Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. Chinese Geographical Science, 2012, 22(1): 15-28.
Citation: Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. Chinese Geographical Science, 2012, 22(1): 15-28.

Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary

Funds:  National Natural Science Foundation of China
  • Received Date: 2010-12-02
  • Rev Recd Date: 2011-04-19
  • Publish Date: 2012-01-03
  • Abstract: From April 2008 to November 2009, the nitrogen (N) cycling of plant-soil system in Suaeda salsa wetland in the intertidal zone of the Yellow River estuary was studied with a compartment model. Results showed that the N in soil had significantly seasonal fluctuations and vertical distribution, and the net N mineralization rates in topsoil were significantly different in growing season (p<0.01). The N contents in root and stem of S. salsa generally decreased, while those in leaf fluctuated significantly. The N/P ratio (9.87±1.23) of S. salsa was less than 14, indicating that the growth of plant was limited by N. The litter production and the N content in litter changed significantly, and the change trends were just the opposite. The mass loss and N content increased at all times during litter decomposition, and the C/N ratio controlled the N dynamics of S. salsa litter. The N accumulated in S. salsa litter at all times, which was ascribed to the N immobilization by microbes from the decomposition environment. The N in the plant subsystem was mainly stored in aboveground living body. Soil organic N was the main N stock of plant-soil system, accounting for 97.35% of the total N stock. The N absorption and utilization coefficients of S. salsa were very low (0.0145 and 0.3844, respectively), while the N cycling coefficient was high (0.7108). The N turnovers among compartments of S. salsa wetland showed that the N uptake amount of aboveground part and root were 7.764 and 4.332g/m2, respectively. The N translocation amounts from aboveground part to root and from root to soil were 3.881 and 0.626g/m2, respectively. The N translocation amount from aboveground living body to litter was 3.883g/m2, the annual N return amount from litter to soil was larger than 0.125(-)g/m2 (minus expressed immobilization), and the net N mineralization amount in topsoil (0-15cm) in growing season was 1.190g/m2. The assessment of N cycling status of S. salsa wetland indicated that the N was a very important limiting factor, and the ecosystem was situated in unstable and vulnerable status. The S. salsa seemed to be well adapted to the low-nutrient status and vulnerable habitat, and the N quantitative relationships in the compartment model might provide some scientific bases for us to reveal the special adaptive strategy of S. salsa to the vulnerable habitat in the following studies.
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Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary

Funds:  National Natural Science Foundation of China

Abstract: Abstract: From April 2008 to November 2009, the nitrogen (N) cycling of plant-soil system in Suaeda salsa wetland in the intertidal zone of the Yellow River estuary was studied with a compartment model. Results showed that the N in soil had significantly seasonal fluctuations and vertical distribution, and the net N mineralization rates in topsoil were significantly different in growing season (p<0.01). The N contents in root and stem of S. salsa generally decreased, while those in leaf fluctuated significantly. The N/P ratio (9.87±1.23) of S. salsa was less than 14, indicating that the growth of plant was limited by N. The litter production and the N content in litter changed significantly, and the change trends were just the opposite. The mass loss and N content increased at all times during litter decomposition, and the C/N ratio controlled the N dynamics of S. salsa litter. The N accumulated in S. salsa litter at all times, which was ascribed to the N immobilization by microbes from the decomposition environment. The N in the plant subsystem was mainly stored in aboveground living body. Soil organic N was the main N stock of plant-soil system, accounting for 97.35% of the total N stock. The N absorption and utilization coefficients of S. salsa were very low (0.0145 and 0.3844, respectively), while the N cycling coefficient was high (0.7108). The N turnovers among compartments of S. salsa wetland showed that the N uptake amount of aboveground part and root were 7.764 and 4.332g/m2, respectively. The N translocation amounts from aboveground part to root and from root to soil were 3.881 and 0.626g/m2, respectively. The N translocation amount from aboveground living body to litter was 3.883g/m2, the annual N return amount from litter to soil was larger than 0.125(-)g/m2 (minus expressed immobilization), and the net N mineralization amount in topsoil (0-15cm) in growing season was 1.190g/m2. The assessment of N cycling status of S. salsa wetland indicated that the N was a very important limiting factor, and the ecosystem was situated in unstable and vulnerable status. The S. salsa seemed to be well adapted to the low-nutrient status and vulnerable habitat, and the N quantitative relationships in the compartment model might provide some scientific bases for us to reveal the special adaptive strategy of S. salsa to the vulnerable habitat in the following studies.

Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. Chinese Geographical Science, 2012, 22(1): 15-28.
Citation: Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. Chinese Geographical Science, 2012, 22(1): 15-28.

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