气候变化领域集成服务门户(CCPortal): Fire transforms effects of terrestrial subsidies on aquatic ecosystem structure and function

CCPortal

DOI	10.1111/gcb.17058
	Fire transforms effects of terrestrial subsidies on aquatic ecosystem structure and function
	Wall, Christopher B.; Spiegel, Cody J.; Diaz, Evelyn M.; Tran, Cindy H.; Fabiani, Alexia; Broe, Taryn Y.; Perez-Coronel, Elisabet; Jackrel, Sara L.; Mladenov, Natalie; Symons, Celia C.; Shurin, Jonathan B.
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	1
卷号	30 期号:1
英文摘要	Fire can lead to transitions between forest and grassland ecosystems and trigger positive feedbacks to climate warming by releasing CO2 into the atmosphere. Climate change is projected to increase the prevalence and severity of wildfires. However, fire effects on the fate and impact of terrestrial organic matter (i.e., terrestrial subsidies) in aquatic ecosystems are unclear. Here, we performed a gradient design experiment in freshwater pond mesocosms adding 15 different amounts of burned or unburned plant detritus and tracking the chronology of detritus effects at 10, 31, 59, and 89days. We show terrestrial subsidies had time- and mass-dependent, non-linear impacts on ecosystem function that influenced dissolved organic carbon (DOC), ecosystem metabolism (net primary production and respiration), greenhouse gas concentrations (carbon dioxide [CO2], methane [CH4]), and trophic transfer. These impacts were shifted by fire treatment. Burning increased the elemental concentration of detritus (increasing %N, %P, %K), with cascading effects on ecosystem function. Mesocosms receiving burned detritus had lower [DOC] and [CO2] and higher dissolved oxygen (DO) through Day 59. Fire magnified the effects of plant detritus on aquatic ecosystem metabolism by stimulating photosynthesis and respiration at intermediate detritus-loading through Day 89. The effect of loading on DO was similar for burned and unburned treatments (Day 10); however, burned-detritus in the highest loading treatments led to sustained hypoxia (through Day 31), and long-term destabilization of ecosystem metabolism through Day 89. In addition, fire affected trophic transfer by increasing autochthonous nitrogen source utilization and reducing the incorporation of N-15-labeled detritus into plankton biomass, thereby reducing the flux of terrestrial subsidies to higher trophic levels. Our results indicate fire chemically transforms plant detritus and alters the role of aquatic ecosystems in processing and storing carbon. Wildfire may therefore induce shifts in ecosystem functions that cross the boundary between aquatic and terrestrial habitats.
英文关键词	dissolved organic carbon; plankton; productivity; pyrogenic; trophic transfer
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001151213000072
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302577
作者单位	University of California System; University of California San Diego; California State University System; San Diego State University; University of California System; University of California Irvine
推荐引用方式 GB/T 7714	Wall, Christopher B.,Spiegel, Cody J.,Diaz, Evelyn M.,et al. Fire transforms effects of terrestrial subsidies on aquatic ecosystem structure and function[J],2024,30(1).
APA	Wall, Christopher B..,Spiegel, Cody J..,Diaz, Evelyn M..,Tran, Cindy H..,Fabiani, Alexia.,...&Shurin, Jonathan B..(2024).Fire transforms effects of terrestrial subsidies on aquatic ecosystem structure and function.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Wall, Christopher B.,et al."Fire transforms effects of terrestrial subsidies on aquatic ecosystem structure and function".GLOBAL CHANGE BIOLOGY 30.1(2024).