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

SUN Zhigao MOU Xiaojie SUN Jingkuan et al.

SUN Zhigao MOU Xiaojie SUN Jingkuan et al.. Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. 中国地理科学, 2012, 22(1): 15-28.
引用本文: SUN Zhigao MOU Xiaojie SUN Jingkuan et al.. Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. 中国地理科学, 2012, 22(1): 15-28.
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

基金项目: 国家自然科学基金项目;山东省自然科学基金重点项目;中国科学院“优秀博士学位论文、院长奖获得者”科研启动基金项目

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

Funds: National Natural Science Foundation of China
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出版历程
  • 收稿日期:  2010-12-02
  • 修回日期:  2011-04-19
  • 刊出日期:  2012-01-03

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

    基金项目:  国家自然科学基金项目;山东省自然科学基金重点项目;中国科学院“优秀博士学位论文、院长奖获得者”科研启动基金项目

摘要: From April 2008 to November 2009, the nitrogen (N) cycle of plant-soil system in seepweed (Suaeda salsa) wetland in the intertidal zone of the Huanghe (Yellow) River estuary was studied. Results showed that soil N had significant seasonal fluctuations and vertical distribution, and the net N mineralization rates in topsoil were significantly different in growing season (p < 0.01). The N/P ratio (9.87 ± 1.23) of S. salsa was less than 14, indicating that plant growth was limited by N. The N accumulated in S. salsa litter at all times during decomposition, which was ascribed to the N immobilization by microbes from the environment. 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 cycle coefficient was high (0.7108). The results of the N turnovers among compartments of S. salsa wetland showed that the N uptake amount of aboveground part and root were 7.764 g/m2and 4.332 g/m2, respectively. The N translocation amounts from aboveground part to root and from root to soil were 3.881 g/m2 and 0.626 g/m2, respectively. The N translocation amount from aboveground living body to litter was 3.883 g/m2, the annual N return amount from litter to soil was more than 0.125(–) g/m2 (minus represented immobili-zation), and the net N mineralization amount in topsoil (0–15 cm) in growing season was 1.190 g/m2. The assessment of N biological cycle status of S. salsa wetland indicated that N was a very important limiting factor and the ecosystem was situated in unstable and vulnerable status. The S. salsa was seemingly well adapted to the low-nutrient status and vulnerable habitat, and the N quantitative relationships determined in the compartment model might provide scientific base for us to reveal the special adaptive strategy of S. salsa to the vulnerable habitat in the following studies.

English Abstract

SUN Zhigao MOU Xiaojie SUN Jingkuan et al.. Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. 中国地理科学, 2012, 22(1): 15-28.
引用本文: SUN Zhigao MOU Xiaojie SUN Jingkuan et al.. Nitrogen Biological Cycle Characteristics of Seepweed (Suaeda salsa) Wetland in Intertidal Zone of Huanghe (Yellow) River Estuary[J]. 中国地理科学, 2012, 22(1): 15-28.
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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