UBIPRO, FES Iztacala, UNAM., Los Reyes Iztacala, Tlalnepantla, Edo. de México, México.
Plant Biol (Stuttg). 2012 Jan;14(1):157-62. doi: 10.1111/j.1438-8677.2011.00495.x. Epub 2011 Jul 22.
Information about the effects of biological soil crusts (BSC) on germination, seedling survival and growth of vascular plants is controversial because they can have positive, neutral or negative effects. This controversy may be because most studies conducted until now have just analysed one or two recruitment stages independently. To understand the BSC effects on vascular plants, it is necessary to consider each stage of the recruitment process and synthesise all this information. The goal of this study was twofold. First, we analyse germination, seedling survival and growth of three vascular plants (Agave marmorata, Prosopis laevigata and Neobuxbaumia tetetzo) on BSC (cyanobacteria and mixed crust) from a tropical desert region of south-central México. Second, we synthesise the information to determine the total effect of BSC on plant species performance. We conducted experiments under controlled conditions to evaluate the proportion of germinated seeds, proportion of surviving seedlings and seedling dry weight in BSC and bare soil. Results showed that BSC have different effects on germination, seedling survival and growth of plant species. Plant species performance was qualitatively higher on BSC than bare soil. The highest performance of A. marmorata and P. laevigata was observed on cyanobacteria and mixed crusts, respectively. The highest performance of N. tetetzo was on both crust types.
生物土壤结皮（BSC）对维管植物种子萌发、幼苗存活和生长的影响的信息存在争议，因为它们可能产生积极、中性或消极的影响。这种争议可能是因为到目前为止进行的大多数研究只是独立地分析了一个或两个招募阶段。为了了解 BSC 对维管植物的影响，有必要考虑招募过程的每个阶段，并综合所有这些信息。本研究的目的有两个。首先，我们分析了来自墨西哥中南部热带沙漠地区的三种维管植物（龙舌兰属植物、银胶菊属植物和新比乌斯木属植物）在蓝藻和混合结皮（BSC）上的种子萌发、幼苗存活和生长。其次，我们综合信息以确定 BSC 对植物物种表现的总影响。我们在控制条件下进行实验，以评估在 BSC 和裸土中种子的萌发比例、幼苗的存活比例和幼苗的干重。结果表明，BSC 对植物物种的种子萌发、幼苗存活和生长有不同的影响。与裸土相比，植物物种在 BSC 上的表现定性更高。龙舌兰属植物和银胶菊属植物的表现最好分别在蓝藻和混合结皮上，而新比乌斯木属植物的表现最好在两种结皮类型上。
