气候变化领域集成服务门户(CCPortal): Intrinsic and extrinsic drivers of organic matter processing along phosphorus and salinity gradients in coastal wetlands

CCPortal

DOI	10.1111/1365-2745.14302
	Intrinsic and extrinsic drivers of organic matter processing along phosphorus and salinity gradients in coastal wetlands
	Anderson, Kenneth J.; Kominoski, John S.; Sah, Jay P.
发表日期	2024
ISSN	0022-0477
EISSN	1365-2745
英文摘要	Climate change is accelerating sea-level rise and saltwater intrusion in coastal regions world-wide and interacting with large-scale changes in species composition in coastal wetlands. Quantifying macrophyte litter breakdown along freshwater-to-marine coastal gradients is needed to predict how carbon stores will respond to shifts in both macrophyte communities and water chemistry under changing environmental conditions. To test the interactive drivers of changing species identity and water chemistry, we performed a reciprocal transplant of four macrophyte litter species in seven sites along freshwater-to-marine gradients in the Florida Coastal Everglades. We measured surface water chemistry (dissolved organic carbon, total nitrogen and total phosphorus), litter chemistry (% nitrogen, % phosphorus, change in N:P molar ratio, % cellulose and % lignin as proxies for recalcitrance) and litter breakdown rates (k/degree-day). Direct effects of salinity and surface water nutrients were the strongest drivers of k, but unexpectedly, litter chemistry did not correlate with litter k. However, salinity strongly correlated with changes in litter chemistry, whereby litter incubated in brackish and marine wetlands was more labile and gained more phosphorus compared with litter in freshwater marshes. Our results suggest that litter k in coastal wetlands is explained by species-specific interactions among water and litter chemistries. Water nutrient availability was an important predictor of breakdown rates across species, but breakdown rates were only explained by the carbon recalcitrance of litter in the species with the slowest breakdown (Cladium jamaicense), indicating the importance of carbon structure, and species identity on breakdown rates. Synthesis. In oligotrophic ecosystems, nutrients are often the primary driver of organic matter breakdown. However, we found that variation in macrophyte breakdown rates in oligotrophic coastal wetlands was also explained by salinity and associated seawater chemistry, emphasising the need to understand how saltwater intrusion will alter organic matter processing in wetlands. Our results suggest that marine subsidies associated with sea-level rise have the potential to accelerate leaf litter breakdown. The increase in breakdown rates could either be buffered or increase further as sea-level rise also shifts macrophyte community composition to more or less recalcitrant species. In oligotrophic ecosystems, nutrients are often the primary driver of organic matter breakdown. However, the authors found that variation in macrophyte breakdown rates in oligotrophic coastal wetlands was also explained by salinity and associated seawater chemistry, emphasising the need to understand how saltwater intrusion will alter organic matter processing in wetlands. The results suggest that marine subsidies associated with sea-level rise have the potential to accelerate leaf litter breakdown. The increase in breakdown rates could either be buffered or increase further as sea-level rise also shifts macrophyte community composition to more or less recalcitrant species.image
英文关键词	carbon; coastal wetlands; lignin; litter decomposition; nitrogen; phosphorus; salinity; sea-level rise
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
WOS类目	Plant Sciences ; Ecology
WOS记录号	WOS:001193372900001
来源期刊	JOURNAL OF ECOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306486
作者单位	State University System of Florida; Florida International University; State University System of Florida; Florida International University
推荐引用方式 GB/T 7714	Anderson, Kenneth J.,Kominoski, John S.,Sah, Jay P.. Intrinsic and extrinsic drivers of organic matter processing along phosphorus and salinity gradients in coastal wetlands[J],2024.
APA	Anderson, Kenneth J.,Kominoski, John S.,&Sah, Jay P..(2024).Intrinsic and extrinsic drivers of organic matter processing along phosphorus and salinity gradients in coastal wetlands.JOURNAL OF ECOLOGY.
MLA	Anderson, Kenneth J.,et al."Intrinsic and extrinsic drivers of organic matter processing along phosphorus and salinity gradients in coastal wetlands".JOURNAL OF ECOLOGY (2024).