期刊
ECOLOGICAL INDICATORS
卷 120, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ecolind.2020.106943
关键词
Litter decomposition rate; Estuarine wetland; Salinity; Inundation; Litter quality
资金
- National Key R&D Program of China [2017YFC0505903]
- National Natural Science Foundation of China [41771547]
- China Scholarship Council [201906510013]
- National Science Foundation [01A-1458952]
- National Institute of Food and Agriculture (McStennis Project) [WVA00117, WVA00812]
The decomposition rate of plant litter is mainly controlled by litter quality and environmental factors. In this study, it was found that higher salinity under inundation conditions can lead to faster decomposition rates, while the ratio of nitrogen to phosphorous showed an upward trend during the process. Additionally, both water chemical oxygen demand and NH3-N concentration were inversely correlated with salinity.
The main factors controlling plant litter decomposition rates are litter quality and environmental factors. We investigated how different salinity and inundation conditions influence the decomposition rate and how litter quality affects dynamic change during the decomposition process in the Yellow River Delta wetland in northeastern China. To do this, we designed a field experiment using the litter bag method to study two selected dominant halophyte species (Phragmites australis and Suaeda salsa). We found litter decomposed faster when inundated across a range of salinities. Both the water chemical oxygen demand and NH3-N concentration were inversely correlated with salinity. The ratio of nitrogen to phosphorous showed an upward trend during the process of decomposition. The decomposition rate increased during the later stage of the process. Under inundation conditions, the decomposition rate of only S. salsa showed a positive correlation with salinity. The study results suggest that moderately higher salinity would increase anaerobic decomposition owing to the combined effect of salinity and inundation. The implications of our findings may be used to further assess the impact of environmental parameters and litter quality on the decomposition rate in estuarine wetland and can help determine a strategy for wetland reparation and remediation.
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