Spatial Distribution Characteristics and Influencing Factors of Soil Organic Carbon Density in Yellow River Basin Based on MGWR Model

被引：0
作者：
Nan F.-S. [1 ]
Li Z.-X. [1 ,2 ]
Zhang X.-P. [1 ]
Cui Q. [2 ]
Li Y.-C. [1 ]
Xiong X.-T. [1 ]
Yang X.-J. [1 ]
Yang A.-L. [1 ]
机构：
[1] College of Geography and Environmental Science, Northwest Normal University, Lanzhou
[2] Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 02期
关键词：
ecosystem types; mixed geographically weighted regression(MGWR); soil organic carbon density; spatial distribution; Yellow River basin;
D O I：
10.13227/j.hjkx.202203091
中图分类号：
学科分类号：
摘要：
As the largest terrestrial carbon pool, the spatial distribution characteristics and influencing factors of soil organic carbon have important implications for global carbon cycle processes. Soil organic carbon density (SOCD) and influencing factors were predicted in the Yellow River basin using a mixed geographically weighted regression (MGWR) model based on soil organic carbon density data and environmental factors. The results showed that: ① the SOCD ranged from 0-14. 82 kg.m - 2 and 0-32. 39 kg.m - 2 for the soil depths of 0-20 cm and 0-100 cm, with mean values of 3. 48 kg.m - 2 and 8. 07 kg.m - 2 and reserves of 2. 76 Pg and 6. 48 Pg, respectively. The high SOCD value areas were mainly located in the southern part of the Qinghai-Tibet Plateau and Loess Plateau, and the low value areas were located in the eastern part of the upper Yellow River and the inland flow area. ②Among the ecosystem types, the SOCD of soil depth in 0-20 cm was in the descending order of: forest > water body and wetland > other > grassland > farmland > settlement > desert, with mean values of 4. 52, 4. 31, 3. 84, 3. 73, 2. 89, 2. 78, and 2. 22 kg.m - 2 , respectively, and the SOCD of the 0-100 cm soil depth was in the descending order of: water bodies and wetlands > forest > other > grassland > farmland > settlement > desert, with mean values of 9. 58, 9. 58, 8. 85, 8. 66, 7. 07, 6. 81, and 5. 29 kg.m - 2 , respectively. The SOCR in descending order was: grassland > farmland > forest > desert > water bodies and wetlands > settlement > others, with 1. 40, 0. 60, 0. 47, 0. 11, 0. 07, 0. 06, and 0. 05 Pg at a soil depth of 0-20 cm and 3. 31, 1. 49, 0. 99, 0. 26, 0. 17, 0. 14, and 0. 12 Pg at a soil depth of 0-100 cm, respectively. ③ The main factors affecting the SOCD distribution were intercept, profile curvature, NDVI, and precipitation; in addition, curvature and silt also had important effects on the deep SOCD distribution in the Yellow River basin. Among the ecosystem types, precipitation and NDVI were the main factors affecting the SOCD distribution. The intercept also had important effects on the SOCD distribution in the all ecosystems except forests, whereas curvature and silt only had important effects on deserts and other ecosystems. These results revealed the spatial distribution of SOCD, influencing factors, and SOCR in the Yellow River basin and can provide a scientific basis for carbon balance, soil quality evaluation, and ecological management restoration and consolidation in the region. © 2023 Science Press. All rights reserved.
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页码：912 / 923
页数：11
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