| 基于MGWR的黄河流域土壤有机碳密度和影响因素分析 |
| 摘要点击 2655 全文点击 858 投稿时间：2022-03-10 修订日期：2022-05-31 |
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| 中文关键词 多尺度地理加权回归(MGWR) 黄河流域 土壤有机碳密度 空间分布 生态系统类型 |
| 英文关键词 mixed geographically weighted regression(MGWR) Yellow River basin soil organic carbon density spatial distribution ecosystem types |
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| 中文摘要 |
| 土壤有机碳作为最大陆地碳库，其空间分布特征和影响因素对于全球碳循环过程具有重要影响.基于土壤有机碳密度数据，结合环境因子，使用多尺度地理加权回归（MGWR）模型预测了黄河流域土壤有机碳密度（SOCD）和影响因素.结果表明：①黄河流域0~20 cm和0~100 cm的SOCD范围分别为0~14.82 kg ·m-2和0~32.39kg ·m-2，均值分别为3.48 kg ·m-2和8.07kg ·m-2，储量则分别为2.76 Pg和6.48 Pg；②各生态系统类型中，0~20 cm的SOCD从大到小依次为：森林>水体与湿地>其他>草地>农田>聚落>荒漠，0~100 cm的SOCD从大到小依次为：水体与湿地>森林>其他>草地>农田>聚落>荒漠，SOCR从大到小皆为：草地>农田>森林>荒漠>水体与湿地>聚落>其他；③黄河流域SOCD的分布主要受常数项、剖面曲率、NDVI和降水的影响，曲率和粉砂对深层的SOCD的分布也具有重要影响；此外，降水、NDVI和常数项（除森林外）是影响各生态系统的主要因素，曲率和粉砂则仅对荒漠和其他生态系统具有重要影响.研究结果得出了黄河流域SOCD的空间分布和影响因素，可为黄河流域碳平衡、土壤质量评价和生态治理恢复与巩固提升提供科学依据. |
| 英文摘要 |
| 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. |
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