Nambiar E K, Sands R
CSIRO Division of Forestry, Plantation Forest Research Centre, Mount Gambier, S. Australia 5290, Australia.
Tree Physiol. 1992 Apr;10(3):297-306. doi: 10.1093/treephys/10.3.297.
Effects of subsoil compaction and simulated root channels (perforations) through the compacted layer on root growth, water uptake, foliar nutrient concentration and growth of radiata pine (Pinus radiata D. Don) were studied in a field experiment where a range of treatments were applied in reconstituted soil profiles. Subsoil compaction adversely affected root penetration in deeper parts of the soil and consequently caused greater water stress in trees. However, the effect of compaction was largely overcome when the subsoil was perforated to render 0.2% of the soil volume into vertical channels. Roots showed a remarkable ability to reach the points of low penetration strength and to travel through them to deeper parts of the profile. Perforations through compacted soil layers at a relatively low frequency may be a practical solution to allow root development into deeper parts of the soil and allow greater soil water exploration by roots.
在一项田间试验中，研究了心土压实以及通过压实层设置模拟根系通道（穿孔）对辐射松（Pinus radiata D. Don）根系生长、水分吸收、叶片养分浓度和生长的影响。试验在重构土壤剖面中设置了一系列处理。心土压实对土壤深层根系穿透产生不利影响，进而导致树木水分胁迫加剧。然而，当在心土中打孔使0.2%的土壤体积形成垂直通道时，压实的影响在很大程度上得以克服。根系表现出显著的能力，能够到达低穿透强度点并穿过这些点进入剖面更深层。以相对较低频率穿过压实土层打孔可能是一种切实可行的解决方案，有助于根系向土壤深层发育，并使根系能够更好地探索土壤水分。
