Spatial distribution of charcoal in topsoil and its potential determinants on the Tibetan Plateau

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2023-12-05 DOI:10.1007/s11707-023-1095-5
Yixuan Wang, Chaoqun Cao, Yanrong Zhang, Lina Liu, Nannan Wang, Wenjia Li, Xianyong Cao
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Abstract

As an important proxy for investigating past fire activities, charcoal is often used to explore the characteristics of fire distribution and its relationships with vegetation, climate, and human activities. Research into the spatial distribution and environmental determinants for charcoal, however, is still limited. In this study, we identified and counted charcoal from topsoil samples covering the Tibetan Plateau using the pollen methodology, and investigated its relationships with vegetation net primary production (NPP), elevation, climate (precipitation, mean temperature of the coldest month and warmest month) and human population by boosted regression trees (BRT). Results reveal that the concentration of microscopic charcoal, macroscopic charcoal, and total charcoal all increase from south-west to north-east, which is consistent with the trend that the population density on the Tibetan Plateau is high in the east and low in the west, suggesting that an increase in human activity is likely to promote the occurrence of fire. The BRT modeling reveals that NPP, elevation, and mean temperature of the coldest month are important factors for total charcoal concentration on the Tibetan Plateau, and the frequency and intensity of fires further increase with increasing vegetation biomass, decreasing elevation, and decreasing mean temperature of the coldest month. The spatial variation characteristics of charcoal from topsoil on the Tibetan Plateau not only reflect well the spatial fire situation in the region, but also have a good indicative significance for vegetation, climate, and human activities.

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青藏高原表层土壤炭的空间分布及其潜在影响因素
作为研究过去火灾活动的重要指标,木炭常被用于研究火灾分布特征及其与植被、气候和人类活动的关系。然而,对木炭的空间分布和环境决定因素的研究仍然有限。本研究采用花粉法对青藏高原表层土壤样品中的木炭进行了鉴定和计数,并利用增强回归树(BRT)研究了其与植被净初级生产量(NPP)、海拔、气候(降水、最冷月和最暖月平均温度)和人口的关系。结果表明,微观炭浓度、宏观炭浓度和总炭浓度均由西南向东北增加,这与青藏高原人口密度东高西低的趋势一致,表明人类活动的增加可能促进火灾的发生。BRT模型表明,NPP、海拔高度和最冷月平均温度是影响青藏高原总炭浓度的重要因素,随着植被生物量的增加、海拔高度的降低和最冷月平均温度的降低,火灾发生的频率和强度进一步增加。青藏高原表层土壤炭的空间变化特征不仅能很好地反映该地区的空间火情,而且对植被、气候和人类活动都有很好的指示意义。
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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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