Effects of strip cutting on aboveground biomass accumulation and allocation, and allometric growth of Phyllostachys edulis

doi:10.12302/j.issn.1000-2006.202012006

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5): 19-24.doi: 10.12302/j.issn.1000-2006.202012006

Special Issue: 专题报道

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Effects of strip cutting on aboveground biomass accumulation and allocation, and allometric growth of Phyllostachys edulis

WANG Shumei(), FAN Shaohui, XIAO Xiao, ZHENG Yaxiong, ZHOU Yang, GUAN Fengying^*()

Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo & Rattan Science and Technology, Beijing 100102,China

Received:2020-12-03 Accepted:2021-02-28 Online:2021-09-30 Published:2021-09-30
Contact: GUAN Fengying E-mail:wsmpaper@163.com;guanfy@icbr.ac.cn

Abstract

Abstract:

【Objective】 Strip cutting of moso bamboo forests can realize their mechanized management. We aimed to provide a scientific basis for the reasonable management of bamboo strip cutting, biomass allocation and allometric growth of Phyllostachys edulis with different cutting widths. 【Method】 Whole forest clear-cutting of P. edulis forests of different widths was conducted in December 2019. The number of new bamboos, diameter at breast height (DBH), clear bole height and height of the bamboo at different cutting widths (0, 3, 9 and 15 m) were counted in August 2020. The biomass of branches, leaves and stems of new bamboo were investigated, and the biomass allocation characteristics and allometric growth relationship of aboveground components were analyzed. 【Result】 Strip cutting increased the number of new bamboos: the trend was first increase and then decrease, and the number reached the maximum value in the 9 m cutting width. With the increase in cutting width, the bamboo height (CBH), DBH, clear bole height, and ratio of CBH to DBH of new bamboo decreased, and the fresh branch, leaf, stem weight and total biomass decreased significantly. Strip cutting could improve the leaf strength and ratio of bamboo height to DBH of P. edulis, especially the proportion of leaf distribution and leaf relative biomass. Strip cutting did not change the isokinetic growth relationship between the stem-total biomass of P. edulis but significantly affected the relative growth rate of branch-total biomass and leaf-total biomass, which changed from allometric growth to isokinetic growth.【Conclusion】 The results showed that strip cutting balanced resource allocation among the components through physiological integration, the allometric growth relationship was changed, and the morphological plasticity of new bamboo was induced.

Key words: Phyllostachys edulis, strip cutting, biomass allocation, allometric growth

CLC Number:

S714

WANG Shumei, FAN Shaohui, XIAO Xiao, ZHENG Yaxiong, ZHOU Yang, GUAN Fengying. Effects of strip cutting on aboveground biomass accumulation and allocation, and allometric growth of Phyllostachys edulis[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(5): 19-24.

Figures/Tables 5

Table 1

Fig.1

Table 2

Table 3

Fig.2

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处理 treatment	新竹数量/ (株·hm^-2) number of new bamboo	胸径/cm DBH	枝下高/m CBH	竹高/m bamboo height	枝下高与胸径比 ratio of CBH to DBH	竹高与胸径比 ratio of bamboo height to DBH
CK	884±128.29 b	9.96±0.53 a	6.45±0.47 a	12.07±0.48 a	0.65±0.01 a	18.66±0.37 c
M3	1 000±166.67 b	8.55±0.32 b	3.15±0.52 b	9.95±0.20 b	0.37±0.05 b	27.33±2.74 a
M9	1 926±250.51 a	7.76±0.08 c	3.12±0.17 b	9.50±0.06 b	0.40±0.02 b	23.65±1.21 b
M15	1 323±443.89 b	5.87±0.26 d	2.40±0.21 c	7.58±0.09 c	0.41±0.04 b	18.66±2.01 c

处理 treatments	出叶强度 leafing intensity	相对生物量/(kg·cm^-1) relative biomass
处理 treatments	出叶强度 leafing intensity	枝branch	叶leaf	秆stem	总生物量total biomass
CK	1.10±0.06 d	0.34±0.02 a	0.38±0.03 b	2.80±0.08 a	3.52±0.10 a
M3	1.34±0.08 c	0.28±0.02 b	0.38±0.02 b	2.34±0.07 b	3.00±0.09 b
M9	1.54±0.07 b	0.24±0.01 c	0.37±0.01 b	2.38±0.07 b	3.00±0.07 b
M15	2.23±0.15 a	0.18±0.01 d	0.41±0.02 a	1.64±0.03 c	2.23±0.06 c

参数 parameter	处理 treatment		相关生长指数 scaling exponent								等速生长检验 test of isometry				共同斜率 common slope
参数 parameter	处理 treatment		R²		P		斜率 slope		95%置信区间 95% CI		F		P		斜率 slope	P
枝(y) - 总生物量(x) branch(y)-total biomass(x)	CK	0.649		0.009		1.698 0		1.022 0~2.820 0		6.133		0.042
	M3	0.193		0.236		1.708 0		0.819 0~3.561 0		2.733		0.142
	M9	0.679		0.006		1.047 0		0.644 0~1.704 0		0.047		0.835		2.697		0.428
	M15	0.732		0.003		1.560 0		0.997 0~2.441 0		5.519		0.051
叶(y) - 总生物量(x) leaf(y)-total biomass(x)	CK	0.368		0.083		2.385 7		1.231 3~4.622 1		10.704		0.014
	M3	0.429		0.056		1.625 7		0.863 6~3.060 3		3.127		0.120
	M9	0.653		0.008		0.979 2		0.591 0~1.622 4		0.009		0.928		5.039		0.160
	M15	0.798		0.001		1.332 0		0.900 1~1.971 3		2.922		0.131
秆(y) - 总生物量(x) stem(y)-total biomass(x)	CK	0.869		0.000		0.955 3		0.695 0~1.313 1		0.104		0.756
	M3	0.915		0.000		1.070 3		0.827 1~1.384 9		0.379		0.558
	M9	0.992		0.000		1.050 3		0.970 7~1.136 3		2.179		0.183		2.766		0.417
	M15	0.971		0.000		0.929 6		0.798 0~1.082 9		1.360		0.282

Effects of strip cutting on aboveground biomass accumulation and allocation, and allometric growth of Phyllostachys edulis

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