Effects of Rhizophora mangle, leaf litter and seedlings on carbon and nitrogen cycling in salt marshes potential consequences of climate-induced mangrove migration
Effects of Rhizophora mangle, leaf litter and seedlings on carbon and nitrogen cycling in salt marshes potential consequences of climate-induced mangrove migration
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红树、落叶层和幼苗对盐沼中碳和氮循环的影响气候引起的红树林迁移的潜在后果
DOI：
10.1007/s11104-018-3611-z
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发表时间：
2018
期刊：
影响因子：
4.9
通讯作者：
Dennis F. Whigham
中科院分区：
文献类型：
--
作者：
Hendrikus J. Laanbroek;Qiu-Fang Zhang;Marcio Leite;Jos T. A. Verhoeven;Dennis F. Whigham
背景与目的由于Rhizophora mangle产生大量的单宁和酚类物质，推测全球变暖导致的这一红树林物种在盐沼的入侵将导致碳和氮循环的变化。在美国佛罗里达中部大西洋沿岸的一个以穗花裂腹蛛（Distichlis spicata）为主的盐沼中，将10只雄性小龙虾置于1 m2的试验地中。在所有小区中通过添加含有10 g干D的凋落物袋进行额外的凋落物分解实验。香料垃圾每年测量幼苗生长。一年和四年后开始的实验中，土壤样品收集，以确定物理和化学土壤条件，潜在的硝化和反硝化活性和丰富的基因，是相关的微生物过程中的氮循环。在R. manglitter，而D.穗粒数在R. manglelitter和幼苗。R.而幼苗和/或凋落物对潜在硝化反硝化活性和基因丰度无显著影响。mangleintoD. spicata为主的盐沼将影响碳循环，但不一定影响氮循环，这可能是由于盐沼中预先存在的氮限制条件。
Background and aimsDue to the production of large amounts of tannins and phenolics byRhizophora mangle, it was hypothesized that the invasion of this mangrove species in salt marshes due to global warming will result in changes in the cycling of carbon and nitrogen.MethodsLeaf litter and/or seedlings ofR. manglewere placed into 1-m2experimental plots in aDistichlis spicata-dominated salt marsh on the Atlantic Coast of central Florida (USA). An additional litter decomposition experiment was conducted in all plots by adding litter bags containing 10 g of driedD. spicatashoot litter. Seedling growth was measured yearly. One and four years after the start of the experiment, soil samples were collected to determine physical and chemical soil conditions, potential nitrification and denitrification activities and abundances of genes that are related to microbial processes in the nitrogen cycle.ResultsGrowth ofR. mangleseedlings was stimulated in the presence ofR. manglelitter, while decomposition rates ofD. spicatalitter were lower in plots withR. manglelitter and seedlings. The presence ofR. manglelitter and/or seedlings had no significant effect on potential nitrification and denitrification activities and on the abundances of genes.ConclusionThe colonization ofR. mangleintoD. spicata-dominated salt marshes will affect the carbon cycle, but not necessarily the nitrogen cycle, which is likely due to the pre-existing nitrogen-limited conditions in the salt marsh.