不同林分密度青海云杉林碳氮储量及其分配格局

doi:10.12118/j.issn.1000-6060.2022.481

Abstract

Abstract:

This study investigated the carbon and nitrogen sequestration capacity and the recycling and influence mechanisms of the Picea crassifolia forest ecosystem in the Qilian Mountains, northwest China. The stand densities of 350 plants·hm⁻², 850 plants·hm⁻², 1000 plants·hm⁻², 1400 plants·hm⁻², 1600 plants·hm⁻², 1950 plants·hm⁻², 2100 plants·hm⁻², 2300 plants·hm⁻², and 3000 plants·hm⁻² of P. crassifolia forest were considered for field investigation, sample collection and analysis, carbon and nitrogen storage, and allocation patterns of the P. crassifolia forest ecosystem. The results revealed that: (1) The mean carbon content value of the arbor layer in the P. crassifolia forest was 497.11 g·kg⁻¹, and the nitrogen content was 4.43 g·kg⁻¹. The allocation patterns of the carbon content in each organ followed the order of stem>root>leaf>branch>bark, and the distribution pattern of nitrogen content was leaf>branch>root>bark>trunk. The carbon and nitrogen content of the understorey vegetation layer generally exhibited a sequence of shrub layer>herb layer>litter layer, and the aboveground part>underground part. The content of carbon and nitrogen in the soil layer decreased with the increase in the stand density and decreased with the increase in the soil depth. (2) The carbon storage of the P. crassifolia forest ecosystem revealed a two-peak pattern distribution with the increase in the stand density. Nitrogen storage first increased and subsequently fluctuated with the increase in the stand density. When the density was 850 plants·hm⁻², carbon and nitrogen storage were the highest (500.76 t·hm⁻²and 25.00 t·hm⁻², respectively), and when the density was 3000 plants·hm⁻², the carbon and nitrogen storage were the lowest (315.52 t·hm⁻² and 12.52 t·hm⁻², respectively). With the increase in the stand density, the proportion of vegetation carbon and nitrogen storage gradually increased, and the proportion of soil carbon and nitrogen storage gradually decreased. The allocation patterns of carbon storage followed the order of the soil layer (73.53%)>tree layer (17.03%)>understory layer (9.44%), and nitrogen storage followed the soil layer (87.63%)>understory layer (9.90%)>tree layer (2.47%). (3) The results revealed that the stand density is closely related to forest carbon and nitrogen storage and allocation patterns. Low density (850 plants·hm⁻²) can improve carbon and nitrogen sequestration capacities of vegetation and soil, which is the best retention density of middle-aged P. crassifolia forest in the Qilian Mountains. The results provide a scientific basis for explaining the influence of the stand density on the carbon and nitrogen sequestration capacity of forest ecosystems and the structural management of forests.

Key words: stand density, Picea crassifolia forest, carbon and nitrogen storage, Qilian Mountains

FENG Yiming, LYU Chunyan, WANG Ling, ZHAO Weijun, MA Xue’e, DU Junlin, HE Junling. Carbon and nitrogen storage and allocation patterns of Picea crassifolia forest with different stand density[J].Arid Land Geography, 2023, 46(7): 1133-1144.

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References 37

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林分密度/株·hm^-2	样地数量	海拔/m	平均胸径/cm	平均树高/m	坡向	坡位	坡度/(°)	郁闭度
350	3	2880	15.61±1.32	8.93±1.76	NE	上坡	34	0.35
850	3	2855	20.58±3.53	12.68±0.47	NE	中坡	35	0.66
1000	3	2800	17.33±2.33	10.44±2.42	NE	中下	25	0.60
1400	3	2900	14.10±0.87	9.49±1.19	N	中下	25	0.67
1600	3	2800	14.09±0.39	9.69±0.68	N	中坡	28	0.58
1950	3	2900	15.04±0.28	12.41±1.68	N	中坡	26	0.84
2100	3	2800	11.88±0.52	8.36±0.81	N	下坡	25	0.69
2300	3	2861	12.36±0.66	8.75±0.77	N	中坡	22	0.78
3000	3	2872	10.37±0.59	7.75±1.12	NE	下坡	35	0.69

器官	相对生长方程	相关系数（r）
干	W_S=0.0478(D²H)^0.8665	0.9887
枝	W_B=0.0122(D²H)^0.8905	0.9568
叶	W_L=0.2650(D²H)^0.4701	0.8622
根	W_R=3.3756(D²H)^0.2725	0.9707
皮	W_P=0.0100D^2.0983H^0.2566	0.9168

林分密度/株·hm^-2	碳库/t·hm^-2			氮库/t·hm^-2
林分密度/株·hm^-2	植被	土壤	生态系统	植被	土壤	生态系统
350	52.80±3.99d	435.65±8.01a	488.44±8.06a	1.46±0.15e	23.20±0.71a	24.66±0.72a
850	111.04±4.03b	389.72±3.78b	500.76±5.37a	1.93±0.11d	23.07±0.07a	25.00±0.12a
1000	100.08±3.68c	370.05±15.66b	470.13±16.03a	1.95±0.11d	18.12±1.01b	20.07±1.03c
1400	104.51±2.37bc	335.93±7.11c	440.43±7.32b	2.11±0.09cd	21.75±0.36a	23.85±0.36a
1600	113.19±2.81b	308.82±27.56c	422.00±26.91b	2.52±0.08bc	13.14±0.51c	15.66±0.49d
1950	162.14±2.69a	303.45±7.18c	465.59±7.68ab	3.22±0.08a	18.82±0.23b	22.03±0.24b
2100	108.58±3.42bc	216.94±3.08d	325.52±5.28c	2.77±0.17b	10.71±0.52d	13.47±0.53e
2300	109.61±5.26bc	216.04±6.98d	325.65±8.65c	2.19±0.28cd	13.79±0.01c	15.98±0.28d
3000	99.47±2.25c	216.05±4.41d	315.52±5.80c	1.78±0.12de	10.74±0.01d	12.52±0.12e

Carbon and nitrogen storage and allocation patterns of Picea crassifolia forest with different stand density

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