气候和土壤地球化学对中国东北松辽平原旱地土壤有机碳含量的影响

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Acta Geologica Sinica ‐ English Edition Pub Date : 2024-10-28 DOI:10.1111/1755-6724.15211
Kai LIU, Huimin DAI, Yunhong SONG, Shuai LIANG, Zhongfang YANG
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引用次数: 0

摘要

了解土壤有机碳(SOC)的空间分布及其影响因素对于理解全球碳循环至关重要。然而,土壤地球化学和气候条件对 SOC 的影响仍然有限,尤其是在旱地农业地区。本研究旨在加深对中国东北松辽平原旱地 SOC 分布影响因素的了解。该研究使用了由 35,188 个实测土壤样本组成的数据集来绘制该地区的 SOC 分布图。采用多元线性回归(MLR)和随机森林模型(RFM)来评估 SOC 驱动指标的重要性。我们还进行了部分相关分析和路径分析,以进一步研究气候与地球化学之间的关系。松辽平原旱地土壤中的 SOC 含量介于 0.05% 到 11.63% 之间,平均值为 1.47% ± 0.90%。从西南到东北地区,SOC 含量呈明显上升趋势。MLR 和 RFM 的结果显示,温度是最关键的因素,与 SOC 含量呈显著负相关。此外,氧化铁是影响 SOC 变化的最重要的土壤地球化学指标。我们的研究进一步表明,气候可能会通过对土壤地球化学性质的影响,对 SOC 浓度产生间接影响。这些见解强调了在预测未来气候变化下的 SOC 时考虑气候的直接和间接影响的重要性。
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Climate and Soil Geochemistry Influence the Soil Organic Carbon Content in Drylands of the Songliao Plain, Northeast China

The understanding of the spatial distribution of soil organic carbon (SOC) and its influencing factors is crucial for comprehending the global carbon cycle. However, the impact of soil geochemical and climatic conditions on SOC remains limited, particularly in dryland farming areas. In this study, we aimed to enhance the understanding of the factors influencing the distribution of SOC in the drylands of the Songliao Plain, Northeast China. A dataset comprising 35,188 measured soil samples was used to map the SOC distribution in the region. Multiple linear regression (MLR) and random forest models (RFM) were employed to assess the importance of driving indicators for SOC. We also carried out partial correlation and path analyses to further investigate the relationship between climate and geochemistry. The SOC content in dryland soils of the Songliao Plain ranged from 0.05% to 11.63%, with a mean value of 1.47% ± 0.90%. There was a notable increasing trend in SOC content from the southwest to the northeast regions. The results of MLR and RFM revealed that temperature was the most critical factor, demonstrating a significant negative correlation with SOC content. Additionally, iron oxide was the most important soil geochemical indicator affecting SOC variability. Our research further suggested that climate may exert an indirect influence on SOC concentrations through its effect on geochemical properties of soil. These insights highlight the importance of considering both the direct and indirect impact of climate in predicting the SOC under future climate change.

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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
期刊最新文献
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