Effects of soil compaction on seedling morphology and growth of chestnut-leaved oak (Quercus castaneifolia C.A.M.) in greenhouse situations
کد مقاله : 1001-GIAN15
نویسندگان:
مقداد جورغلامی *
عضو هیئت علمی گروه جنگلداری-دانشکده منابع طبیعی
چکیده مقاله:
Soil compaction following traffic by heavy timber harvesting machinery usually causes an increase in soil strength that is a stress factor that can negatively affect growth of newly germinated seedlings. This study used a soil strength experiment in a greenhouse to test the hypotheses that increasing soil strength would adversely affect seedling morphology and, alter seedling architecture by changing biomass allocation patterns. We explored the effects of soil compaction in a loam to clay-loam textured soil with optimal conditions of water on a continuous scale (0.2–1.0 MPa penetration resistance) on growth responses of the deciduous Quercus castaneifolia (C.A.M.). Above- and below-ground metrics of seedling size and biomass were negatively affected by soil compaction. At the highest intensity of compaction, size and growth were reduced by 50% compared to controls; negative effects were typically more severe on below-ground (i.e., the length and biomass of the root system) than on above-ground responses. We conclude that growth of roots and heights of Q. castaneifolia seedlings is restricted with any increase in soil strength, but that no evidence for the disruption of a functional equilibrium between above- and below-ground plant portions was found up to soil strengths of 1.0 MPA, at least under optimal water supply.
کلیدواژه ها:
Penetration resistance, Growth, Chestnut-leaved oak, Relative growth rate, seedling morphology
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