Changes in soil carbon sequestration and emission in different succession stages of biological soil crusts in a sand-binding area

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Carbon Balance and Management Pub Date : 2021-09-13 DOI:10.1186/s13021-021-00190-7

Bo Wang, Jing Liu, Xin Zhang, Chenglong Wang

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Abstract

Background

We investigated the spatio-temporal dynamics of soil carbon dioxide (CO₂)- and soil methane (CH₄)-flux during biological soil crust (BSCs) deposition in a sand-binding area in the eastern Chinese Hobq Desert. The trends in soil organic carbon (C) content and density were analyzed during this process. The sampling sites comprised a mobile dune (control) and those with algal, lichen, and moss crust-fixed sands. The desert soil CO₂- and CH₄-flux, temperature, and water content were measured from May to October in 2017 and 2018. Simultaneously, organic C content and density were measured and analyzed by stratification.

Results

The spatio-temporal variation in desert soil CO₂-flux was apparent. The average CO₂- fluxes in the control, algal, lichen, and moss sites were 1.67, 2.61, 5.83, and 6.84 mmol m⁻² h⁻¹, respectively, during the growing season, and the average CH₄-fluxes in the four sites were − 1.13, − 1.67, − 3.66, and − 3.77 µmol m⁻² h⁻¹, respectively. Soil temperature was significantly positively correlated with CO₂-flux but could not influence CH₄ absorption, and C flux had minimal correlation with soil water content. The soil total organic C density at all sites was significantly different and decreased as follows: moss > lichen > algal > control; moreover, it decreased with soil depth at all sites. The accumulation of desert soil organic C could enhance soil C emissions.

Conclusion

In a semi-arid desert, artificial planting could promote sand fixation and BSCs succession; therefore, increasing the C storage capacity of desert soils and decreasing soil C emissions could alter the C cycle pattern in desert ecosystems. Soil temperature is the major factor controlling desert soil CO₂ flux and vegetation restoration, and BSCs development could alter the response patterns of C emissions to moisture conditions in desert soils. The results provide a scientific basis for studying the C cycle in desert ecosystems.

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固沙区生物土壤结壳不同演替阶段土壤固碳量和碳排放量的变化

背景我们研究了中国东部霍布克沙漠风沙区生物土壤板结沉积过程中土壤二氧化碳（CO2）和土壤甲烷（CH4）外流的时空动态。分析了这一过程中土壤有机碳（C）含量和密度的变化趋势。采样点包括移动沙丘（对照）和藻类、地衣和苔藓结壳固定沙丘。在2017年和2018年的5月至10月期间，测量了沙漠土壤的二氧化碳和甲烷通量、温度和含水量。结果沙漠土壤二氧化碳通量的时空变化明显。在生长季节，对照地、藻类地、地衣地和苔藓地的平均二氧化碳通量分别为 1.67、2.61、5.83 和 6.84 mmol m-2 h-1，四个地点的平均甲烷通量分别为 - 1.13、- 1.67、- 3.66 和 - 3.77 µmol m-2 h-1。土壤温度与二氧化碳通量呈明显的正相关，但不影响对甲烷的吸收，而碳通量与土壤含水量的相关性很小。所有地点的土壤总有机碳密度均有明显差异，且随着苔藓、地衣、藻类和对照组的增加而减少；此外，所有地点的土壤总有机碳密度均随着土壤深度的增加而减少。结论在半干旱荒漠中，人工种植可促进固沙和BSCs演替，因此提高荒漠土壤的C储存能力和减少土壤C排放量可改变荒漠生态系统的C循环模式。土壤温度是控制沙漠土壤二氧化碳通量和植被恢复的主要因素，而BSCs的发展可改变沙漠土壤中C排放对水分条件的响应模式。这些结果为研究沙漠生态系统的碳循环提供了科学依据。

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来源期刊

Carbon Balance and Management Environmental Science-Management, Monitoring, Policy and Law

CiteScore

7.60

自引率

0.00%

发文量

审稿时长

14 weeks

期刊介绍： Carbon Balance and Management is an open access, peer-reviewed online journal that encompasses all aspects of research aimed at developing a comprehensive policy relevant to the understanding of the global carbon cycle. The global carbon cycle involves important couplings between climate, atmospheric CO2 and the terrestrial and oceanic biospheres. The current transformation of the carbon cycle due to changes in climate and atmospheric composition is widely recognized as potentially dangerous for the biosphere and for the well-being of humankind, and therefore monitoring, understanding and predicting the evolution of the carbon cycle in the context of the whole biosphere (both terrestrial and marine) is a challenge to the scientific community. This demands interdisciplinary research and new approaches for studying geographical and temporal distributions of carbon pools and fluxes, control and feedback mechanisms of the carbon-climate system, points of intervention and windows of opportunity for managing the carbon-climate-human system. Carbon Balance and Management is a medium for researchers in the field to convey the results of their research across disciplinary boundaries. Through this dissemination of research, the journal aims to support the work of the Intergovernmental Panel for Climate Change (IPCC) and to provide governmental and non-governmental organizations with instantaneous access to continually emerging knowledge, including paradigm shifts and consensual views.