Characteristics of stump stock and decomposition in Pinus massoniana plantation

doi:10.17521/cjpe.2015.0313

Abstract

Abstract: Aims

Stump plays crucial roles in maintaining soil fertility, sequestering carbon, nursing biodiversity, and conserving soil and water in plantation ecosystems. However, little is known about the decay of stump and the related roots in Pinus massoniana plantations. This study aims to explore the characteristics of stump stock and decomposition in the P. massoniana plantation.

Methods

Based on log file records of P. massoniana plantation from Laifu Forestry Management Institute in Yibin City of Sichuan Province, we established a chronosequence of decaying P. massoniana stumps from 1999 to 2013. We then investigated the stock and density of stump wood (SW), bark (B), stomp root (SR), and linked roots with different diameters (R1: 0 mm < diameter ≤10 mm; R2: 10 mm < diameter ≤25 mm; R3: 25 mm < diameter ≤100 mm; R4: diameter > 100 mm).

Important findings

In the investigated P. massoniana plantations, the stump stocks ranged from 5 to 58 t·hm^-2, stocks in stump wood was the largest, in stump root as the second, and in bark was the smallest, which decreased with the decomposing time. Correspondingly, stump density decreased with decomposing time, while the changes in density varied with stump wood, stump root and roots with different diameters. The decomposition constants of stump wood, bark and stump root were estimated at 0.061, 0.027 and 0.036, respectively. The decomposition constants of roots were estimated to be 0.079 for R1, 0.042 for R2, 0.047 for R3 and 0.119 for R4, respectively. In conclusion, the P. massoniana plantation has a high stock, but decomposes slowly and the decomposition constant varies greatly with stump components in the P. massoniana plantation, which provides certain theoretical basis for the sustainable management of P. massoniana plantation in the region.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201605004

Key words: Pinus massoniana plantation, stump, decomposition sequence, stock, decomposition characteristics

Qin WANG, Wan-Qin YANG, Fu-Zhong WU, Jian ZHANG, Bo TAN, Xi-Tao ZHANG. Characteristics of stump stock and decomposition in Pinus massoniana plantation[J]. Chin J Plant Ecol, 2016, 40(5): 458-468.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0313

https://www.plant-ecology.com/EN/Y2016/V40/I5/458

Figures/Tables 11

Table 1 The basic information of sampling plots

样地 Sampling plot	坡向/坡度 Aspect/Slope (°)	伐桩密度 Stump density (株·hm^-2)	根桩直径(平均值±标准误差) Stump diameter (mean ± SE) (cm)	土壤pH值 pH value	土壤容重 Soil bulk density (g·cm^-3 )	土壤有机质含量 Soil organic matter content (g·kg^-1)
S1	NW/21	2 050	16.4 ± 0.48	4.16	1.42	29.92
S2	NW/18	2 315	15.9 ± 0.65	4.14	1.39	28.96
S3	NW/20	2 100	17.2 ± 0.53	4.17	1.46	27.64
S4	NW/21	2 070	16.6 ± 0.44	4.14	1.40	27.44
S5	NW/17	2 405	15.6 ± 0.56	4.15	1.44	28.35
S7	NW/20	2 150	16.2 ± 0.39	4.16	1.41	27.43
S8	NW/19	2 190	16.4 ± 0.41	4.16	1.43	27.49
S9	NW/20	2 130	16.3 ± 0.47	4.18	1.45	27.64
S10	NW/18	2 350	15.9 ± 0.62	4.16	1.42	28.23
S11	NW/19	2 200	16.1 ± 0.32	4.15	1.44	28.06
S12	NW/20	2 085	17.1 ± 0.54	4.15	1.43	28.62
S13	NW/21	2 070	16.7 ± 0.29	4.16	1.39	29.26
S14	NW/20	2 125	16.8 ± 0.51	4.15	1.42	30.46
S15	NW/17	2 380	15.8 ± 0.48	4.15	1.40	31.45

Fig. 1 Changes in stump stocks of Pinus massoniana plantations across a decomposition series (mean ± SE, n = 3). Different lowercase letters mean the level of significant differences among different decomposition years (p < 0.05).

Fig. 2 Changes in stump wood, bark and stump root stocks with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). Different lowercase letters mean the level of significant differences among different decomposition years (p < 0.05), and different uppercase letters indicate the level of significant differences among different stump parts (p < 0.05). B, bark; SR, stump root; SW, stump wood.

Fig. 3 Changes in the relative ratios among stump wood, stump bark and stump root with stump decomposition in the Pinus massoniana plantations (mean ± SE). B, bark; SR, stump root; SW, stump wood.

Fig. 4 Changes in stump root stocks with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). Different lowercase letters mean the level of significant differences among different decomposition years (p < 0.05).

Fig. 5 Changes in different class root decomposition stocks with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). Different lowercase letters mean the level of significant differences among different decomposition years (p < 0.05), and different uppercase letters indicate the level of significant differences among different stump parts (p < 0.05). R1, 0 mm < diameter ≤10 mm; R2, 10 mm < diameter ≤25 mm; R3, 25 mm < diameter ≤100 mm; R4, diameter >100 mm.

Fig. 6 Changes in stump wood, bark and stump root density with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). B, bark; SR, stump root; SW, stump wood.

Fig. 7 Changes in different class root decomposition density with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). R1, 0 mm < diameter ≤10 mm; R2, 10 mm < diameter ≤25 mm; R3, 25 mm < diameter ≤100 mm; R4, diameter > 100 mm.

Table 2 The density (Y) of different components and the logarithmic function equation of time (t) in stump decomposition process

树桩的部位 Parts of the stump	对数函数方程 Logarithmic function equation	r
树皮 Barks	Y = -0.0051ln(t) + 0.4778	0.001 3
木桩 Stump wood	Y = -0.1989ln(t) + 0.8153	0.567 9
根桩 Stump root	Y = -0.1444ln(t) + 0.6522	0.237 9
0 mm <径级 Diameter ≤10 mm	Y = -0.1470ln(t) + 0.6937	0.271 4
10 mm <径级 Diameter ≤25 mm	Y = -0.0352ln(t) + 0.5470	0.016 1
25 mm <径级 Diameter ≤100 mm)	Y = -0.1043ln(t) + 0.5951	0.241 5
径级 Diameter > 100 mm)	Y = -0.4042ln(t) + 1.2127	0.724 1

Fig. 8 Changes in stump wood, bark and stump root decomposition rate with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). B, bark; SR, stump root; SW, stump wood.

Fig. 9 Changes in different class root decomposition rate with stump decomposition in the Pinus massoniana plantations (mean ± SE, n = 3). R1, 0 mm < diameter ≤10 mm; R2, 10 mm < diameter ≤25 mm; R3, 25 mm < diameter ≤100 mm; R4, diameter > 100 mm.

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