Braun Sabine, Cantaluppi Leonardo, Flückiger Walter
Institute for Applied Plant Biology, Sandgrubenstrasse 25/27, 4124 Schönenbuch, Switzerland.
Environ Pollut. 2005 Oct;137(3):574-9. doi: 10.1016/j.envpol.2005.01.042.
Root length of naturally grown young beech trees (Fagus sylvatica L.) was investigated in 26 forest plots of differing base saturation and nitrogen deposition. The relative length of finest roots (<0.25 mm) was found to decrease in soils with low base saturation. A similar reduction of finest roots in plots with high nitrogen deposition was masked by the effect of base saturation. The formation of adventitious roots was enhanced in acidic soils. The analysis of 128 soil profiles for fine roots of all species present in stands of either Fagus sylvatica L., Picea abies [Karst.] L. or both showed a decreased rooting depth in soils with < or =20% base saturation and in hydromorphic soils. For base rich, well drained soils an average rooting depth of 108 cm was found. This decreased by 28 cm on acidic, well drained soils. The results suggest an effect of the current soil acidification in Switzerland and possibly also of nitrogen deposition on the fine root systems of forest trees.
在26个具有不同碱饱和度和氮沉降量的森林地块中，对天然生长的年轻山毛榉树（欧洲山毛榉）的根长进行了调查。结果发现，在碱饱和度低的土壤中，最细根（<0.25毫米）的相对长度会减小。在高氮沉降地块中，最细根的类似减少被碱饱和度的影响所掩盖。在酸性土壤中，不定根的形成会增强。对128个土壤剖面进行分析，这些剖面来自欧洲山毛榉林、欧洲云杉林或二者混交林，结果显示，在碱饱和度≤20%的土壤和潜育土中，根系深度会减小。对于富碱、排水良好的土壤，平均根系深度为108厘米。在酸性、排水良好的土壤中，这一深度减少了28厘米。结果表明，瑞士当前的土壤酸化以及可能的氮沉降对森林树木的细根系统产生了影响。
