针阔混交林生物量稳定性驱动因子

doi:10.11707/j.1001-7488.20221117

Abstract

Abstract:

Objective: The objective was to investigate the effects of biodiversity, DBH structure and topography on the temporal stability of biomass and clarify the main driving factors for the temporal stability of biomass at different spatial scales. Method: Based on two large fixed sample plots in Jiaohe, Jilin, the influences of different spatial scales was quantitatively analyzed by randomly sampling 20 m×20 m, 40 m×40 m, and 60 m×60 m plots. Three types of nested models were constructed using generalized additive models: stability~biodiversity + DBH structure (model 1), stability-biodiversity + topographic factors (model 2), stability-biodiversity + DBH structure + topographic factors (model 3), and compared with stability~biodiversity (model 0). The relative contributions of different explanatory factors are evaluated by the variation of Akaike information criterion (△AIC), the variation of Bayesian information criterion (△BIC), the variation of adjusted determination coefficient (△R_adj²) and the variation of deviance explained (△DE). Result: The analysis of the generalized additive model shows that at the three scales of 20 m×20 m, 40 m×40 m, and 60 m×60 m, the relative contribution rates of biodiversity are 15.18%, 12.66%, and 47.64%, respectively; the relative contribution rates of DBH structure are 11.30%, 72.38%, and 23.48%, respectively; the relative contribution rates of topography are 73.52%, 14.96%, and 28.88%, respectively. Biodiversity and DBH structure are only significantly correlated with the temporal stability of biomass on the 60 m×60 m scale (P < 0.05). Among them, species richness and Faith phylogenetic diversity index are significantly negatively correlated with the temporal stability of biomass. The maximum diameter at breast height and basal area per hectare are significantly positively correlated with the temporal stability of biomass, and the coefficient of variation of diameter at breast height is significantly negatively correlated with the temporal stability of biomass. Among the topographic factors, the aspect is significantly related to the temporal stability of biomass at the 20 m×20 m scale, and the elevation and slope are significantly related to the temporal stability of biomass at the 60 m×60 m scale. The explanation rate of the deviation of the above explanatory variables on the temporal stability of biomass increases with the spatial scale. The driving factor for the temporal stability of volume is basically the same as the temporal stability of biomass. Conclusion: The relative influences of topographic factors, DBH structure and biodiversity have significant scale effects on the temporal stability of biomass and shift along different spatial scales. Topographical factors play a major role in the temporal stability of biomass at the scale of 20 m×20 m. DBH structure plays a major role in the temporal stability of biomass at the scale of 40 m×40 m and biodiversity plays a major role in the temporal stability of biomass at the scale of 60 m×60 m. The results provide a theoretical basis for improving the stability of the northeast coniferous and broad-leaved mixed forest ecosystem.

Key words: temporal stability of biomass, biodiversity, DBH structure, topography, spatial scale

CLC Number:

S757.1

Shuijin Yu,Juan Wang,Haiyan He,Chunyu Zhang,Xiuhai Zhao. Driving Factors of the Temporal Stability of Biomass of Mixed Broadleaf-Conifer Forest[J]. Scientia Silvae Sinicae, 2022, 58(11): 181-190.

Figures/Tables 7

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Table 1

The effect of the increase of other variables on the temporal stability of biomass and volume in the basic models"

响应变量 Response	空间尺度 Spatial scale	基础模型 Base model	添加变量 Added variable	ΔAIC	ΔBIC	ΔR_adj²	ΔDE (%)
生物量稳定性 Temporal stability of biomass	20 m×20 m	生物多样性Biodiversity	胸径结构DBH structure	2.162	14.202	0.021	6.50
		生物多样性Biodiversity	地形因子Topography	-10.712	10.116	0.163	22.40
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+topography	-10.866	12.244	0.163	22.20
	40 m×40 m	生物多样性Biodiversity	胸径结构DBH structure	-21.595	7.544	0.265	33.40
		生物多样性Biodiversity	地形因子Topography	2.296	12.186	0.012	4.90
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+topography	2.101	11.803	0.006	3.20
	60 m×60 m	生物多样性Biodiversity	胸径结构DBH structure	-2.480	6.764	0.039	5.90
		生物多样性Biodiversity	地形因子Topography	4.764	11.948	-0.016	0.50
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+ topography	3.108	15.179	0.005	3.50
蓄积量稳定性 Temporal stability of volume	20 m×20 m	生物多样性Biodiversity	胸径结构DBH structure	3.691	11.703	-0.008	2.26
		生物多样性Biodiversity	地形因子Topography	-7.085	12.175	0.125	18.32
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+ topography	-7.954	15.477	0.142	20.76
	40 m×40 m	生物多样性Biodiversity	胸径结构DBH structure	-18.694	5.706	0.228	28.82
		生物多样性Biodiversity	地形因子Topography	-2.388	5.925	0.050	7.72
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+ topography	1.575	11.564	0.011	3.80
	60 m×60 m	生物多样性Biodiversity	胸径结构DBH structure	-4.149	3.873	0.047	6.40
		生物多样性Biodiversity	地形因子Topography	-0.541	3.181	0.013	2.20
		生物多样性Biodiversity	胸径结构+地形因子 DBH structure+ topography	-0.660	2.905	0.012	1.90

Table 1

Table 2

References 0

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空间尺度 Spatial scale	预测因子 Predictors			生物量稳定性 Temporal stability of biomass				蓄积量稳定性 Temporal stability of volume
空间尺度 Spatial scale	生物多样性 Biodiversity	胸径结构 DBH Structure	地形因子 Topography	AIC	BIC	R_adj²	DE(%)	AIC	BIC	R_adj²	DE(%)
20 m×20 m	√			289.680	304.666	0.007	4.50	287.593	303.282	0.030	6.98
	√	√		291.842	318.869	0.028	11.00	291.284	314.985	0.022	9.24
	√		√	278.968	314.782	0.170	26.90	280.508	315.458	0.155	25.30
	√	√	√	280.976	331.113	0.191	33.20	283.330	330.463	0.164	30.00
		√		291.627	307.589	-0.009	3.35	288.953	303.312	0.012	4.74
			√	280.586	309.824	0.138	21.80	281.347	306.603	0.120	18.80
		√	√	283.901	323.063	0.138	25.10	282.445	320.143	0.146	25.40
40 m×40 m	√			289.636	306.626	0.015	6.00	287.526	303.976	0.034	7.58
	√	√		268.041	314.170	0.280	39.40	268.832	309.682	0.262	36.40
	√		√	291.932	318.812	0.027	10.90	285.138	309.900	0.084	15.30
	√	√	√	270.142	325.973	0.286	42.60	270.407	321.245	0.273	40.20
		√		266.375	299.769	0.263	34.30	267.333	294.618	0.240	30.50
			√	287.350	302.880	0.032	7.09	279.608	295.468	0.105	14.20
		√	√	266.772	311.342	0.286	39.50	266.605	306.513	0.277	37.40
60 m×60 m	√			258.105	282.673	0.300	35.30	258.207	281.673	0.297	34.70
	√	√		255.625	289.437	0.339	41.20	254.058	285.546	0.344	41.10
	√		√	262.870	294.621	0.284	35.80	257.666	284.854	0.310	36.90
	√	√	√	258.733	304.616	0.344	44.70	253.398	288.451	0.356	43.00
		√		274.697	288.989	0.143	17.40	267.247	284.242	0.213	24.90
			√	272.902	291.413	0.171	21.40	262.434	280.659	0.253	29.10
		√	√	268.947	299.511	0.236	31.10	257.366	284.678	0.312	37.10

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Driving Factors of the Temporal Stability of Biomass of Mixed Broadleaf-Conifer Forest

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