Nitrogen cycle of a typical Suaeda salsa marsh ecosystem in the
Yellow River estuary |
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Authors: | Xiaojie Mou Zhigao Sun Lingling Wang and Chuanyuan Wang |
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Institution: | 1. Key laboratory of Coastal Environment Processes, CAS, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;Key Laboratory of Wetland Ecology 2. Key laboratory of Coastal Environment Processes, CAS, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China 3. Key laboratory of Coastal Environment Processes, CAS, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;Graduate University of Chinese Ac |
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Abstract: | The nitrogen (N) biological cycle of the Suaeda salsa marsh ecosystem in the Yellow River estuary was studied during 2008 to 2009.
Results showed that soil N had significant seasonal fluctuations and vertical distribution. The N/P ratio (15.73±1.77) of S. salsa was
less than 16, indicating that plant growth was limited by both N and P. The N absorption coefficient of S. salsa was very low (0.007),
while the N utilization and cycle coefficients were high (0.824 and 0.331, respectively). The N turnover among compartments of S.
salsa marsh showed that N uptake from aboveground parts and roots were 2.539 and 0.622 g/m2, respectively. The N translocation
from aboveground parts to roots and from roots to soil were 2.042 and 0.076 g/m2, respectively. The N translocation from aboveground
living bodies to litter was 0.497 g/m2, the annual N return from litter to soil was far less than 0.368 g/m2, and the net N mineralization
in topsoil during the growing season was 0.033 g/m2. N was an important limiting factor in S. salsa marsh, and the ecosystem was
classified as unstable and vulnerable. S. salsa was seemingly well adapted to the low-nutrient status and vulnerable habitat, and the
nutrient enrichment due to N import from the Yellow River estuary would be a potential threat to the S. salsa marsh. Excessive nutrient
loading might favor invasive species and induce severe long-term degradation of the ecosystem if human intervention measures were
not taken. The N quantitative relationships determined in our study might provide a scientific basis for the establishment of effective
measures. |
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Keywords: | compartment model nitrogen biological cycle Suaeda salsa Yellow River estuary |
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