黑土剖面母质风化过程与有机碳积累过程:中国东北松嫩平原克山地区案例研究

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Rui XIA, Guoli YUAN, Minli CUI, Hongxing HOU, Guangming YU, Liangsheng GE, Kaining LÜ, Bingzhang REN
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引用次数: 0

摘要

黑土对维护区域粮食安全和促进全球农业生产至关重要。了解母质风化过程和有机碳的富集对理解黑土的发育历史和未来趋势至关重要,特别是在全球大规模种植和气候变化的背景下。虽然黑土形成与演化的重要性不容忽视,但相关研究仍然十分匮乏。本研究在松嫩平原克山地区采集了典型的8米深的土芯,该地区表层黑土在古沉积物上发育。利用14C测年法确定了黑土的形成年龄。根据沉积物的地球化学组成、粒度和磁化率特征,表明黑土及其母质来源于黄土再加工。此外,确定了部分元素的传质系数(τ),以探索土壤的风化过程。通过对碱性元素和碱土元素输运量的计算,发现母质对黑土的风化速率较弱,为0.16 kEq·ha-1·year-1。结合黑土各层碳密度测年结果,确定了黑土有机碳积累速率:在13.2 ~ 2.2 ka初期迅速增加,在2.2 ~ 0.8 ka达到最大值34.0 g·cm-2·a - 1,随后呈下降趋势,平均值为-77.5 g·cm-2·a - 1。与区域气候变化相比,全新世时期,克山黑土发育的气候更为寒冷湿润。可以预见的是,持续的全球变暖可能导致松嫩平原以及其他地区的黑土退化。我们的结果将丰富黑土形成和未来演化趋势的地质知识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Weathering Process of Parent Material and Accumulation Process of Organic Carbon on the Black Soil Profile: A Case Study from the Keshan Area of the Songnen Plain in Northeast China

Weathering Process of Parent Material and Accumulation Process of Organic Carbon on the Black Soil Profile: A Case Study from the Keshan Area of the Songnen Plain in Northeast China

Black soil is essential for maintaining regional food security and promoting global agricultural production. Understanding the weathering process of parent material and the accumulation of organic carbon is crucial to comprehending the developmental history and future trends of black soil, especially against the background of large-scale global cultivation and climate change. Although the importance of black soil formation and evolution cannot be ignored, the relevant research is still very scarce. In this study, a typical eight-meter-deep soil core was collected from the Keshan area of the Songnen Plain, Northeast China, where surface black soil developed on paleo-sediments. Using 14C dating, the formation age of the black soil was determined. Based on the characteristics of the geochemical composition, grain size and the magnetic susceptibility of the sediments, it was demonstrated that the black soil and its parent material originated from reworked loess. Furthermore, the mass transfer coefficient (τ) of some elements was determined, in order to explore the soil weathering process. By calculating the transported amount of alkaline and alkaline-earth elements, the weathering rate of parent material to black soil was found to be weak, at 0.16 kEq·ha–1·year–1. Combining the results of dating and carbon density in the different layers of black soil, the accumulation rate of organic carbon was determined as follows: rapidly increasing in the initial period of 13.2–2.2 ka, reaching its maximum average value of 34.0 g·cm–2·a–1 at 2.2–0.8 ka, then showing a decreasing trend with an average value of -77.5 g·cm–2·a–1. Compared with regional climate change, Keshan black soil has developed under a colder and wetter climate during the Holocene. Predictably, ongoing global warming may lead to the degradation of black soils in the Songnen Plain, as well as in other regions. Our results will enrich geological knowledge of black soil formation and future evolutionary trends.

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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.
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