祁连山南坡青海云杉林碳密度随海拔分布特征

doi:10.13866/j.azr.2023.04.10

Abstract

Abstract:

Forest biomass is the basis for studying forest primary productivity, and its carbon density is a crucial indicator for evaluating the structure and function of forest ecosystem. To study changes in the stand density of Qinghai spruce with altitude in Amidongsoe small watershed on the southern slope of Qilian Mountains, a biomass model was used to calculate the carbon density of arbor and soil layers along an altitude gradient of 2900-3200 m at different altitudes. The aim of this study was to gather basic data for estimating carbon storage in spruce forests in the Qilian Mountains and Qinghai Province. The results demonstrated that the average value of total biomass in the study area was 135.59 t·hm^-2 and the total biomass decreased as the altitude increased. The average carbon density of tree layer was 70.51 t·hm^-2, and the average organic carbon density of the 0-50 cm soil layer was 154.01 t·hm^-2. As the altitude increased, the carbon density of the tree layer exhibited a decreasing trend, and the soil organic carbon density of the tree layer initially decreased and then increased. At different elevations, the carbon density of spruce forest ecosystem was 224.51 t·hm^-2, with the carbon density of the tree and soil layers accounting for 30.5% and 69.5% of the total carbon density, respectively. The layers showed a decreasing trend as the altitude increased. Protecting forest soil is crucial for maintaining ecological balance, as the forest soil carbon pool represents a considerable proportion of the total carbon density.

Key words: southern slope of Qilian Mountains, Qinghai spruce forest, biomass, carbon density

QIU Xunxun, CAO Guangchao, ZHANG Jinhu, ZHANG Zhuo, LIU Menglin. Distribution characteristics of carbon density in the arbor and soil layers of Qinghai spruce forest on the southern slope of Qilian Mountains with altitude[J].Arid Zone Research, 2023, 40(4): 615-622.

Figures/Tables 8

Tab. 1

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林分类型	海拔 /m	样地数量 /个	郁闭度	平均胸径 /cm	平均株高 /m	样地株数 /株	样品数量 /个
青海云杉 Picea crassifolia	2900	3	0.6	35.45	12.45	14	15
	3000	3	0.7	23.7	11.2	24	15
	3100	3	0.7	27.55	11.45	11	15
	3200	3	0.5	20.45	10.62	9	15

器官	相对生长方程	R²	器官	相对生长方程	R²
干	W_S=0.957×D^1.591	0.876	根	W_R=0.220×D^1.858	0.967
叶	W_L=0.001×D^3.067	0.722	总量	W_T=0.959×D^1.803	0.953
枝	W_B=0.012×D^2.448	0.815

海拔/m	生物量/kg				总生物量 /(t·hm^-2)	乔木层碳密度 /(t·hm^-2)
海拔/m	干	叶	枝	根	总生物量 /(t·hm^-2)	乔木层碳密度 /(t·hm^-2)
2900	279.62±14.42A	56.77±5.63A	74.72±5.92A	166.71±10.03A	208.14±2.71A	108.23±1.41A
3000	147.46±11.86AB	16.59±2.56B	27.96±3.45B	78.99±7.41AB	177.5±15.76AB	92.3±10.27AB
3100	191.53±22.12AB	30.24±8.21AB	43.78±12.11AB	108.42±13.21AB	104.11±12.06BC	54.14±6.69BC
3200	116.48±1.36B	10.47±0.24B	19.4±0.35B	59.94±0.82B	52.6±3.46C	27.35±1.8C
平均值	183.76±26.62	28.52±7.65	41.47±9.09	103.52±17.47	135.59±24.15	70.51±12.56

海拔/m	不同土层/cm					合计/(t·hm^-2)
海拔/m	0~10	10~20	20~30	30~40	40~50	合计/(t·hm^-2)
2900	34.55±3.85Aa	27.8±5.44Ba	35.37±5.63Aa	27.02±6.43Aa	19.71±1.08Aa	144.49±3.07A
3000	33.82±5.2Aa	27.82±1.65Ba	22.54±0.69Aa	25.86±3.27Aa	24.28±0.59Aa	134.33±2.42A
3100	47.55±2.94Aab	53.51±1.12Aa	42.84±2.64Ab	16.46±1.11Ac	9±4.42Ac	169.36±5.98A
3200	32.18±0.18Aa	44.39±9.91ABa	27.12±1.04Aa	36.88±1.13Aa	27.27±5.96Aa	167.84±3.17A
平均值	37.03±3.27	38.38±4.7	31.97±3.76	26.55±3.49	20.07±3.57	154.01±9.57

	海拔	平均胸径	郁闭度	乔木层碳密度	土壤有机碳密度	土壤有机碳含量
海拔	1
平均胸径	-0.878^**	1
郁闭度	-0.765^*	0.518	1
乔木层碳密度	-0.976^**	0.905^**	0.735^*	1
土壤有机碳密度	0.39	-0.214	-0.361	-0.429	1
土壤有机碳含量	-0.342	0.119	0.602	0.381	0.024^**	1

Distribution characteristics of carbon density in the arbor and soil layers of Qinghai spruce forest on the southern slope of Qilian Mountains with altitude

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