Effects of Thinning on the Growth of Different Age Class Pinus taiwanensis Plantations

doi:10.13466/j.cnki.lyzygl.2019.01.008

Abstract

Abstract:

With the Pinus taiwanensis plantation in the multi-functional forest management sample base of Huangbaishan Forest Farm as the object,the randomized blocks were used to set up the fixed sample plot,and the first thinning test was carried out in the young forest,including the intensive thinning(45%),moderate thinning(34%),weak thinning(23%) and control(no thinning).When the Pinus taiwanensis plantation entered on the age of the half-mature forest,near mature forest,and mature forest,the second,third and fourth thinning tests were carried out in succession,and all were carried out on the basis of the previous thinning,in which the intensive thinning(30%),moderate thinning(20%),weak thinning(10%)and control(no thinning) were done.Study was conducted on the effects of different thinning intensities on the growth of Pinus taiwanensis plantations at different ages during the cultivation period of Pinus taiwanensis plantations.The results showed that:(1)In the same age class,the growth rate of DBH,tree height,volume of individual tree,basal area and volume increased with the raising of thinning intensities.(2)The intensive and moderate thinning of young forests,and the intensive thinning of half-mature forests and near-mature forests significantly promoted the growth of DBH.The thinning of mature forests did not significantly promote the growth of DBH.(3)In any age class,thinning had no significant effect on growth of tree height.(4)The intensive and moderate thinning of young forests as well as the intensive thinning of half-mature forest and near-mature forests significantly promoted the growth of volume of individual trees,and the thinning of mature forests did not significantly promote the growth of volume of individual trees.(5)The basal area of residual trees was reduced with the increase of thinning intensities,and thinning had no significant effect on the total basal area.(6)The volume of residual trees was reduced with the increase of thinning intensities,and thinning had no significant effect on the total volume.As far as the management of Pingus taiwanensis plantation is concerned,after the young forest section of the forest was closed,the first thinning begins,and the intensity and moderate thinning are appropriate;The second and third thinning operations of middle age forest trees and near-mature forest trees are carried out,mainly by intensive thinning;The fourth thinning of mature forest section has no significant effect on the growth of Pinus taiwanensis forest and can be abandoned.

Key words: Pinus taiwanensis, thinning intensities, growth rate, age class, stand growth

CLC Number:

QIU Lin, ZHANG Jianshe, ZHENG Tiancai, WANG Xiaoyun, ZHOU Chuantao, DONG Huihui, LI Fengying, LIU Yong. Effects of Thinning on the Growth of Different Age Class Pinus taiwanensis Plantations[J]. FOREST RESOURCES WANAGEMENT, 2019, (1): 44-51.

Figures/Tables 8

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References 24

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间伐强度	坡向	坡位	坡度/(°)	郁闭度	平均胸径/cm	平均树高/m	林龄/a	密度/(株/hm²)
强度间伐	西北	中	20~23	0.85~0.90	8.9~ 9.9	5.7~6.30	14	3562~4098
中度间伐	西北	中	19~22	0.85~0.90	9.2~ 9.8	5.7~6.22	14	3512~4112
弱度间伐	西北	中	21~27	0.85~0.90	9.4~10.0	5.8~6.20	14	3601~4183
对照	西北	中	22~25	0.85~0.90	8.8~ 9.8	5.5~6.10	14	3585~4167

龄级	林龄 /a	强度间伐		中度间伐		弱度间伐		对照
龄级	林龄 /a	平均胸径/cm	生长率/%	平均胸径/cm	生长率/%	平均胸径/cm	生长率/%	平均胸径/cm	生长率/%
幼龄林	14 19	10.65±0.57 14.18±0.76	5.69±0.42a	10.53±0.46 13.50±0.69	4.94±1.65b	10.50±0.46 13.18±0.43	4.52±0.97c	9.65±0.65 12.10±0.68	4.48±0.95c
中龄林	21 27	16.25±1.09 19.13±0.74	2.71±0.38a	15.50±0.91 18.13±0.78	2.60±0.57ab	15.25±0.83 17.65±1.15	2.43±0.32ab	12.83±1.33 14.68±0.88	2.24±0.71b
近熟林	31 40	22.10±1.41 26.15±0.89	1.87±0.77a	20.65±0.71 24.23±0.85	1.77±0.35ab	19.48±0.92 22.40±0.65	1.55±0.39ab	16.28±0.77 18.55±1.16	1.45±0.40b
成熟林	43 49	28.40±0.96 30.55±1.21	1.21±0.65a	26.43±0.67 28.25±1.17	1.11±0.81a	24.10±0.69 25.48±0.93	0.93±0.67a	21.15±1.05 22.33±0.89	0.91±0.63a

龄级	林龄 /a	强度间伐		中度间伐		弱度间伐		对照
龄级	林龄 /a	平均树高/cm	生长率/%	平均树高/cm	生长率/%	平均树高/cm	生长率/%	平均树高/cm	生长率/%
幼龄林	14 19	6.13±0.86 8.53±0.99	6.56±0.66a	6.23±1.01 8.48±0.75	6.13±0.52a	6.33±0.66 8.45±0.77	5.75±0.78a	5.88±0.59 7.83±0.90	5.71±0.73a
中龄林	21 27	9.45±0.93 11.65±0.39	3.48±0.89a	9.60±0.90 11.60±1.08	3.15±0.54a	9.50±1.11 11.28±0.72	2.86±0.64a	8.68±0.78 10.25±0.63	2.77±0.68a
近熟林	31 40	13.30±0.36 14.35±0.89	0.84±0.18a	13.18±1.22 14.18±0.84	0.82±0.39a	12.98±0.68 13.95±0.74	0.81±0.46a	12.00±0.76 12.90±0.66	0.81±0.36a
成熟林	43 49	14.38±0.88 14.58±0.71	0.23±0.09a	14.28±0.91 14.45±0.50	0.21±0.15a	14.05±0.62 14.23±0.97	0.21±0.11a	13.45±0.61 13.60±0.53	0.18±0.09a

龄级	林龄 /a	强度间伐		中度间伐		弱度间伐		对照
龄级	林龄 /a	平均材积/cm	生长率/%	平均材积/cm	生长率/%	平均材积/cm	生长率/%	平均材积/cm	生长率/%
幼龄林	14 19	0.0287±0.0021 0.0570±0.0023	13.25±1.13a	0.0267±0.0033 0.0507±0.0091	12.33±1.52b	0.0268±0.0037 0.0481±0.0026	11.43±1.88c	0.0194±0.0022 0.0342±0.0097	11.11±2.40c
中龄林	21 27	0.0796±0.0112 0.1178±0.0568	6.45±0.96a	0.0719±0.0088 0.1021±0.0079	5.77±0.70ab	0.0674±0.0073 0.0941±0.0039	5.53±0.54b	0.0441±0.0059 0.0617±0.0119	5.49±0.41b
近熟林	31 40	0.1715±0.0137 0.2599±0.0097	4.56±0.28a	0.1458±0.0088 0.2132±0.0079	4.19±0.44ab	0.1271±0.0066 0.1782±0.0122	3.73±0.77b	0.0823±0.0059 0.1152±0.0069	3.71±0.52b
成熟林	43 49	0.3184±0.0311 0.3609±0.0211	2.09±0.61a	0.2645±0.0059 0.2918±0.0216	1.61±0.53a	0.2125±0.0077 0.2362±0.0155	1.76±0.36a	0.1589±0.0067 0.1764±0.0037	1.74±0.32a

龄级	林龄 /a	强度间伐		中度间伐		弱度间伐		对照
龄级	林龄 /a	断面积 /(m²/hm²)	生长率/%	断面积 /(m²/hm²)	生长率/%	断面积 /(m²/hm²)	生长率/%	断面积 /(m²/hm²)	生长率/%
幼龄林	14 19	19.25±2.13 33.37±2.70	10.77±1.18a	20.98±2.25 34.97±3.22	10.03±1.97ab	23.95±1.98 38.09±2.77	9.11±1.04b	26.70±1.97 42.31±3.75	9.03±0.88b
中龄林	21 27	29.64±2.62 37.37±2.11	3.85±0.78a	30.55±2.63 37.79±3.56	3.52±0.49ab	33.81±1.78 41.39±2.94	3.35±0.91ab	45.76±3.87 54.07±4.03	2.76±0.82b
近熟林	31 40	30.65±3.09 40.42±3.74	3.05±0.98a	36.03±3.31 45.83±4.02	2.66±0.52ab	43.19±3.36 51.46±3.88	1.94±0.66b	57.66±4.32 62.24±5.56	0.84±0.35c
成熟林	43 49	30.04±3.29 33.32±3.86	1.72±0.46a	37.71±3.05 40.84±3.35	1.33±0.38a	46.99±3.88 49.11±4.68	0.72±0.61b	62.94±5.01 63.62±4.90	0.17±0.19c