陕西省土壤无机碳的时空分布特征及影响因素

doi:10.3864/j.issn.0578-1752.2024.08.008

Abstract

Abstract:

【Objective】Soil inorganic carbon (SIC) plays an important role in regulating global carbon cycle. However, the distribution characteristics and influencing factors of SIC at regional scales are not clear. The study on the temporal and spatial distribution of SIC and its key influencing factors in Shaanxi Province can provide the reference and basis for clarifying the role and status of inorganic carbon in the terrestrial ecosystem carbon cycle. 【Method】This study collected 65 and 142 soil samples from the 1980s and 2010s in Shaanxi Province, along with relevant data on geographical factors, climatic conditions, land use types, vegetation status and soil properties. Variance analysis and Random Forest (RF) model were used to analyze the temporal and spatial distribution characteristics of SIC content. The influencing factors of SIC content in Shaanxi Province were also discussed. 【Result】SIC content in the 1980s of Shaanxi Province was in the order of Northern Shaanxi > Guanzhong of Shaanxi > Southern Shaanxi. Compared with the 1980s, SIC content in Northern Shaanxi Province was decreased by 31.5% in 2010s, while it remained almost unchanged in Guanzhong of Shaanxi Province, which increased slightly in southern Shaanxi Province. From the 1980s to 2010s, the decrease of inorganic carbon content in different soil layers in 0-100 cm section ranged from 20.6% to 27.7%, with the greatest decreases in 0-20 cm and 80-100 cm soil layers. Random Forest model analysis showed that average annual rainfall, bulk density and pH were the top three most important factors affecting SIC content in both 1980s and 2010s, and SIC content was the highest when the average annual rainfall were 450-650 mm. Soil inorganic carbon content increased with the increase of pH. The inorganic carbon content of soil with low bulk density was higher than that of soil with high bulk density. 【Conclusion】In general, SIC content in Shaanxi Province showed a decreasing trend from north to south. Compared with the 1980s, SIC content in topsoil of Shannxi Province and also the whole soil profile of northern Shaanxi Province decreased significantly in the 2010s. The SIC content in the 1980s and 2010s were mainly influenced by average annual rainfall, pH and bulk density.

Key words: soil inorganic carbon (SIC), spatiotemporal distribution, Random Forest model, Shaanxi Province

FENG XiaoLin, ZHANG ChuTian, XU ChenYang, GENG ZengChao, HU FeiNan, DU Wei. Spatiotemporal Distribution Characteristics and Influencing Factors of Soil Inorganic Carbon in Shaanxi Province[J].Scientia Agricultura Sinica, 2024, 57(8): 1517-1532.

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因子 Factor	时期 Period	最小值 Min	最大值 Max	平均值 Mean	标准差 SD	峰度 Kurtosis	偏度 Skewness	变异系数 CV（%）
土壤无机碳含量 SIC (g·kg^-1)	1980s	0.14	36.24	9.17	6.46	3.34	1.01	70.4
土壤无机碳含量 SIC (g·kg^-1)	2010s	0.14	29.62	6.88	6.19	0.88	0.97	90.0
海拔 Altitude (m)	1980s	256.00	2875.00	878.31	462.18	4.30	1.50	52.6
海拔 Altitude (m)	2010s	318.00	2499.00	908.74	413.67	0.70	0.83	46.0
坡度 Slope (°)	1980s	0.20	18.37	5.29	4.99	-0.45	0.95	94.4
坡度 Slope (°)	2010s	0.37	32.38	6.44	6.21	1.73	3.17	97.0
坡向 SD	1980s	0.00	349.79	157.06	93.21	-0.92	0.03	59.4
坡向 SD	2010s	6.34	357.88	166.63	105	0.32	-1.07	63.0
曲率 Curvature	1980s	-0.39	0.65	0.03	0.20	1.27	0.68	703.3
曲率 Curvature	2010s	-1.14	1.34	-0.04	0.28	-0.04	6.51	700.0
年平均降水量 MAP (mm)	1980s	373.31	1448.37	658.62	205.24	2.62	1.18	31.2
年平均降水量 MAP (mm)	2010s	337.06	993.64	645.23	170.67	0.28	-0.78	26.0
年平均温度 MAT (℃)	1980s	4.90	15.83	10.98	2.51	-0.83	-0.13	22.8
年平均温度 MAT (℃)	2010s	4.72	16.78	12.51	2.68	-0.20	-1.02	21.0
归一化植被指数 NDVI	1980s	0.28	0.97	0.64	0.24	0.05	-0.66	38.7
归一化植被指数 NDVI	2010s	0.19	0.88	0.63	0.16	-0.70	-0.40	26.0
容重 BD (g·cm^-3)	1980s	1.28	1.37	1.35	0.02	3.07	-1.60	1.4
容重 BD (g·cm^-3)	2010s	1.14	3.88	1.50	0.24	75.93	7.44	15.7
pH	1980s	6.1	9.2	8.1	0.63	1.77	-1.35	7.7
pH	2010s	5.7	9.9	8.3	0.73	1.68	-1.26	8.8

Spatiotemporal Distribution Characteristics and Influencing Factors of Soil Inorganic Carbon in Shaanxi Province

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