Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07 Uppsala, Sweden.
Ambio. 2011 Dec;40(8):857-66. doi: 10.1007/s13280-011-0205-x.
The aim was to describe spatiotemporal patterns of colonization of spruce branches by algae and lichens and the relationship with decreasing deposition of N and S. Coverage was estimated annually over 10 years for four Swedish Integrated Monitoring catchments with varying deposition levels. Initial hypotheses were that algal coverage would be positively correlated with deposition and that lichen coverage would be negatively correlated with S and positively with N deposition. Data were analyzed using regression, ANOVA, and partial least square regression. The results showed a temporal decrease in the coverage of algae but an increase in colonization rates, while lichens showed less uniform patterns. Within catchments, algae and lichen coverages were positively correlated with mainly S deposition. Across catchments, coverage of algae increased, while the coverage of lichens decreased with increasing N and S deposition. Colonization rates of both algae and lichens showed weak correlations with both spatial and temporal trends in N and S deposition. Thus, while N and S deposition had an effect on the colonization and coverage of algae and lichens, other factors are also important.
目的是描述云杉枝条被藻类和地衣定殖的时空模式，以及与 N 和 S 沉积减少的关系。在瑞典四个具有不同沉积水平的综合监测集水区，对藻类和地衣的覆盖范围进行了为期 10 年的年度估算。最初的假设是藻类覆盖范围与沉积量呈正相关，而地衣覆盖范围与 S 呈负相关，与 N 沉积量呈正相关。使用回归、方差分析和偏最小二乘回归对数据进行了分析。结果表明，藻类的覆盖范围随时间减少，但定殖率增加，而地衣的模式则不太均匀。在集水区内，藻类和地衣的覆盖范围与主要的 S 沉积呈正相关。在整个集水区，藻类的覆盖范围增加，而地衣的覆盖范围随着 N 和 S 沉积的增加而减少。藻类和地衣的定殖率与 N 和 S 沉积的空间和时间趋势都有较弱的相关性。因此，尽管 N 和 S 沉积对藻类和地衣的定殖和覆盖有影响，但其他因素也很重要。
