Initial impacts of two thinning methods on the spatial structure of Pinus massoniana plantations

doi:10.12302/j.issn.1000-2006.202107012

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5): 138-146.doi: 10.12302/j.issn.1000-2006.202107012

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Initial impacts of two thinning methods on the spatial structure of Pinus massoniana plantations

WANG Yu¹(), YI Yanling¹^,², LIU Hai¹, WEN Xiaochen¹, LI Tianyi¹, YIN Haifeng¹, LI Xianwei¹, FAN Chuan¹^,^*()

1. College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
2. People’s Government of Xinchang Town, Weiyuan Country Neijiang City of Sichuan Province, Weiyuan 641000,China

Received:2021-07-07 Revised:2023-01-19 Online:2023-09-30 Published:2023-10-10

Abstract

Abstract:

【Objective】This research aims to explore the effects of two tree thinning methods and intensities on the spatial structure of Pinus massoniana plantations, to provide a scientific basis for optimizing their structure and quality. 【Method】Two thinning methods-crop tree management and traditional tending management-with five thinning intensities (0, 100, 167, 233 and 300 trees/hm²) were established, at Damaoping State-Owned Forest Farm, an intensity of 0 trees/hm² was used as a cotrol. Next we surveyed tree species (measuring tree height, diameter at breast height and distance between neighboring trees), drew Voronoi diagrams, and calculated spatial structure parameters for each stand: mingling index(M), neighborhood comparison(U), uniform angle index(W), opening degree(K), competition index(CI) and comprehensive evaluation index(Z). 【Result】After thinning, the M parameters for crop tree and traditional tending management were heterogeneous: the former increased, while the latter did not significantly change. The W parameter increased, but the forest stands remained uniformly distributed. The forest was more randomly distributed with crop tree management than traditional tending management, while U parameters did not significantly change. Both thinning methods increased at the K parameter, which was larger for crop tree management than for traditional management. Both thinning methods saw a decrease in the CI parameter, likewise more so for traditional tending management. Finally, both crop tree and traditional management significantly improved the comprehensive evaluation indexes, which ranged from 28.8% to 65.6% and from 14.2% to 44.5%, respectively. 【Conclusion】The crop tree management was more reasonable than that of the traditional tending, with the number of target trees approximately 233 trees/hm² in the near-mature Masson pine forest.

Key words: Pinus massoniana plantation, crop tree management, traditional tending management, spatial structure of stand, cutting intensity

CLC Number:

S753
S756

WANG Yu, YI Yanling, LIU Hai, WEN Xiaochen, LI Tianyi, YIN Haifeng, LI Xianwei, FAN Chuan. Initial impacts of two thinning methods on the spatial structure of Pinus massoniana plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(5): 138-146.

Figures/Tables 5

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采伐方式 thinning type	处理 treatment	海拔/m elevation	伐前林分密度/ (株·hm^-2) density before thinning	伐后林分密度/ (株·hm^-2) density after thinning	伐前林分平均胸径/cm average DBH before thinning	伐后林分平均胸径/cm average DBH after thinning
CK	CK	700~740	1 681±51	1 681±51	17.1±0.3	17.1±0.3
目标树经营 crop tree management	T₁	700~740	1 716±49	1 522±59	16.7±0.4	16.1±0.4
	T₂	700~740	1 710±67	1 400±41	16.8±0.1	16.2±0.1
	T₃	700~740	1 638±48	1 244±31	17.2±0.6	16.8±0.6
	T₄	700~740	1 777±44	1 205±47	16.9±0.2	16.4±0.3
抚育间伐 traditional tending management	V₁	700~740	1 739±25	1 333±33	16.3±0.2	17.7±0.2
	V₂	700~740	1 655±44	1 681±57	17.1±0.5	18.4±0.5
	V₃	700~740	1 760±48	1 138±58	17.3±0.4	19.7±0.4
	V₄	700~740	1 805±91	1 000±43	16.9±0.5	18.8±0.5

Initial impacts of two thinning methods on the spatial structure of Pinus massoniana plantations

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