What happens to soil chemical properties after mangrove plants colonize?
What happens to soil chemical properties after mangrove plants colonize?
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DOI：
10.1007/s11104-011-0816-9
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发表时间：
2011-05
期刊：
影响因子：
4.9
通讯作者：
T. Inoue;S. Nohara;Katsumi Matsumoto;Yasuharu Anzai
中科院分区：
文献类型：
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作者：
T. Inoue;S. Nohara;Katsumi Matsumoto;Yasuharu Anzai
了解土壤化学特性对于表征生态系统的基本特性是必要的。在红树林生态系统中，土壤铁、磷、甲烷和氮已在实地条件下得到了充分研究。然而，由于现场数据存在多种因素，很难理解红树林根系功能与土壤化学性质之间的基本关系。本研究的目的是阐明红树林植物定殖后土壤化学性质会发生什么变化。为了研究红树林根对这些土壤特性的影响，在温室中种植了三种具有代表性的红树林物种（白骨壤、红树和木榄），并监测了选定的土壤化学特性，并与未种植的土壤进行了比较。我们检测到所有三个物种的氧化效应，包括根表面氧化铁的沉积、土壤孔隙水中甲烷浓度的降低和氧化无机氮浓度的增加，这表明红树林根部的径向氧损失影响了这些土壤化学性质。除了氧化作用外，A 中土壤孔隙水中的 Fe2+ 浓度也有所增加。所有这三个物种都存在滨海和土壤孔隙水中磷浓度升高的情况，表明红树林根部提供了溶解铁和磷酸盐的底物。最显着的变化是土壤氮素富集。在实验期间，红树林土壤中的氮含量比未殖民土壤增加了四倍。从种植开始六个月起，红树林植物定殖的土壤中的细菌固氮（固氮酶活性）显着高于未定植的土壤，这表明红树林根部刺激了细菌固氮。在这些特性中，磷酸盐动员和土壤氮富集可能对红树林植物的生长特别重要，因为红树林生态系统中的磷酸盐和氮通常是有限的。本研究中观察到的红树林的这种自我支撑能力可能是红树林生态系统高生产力的关键之一。
Understanding soil chemical properties is necessary to characterize the basic properties of ecosystems. In mangrove ecosystems, soil iron, phosphorus, methane and nitrogen have been well studied under field conditions. However, it is difficult to understand fundamental relationships between mangrove root functions and soil chemical properties, because of the multiple factors present in field data. The aim of this study was to clarify what will happen to soil chemical properties after mangrove plant colonize. To examine the effect of mangrove roots on these soil properties, three representative mangrove species (Avicennia marina, Rhizophora stylosa and Bruguiera gymnorrhiza) were cultivated in a greenhouse and selected soil chemical properties were monitored in comparison with those in unplanted soil. We detected oxidative effects in all three species, including deposition of iron oxide on root surfaces, lowered methane concentrations and increased oxidized inorganic nitrogen concentrations in the soil pore-water, suggesting that radial oxygen loss from mangrove roots had affected these soil chemical properties. Besides the oxidative effects, enhanced Fe2+concentrations in the soil pore-water were present inA. marina, and enhanced phosphorus concentrations in the soil pore-water were present in all three species, suggesting that mangrove roots provide Fe- and phosphate-solubilizing substrates. The most remarkable change was in soil nitrogen enrichment. During the experimental period, amounts of nitrogen in the mangrove soils increased four times more than in uncolonized soil. Six months from the start of cultivation, bacterial nitrogen fixation (nitrogenase activity) was significantly higher in soil colonized by mangrove plants than in uncolonized soil, suggesting that mangrove roots stimulated bacterial nitrogen fixation. Among these properties, Phosphate mobilization and soil nitrogen enrichment are likely to be particularly important for the growth of mangrove plants, because phosphate and nitrogen are generally limited in mangrove ecosystems. This self-supporting ability of mangroves observed in this study could be one key to the high productivity of mangrove ecosystems.