《wetland》杂志刊登“河滩湿地中生物硅的热点区”

 
作者：W.Opdekamp,J.Teuchies,D.Vrebos,J.Schoelynck
刊物：《wetland》，2012年，32卷第4期，1115-1124页
关键词：植被；苔属植物；莎草；管理；营养循环
摘要：了解影响湿地硅循环的规模和程度的因素非常重要，因为越来越多的研究发现这些因素与河滩湿地的硅流量之间有强烈的相互作用。一个关键因素是生态系统硅库的大小，这在很大程度上取决于专门参与到硅过程中去的有机体数量的多少。本研究旨在测定草丛（莎草常见的生长形式）是否可以有效地保留生物硅。同样地，草丛利用其硅库的有效循环，为自己提供竞争优势。研究发现湿地草丛的开发引起生物硅的斑块状分布。尽管在人为管理的湿地中（不存在草丛），生物硅均匀分布在地面表层，但是在天然的未受人为影响的湿地中，草丛的发展强烈影响着生物硅的分布。位于草丛表层富含生物硅的土壤与草丛底层生物硅含量较少的土壤镶嵌在一起，这是由于草丛的生长将生物硅从草丛底层的土壤上升到表层土壤所造成的。草丛是富含硅的热点区域并且是靠近河流的生物硅的库，因而对于湿地有重要的作用。这意味着未来的研究应侧重于量化草丛开发、人类管理和大规模的硅储存对湿地发展的影响。

Tussocks: Biogenic Silica Hot-Spots in a Riparian Wetland

Authors: W.Opdekamp,J.Teuchies,D.Vrebos,J.Schoelynck
Journal:wetland,volume32,Number(4)2012, 1115-1124
Keywords:Vegetation ;Carex ;Sedge ;Management ;Nutrient cycling
Abstract: Understanding the factors determining the size and extent of Si cycling in wetlands is important, as more and more research shows they interact strongly within riverine Si fluxes. One key factor is the size of the ecosystem Si reservoir, which strongly depends on the occurrence of organisms specialized in biological Si processing. Our study was aimed to test whether tussocks, a common growth form of sedges, can efficiently retain biogenic silica. As such, they take advantage of efficient recycling of a private Si stock, providing them with a competitive advantage. We showed that tussock development caused a patch-like distribution of biogenic silica (BSi) in wetlands. While in a managed wetland (where tussocks are absent) BSi was uniformly distributed over surface layers, tussock development in an unmanaged wetland strongly interfered with BSi distribution. A mosaic of BSi richer inter-tussock soils and BSi poorer soils under tussocks developed, resulting from the active uplift of Si into the tussock from soil below the tussocks. Tussocks affected the role of wetlands as silica hot-spots and biogenic Si sinks near rivers. This implies that future studies should focus on quantifying the effect of tussock development, and human management, on system scale BSi storage.

原文链接：http://link.springer.com/article/10.1007/s13157-012-0341-5/fulltext.html
翻译：刘金轲；审阅：翟正丽