不同造林密度马尾松人工林分化特征及其对生产力的影响

doi:10.11707/j.1001-7488.LYKX20220104

Abstract

Abstract:

Objective: To study the characteristics of individual differentiation and its impact on productivity in the growth process of different densities of Pinus massoniana, it provides a basis for determining suitable management densities, cultivating large-diameter woods and improving stand productivity in P. massoniana forests. Method: Based on 15 continuous years observation data of four kinds of P.massoniana plantations with planting density of 2 500, 3 333, 4 500 and 6 000 plants·hm^?2 (denoted as: A, B, C, D), and random forests and structural equations were used to explore the influence of forest age, planting density and self-thinning process on individual differentiation and productivity of P. massoniana forests. Result: Gini coefficient (individual size differentiation) decreased significantly with increasing stand age and increased significantly with increasing density. In the process of stand self-thinning, the number of standing trees decreased significantly with the increase of stand age, and the self-thinning rate fluctuated and increased significantly with the increase of stand density. The A density (2 500 tree·hm^?2) is the first to reach 25% of the large diameter wood (21 years old) and 50% of the medium diameter wood (17 years old) compared with other densities. The stand volume increased logarithmically with the increase of stand age of P. massoniana, and the increase order in 15 years was A (420.03 m³·hm^?2) > C (202.51 m ³·hm^?2) > B (186.76 m ³·hm^?2) > D (148.95 m ³·hm^?2), the stand productivity increased first and then decreased and tended to be stable. The stand age, planting density and the number of living standing trees have significant effects on Gini coefficient and stand productivity, among which stand age has a significant negative effect on Gini coefficient, and planting density has a significant positive effect. The effect of stand age and planting density on stand productivity was mainly through the indirect effect of “stand age-number of living standing trees-stand productivity, planting density-Gini coefficient-stand productivity”. Conclusion: At density A (2 500 tree·hm^?2), the individual differentiation degree is small and the high productivity level of the P. massoniana stand, which is suitable for the cultivation of medium and large diameter wood in the south subtropical region of P. massoniana plantations.

Key words: Pinus massoniana, planting density, stand growth, diameter order distribution, structural equation

CLC Number:

S757

Peidong Yan,Peng Li,Zhangqi Yang,Suili Huang,Yongbin Zhou,Tianwang Ling. Differentiation Characteristics and Their Effects on Productivity with Different Planting Densities of Pinus massoniana Plantations[J]. Scientia Silvae Sinicae, 2023, 59(10): 66-75.

Figures/Tables 10

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林龄 Age /a	林分类型 Stand type	造林密度 Planting density/ (tree·hm^?2)	林分密度 Stand density/ (tree·hm^?2)	平均胸径（胸径范围） Mean DBH (DBH_min ~DBH_max) /cm	平均树高（树高范围） Mean tree height (H_min ~H_max) /m	林分蓄积量 Stand volume/ (m³·hm^?2)
10	A	2 500	2 409±60	11.82±3.64(5.4~20.1)	10.81±1.76(6.0~13.8)	169.76±29.82
	B	3 333	2 685±40	10.74±3.96(4.8~19.0)	10.84±2.07(5.5~15.3)	160.72±25.57
	C	4 500	3 759±148	10.22±3.53(4.5~20.5)	10.51±1.93(5.5~14.5)	203.15±25.69
	D	6 000	4 524±121	9.37±2.94(4.5~18.8)	10.15±1.94(5.1~15.0)	196.56±26.15
24	A	2 500	2 409±60	23.56±5.21(15.3~35.5)	20.72±3.03(11.9~25.2)	420.03±17.42
	B	3 333	2 685±40	23.64±5.48(14.8~38.7)	21.23±2.52(15.6~26.1)	360.62±27.86
	C	4 500	3 759±148	23.97±5.70(12.9~39.0)	20.74±3.41(13.0~27.5)	405.66±37.65
	D	6 000	4 524±121	22.24±5.28(13.6~33.8)	20.51±2.93(11.8~25.2)	345.51±12.39

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Differentiation Characteristics and Their Effects on Productivity with Different Planting Densities of Pinus massoniana Plantations

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