Reforestation challenges on fine-textured soils in boreal forest
Saksa, Timo; Heiskanen, Juha (2017)
Saksa, Timo
Heiskanen, Juha
Sivut
p. 22
2017
Kuvaus
Abstrakti
Tiivistelmä
Mounding is a common soil preparation practice with planting Norway spruce seedlings (Picea abies (L.) Karst.) in Finland. On finegrained soils, however, the postplanting performance of seedlings with mounding has been poorer than on coarser soils.
Effects of different soil preparation treatments on the postplanting performance of Norway spruce container seedlings were examined in two studies. The first study was carried out on till soils susceptible to frost heave and the second on soils ranging from medium-grained tills to sorted clay. In both studies the postplanting performance was measured for three growing seasons.
The results showed that mounding decreased expectedly seedling mortality and increased growth on all studied soil textures. The mounding method or mound height showed no clear difference in seedling growth. Frost heave was present mainly on ditch mounded and inverted spots. The results suggest that ditch or spot mounding should be used on fine-grained soils. Seedling growth and survival were slightly negatively related to the soil clay content; the seedling attributes tended to be poorest on silty soils with a clay content of 20-30% (or silt and fine sand content of over 60%). The results suggest that effective soil preparation cannot fully alleviate all of the inherent disadvantageous effects of silty soils.
Effects of different soil preparation treatments on the postplanting performance of Norway spruce container seedlings were examined in two studies. The first study was carried out on till soils susceptible to frost heave and the second on soils ranging from medium-grained tills to sorted clay. In both studies the postplanting performance was measured for three growing seasons.
The results showed that mounding decreased expectedly seedling mortality and increased growth on all studied soil textures. The mounding method or mound height showed no clear difference in seedling growth. Frost heave was present mainly on ditch mounded and inverted spots. The results suggest that ditch or spot mounding should be used on fine-grained soils. Seedling growth and survival were slightly negatively related to the soil clay content; the seedling attributes tended to be poorest on silty soils with a clay content of 20-30% (or silt and fine sand content of over 60%). The results suggest that effective soil preparation cannot fully alleviate all of the inherent disadvantageous effects of silty soils.
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