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

查看全文 作　　者：SUN [1,2]Zhigao;MOU [2,3,4]Xiaojie;SUN [1]Jingkuan;SONG [2,4]Hongli;YU [1]Xiang;WANG [2,4]Lingling;JIANG [2,4]Huanhuan;SUN [2,4]Wanlong;SUN [2,4]Wenguang 高影响力作者 机构地区：[1]Shandong Key Laboratory for Eco-Environmental Science of Yellow River Delta, Coastal Wetland Ecological Research Base of Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Binzhou 256603, China;[2]Key Laboratory of Coastal Environment Processes of Chinese Academy of Sciences, 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 Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;[4]Graduate University of Chinese Academy of Sciences, Beijing 100049, China高影响力机构 出　　处：《Chinese Geographical Science》索引2012年第22卷第1期,共14页高影响力期刊 基　　金：Under the auspices of Open Research Fund Program of Shandong Key Laboratory for Yellow River Delta Eco-Environmental Science,Binzhou,China (No.2007KFJJ01);Knowledge Innovation Programs of Chinese Academy of Sciences (No.KZCX2-YW-223);National Natural Science Foundation of China (No.40803023,41171424);Key Program of Natural Science Foundation of Shandong Province (No.ZR2010DZ001) 摘　　要：From April 2008 to November 2009,the nitrogen(N) cycle of plantsoil system in seepweed(Suaeda salsa) wetland in the intertidal zone of the Huanghe(Yellow) River estuary was studied.Results showed that soil N had sig-nificant 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 immobilization),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. 关 键 词：土壤有机氮 环境微生物 湿地植物 黄河河口 潮间带 循环特征 碱蓬 珠江口
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