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Use of humic acid amendment to accelerate the establishment of dune and back-barrier marsh vegetation

机译：使用腐殖酸改良剂加速沙丘和后屏障沼泽植被的建立

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摘要

Major limitations to the successful restoration of coastal dune and back-barrier salt marsh plant communities systems are the often relatively low nutrient and organic matter content of the substrate. An additional complexity of restoration efforts in these systems results from concerns regarding the use of traditional inorganic fertilizers due to the proximity of coastal waters. The use of naturally based products, such as liquid composts and humic acid extracts, as a means of ameliorating marginal soils has been increasing in recent years. The potential growth benefits of humic acid on two dune grasses, Panicum amarum and Uniola paniculata, and two salt marsh species, Spartina alterniflora and Avicennia germinans, were evaluated in greenhouse studies under different environmental stressors. Humic acid amendment stimulated the growth of Panicum amarum and Spartina alterniflora, although no benefit was discernable for Uniola paniculata or Avicennia germinans. No interactions of stressors with humic acid amendments, which might have indicated stress amelioration, were noted. These findings suggest that humic acid amendment could be an effective technique in coastal habitat restoration of targeted species, particularly when the use of inorganic fertilizer is limited. However, further research will be necessary to better resolve amendment levels and to optimize benefits under field conditions.
机译：成功恢复沿海沙丘和后屏障盐沼植物群落系统的主要限制是底物的养分和有机物含量通常相对较低。由于沿海水域的临近，人们对使用传统无机肥料的担忧导致这些系统修复工作的额外复杂性。近年来，使用天然产品（例如液体堆肥和腐殖酸提取物）作为改善边缘土壤的手段的情况正在增加。在温室研究中，在不同的环境胁迫下，评估了腐殖酸对两种沙丘草（Panicum amarum和Uniola paniculata）以及两种盐沼物种（互花米草（Spartina alterniflora）和紫薇）的潜在生长益处。腐殖酸改良剂刺激了紫花Panicum amarum和互花米草Spartina alterniflora的生长，尽管对于Uniola paniculata或Avicennia的细菌没有明显的益处。没有注意到压力源与腐殖酸修饰剂之间的相互作用，这可能表明应力得到了改善。这些发现表明，腐殖酸改良剂可能是恢复目标物种沿海生境的有效技术，特别是在无机肥料的使用受到限制的情况下。但是，有必要进行进一步的研究，以更好地解决修订水平并在现场条件下优化收益。

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