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Sci Total Environ

Title:		"Impacts of seasonality, drought, nitrogen fertilization, and litter on soil fluxes of biogenic volatile organic compounds in a Mediterranean forest"
Author(s):		Yang K; Llusia J; Preece C; Ogaya R; Marquez Tur L; Mu Z; You C; Xu Z; Tan Y; Penuelas J;
Address:		"CSIC, Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain. Electronic address: yangkaijun222@gmail.com. CSIC, Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain. Institute of Agrifood Research and Technology (IRTA), Sustainability in Biosystems Programme, Torre Marimon, 08140 Caldes de Montbui, Spain. CSIC, Global Ecology Unit CREAF-CSIC-UAB, CSIC, Bellaterra, 08193 Barcelona, Catalonia, Spain; CREAF, Cerdanyola del Valles, 08193 Barcelona, Catalonia, Spain; State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province & National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River & Institute of Ecology and Forestry, Sichuan Agricultural University, Chengdu 611130, China. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230927
Issue:
Page Number:		167354 -
DOI:		10.1016/j.scitotenv.2023.167354
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Biogenic volatile organic compounds (BVOCs) play critical roles in ecosystems at various scales, influencing above- and below-ground interactions and contributing to the atmospheric environment. Nonetheless, there is a lack of research on soil BVOC fluxes and their response to environmental changes. This study aimed to investigate the impact of drought, nitrogen (N) fertilization, and litter manipulation on soil BVOC fluxes in a Mediterranean forest. We assessed the effects of drought and N fertilization on soil BVOC exchanges and soil CO(2) fluxes over two consecutive years using a dynamic chamber method, and solid-phase microextraction was utilized to quantify soil BVOCs in one year. Our findings revealed that the soil acted as an annual net sink for isoprenoids (1.30-10.33 mug m(-2) h(-1)), with the highest uptake rates observed during summers (25.90 +/- 9.36 mug m(-2) h(-1)). The increased summer uptake can be attributed to the significant concentration gradient of BVOCs between atmosphere and soil. However, strong seasonal dynamics were observed, as the soil acted as a source of BVOCs in spring and autumn. The uptake rate of isoprenoids exhibited a significant positive correlation with soil temperature and atmospheric isoprenoid concentrations, while displaying a negative correlation with soil moisture and soil CO(2) flux. The effects of drought and N fertilization on soil BVOCs were influenced by the type of VOCs, litter layer, and season. Specifically, drought significantly affected the exchange rate and quantities of sesquiterpenes. N fertilization led to increased emissions of specific BVOCs (alpha-pinene and camphene) due to the stimulation of litter emissions. These findings underscore the importance of the soil as a sink for atmospheric BVOCs in this dry Mediterranean ecosystem. Future drought conditions may significantly impact soil water content, resulting in drier soils throughout the year, which will profoundly affect the exchange of soil BVOCs between the soil and atmosphere"
Keywords:		Atmospheric BVOCs Dynamic chamber method Holm oak forest Soil BVOCs exchange Solid-phase microextraction;
Notes:		"PublisherYang, Kaijun Llusia, Joan Preece, Catherine Ogaya, Roma Marquez Tur, Laura Mu, Zhaobin You, Chengming Xu, Zhenfeng Tan, Yu Penuelas, Josep eng Netherlands 2023/09/30 Sci Total Environ. 2023 Sep 27; 906:167354. doi: 10.1016/j.scitotenv.2023.167354"