Carbon Emission and Redistribution among Forest Carbon Pools, and Change in Soil Nutrient Content after Different Severities of Forest Fires in Northeast China
Carbon Emission and Redistribution among Forest Carbon Pools, and Change in Soil Nutrient Content after Different Severities of Forest Fires in Northeast China
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发表时间：
2022
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通讯作者：
Xiaoying Ping;Yu Chang;Miao Liu;Yuanman Hu;W. Huang;Sixue Shi;Yuchen Jia;Dikang Li
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作者：
Xiaoying Ping;Yu Chang;Miao Liu;Yuanman Hu;W. Huang;Sixue Shi;Yuchen Jia;Dikang Li
森林火灾是影响北方森林碳分布的重要因素，森林火灾向大气中排放碳并导致碳库之间的碳再分配。然而，对于在不同程度的火灾中被烧毁的地区，有多少碳在池之间转移，以及土壤养分含量的直接变化，我们的知识仍然有限。在这项研究中，我们在火灾发生后的三个月内调查了位于中国东北的八个野火地点。结果表明，中、重度火灾后土壤总氮、磷和有机碳含量显著增加。低、中、高等级林火的碳排放量分别为3.84、5.14和12.86 Mg C/ha。除木炭池外，池间碳转移量随火灾严重程度的增加而增加，在中度火灾中储存的碳量最高。虽然炭池和灰池在整个生态系统中所占比例较小，但它们对生物地球化学循环具有重要意义，值得重视。本研究的碳再分布信息对于准确估算森林碳收支具有重要意义，为森林碳循环模型纳入碳转移过程提供了关键参数。
: Forest fires are a significant factor that affects the boreal forest carbon distribution which emits carbon into the atmosphere and leads to carbon redistribution among carbon pools. However, knowledge about how much carbon was transferred among pools and the immediate changes in soil nutrient contents in areas that were burned by fires of various severities are still limited. In this study, we surveyed eight wildfire sites that are located in northeast China within three months after the fires occurred. Our results indicate that the total soil nitrogen, phosphorus, and organic carbon contents significantly increased after moderate- and high-severity fires. The carbon emissions were 3.84, 5.14, and 12.86 Mg C/ha for low-, moderate-, and high-severity fires, respectively. The amount of carbon transferred among pools increased with fire severity except for the charcoal pool, storing the highest amounts of carbon in moderate-severity fires. Although the charcoal and ash pools accounted for a small proportion of the total ecosystem, they are important for biogeochemical cycles and are worthy of attention. The carbon redistribution information in our study is important for accurately estimating the forest carbon budget and providing crucial parameters for forest carbon cycling models to incorporate the carbon transfer process.