Scientia Agricultura Sinica ›› 2024, Vol. 57 ›› Issue (8): 1517-1532.doi: 10.3864/j.issn.0578-1752.2024.08.008

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

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

FENG XiaoLin1(), ZHANG ChuTian1, XU ChenYang1,2(), GENG ZengChao1,2(), HU FeiNan3,4, DU Wei1,2   

  1. 1 College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi
    2 Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling 712100, Shaanxi
    3 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi
    4 Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, Shaanxi
  • Received:2023-05-30 Accepted:2023-07-17 Online:2024-04-16 Published:2024-04-24
  • Contact: XU ChenYang, GENG ZengChao

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

Fig. 1

Spatial distribution of soil inorganic carbon contents in the 1980s (A) and 2010s (B) in Shaanxi Province (mean±standard error)"

Fig. 2

Temporal distribution characteristics of soil inorganic carbon contents in Shaanxi Province (mean ± standard error)"

Table 1

Descriptive statistics of soil inorganic carbon content and its factors in 1980s and 2010s of Shaanxi Province"

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
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
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
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
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
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
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
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
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
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
2010s 5.7 9.9 8.3 0.73 1.68 -1.26 8.8

Fig. 3

Effects of elevation, slope, slope directive and plane curvature on soil inorganic carbon content in the 1980s (A, B, C, D) and 1980s (E, F, G, H) Lowercase letters indicate significant differences in soil inorganic carbon content among all groups (P<0.05). The red and black dots in the box chart show the mean and outlier, respectively. The horizontal lines in the box correspond to the median of the data. The top edge line, bottom edge line, top error line, and bottom error line of the box represent the 25th, 75th, 5th, and 95th percentiles, respectively. The same as below"

Fig. 4

Effects of annual mean rainfall and annual mean temperature on soil inorganic carbon content in the 1980s (A, B) and 1980s (C, D)"

Fig. 5

Effects of land use types on soil inorganic carbon content in the 1980s (A) and 2010s (B)"

Fig. 6

Effects of normalized vegetation index on soil inorganic carbon content in the 1980s (A) and 2010s (B)"

Fig. 7

Effects of bulk density and pH on soil inorganic carbon content in the 1980s (A,B) and 2010s (C, D)"

Fig. 8

Relative importance of variables of RF models in the 1980s (A) and 2010s (B)"

Fig. 9

Partial dependence plots of soil inorganic carbon content and various variables in the 1980s and 2010s"

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