient of light competition using cutting trees selection method based on crown overlap and crown light competition height. The coefficient of canopy light competition could be used as a constraint for selecting cutting trees of crop tree management. However, the thinning objects and thinning methods should be determined according to the stand characteristics and operation requirements.

Key words: crop tree management, cutting trees, coefficient of light competition, Winter Olympics core area, spatial structure, tending

CLC Number:

S750

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.

Figures/Tables 6

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References 0

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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
标准地号Plot code	树种组成Composition oftree species	株数Stem number/hm^?2	郁闭度Canopy cover	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

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
标准地号Plot code	株数Stem number	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

指标Parameters	伐前Before cutting	伐后After cutting
指标Parameters	伐前Before 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
$ \overline{W} $	0.462±0.043	0.477±0.049	0.477±0.064	0.53±0.047	0.545±0.032	0.523±0.019
$ \overline{W} $ 变化幅度Change range of $ \overline{W} $ (%)	—	3.22	3.22	14.69	17.93	13.17
$ \overline{M} $	0.114±0.103	0.129±0.124	0.152±0.142	0.159±0.14	0.174±0.149	0.174±0.149
$ \overline{M} $ 变化幅度Change range of $ \overline{M} $ (%)	—	13.16	33.33	39.47	52.63	52.63
$ \overline{C} $	0.955±0.019	0.864±0.098	0.735±0.139	0.614±0.17	0.508±0.187	0.530±0.198
$ \overline{C} $ 变化幅度Change range of $ \overline{C} $ (%)	—	?9.52	?23.02	?35.71	?46.83	?44.44
$ \overline{S} $	0.419±0.103	0.419±0.103	0.467±0.123	0.49±0.101	0.485±0.108	0.500±0.087
$ \overline{S} $ 变化幅度Change range of $ \overline{S} $ (%)	—	0	11.46	16.95	15.75	19.33
$\overline{a{\rm{CI}}}$	0.454±0.01	0.433±0.003	0.425±0.004	0.42±0.006	0.419±0.005	0.416±0.008
$\overline{a{\rm{CI}}}$ 变化幅度Change range of $\overline{a{\rm{CI}}}$ (%)	—	?4.63	?6.39	?7.49	?7.71	?8.37

指标Parameters	伐前Before cutting	伐后After cutting
指标Parameters	伐前Before 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
$ \overline{W} $	0.459±0.024	0.456±0.027	0.455±0.032	0.467±0.032	0.473±0.025	0.469±0.027
$ \overline{W} $ 变化幅度Change range of $ \overline{W} $ (%)	—	?0.65	?0.87	1.74	3.05	2.18
$ \overline{M} $	0.106±0.082	0.116±0.088	0.123±0.091	0.128±0.093	0.132±0.096	0.135±0.098
$ \overline{M} $ 变化幅度Change range of $ \overline{M} $ (%)	—	9.43	16.04	20.75	24.53	27.36
$ \overline{C} $	0.918±0.032	0.873±0.05	0.828±0.048	0.782±0.057	0.764±0.059	0.758±0.062
$ \overline{C} $ 变化幅度Change range of $ \overline{C} $ (%)	—	?4.90	?9.80	?14.81	?16.78	?17.43
$ \overline{S} $	0.362±0.025	0.348±0.028	0.346±0.034	0.349±0.031	0.353±0.029	0.357±0.026
$ \overline{S} $ 变化幅度Change range of $ \overline{S}\left(\mathrm{\%}\right) $	—	?3.87	?4.42	?3.59	?2.49	?1.38
$\overline{a{\rm{CI}}}$	0.545±0.014	0.541±0.019	0.539±0.02	0.538±0.021	0.537±0.023	0.536±0.023
$ \overline{a{\rm{CI}}} $ 变化幅度Change range of $ \overline{a{\rm{CI}}} $ (%)	—	?0.73	?1.10	?1.28	?1.47	?1.65

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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

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