Sphagnum regeneration on bare peat surfaces : field and greenhouse experiments
Sphagnum regeneration on bare peat surfaces : field and greenhouse experiments
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裸露泥炭表面的泥炭藓再生：田间和温室实验
DOI：
10.2307/2404988
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发表时间：
1996
影响因子：
5.7
通讯作者：
L. Rochefort
中科院分区：
文献类型：
--
作者：
S. Campeau;L. Rochefort
在裸露的泥炭表面重建泥炭苔藓是收割后泥炭地恢复所面临的主要挑战之一。一种建议的确保苔藓再繁殖的方法是使用从自然地区收集的泥炭草属植物的碎片作为散布孢子。在野外和温室条件下，对不同物种的泥炭泥进行了再生和再繁殖能力的测定。我们研究了一水硬铝石的大小、密度和起源深度如何影响重新殖民和重建的成功。温室试验还测试了水位对泥炭藻更新和再繁殖的影响。野外和实验室实验表明，只有泥炭剖面的表层(0-10厘米)才含有足够的活性物质，可以用作散布孢子的来源。小型(0.5厘米)、中型(1厘米)或大型(2厘米)散布孢子也有类似的重新定植成功。因此，在扩大到修复大表面所需的数量时，获得精确且均匀的碎片大小将不是需要考虑的重要方面。温室试验表明，泥炭柱中的水位对泥炭散生孢子的再定殖率有很大影响。大多数物种对较潮湿的条件都有积极的反应，但青霉是一个明显的例外。在温室试验中，当地下水位接近泥炭表面时，当密度为450株/m2时，泥炭表面的覆盖率在3个月内达到50%，在6个月内达到100%。温室试验旱作处理3个月后，泥炭覆盖率达5-10%，与大田遮荫下生长一季后的结果基本相当。到目前为止，改善提供给散生孢子的湿度条件是减少散生孢子数量的最有希望的方法，这些散生孢子需要在收获后的表面上迅速重建显着的苔藓覆盖。根据待修复表面的干燥程度选择适当的物种和密度是将修复所需的原始材料数量降至最低时需要考虑的另外两个因素。
The re-establishment of Sphagnum mosses on bare peat surfaces is one of the main challenges faced in the restoration of post-harvested peatlands. One suggested approach to ensure moss recolonization is to use fragments of Sphagnum plants collected from a natural area as diaspores. The regeneration and recolonization potential of fragments of different species of Sphagnum were tested on bare peat, both in the field and in a greenhouse. We examined how diaspore size, density and depth of origin influence recolonization and re-establishment success. The greenhouse experiment also tested the impact of water level on Sphagnum regeneration and recolonization. Field and laboratory experiments showed that only the surface layer (0-10 cm) of a peat profile contained enough viable material to be of practical use as a source of diaspores. Small (0.5-cm), medium (1-cm) or large (2-cm) diaspores had similar recolonization success. Obtaining a precise and even size of fragments will not, therefore, be an important aspect to consider when scaling up to the quantities needed for restoring large surfaces. Greenhouse experiments showed that water level in the peat column greatly influences the recolonization success of Sphagnum diaspores. Most species reacted positively to wetter conditions, with the notable exception of S. fuscum. A density of 450 Sphagnum plants per m 2 resulted in some Sphagnum species covering up to 50% of the peat surface in 3 months and 100% in 6 months, when the water table was close to the peat surface in the greenhouse experiment. Sphagnum cover reached 5-10% after 3 mqnths in the drier treatments of the greenhouse experiment and was generally comparable to the results obtained in the field after one season of growth under shade cloth. Improving the humidity conditions offered to diaspores is by far the most promising approach to reduce the quantity of diaspores needed to re-establish a significant moss cover rapidly on a post-harvested surface. The selection of appropriate species and densities according to the dryness of the surface to be restored are two other elements to consider in minimizing the amount of source material needed for restoration.