人类活动对额尔齐斯河流域碳储量的影响

doi:10.13866/j.azr.2023.08.14

Abstract

Abstract:

Carbon sequestration is among the main functions of terrestrial ecosystem services, and the carbon sequestration capacity of terrestrial ecosystems directly affects global carbon emissions and climate change processes. Human activities directly influence land use and cover change, consequently affecting the carbon sequestration function of ecosystems. The terrestrial ecosystem services in dry and cold regions are more vulnerable and significantly impacted by human activities. Therefore, utilizing land use data from the Irtysh River Basin in the Altai Mountains from 2000 to 2020, the InVEST model was used to estimate and analyze the spatial distribution of carbon stocks in the basin during different periods. Subsequently, the influence of human activities on the spatial distribution of carbon stocks was discussed. The results show the following: (1) The main land use types in the basin are woodland, grassland, and unused land, and the land use pattern changed significantly from 2000 to 2020. Cultivated land, urban and rural land, industrial and mining land, and residential land expanded continuously, increasing by 2619.35 km² and 186.68 km², respectively. Grassland and water areas initially decreased and then expanded, increasing by 4725.13 km² and 33.47 km², respectively. Meanwhile, forest land and unused land decreased continuously by 2328.88 km² and 5237.76 km², respectively. (2) During this period, the spatial distribution pattern of carbon stocks in the basin was similar and showed a zonal distribution. High-value areas were distributed in high-altitude regions where grassland and woodland were clustered, while low-value areas were distributed in low-altitude regions where unused land was clustered. In 2000, 2005, 2010, 2015, 2020 the total carbon storage in the basin was 641.60 Tg, 645.78 Tg, 646.83 Tg, 650.28 Tg, and 665.91 Tg, respectively, with an annual growth rate of 0.95%, showing an upward trend. (3) The areas in the basin where carbon storage decreased or increased showed a spot-like distribution. Furthermore, carbon storage reduction mainly occurred through the conversion of grassland to unused land and cultivated land, with an average annual reduction of 58.81 Tg. The increase in carbon storage primarily resulted from the conversion of unused land into cultivated land and grassland, with an average annual increase of 64.82 Tg. From 2000 to 2020, the net sequestration of carbon storage exceeded the net release, indicating an increasing carbon sequestration capacity in the Irtysh River Basin. Overall, the reclamation of land and grass due to human activities is the main reason for the increase in carbon storage in the basin. However, it is necessary to coordinate the development and utilization of water and soil resources, as this will guarantee not only an increased carbon sink but also the preservation of the carrying capacity of water and soil resources, ultimately achieving sustainable economic development in the Irtysh River Basin. The results of this study will help to promote the carbon cycle of the basin and the carbon sequestration capacity of the ecosystem, as well as provide a scientific basis for the establishment and management of the basin carbon pool.

Key words: human activities, carbon storage, LUCC, InVEST model, Irtysh River Basin

ZHANG Xiaomin, ZHANG Dongmei, ZHANG Wei. Effects of human activities on carbon storage in the Irtysh River Basin[J].Arid Zone Research, 2023, 40(8): 1333-1345.

Figures/Tables 8

Fig. 1

Tab. 1

Fig. 2

Tab. 2

Land use transfer matrix of Irtysh River Basin from 2000 to 2020"

2000—2005年
面积/km²	耕地	林地	草地	水域	城乡、工矿、居民用地	未利用地	2000年总计
耕地	2487.65	0.82	63.28	0.77	0.60	13.38	2566.51
林地	10.48	7934.87	3.35	1.96	0	3.90	7954.56
草地	226.95	7.43	38685.38	5.35	1.42	36.21	38962.74
水域	1.89	0	11.35	1794.52	0	38.05	1845.80
城乡、工矿、居民用地	2.29	0	0	0	105.19	0	107.47
未利用地	513.47	4.22	92.21	28.13	1.00	28689.75	29328.78
2005年总计	3242.73	7947.35	38855.57	1830.73	108.21	28781.28	80765.87
净转化量	676.22	-7.21	-107.17	-15.08	0.73	-547.50
2000—2010年
面积/km²	耕地	林地	草地	水域	城乡、工矿、居民用地	未利用地	2005年总计
耕地	2478.98	1.29	69.42	0.77	1.66	14.38	2566.51
林地	10.70	7930.74	4.28	4.60	0	4.24	7954.56
草地	258.27	9.64	38634.16	9.26	2.75	48.67	38962.74
水域	4.27	0.06	14.51	1782.03	0	44.93	1845.80
城乡、工矿、居民用地	2.29	0	0.06	0	105.12	0	107.47
未利用地	627.14	6.10	126.73	36.16	1.00	28531.64	29328.78
2010年总计	3381.65	7947.83	38849.18	1832.82	110.53	28643.86	80765.87
净转化量	815.14	-6.72	-113.56	-12.98	3.05	-684.93
2000—2015年
面积/km²	耕地	林地	草地	水域	城乡、工矿、居民用地	未利用地	2010年总计
耕地	2441.03	2.33	82.03	1.77	20.97	18.39	2566.51
林地	19.22	7893.08	16.10	12.04	4.21	9.92	7954.56
草地	421.59	22.47	38363.02	48.54	31.63	75.49	38962.74
水域	8.01	0.03	19.65	1773.53	0	44.58	1845.80
城乡、工矿、居民用地	2.44	0	0.06	0	104.88	0.09	107.47
未利用地	1179.87	11.01	209.31	107.32	37.68	27783.58	29328.78
2015年总计	4072.15	7928.92	38690.18	1943.21	199.36	27932.04	80765.87
净转化量	1505.64	-25.64	-272.56	97.41	91.89	-1396.74
2000—2020年
面积/km²	耕地	林地	草地	水域	城乡、工矿、居民用地	未利用地	2000年总计
耕地	1808.18	63.28	533.36	25.51	59.12	77.07	2566.51
林地	196.07	2849.38	4575.15	94.13	16.94	222.89	7954.56
草地	1299.60	2522.22	30162.99	228.07	90.67	4659.19	38962.74
水域	53.99	58.17	226.59	1214.05	1.46	291.54	1845.80
城乡、工矿、居民用地	41.77	5.30	22.81	1.78	32.91	2.90	107.47
未利用地	1786.26	127.34	8166.96	315.73	93.05	18839.44	29328.78
2020年总计	5185.87	5625.68	43687.87	1879.27	294.16	24093.02	80765.87
净转化量	2619.35	-2328.88	4725.13	33.47	186.68	-5235.76

Tab. 2

Fig. 3

Fig. 4

Tab. 3

Changes of converted area and carbon storage of different land use types from 2000 to 2020"

土地利用类型转化	2000—2005年		2000—2010年		2000—2015年		2000—2020年
土地利用类型转化	面积转移/km²	碳储量变化/10^-1Tg	面积转移 /km²	碳储量变化/10^-1Tg	面积转移 /km²	碳储量变化/10^-1Tg	面积转移/km²	碳储量变化/10^-1Tg
林地-耕地	10.48	-1.23	10.70	-1.26	19.22	-2.26	196.07	-23.01
草地-耕地	226.95	-4.90	258.27	-5.58	421.59	-9.11	1299.60	-28.07
水域-耕地	1.89	0.17	4.27	0.37	8.01	0.70	53.99	4.72
居民用地-耕地	2.29	0.18	2.29	0.18	2.44	0.19	41.77	3.26
未利用地-耕地	513.47	40.96	627.14	50.03	1179.87	94.13	1786.26	142.51
耕地-林地	0.82	0.10	1.29	0.15	2.33	0.27	63.28	7.43
草地-林地	7.43	0.71	9.64	0.92	22.47	2.15	2522.22	241.55
水域-林地	0	0	0.06	0.01	0.03	0.01	58.17	11.91
居民用地-林地	0	0	0	0	0	0	5.30	1.03
未利用地-林地	4.22	0.83	6.10	1.20	11.01	1.29	127.34	14.95
耕地-草地	63.28	1.37	69.42	1.50	82.03	1.77	533.36	11.52
林地-草地	3.35	-0.39	4.28	-0.50	16.10	-1.89	4575.15	-536.99
水域-草地	11.35	1.24	14.51	1.58	19.65	2.14	226.59	24.70
居民用地-草地	0	0	0.06	0.01	0.06	0.01	22.81	2.27
未利用地-草地	92.21	9.35	126.73	12.85	209.36	21.22	8166.96	827.97
耕地-水域	0.77	-0.07	0.77	-0.07	1.77	-0.15	25.51	-2.23
林地-水域	1.96	-0.40	4.60	-0.94	12.04	-2.47	94.13	-19.27
草地-水域	5.35	-0.58	9.26	-1.01	48.54	-5.29	228.07	-24.86
居民用地-水域	0	0	0	0	0	0	1.78	-0.02
未利用地-水域	28.13	-0.21	36.16	-0.28	107.32	-0.82	315.73	-2.41
耕地-居民用地	0.60	-0.05	1.66	-0.13	20.97	-1.63	59.12	-4.61
林地-居民用地	0	0	0	0	4.21	-0.82	16.94	-3.31
草地-居民用地	1.42	0.14	2.75	0.27	31.63	-3.15	90.67	-9.03
水域-居民用地	0	0	0	0	0	0	1.46	0.01
未利用地-居民用地	1.00	0.00184	1.00	0.00	37.68	0.07	93.05	0.17
耕地-未利用地	13.38	-1.07	14.38	-1.15	18.39	-1.47	77.07	-6.15
林地-未利用地	3.90	-0.77	4.24	-0.84	9.92	-1.96	222.89	-43.94
草地-未利用地	36.21	-3.67	48.67	-4.93	75.48	-7.65	4659.19	-472.35
水域-未利用地	38.05	0.29	44.93	0.34	44.58	0.34	291.54	2.22
居民用地-未利用地	0	0	0	0	0.09	-0.00016	2.90	-0.01

Tab. 3

Fig. 5

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土地利用类型	C_above	C_below	C_soil	C_dead
耕地	5.44	2.57	79.5	0.82
林地	50.43	13.16	141.29	0.82
草地	8.58	7.24	93.75	0.36
水域	0.93	0	0	0
城乡、工矿、居民用地	3.29	0	7.1	0
未利用地	0.75	0	7.8	0

Effects of human activities on carbon storage in the Irtysh River Basin

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